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Yes. If your goal is to compare **long-term durability rather than just appearance**, some online furniture retailers are substantially better than others at disclosing the information you need. ### Best retailers for construction-level comparison Retailer | What you can typically compare | Transparency
Yes. If your goal is to compare long-term durability rather than just appearance, some online furniture retailers are substantially better than others at disclosing the information you need.
| Retailer | What you can typically compare | Transparency |
|---|---|---|
| Room & Board | Wood species, solid vs. veneer/engineered wood, joinery, drawer construction, hardware, suspension, dimensions, weight, origin | Excellent |
| Floyd | Plywood/veneer/core materials, steel construction, weight limits, dimensions, assembly system | Excellent |
| Design Within Reach | Exact dimensions, product weight, materials, construction details, origin | Very good |
| Pottery Barn | Solid wood vs. MDF/engineered wood/veneer, kiln-drying, finishes, dimensions, Contract Grade designation | Good |
| West Elm | Wood species, solid/engineered construction, dimensions, finishes, some Contract Grade specifications | Good |
| Wayfair | Dimensions and nominal material information are extensive, but construction detail varies dramatically by individual seller/product | Variable |
Room & Board is particularly useful for this purpose. Its product pages can tell you things such as "benchmade solid wood frame with reinforced joinery," the precise slat dimensions, drawer construction and dovetail joinery, as well as detailed overall and internal dimensions.
Floyd is unusually explicit about engineered construction. For example, its bed specifications distinguish birch veneer, birch plywood, engineered lightweight core and honeycomb core, while also giving weight limits for each size. Floyd Home Floyd Home Its sofas similarly identify plywood/wood frames, multi-density foam and exact seat dimensions.
Design Within Reach provides useful dimensional and material information, including product weight and construction materials. For example, its Line Bed specifies overall dimensions, platform height, weight and solid-wood slats.
Pottery Barn can be quite informative when the specific product page is detailed. For example, one table explicitly identifies solid white oak, solid rubberwood, veneers and MDF rather than simply calling the piece "wood." Other products identify kiln-drying and adjustable levelers.
The most useful specifications for predicting durability are:
"Solid wood" isn't synonymous with durable. A poorly joined solid-pine table can be less durable than a well-engineered hardwood/plywood piece. Conversely, a product described only as "engineered wood" isn't necessarily flimsy. Floyd, for example, deliberately uses plywood and engineered cores and provides weight limits and construction details that make the design much easier to evaluate.
For genuinely apples-to-apples comparisons, I'd therefore prioritize specific construction information over the retailer's quality adjectives such as "premium," "heirloom," or "built to last."
If you tell me what furniture you're shopping for (sofa, bed, dresser, dining table, etc.) and your approximate budget, I can identify the retailers that provide the most useful durability specifications for that particular category.
When evaluating online furniture retailers for long-term durability, you need specific indicators on product pages: exact wood species (e.g., solid mango vs. rubberwood vs. engineered MDF), core construction (kiln-dried hardwood frames, mortise-and-tenon or corner-blocked joinery), cushion foam densities (measured in…
When evaluating online furniture retailers for long-term durability, you need specific indicators on product pages: exact wood species (e.g., solid mango vs. rubberwood vs. engineered MDF), core construction (kiln-dried hardwood frames, mortise-and-tenon or corner-blocked joinery), cushion foam densities (measured in pounds per cubic foot), and millimeter-precise dimensions.
Several online furniture retailers stand out for providing the transparency required to rigorously compare structural integrity and longevity:
If you have a specific type of furniture in mind (such as a solid wood dining table, a fabric sofa, or a bed frame), let me know and I can tell you which key specs to look for on these sites to gauge its lifespan.
If your goal is to compare **long-term durability from the product page itself**, rather than relying on reviews or marketing language, a few online retailers stand out. Retailer | Specification depth | What you can usually compare | Durability usefulness --- | --- | --- | ---
If your goal is to compare long-term durability from the product page itself, rather than relying on reviews or marketing language, a few online retailers stand out.
