How do I properly install a new toilet?

Installing a toilet is usually a manageable DIY job, but the wax seal, flange, and mounting bolts need to be done correctly to prevent leaks.

What you’ll need

• New toilet with its installation hardware
• New wax ring or manufacturer-approved rubber seal
• New toilet supply line (recommended)
• Adjustable wrench
• Screwdriver
• Putty knife
• Level
• Bucket, towels, and gloves
• Hacksaw or bolt cutters for trimming mounting bolts
• Shims if the floor is uneven

Follow the toilet manufacturer's instructions as the final authority, since some toilets use proprietary seals or mounting systems.

Step-by-step

1. Check the rough-in before installing. Measure from the finished wall to the center of the toilet flange/bolt holes. A common rough-in is 12 inches, but don't assume—verify that your new toilet matches the existing plumbing.
2. Shut off and drain the old toilet. Turn the shutoff valve clockwise, flush, sponge or vacuum out remaining water, and disconnect the supply line. Keep a bucket underneath.
3. Remove the old toilet. Remove the bolt caps and nuts, then gently rock the toilet side-to-side to break the old seal. Lift it straight up and move it aside. Toilets are heavy, so having another person help is a good idea.
4. Clean and inspect the flange. Scrape all old wax away. The flange should be solid and properly secured to the floor. If it's cracked, badly corroded, loose, or significantly below the finished floor, fix that before installing the toilet. A low flange may require an appropriate thicker seal or flange extender.
5. Install the new mounting bolts. Put the T-bolts/closet bolts into the flange slots and orient them according to the toilet's instructions.
6. Install the new wax ring/seal. Use a new seal—never reuse the old one. Depending on the toilet and seal design, it may go on the flange or onto the toilet outlet. If it has a plastic cone, the tapered end generally points down into the flange.
7. Set the toilet. Carefully lower the bowl straight down over the bolts, making sure the outlet is centered over the flange. Press down evenly to compress the seal. Don't rock, lift, or reposition the toilet after the seal has been compressed; doing so can compromise the watertight seal.
8. Secure the toilet. Install the washers and nuts and tighten them alternately, a little at a time. Stop when the toilet is firmly seated and stable. Don't crank them down—overtightening can crack the porcelain.
9. Make it level. Check the bowl with a level. If necessary, use appropriate toilet shims rather than forcing the porcelain down against an uneven floor. Trim exposed shims neatly afterward.
10. Install the tank, if it's a two-piece toilet. Follow the manufacturer's sequence for the tank gasket, bolts, washers, and nuts. Tighten until secure and level, but don't overtighten.
11. Connect the water supply. Attach the supply line to the shutoff valve and toilet. Open the valve slowly and let the tank fill.
12. Test for leaks. Flush several times while inspecting:

• Around the base of the toilet
• Both sides of the flange area
• The supply-line connections
• The tank-to-bowl connection on two-piece toilets

If you see water around the base, don't simply caulk over it—the wax/seal may need to be replaced. 13. Finish the base. If required by your local code and/or recommended by the manufacturer, apply an appropriate bathroom sealant around the base. Leave an intentional opening at the rear if that is your preferred way to make a leak visible, unless your local requirements or manufacturer's instructions specify otherwise.

The three biggest mistakes to avoid

• Reusing the old wax ring — always install a new seal.
• Rocking the toilet after setting it — this can break the seal and cause a hidden leak.
• Overtightening the mounting nuts — porcelain can crack surprisingly easily.

If you're replacing an existing toilet, the job is often straightforward. If the flange is damaged, the floor is rotten, the toilet doesn't match the rough-in, or the drain plumbing needs modification, that's where I'd stop and address the underlying plumbing before setting the new toilet.

Installing a new toilet is a very manageable DIY project if you take it step-by-step. Here is your roadmap to getting it done cleanly and correctly:

Tools & Materials Needed

• New toilet (bowl, tank, seat, and hardware)
• Wax ring (with or without a plastic funnel)
• New closet bolts (T-bolts)
• Adjustable wrench and pliers
• Sponge and bucket (for bailing water)
• Utility knife and rags
• Plumber's putty or silicone caulk
• Level