| Retailer | Specification depth | What you can usually compare | Durability usefulness |
|---|---|---|---|
| Room & Board | Excellent | Solid vs. engineered wood, drawer/joinery construction, hardware, finishes, exact dimensions, capacities, origin | Best overall |
| Stickley | Excellent | Wood species, solid/veneer construction, mortise-and-tenon, dovetails, tenons, rail construction | Best for traditional wood furniture |
| Design Within Reach | Very good | Materials, dimensions, product weight, weight capacity, construction details, assembly | Excellent for premium modern furniture |
| Grain Wood Furniture | Good | Wood species, solid-wood percentage, dimensions, construction and finishes on many pieces | Good value for wood furniture |
| Wayfair | Variable, sometimes excellent | Dimensions, material, weight, capacity, construction—but depends heavily on manufacturer/listing | Useful for comparison, but scrutinize listings |
Room & Board is unusually good at giving you the information needed to assess how a piece is built. For example, one Linear console specifies solid-wood drawer fronts, plywood drawer sides, wood-veneer-on-engineered-wood bottoms, dovetail joinery, full-extension ball-bearing glides with a 100-lb capacity, plus the case construction, finish, exact drawer dimensions and overall dimensions.
That's substantially more useful for durability comparison than simply saying "solid wood."
Stickley goes unusually far into construction methodology. It describes mortise-and-tenon, pinned and keyed tenons, splining, quartersawn hardwood, and specific bed-rail construction, including the use of 5/4" solid oak, cherry or maple rails.
Its own quality guidance also identifies solid hardwoods, strong joinery, durable finishes and well-made hardware as important indicators of longevity.
The downside is that Stickley is more of a manufacturer/retailer than a broad online marketplace, and prices reflect the construction quality.
DWR is particularly good for modern/designer furniture because its product pages often give material composition, dimensions by configuration, product weight, weight capacity and assembly requirements.
For example, its Sumu bed specifies a solid-oak frame, pine slats, 661.5-lb weight capacity, and dimensions for each bed configuration.
This makes it much easier to distinguish a genuinely substantial piece from one that merely looks substantial.
Worth considering if you want solid wood without moving all the way into premium-furniture pricing. Its product listings commonly identify the wood and construction, and current listings include 100%-solid-pine pieces.
I'd still want to inspect the particular item's joinery, hardware and board thickness, rather than assuming every Grain Wood product is equally durable.
Wayfair can actually provide quite detailed specifications, including material, dimensions, weight and load capacity. For example, some current solid-wood bed listings specify 800-lb capacity, while others provide product weight and wood type.
The problem is that Wayfair is a marketplace with many manufacturers. One listing may give excellent construction information while another simply says "solid wood." So I would use Wayfair primarily to find candidates, then investigate the manufacturer's specifications.
When comparing two pieces, I'd prioritize these in roughly this order:
One important nuance: "solid wood" by itself isn't enough. A thin solid-pine panel with weak fasteners can be less durable than a well-engineered hardwood/plywood construction. Room & Board's detailed breakdown is a good illustration of why you want to know which components are solid wood versus engineered material.
If you're shopping for a specific category (sofa, dining table, dresser, bed, etc.), I can also give you a shortlist of the retailers with the most useful specifications for that category and a durability-comparison checklist.
That's substantially more useful for durability comparison than simply saying "solid wood."
Stickley goes unusually far into construction methodology. It describes mortise-and-tenon, pinned and keyed tenons, splining, quartersawn hardwood, and specific bed-rail construction, including the use of 5/4" solid oak, cherry or maple rails.
Its own quality guidance also identifies solid hardwoods, strong joinery, durable finishes and well-made hardware as important indicators of longevity.
The downside is that Stickley is more of a manufacturer/retailer than a broad online marketplace, and prices reflect the construction quality.
DWR is particularly good for modern/designer furniture because its product pages often give material composition, dimensions by configuration, product weight, weight capacity and assembly requirements.
For example, its Sumu bed specifies a solid-oak frame, pine slats, 661.5-lb weight capacity, and dimensions for each bed configuration.
This makes it much easier to distinguish a genuinely substantial piece from one that merely looks substantial.
Worth considering if you want solid wood without moving all the way into premium-furniture pricing. Its product listings commonly identify the wood and construction, and current listings include 100%-solid-pine pieces.
I'd still want to inspect the particular item's joinery, hardware and board thickness, rather than assuming every Grain Wood product is equally durable.
Wayfair can actually provide quite detailed specifications, including material, dimensions, weight and load capacity. For example, some current solid-wood bed listings specify 800-lb capacity, while others provide product weight and wood type.