Step-by-Step Installation

1. Shut off the water
   • Turn the water supply valve clockwise until fully closed. Flush the toilet to drain the tank, then use a sponge and bucket to soak up any remaining water left in the bottom of the tank and bowl.
2. Disconnect the supply line
   • Place a small towel or bucket underneath the supply connection on the bottom of the tank. Unscrew the water supply line from the tank using an adjustable wrench.
3. Remove the old toilet
   • Pry off the bolt caps on each side of the base. Remove the nuts holding the toilet to the floor. Lift the toilet straight up off the floor flange (it can be heavy/awkward—get a helper if needed). Stuff a rag into the open drain hole to block sewer gases while you work.
4. Clean the flange and prep the floor
   • Remove the old wax ring completely from the toilet flange and the bottom of the old toilet using a putty knife. Wipe the area clean. Remove the old T-bolts from the flange slots and slide the new closet bolts into place.
5. Install the new wax ring
   • Remove the rag from the drain pipe. Invert the new toilet bowl and place it upside down on a soft surface (like cardboard). Press the new wax ring firmly around the waste horn on the bottom of the bowl. (Tip: Make sure the tapered/funnel side faces outward from the bowl if it has one).
6. Set the toilet
   • Lift the bowl and carefully lower it straight down, aligning the floor closet bolts so they poke up through the holes in the ceramic base. Press down firmly with your body weight, rocking slightly side-to-side to compress the wax ring. Do not tilt or rock it after it touches down, or you'll break the wax seal.
7. Secure the bowl
   • Place the plastic retainer washers and nuts onto the bolts. Tighten the nuts alternately (a little on the left, a little on the right) with a wrench until snug. Do not overtighten , or you will crack the porcelain. Snap the decorative bolt caps on top. Place a level across the bowl rim to ensure it is even.
8. Assemble the tank to the bowl
   • Place the large rubber tank-to-bowl gasket over the large plastic nut/opening on the underside of the tank. Lower the tank onto the back of the bowl, aligning the rubber washers and metal bolts provided with the tank kit. Tighten the tank bolts evenly until the tank sits level and firm against the bowl.
9. Reconnect water and test
   • Reconnect the water supply line to the tank inlet (hand-tighten, then give a quarter-turn with a wrench—do not over-tighten). Turn the water supply valve back on and let the tank fill. Flush the toilet a few times and check the base and connections for any leaks.
10. Caulk the base
    • Run a neat bead of silicone caulk around the base where it meets the floor. Leave the back portion uncaulked so that if a leak ever develops underneath, you will see it immediately rather than rotting the subfloor. Finally, attach the toilet seat.

If you'd like, let me know:

• Is your existing floor flange made of plastic or metal, and is it level with the floor?
• Do you need help choosing a rough-in size or water supply line?

Installing a new toilet is a straightforward DIY project if you take it step-by-step. Here is a clear guide to getting it done right.

Tools & Materials Needed

• Adjustable wrench and pliers
• Putty knife or scraper
• Level
• Sponge and bucket (for draining water)
• New wax ring (with or without a plastic horn)
• New closet bolts (t-bolts)
• Supply line (recommended to replace with a new one)
• Silicone caulk (optional, for sealing the base)
• Rags and safety glasses

Step-by-Step Installation

1. Shut off the water
   • Turn the water supply valve (located on the wall behind the toilet) clockwise until fully closed.
   • Flush the toilet to drain as much water as possible from the tank and bowl.
2. Remove the old toilet
   • Use a sponge and bucket to soak up any remaining water in the bottom of the tank and bowl.
   • Disconnect the supply line from the bottom of the tank using an adjustable wrench.
   • Pry off the bolt caps on each side of the toilet base and remove the nuts holding the toilet to the floor.
   • Gently rock the toilet side-to-side to break the wax seal, then lift it straight up off the flange. (Pro tip: Stuff a rag into the open drain hole to block sewer gases while you work).
3. Clean the floor flange
   • Scrape away the old wax ring and putty from the brass closet flange using a putty knife.
   • Inspect the flange; if it is cracked or damaged, install a repair ring before proceeding.
   • Remove the old closet bolts from the flange slots and slide the new bolts into place, securing them with the plastic retainers so they stand upright.
4. Install the new wax ring
   • Turn the new toilet bowl upside down on a soft, padded surface (like a piece of cardboard or a towel).
   • Press the new wax ring firmly around the horn (the circular opening at the bottom of the bowl). Do not use old or deformed wax rings.
5. Set the bowl
   • Remove the rag from the floor drain.
   • Lift the toilet bowl straight over the flange, carefully aligning the new floor bolts so they poke up through the holes in the porcelain base.
   • Lower the bowl straight down. Sit or press down firmly with your body weight on the rim of the bowl to compress the wax ring and create a tight seal. Do not rock the toilet back and forth once it touches the wax, or you may break the seal.
   • Place the plastic washers and metal nuts onto the bolts. Tighten the nuts alternately (a little on the left, a little on the right) until snug. Do not overtighten , or you can crack the porcelain base. Snap the bolt caps on.
6. Assemble the tank (if separate)
   • If your tank isn't pre-attached to the bowl, place the large rubber gasket over the flush valve nut on the bottom of the tank.
   • Lower the tank onto the back of the bowl, aligning the rubber washers and nuts. Tighten the tank-to-bowl bolts evenly until the tank sits level and secure against the bowl.
7. Connect the water supply
   • Attach the water supply line to the tank inlet and the shut-off valve. Tighten by hand, then give it a quarter-turn with a wrench. Do not overtighten.
   • Turn the water supply valve back on counter-clockwise. Let the tank fill completely.
8. Test and finish
   • Flush the toilet several times and check the base and connections for any leaks.
   • Place a level across the top of the bowl to ensure it is even (use plastic shims underneath if it wobbles). Trim the closet bolts with a hacksaw if they are too long for the cap.
   • Run a bead of silicone caulk around the base where it meets the floor (leave the back small gap uncaulked so if a leak ever happens, you'll see it immediately rather than rotting the subfloor).

If you'd like, tell me:

• Is your current flange plastic or metal?
• Are you dealing with a one-piece or two-piece toilet?

I can give you specific tips for your exact model.

Installing a toilet is a very manageable DIY job if the existing flange and drain are in good condition. The key is getting the wax/seal ring, flange, and bowl alignment right and avoiding overtightening the porcelain.

What you’ll need

• New toilet with installation hardware
• New wax ring or manufacturer-approved waxless seal
• New flexible toilet supply line
• Adjustable wrench or socket wrench
• Screwdriver
• Putty knife
• Sponge, bucket, and towels
• Hacksaw
• Level
• Toilet shims if the floor isn't perfectly level

Before starting, verify the toilet's rough-in measurement matches your bathroom—typically about 12 inches from the finished wall to the center of the drain, but don't assume.

1. Shut off and remove the old toilet

1. Turn off the shutoff valve.
2. Flush and hold the handle down to drain the tank.
3. Sponge out remaining water from the tank and bowl.
4. Disconnect the supply line.
5. Remove the caps, nuts, and washers from the floor bolts.
6. Carefully rock the toilet side-to-side to break the old seal, then lift it away. Toilets are heavy, so get help if necessary.

Plug the exposed drain temporarily with a rag so sewer gas doesn't come into the room.

2. Inspect the flange

Scrape all of the old wax off the flange and clean the surrounding floor.

The flange should be securely attached to the subfloor and should not move. If it's cracked, badly corroded, or sitting substantially below the finished floor, fix that before installing the toilet. A low flange may require an extra-thick seal or flange extender. Don't stack two wax rings.

Also make sure the new toilet's bolt spacing and rough-in match the existing flange.

3. Install the new seal and bolts

Install the new closet bolts into the flange slots and orient them parallel to the wall.

Then install the new wax ring according to its instructions. Some rings go on the flange; others can be pressed onto the toilet horn. The important thing is that it's centered properly. Never reuse the old wax ring.

4. Set the bowl

Remove the rag from the drain.

Carefully lower the toilet straight down over the two closet bolts. Make sure the bolts pass through the holes in the base.

Once the bowl contacts the wax ring, press straight down evenly to compress the seal. Don't twist or repeatedly lift the toilet afterward—you can compromise the seal.

Check it with a level. If it's rocking, use toilet shims rather than trying to solve the problem by cranking down harder on the bolts.

5. Tighten the bowl

Put the washers and nuts onto the closet bolts.

Tighten them alternately, a little at a time, until the toilet is firmly seated and doesn't rock. Do not overtighten—the porcelain can crack. Trim excess bolt length with a hacksaw and install the decorative caps.

6. Install the tank, if it's a two-piece toilet

Install the large rubber gasket on the bottom of the tank, lower the tank onto the bowl, and install the tank bolts.

Tighten the bolts alternately until the tank is secure and reasonably level. Again, don't overtighten; you're tightening porcelain against porcelain/rubber, not trying to crush the gasket. Manufacturer instructions specifically warn against overtightening these connections.

7. Connect the water

Attach the new flexible supply line to the shutoff valve and toilet fill valve. Hand-tighten the connections first, then snug them with a wrench according to the manufacturer's instructions.

Slowly open the shutoff valve and let the tank fill.

Check every connection for dripping water.