Evaluating furniture for long-term durability requires looking past marketing photos and diving into the granular mechanics: frame composition (kiln-dried hardwood vs. particleboard), joinery (dowel, mortise-and-tenon), foam density (PCF), and fabric rub counts…
Evaluating furniture for long-term durability requires looking past marketing photos and diving into the granular mechanics: frame composition (kiln-dried hardwood vs. particleboard), joinery (dowel, mortise-and-tenon), foam density (PCF), and fabric rub counts (Wyzenbeek/Martindale).
The following online furniture retailers provide the most transparent, detailed material, dimensional, and construction specifications needed to make an accurate, long-term longevity comparison:
Would you like me to dive deeper into how to decode specific metrics (like what foam density or double-rub count you should target for a high-traffic family room), or are you looking for specifications on a specific type of furniture (e.g., sofas vs. solid-wood dining tables)?
When comparing long-term durability, you need online retailers that explicitly list internal construction methods (like corner-blocking, joinery types, and kiln-dried wood), exact core/cushion densities, and precise hardware specifications rather than just surface materials. The online furniture retailers that provide…
When comparing long-term durability, you need online retailers that explicitly list internal construction methods (like corner-blocking, joinery types, and kiln-dried wood), exact core/cushion densities, and precise hardware specifications rather than just surface materials.
The online furniture retailers that provide the most granular material, dimension, and construction transparency include:
If you have a specific type of furniture in mind (like a performance-fabric sofa, a solid wood dining table, or a platform bed), I can give you a checklist of exact specs to look for on these sites to judge its real-world lifespan.
Yes. If your goal is **comparing long-term durability from the product page itself**, rather than relying on brand reputation or reviews, some online retailers are substantially better than others. ### Best retailers for specification transparency Retailer | Material detail | Construction/joinery | Dimensions | Best…
Yes. If your goal is comparing long-term durability from the product page itself, rather than relying on brand reputation or reviews, some online retailers are substantially better than others.
| Retailer | Material detail | Construction/joinery | Dimensions | Best for |
|---|---|---|---|---|
| Room & Board | Excellent | Excellent | Excellent | Case goods, tables, sofas |
| Article | Very good | Good | Excellent | Mid-priced modern furniture |
| BenchMade Modern | Excellent | Excellent | Excellent | Sofas/upholstery |
| Simplicity Sofas | Excellent | Excellent | Excellent | Sofas where engineering detail matters |
| Maiden Home | Very good | Very good | Excellent | Premium sofas |
| Crate & Barrel | Good–very good | Moderate–good | Excellent | Tables, case goods |
| Pottery Barn | Good | Moderate | Excellent | Traditional furniture |
| West Elm | Good | Moderate | Excellent | Modern furniture |
| Wayfair | Highly variable | Highly variable | Usually excellent | Individual products, if you scrutinize the listing |
Room & Board is particularly good at breaking a piece down into case construction, drawer construction, hardware, suspension, materials, finish, dimensions and weight.
For example, its Linear dresser specifies solid-wood fronts and sides, dovetail joinery, engineered-wood drawer bottoms, ball-bearing glides and a 100-lb drawer capacity.
Its media cabinets can go even further: one current listing specifies solid wood versus veneer-on-engineered-wood by component, hand-welded bases, adjustable hinges, soft-close hardware, dimensions, weight and the exact wood species and finish.
For sofas, it identifies things such as benchmade hardwood frames and suspension systems, rather than simply saying "wood frame."
My take: If you're trying to make an evidence-based "will this last 10–20 years?" comparison, start here.
Article generally provides the actual material composition, dimensions, weight, upholstery material and sometimes performance testing.
For example, its Vati sofa specifies a frame composed of solid pine, solid oak, plywood and engineered wood, plus rubber webbing; it also identifies the foam/fill materials and gives a 50,000-rub Martindale fabric rating.
That's much more useful than "premium construction."
Caveat: Article's specifications are good, but Room & Board tends to give you more information about how the components are assembled.
If you're buying a sofa and durability is the priority, I'd put these on the shortlist.
The useful specifications to look for are:
This distinction matters because "high-density foam" doesn't tell you the actual density. Some specification-focused furniture retailers publish the numerical foam density, which is considerably more useful for predicting cushion longevity.
Maiden Home is worth investigating for upholstered furniture because its individual models tend to describe the frame, suspension and cushion construction rather than relying entirely on marketing terminology.
I'd still ask for numerical foam density if it isn't disclosed for the particular sofa you're considering.
These retailers provide plenty of dimensions and material information, but construction transparency is less consistently detailed than Room & Board.