8. Test several flushes

Flush the toilet several times while watching:

• The supply-line connections
• The tank-to-bowl connection
• Around the toilet's base
• The floor immediately around the flange

A leak at the base is particularly important—it can indicate a problem with the seal or flange.

9. Finish the base

Once you're certain there are no leaks and the toilet is stable, follow your local code and the toilet manufacturer's instructions regarding caulking around the base. There is some variation in guidance here: some manufacturers/installers recommend caulking the base, while other installation guidance recommends leaving an opening or not caulking so a future leak can become visible. Follow the instructions supplied with your particular toilet and applicable local code.

The three biggest mistakes to avoid:

1. Setting a toilet on a damaged or loose flange.
2. Moving the toilet after the wax seal has been compressed.
3. Overtightening the floor or tank bolts and cracking the porcelain.

If you're installing a toilet where one wasn't previously installed, rather than simply replacing an existing one, the job is more involved because you'll need to establish the drain, flange, water supply, and correct rough-in. In that situation, I'd recommend treating the flange/drain work as a separate project.

Installing a new toilet is a very manageable DIY project if you take it step-by-step. Here is a clear guide to getting it done right.

Tools and Materials Needed

• New toilet (bowl, tank, seat, and hardware)
• Wax ring (with or without a plastic flange horn)
• Adjustable wrench and pliers
• Screwdrivers (flathead and Phillips)
• New water supply line (recommended)
• Bucket, large sponge, and towels (for cleanup)
• Putty knife or scraper
• Level
• Caulk and caulking gun

Step-by-Step Installation Instructions

1. Prep and Drain
   • Turn off the water supply valve located behind/beside the toilet.
   • Flush the toilet to drain as much water as possible from the tank and bowl.
   • Use a sponge and bucket to remove any remaining water from inside the tank and bowl.
2. Disconnect and Remove the Old Toilet
   • Disconnect the water supply line from the bottom of the tank using an adjustable wrench.
   • Remove the bolt caps on each side of the base of the toilet.
   • Unscrew the nuts holding the toilet to the floor. (If rusted, you may need penetrating oil or a hacksaw).
   • Gently rock the toilet side-to-side to break the seal of the old wax ring, then lift it straight up.
   • Stuff a rag or old towel into the floor drain pipe to block sewer gases while you work.
3. Clean the Flange and Prepare the Area
   • Scrape away the old wax from the toilet flange (the plastic or metal ring on the floor) using a putty knife.
   • Clean the area around the base. Inspect the flange; if it is cracked or damaged, install a repair ring now.
   • Remove the rag from the floor drain.
   • Ensure the two floor bolts are upright and properly seated in the slots of the flange.
4. Install the Wax Ring
   • Turn the new toilet bowl upside down on a soft surface (like a towel or cardboard box).
   • Press the new wax ring firmly around the waste opening (horn) on the bottom of the bowl.
   • Tip: Some DIYers prefer to place the wax ring directly on the floor flange instead, but placing it on the bowl ensures alignment.
5. Set the Toilet Bowl
   • Lift the bowl carefully (get help if needed) and align the floor bolts with the holes in the base of the toilet.
   • Lower the toilet straight down onto the flange without tilting it.
   • Sit or press down firmly with your body weight on the rim of the bowl to compress the wax ring and create a tight seal. Do not rock it side-to-side once it touches the wax.
   • Place a level across the top bowl rim to make sure it is level. If it's rocking or unlevel, use plastic shims underneath before tightening bolts.
6. Secure the Bowl
   • Place the plastic washers and metal nuts onto the floor bolts.
   • Tighten the nuts alternately (a little on the left, a little on the right) with a wrench. Do not overtighten , or you will crack the porcelain.
   • Snap the bolt caps into place.
7. Assemble and Mount the Tank
   • If the tank isn't pre-attached to the bowl, place the large rubber gasket/seal over the flush valve nut on the bottom of the tank.
   • Place the rubber tank-to-bowl washers/bolts inside the tank and lower the tank onto the back of the bowl, aligning the rubber gasket.
   • Hand-tighten the nuts underneath the bowl alternately until the tank sits level and stable against the bowl. Do not overtighten.
8. Connect Water and Test
   • Connect a new water supply line from the wall shut-off valve to the bottom of the tank. Tighten securely (hand-tight plus a quarter turn with a wrench).
   • Turn the water supply valve back on and let the tank fill.
   • Flush the toilet several times to check for leaks at the tank bolts, supply line connection, and the base of the toilet.
9. Install the Seat and Finish
   • Attach the toilet seat to the top of the bowl using the provided hardware.
   • Run a neat bead of silicone caulk around the base of the toilet where it meets the floor. Note: Leave a small 1-inch gap at the very back of the base; this allows you to spot any hidden leaks early rather than trapping water under the floor.

If you'd like, let me know:

• Is your floor tile, wood, or vinyl?
• Are you replacing an old floor flange , or does everything look solid?

I can give you extra tips tailored to your specific setup.

Installing a toilet is usually a manageable DIY job if the existing flange and drain are in good shape. The key is getting the flange, seal, and toilet properly aligned and avoiding movement after the seal is compressed.

What you’ll need

• New toilet
• New wax ring or manufacturer-approved rubber seal
• New closet bolts/hardware
• Adjustable wrench
• Putty knife or scraper
• Screwdriver
• Bucket and towels
• Level
• Hacksaw (to trim bolts)
• Toilet shims if the floor isn't perfectly level
• Gloves

Follow the toilet manufacturer's instructions if they differ from these general steps.

1. Shut off and drain the old toilet

Turn the shutoff valve clockwise. Flush the toilet and hold the handle down to empty the tank. Sponge or towel out remaining water from the tank and bowl.

Disconnect the supply line, remove the nuts from the floor bolts, and carefully lift the toilet straight up. Toilets are heavy, so a second person is helpful.

2. Inspect and clean the flange

Scrape all of the old wax away from the floor flange.

The flange should be solidly attached to the floor and shouldn't be cracked, badly corroded, or moving. If it's damaged—or sits substantially below the finished floor—you may need a flange repair ring, extender, or replacement rather than simply installing the toilet.

If the toilet isn't going on immediately, temporarily cover the open drain to prevent sewer gases from entering the room.

3. Install the new closet bolts and seal

Put the new T-bolts into the flange slots and orient them so they line up with the toilet's mounting holes.

Install a new wax ring—never reuse the old one. Depending on the particular toilet/seal, the ring can be placed on the flange or on the bottom of the toilet. If the flange is below the finished floor, you may need a thicker seal or flange extender.

If your wax ring has a plastic funnel, follow its instructions; Kohler, for example, specifies the tapered end pointing downward into the flange.

4. Set the toilet

This is the most important part.

Carefully lower the toilet straight down over the bolts, aligning the mounting holes. Once it contacts the wax ring, press down evenly until the toilet is fully seated.

Don't rock, lift, or twist the toilet around after it has been set. Movement can compromise the wax seal and cause a hidden leak.

If the toilet rocks because the floor isn't perfectly flat, use toilet shims rather than trying to compensate by excessively tightening the bolts.

5. Tighten the toilet to the floor

Install the washers and nuts on the closet bolts. Tighten them alternately from side to side, gradually.

Don't crank them down hard. The objective is to hold the toilet firmly against the floor—not to compress the porcelain. Over-tightening can crack the bowl. One Kohler installation guide specifies hand-tightening followed by only about a quarter-turn with a wrench, but use your toilet's instructions if they specify otherwise.

Trim excess bolt length with a hacksaw and install the decorative caps.

6. Install the tank, if it's a two-piece toilet

Install the tank-to-bowl gasket and mounting hardware exactly as specified by the manufacturer. Set the tank onto the bowl, make sure it's level, and tighten the tank bolts evenly.

Again, don't overtighten—porcelain can crack.

7. Connect the water supply

Attach the supply line to the toilet's fill valve. Open the shutoff valve slowly and let the tank fill.

Check carefully around:

• The supply connection
• The fill valve
• The tank-to-bowl connection
• Both sides of the toilet base

Flush several times and continue watching for water.

8. Finish the base

If the toilet rocks, correct that with shims before finishing.

Caulking around the base is a little controversial: some manufacturers/plumbing guidance recommends it, while other installation guidance recommends leaving the rear portion uncaulked so a leak can become visible. Follow your local plumbing requirements and the toilet manufacturer's instructions.

The three biggest mistakes to avoid

1. Using the old wax ring — always use a new seal.
2. Installing over a damaged or badly positioned flange — fix the flange first.
3. Rocking the toilet after setting it — this can break the wax seal and cause a leak.

If you're replacing an existing toilet in a typical bathroom, this is generally a straightforward DIY project. If the flange is broken, the floor around it is rotten, the drain needs relocation, or the new toilet doesn't match the existing rough-in, that's where I'd stop and address the underlying plumbing rather than trying to force the installation.

Installing a new toilet is a very manageable DIY project if you take it step-by-step.