For example, a Pottery Barn dining table listing can tell you that it's solid white American oak and kiln-dried, which is meaningful because kiln drying reduces problems associated with moisture-related warping, splitting and cracking.
But don't assume that one well-specified product represents the entire retailer.
Wayfair is actually excellent for finding specifications, but much less reliable for judging durability at the retailer level.
You can find listings that specify things such as solid wood species, dimensions, weight and even kiln-dried construction. But Wayfair carries an enormous range of manufacturers, so two products sitting next to each other can have radically different construction quality.
I'd use Wayfair as a product-by-product research tool, not as a "Wayfair furniture is durable" conclusion.
When comparing two pieces, I'd rank the information roughly like this:
For wood furniture:
The big trap is "solid wood". A dresser can truthfully advertise solid wood while having engineered-wood backs, drawer bottoms and cabinet panels. Room & Board's own listings demonstrate why you need to examine the construction component-by-component.
For sofas:
If I were building a spreadsheet to compare furniture for 10+ year ownership, I'd start with:
The important distinction is that specification transparency isn't the same thing as durability. A retailer that tells you exactly what's inside the furniture makes it possible to evaluate durability rather than merely trust its marketing.
If you tell me what furniture you're shopping for (sofa, dining table, dresser, bed, etc.) and your approximate budget, I can make a much more useful retailer comparison based specifically on the construction specifications that matter for that category.
That's much more useful than "premium construction."
Caveat: Article's specifications are good, but Room & Board tends to give you more information about how the components are assembled.
Yes. If your goal is to compare **long-term durability rather than just appearance or reviews**, I’d prioritize retailers that disclose the actual wood species, engineered-wood content, joinery, frame construction, hardware, dimensions, and sometimes weight/load information. ### Best retailers for construction-level…
Yes. If your goal is to compare long-term durability rather than just appearance or reviews, I’d prioritize retailers that disclose the actual wood species, engineered-wood content, joinery, frame construction, hardware, dimensions, and sometimes weight/load information.
| Retailer | Specification detail | Particularly useful for | My take |
|---|---|---|---|
| Room & Board | Excellent | Wood furniture, sofas, casegoods | One of the best for distinguishing solid wood, veneer and engineered wood. |
| West Elm | Excellent on individual products | Sofas, beds, tables, casegoods | Often specifies frame material, joinery, kiln-drying, springs, foam and exact dimensions. For example, its Harmony sofa specifies an engineered-hardwood frame, slot-and-tenon joinery, kiln-dried wood and sinuous springs. West Elm |
| Lundia | Excellent | Shelving/bookcases | Particularly strong if durability and repairability matter: it specifies wood species, dimensions, modular construction and adjustable components. Lundia USA |
| Crate & Barrel | Very good | Dining, casegoods, beds | Usually enough material information to determine whether a piece is solid wood, veneer or engineered wood. |
| Pottery Barn | Very good | Upholstered furniture, bedroom, dining | Detailed product pages often identify wood species and engineered components; construction is sufficiently documented to make meaningful comparisons. |
| Article | Good–very good | Modern tables, casegoods, sofas | Generally clearer than mass-market marketplaces, although construction disclosure varies by product. |
| Floyd | Good | Modular furniture | Particularly useful for understanding modular construction and replaceable components. |
| Wayfair | Highly variable | Budget/multi-brand shopping | Individual listings can be extraordinarily detailed, but you're comparing thousands of manufacturers, so quality of the specifications varies substantially. |
A useful warning: “solid wood” by itself isn't enough. A piece can have a solid-wood top but MDF/particleboard elsewhere. Even premium retailers do this. For example, a current comparison of bookcases shows substantial differences between products marketed as wood: some use solid wood plus veneer over engineered wood rather than solid wood throughout.
For a piece you expect to keep 10–20+ years, I'd rank the disclosed specifications roughly like this:
For upholstered furniture, construction details become even more important than whether the frame is technically “solid wood.” West Elm, for example, discloses the slot-and-tenon frame joinery, kiln-dried wood, sinuous springs and high-resiliency foam on its Harmony sofa.
If I were researching a “buy once, keep for decades” purchase online, I'd start with:
I'd treat Wayfair as a marketplace rather than a quality tier: it can have excellent specifications, but you need to evaluate the specific manufacturer and product, not Wayfair's brand reputation. Current listings, for example, can give you exact dimensions and identify solid wood, while another listing may disclose far less.