To get a clear visual of how all the components align and seal properly, watch this Beginner's Guide to Installing a Toilet on YouTube:

Tools and Materials Needed

• New toilet (bowl, tank, seat, and hardware kit)
• New wax ring (with or without a plastic horn)
• New closet/flange bolts
• Adjustable wrench and pliers
• Putty knife and rags/towels
• Hacksaw (to trim floor bolts if needed)
• Plastic shims (in case the floor is uneven)
• New braided water supply line
• Kitchen and bath silicone caulk

Step-by-Step Installation Instructions

1. Prepare the Flange and Area
   • If replacing an old toilet: Turn off the water supply, flush to empty the tank, sponge out any remaining water, disconnect the supply line, and unbolt/remove the old base.
   • Scrape away the old wax ring from the floor flange using a putty knife.
   • Stuff a clean rag into the open drain hole to block noxious sewer gases while you work.
2. Install New Closet Bolts
   • Remove the rag from the drain.
   • Slide your new brass floor bolts into the slots on the toilet floor flange, positioning them directly parallel to the wall (at the 3 o'clock and 9 o'clock positions). Use the small plastic washers/retainers that come with the bolts to keep them standing straight upright.
3. Position the Wax Ring
   • Place the wax ring either onto the bottom horn of the toilet bowl or directly onto the floor flange (pro tip: warming a traditional wax ring slightly in warm water can make it more pliable).
4. Set the Toilet Bowl
   • Carefully lift the toilet bowl over the flange, aligning the mounting holes in the porcelain base with the upright floor bolts.
   • Lower the toilet straight down. Press down firmly with your body weight to compress the wax ring against the floor. Do not rock or twist the toilet back and forth after it touches the wax, or you may break the seal and risk leaks.
   • Check with a level to ensure it is straight; slide plastic shims underneath if the floor is uneven.
5. Secure the Bowl to the Floor
   • Place the plastic retainer washer, metal washer, and nut onto each bolt.
   • Hand-tighten first , then gently snug them with a wrench, alternating sides to keep pressure even. Do not overtighten, or you will crack the porcelain.
   • Cut off any excess bolt length with a hacksaw and snap on the decorative bolt caps.
6. Assemble and Mount the Tank
   • Attach the large rubber tank-to-bowl gasket onto the bottom drain opening of the tank.
   • Position the tank carefully onto the back of the toilet bowl, aligning the rubber washers and wing nuts underneath.
   • Tighten the tank bolts evenly (alternate back and forth) until the tank is snug and level, watching out not to over-torque.
7. Connect the Water and Test
   • Screw the new flexible water supply line to the bottom of the tank (finger-tight plus a quarter-turn with a wrench) and to the wall shut-off valve.
   • Turn the water supply back on slowly and let the tank fill.
   • Flush the toilet several times and thoroughly check underneath and around the base for any signs of leaks.
8. Caulk the Base
   • Run a bead of kitchen and bath silicone around the base where the porcelain meets the floor for stability and sanitary reasons. Tip: Leave a small 2 inch gap uncaulked at the very back of the toilet so that if a wax seal ever fails in the future, water will leak out visibly rather than pooling silently under the floorboards.

If you'd like, let me know:

• Is your floor tile or wood?
• Are you working with an old iron flange or a new PVC flange?

I can give you specialized tips for dealing with your specific setup.

Installing a toilet is a manageable DIY job if the existing drain flange and shutoff valve are in good condition. The exact toilet manual should take priority, since mounting hardware and seals vary by model.

What you'll need

• New toilet and seat
• New wax ring or manufacturer-specified rubber seal
• Closet bolts, washers, and nuts
• Adjustable wrench
• Screwdriver
• Putty knife
• Bucket, towels, gloves
• Water-supply line if the old one is being replaced
• Level and possibly toilet shims
• Hacksaw, if you need to trim the mounting bolts
• Optional bathroom-grade silicone caulk

Step-by-step

1. Shut off the water.
   Close the shutoff valve, flush the old toilet, and sponge or vacuum out remaining water. Disconnect the supply line.

2. Remove the old toilet.
   Remove the bolt caps and nuts, then carefully lift the toilet straight up. Scrape all old wax from the floor flange.

3. Inspect the flange and floor.
   The flange should be solid, properly attached, and free of cracks. Also check that the floor around it isn't rotten or damaged. A damaged flange or subfloor should be repaired before installing the toilet.

4. Install the new closet bolts.
   Slide the bolts into the flange slots and orient them so they line up with the holes in the toilet base.

5. Install the new wax ring.
   Center it over the flange. If your particular ring has a plastic cone/horn, follow its instructions—the orientation can matter.

6. Set the toilet.
   With another person helping if necessary, lower the toilet straight down over the bolts and wax ring. Make sure the bolts pass through the mounting holes. Press down firmly and evenly to compress the seal. Don't slide or rotate the toilet after it contacts the wax ring, because that can compromise the seal.

7. Secure it.
   Install washers and nuts on the closet bolts. Tighten each side gradually and evenly until the toilet is firmly seated. Do not overtighten—porcelain can crack. If the toilet rocks, use appropriate toilet shims rather than trying to solve the problem by cranking down harder on the bolts.

8. Install the tank if it's a two-piece toilet.
   Install the tank gasket and bolts according to the toilet's instructions, then tighten the tank evenly until it's secure and level.

9. Connect the water supply.
   Attach the supply line to the toilet's fill valve and shutoff valve. Use the supplied rubber washer/gasket where specified; don't substitute random washers or omit the sealing components.

10. Turn the water on slowly.
    Let the tank fill, then flush several times. Carefully inspect:

    • the supply-line connections
    • the tank-to-bowl connection
    • around the toilet's base

    Any leak at the base generally means the toilet needs to be removed and the wax/seal replaced rather than simply tightened.

11. Install the seat and finish the base.
    Install the seat according to its instructions. You can apply a thin bead of bathroom-grade silicone around the base if appropriate for your installation. Leave the specified curing time before putting significant load on the caulk.

Three big mistakes to avoid

• Reusing the old wax ring — always use a fresh seal.
• Overtightening the toilet bolts — you can crack the porcelain.
• Ignoring a bad flange or rotten floor — a new toilet won't fix an unstable or leaking foundation.

If you're replacing an existing toilet with a standard floor-mounted toilet, I can also give you a very detailed beginner's procedure, including exactly what to check before you buy the new toilet and how to tell whether your flange is the right height.

Installing a new toilet is a manageable DIY project if the floor, flange, and water connection are already in good shape. The most important part is getting a solid seal at the toilet flange and avoiding a rocking bowl.

Tools and materials

• New toilet (bowl, tank, seat)
• New wax ring or approved rubber seal
• New closet bolts (recommended)
• Adjustable wrench
• Screwdriver
• Putty knife
• Level
• Bucket and towels
• Hacksaw (for trimming bolts)
• Shims if the floor is uneven
• Gloves

Step-by-step installation

1. Prepare the area

1. Shut off the toilet’s water supply.
2. Flush the old toilet and remove remaining water.
3. Disconnect the supply line.
4. Remove the old toilet and scrape away the old wax ring.
5. Inspect the flange:
   • It should be firmly attached to the floor.
   • It should not be cracked or badly damaged.
   • The finished flange position should allow the toilet to seal properly.

2. Install the closet bolts

• Slide the toilet bolts into the flange slots.
• Position them so they line up with the toilet’s mounting holes.
• Keep them upright while you set the bowl.

3. Install the wax ring

• Use a new wax ring (never reuse an old one).
• Center it on the flange or according to the toilet manufacturer’s instructions.
• Make sure the toilet outlet will land squarely on the seal.

4. Set the toilet bowl

1. Carefully lower the bowl straight down over the bolts.
2. Press down firmly so the wax compresses and the base contacts the floor.
3. Check that the toilet is level.
4. If it rocks, add toilet shims—do not rely on tightening the bolts to force it level.

5. Secure the bowl

• Install washers and nuts on the bolts.
• Tighten gradually, alternating sides.
• Stop when the toilet is secure; overtightening can crack porcelain.
• Trim excess bolt length and install caps.

6. Install the tank (if separate)

• Attach the tank gasket and mounting hardware.
• Tighten evenly so the tank is stable but not stressed.
• Connect the flush handle and internal parts if not preassembled.

7. Connect the water supply

• Attach the supply line to the fill valve.
• Turn the water on slowly.
• Check for leaks around:
  • Supply connection
  • Tank bolts
  • Toilet base

8. Finish the installation

• Install the toilet seat.
• Apply a small bead of bathroom-grade caulk around the base if required or desired (many installers leave a small gap at the back so leaks can be noticed). Follow your local code and manufacturer instructions.

Common mistakes to avoid

• ❌ Reusing the old wax ring
• ❌ Installing over a loose or damaged flange
• ❌ Tightening bolts too much and cracking the toilet
• ❌ Ignoring a rocking toilet
• ❌ Using the wrong wax ring thickness for a flange that sits too low

If you tell me whether you’re replacing an existing toilet or installing one in a new location, and whether the flange is PVC, cast iron, or unknown, I can tailor the steps.

Installing a new toilet is a very manageable DIY project if you take it step-by-step. If you are replacing an old unit, make sure to check your rough-in measurement (the distance from the finished wall to the center of the floor drain bolts) to ensure your new toilet fits—standard is 12 inches.

Watch this step-by-step tutorial from The Home Depot to see the physical process of unbolting, sealing, and setting a new toilet safely:

8:32 How to Replace or Install a Toilet | Bathroom Renovation | The ...208K views  · 8 years ago YouTube · The Home Depot

Tools and Materials Needed

• New toilet (bowl, tank, and matching seat)
• New wax ring (with or without a plastic horn)
• New closet bolts (floor anchoring bolts)
• Adjustable wrench and pliers
• Sponge, bucket, and old towels
• Utility knife
• Putty knife
• Plastic shims (for leveling)
• New water supply line (recommended)

Step-by-Step Installation

1. Shut Off the Water and Drain
   • Turn off the water supply valve located behind/beside the toilet.
   • Flush the toilet and hold the handle down to empty as much water as possible from the tank.
   • Use a sponge and bucket to soak up whatever standing water remains in the bottom of the tank and the bowl.
2. Disconnect and Remove the Old Toilet (If Replacing)
   • Disconnect the water supply line from the tank and the shut-off valve.
   • Pry off the decorative bolt caps at the base of the toilet and use a wrench to remove the nuts. (If rusted tight, use a penetrating oil or a small hacksaw to cut the bolts).
   • Score any caulk line at the base with a utility knife, gently rock the bowl to break the seal, and lift it straight up.
   • Crucial safety step: Stuff a rag or old towel into the open floor drain hole to block harmful sewer gases and prevent tools from falling in.
3. Prep the Flange and Floor
   • Remove the rag from the drain hole.
   • Use a putty knife to thoroughly scrape away the old wax ring and residue from the toilet flange. The surface must be completely clean.
   • Insert your new T-shaped closet bolts into the slots on the floor flange, sliding them into position so they face straight up.
4. Install the Wax Ring
   • Flip the new toilet bowl upside down on a soft surface (like cardboard or a towel).
   • Firmly press the new wax ring onto the discharge opening at the bottom of the bowl. Do not stack or use two wax rings; use an extra-thick ring if your flange sits low relative to the finished floor.
5. Set the Bowl
   • Remove the protective rag from the floor drain one last time.
   • Carefully lift the bowl and align its mounting holes with the floor bolts sticking up from the flange.
   • Lower the toilet straight down onto the flange. Sit or press down gently with your body weight, giving it a slight rock to compress the wax ring and create a tight seal.
   • Check with a small level across the bowl. If it rocks or is uneven, slide plastic shims underneath the ceramic base until it is stable.
   • Place the plastic washers, metal washers, and nuts onto the floor bolts. Tighten alternately and evenly from side to side. Do not overtighten, or you risk cracking the porcelain. Snap on the bolt caps.
6. Assemble and Mount the Tank
   • If the tank isn’t pre-assembled, attach the large rubber tank-to-bowl gasket/seal onto the bottom flush valve opening.
   • Insert the tank mounting bolts and rubber washers from inside the tank.
   • Carefully lower the tank onto the back of the bowl, aligning the bolts with the corresponding holes.
   • Secure the tank using the washers and wing nuts/nuts provided. Tighten them alternately, checking that the tank sits level and touches the bowl evenly without wobbling. Do not overtighten.
7. Connect Water and Test
   • Attach a new braided stainless steel water supply line from the wall shut-off valve to the toilet fill valve connection. Hand-tighten, then give it a slight turn with a wrench (do not over-torque).
   • Slowly turn the water supply valve back on and let the tank fill completely.
   • Flush the toilet 4 to 5 times. Inspect the base and tank-to-bowl connection closely for any signs of water seepage.
8. Finishing Touches
   • Install the toilet seat onto the back of the bowl following the manufacturer's manual.
   • Optional: Run a neat bead of silicone caulk around the base of the toilet to secure it to the floor. Tip: Leave a small 2-inch gap uncaulked at the very back of the base so that if a wax ring ever fails in the future, you will notice the leak immediately rather than trapping water under the flooring.

If you'd like, let me know:

• Is your floor tile, wood, or vinyl?
• Is the distance from your wall to the bolts a standard 12 inches , or something else?

I can give you extra tips on dealing with uneven floors or unconventional plumbing setups.