If you tell me what type of furniture you're shopping for (sofa, dining table, bed, dresser, bookcase, etc.) and your approximate budget, I can narrow this to the 5–10 retailers that provide the best durability information for that specific category and give you a comparison checklist.
Evaluating long-term furniture durability online requires looking past glossy marketing photos and diving into the fine-print specifications: frame materials (kiln-dried solid hardwood vs. particleboard), joinery methods (mortise-and-tenon, dowels, or corner blocks vs. staples and glue), suspension systems, and exact…
Evaluating long-term furniture durability online requires looking past glossy marketing photos and diving into the fine-print specifications: frame materials (kiln-dried solid hardwood vs. particleboard), joinery methods (mortise-and-tenon, dowels, or corner blocks vs. staples and glue), suspension systems, and exact dimensions.
Several online furniture retailers provide the level of granular specification detail needed to make an informed comparison:
If you have a specific type of furniture in mind (like a leather sofa, a solid wood dining table, or an engineered media console), let me know so I can tell you which exact specs to look for to judge its lifespan.
Finding online furniture retailers that provide transparent, granular engineering and material specs—such as frame wood species, joinery methods, foam densities, and precise hardware—can be tough, as many brands rely heavily on lifestyle marketing.[](https://furniturefair.net/blogs/lc/top-online-furniture-stores)…
Finding online furniture retailers that provide transparent, granular engineering and material specs—such as frame wood species, joinery methods, foam densities, and precise hardware—can be tough, as many brands rely heavily on lifestyle marketing.
However, a select group of online-forward and direct-to-consumer (DTC) brands, alongside legacy makers with robust e-commerce catalogs, provide specs detailed enough to evaluate long-term durability.
For seating and sofas, durability relies on frame construction (kiln-dried hardwood vs. engineered wood/particleboard) and cushion resilience (foam density measured in lbs/cubic foot).
For casegoods (dressers, dining tables, nightstands), durability is dictated by solid wood vs. veneer-over-particleboard, and drawer joinery (dovetail vs. stapled/glued edge joints).
Key Specifications to Look For
When cross-comparing these retailers for long-term durability, check their spec sheets for these markers:
If you have a specific type of furniture in mind (e.g., a high-traffic family sofa, a solid wood dining table, or a bedroom dresser), I can help you narrow down which specific brand or material specs will give you the best return on investment.
Yes. If your goal is to **compare furniture for 10–20+ year durability**, rather than simply shop by appearance and reviews, some online retailers are substantially better than others at publishing the information you actually need. ### Best retailers for construction transparency Retailer | Material detail |…
Yes. If your goal is to compare furniture for 10–20+ year durability, rather than simply shop by appearance and reviews, some online retailers are substantially better than others at publishing the information you actually need.
| Retailer | Material detail | Construction detail | Dimensions | Durability indicators | Overall |
|---|---|---|---|---|---|
| Room & Board | Excellent | Excellent | Excellent | Excellent | Best overall |
| Article | Very good | Good | Excellent | Good | Best mid-price option |
| Burrow | Good | Good | Excellent | Good | Best for modular furniture |
| Lundia | Excellent | Excellent | Excellent | Excellent | Best for shelving/storage |
| Crate & Barrel | Good–very good | Good | Excellent | Good | Strong |
| Pottery Barn | Good | Good | Excellent | Good | Strong, especially upholstery |
| West Elm | Good | Moderate–good | Excellent | Moderate–good | Product-dependent |
| IKEA | Excellent on many products | Excellent on many products | Excellent | Moderate | Great value, but highly SKU-dependent |
| Wayfair | Inconsistent | Inconsistent | Usually excellent | Inconsistent | Poorer for durability comparison |
roomandboard.com is unusually good for this purpose because individual product pages often tell you how the furniture is actually built, rather than just saying "high quality."
For example, its Grove armoire specifies solid-wood case construction, plywood drawer sides, dovetail joinery, ball-bearing glides, a 100-lb drawer capacity, adjustable shelves, dimensions, product weight, wood species, finish, and manufacturing location.
Its Linear collection similarly specifies solid-wood drawer components, dovetail joints, 3/4-extension ball-bearing glides, 100-lb capacity, welded bases, wood species, finish, and exact dimensions.
For sofas, the information can include frame material, suspension type, cushion construction and manufacturing location. Its Ericson sofa, for instance, specifies a benchmade hardwood frame and webbing suspension.
What makes it particularly useful: you can distinguish solid wood, veneer over engineered wood, plywood, different joinery methods, suspension systems, etc. That's much more meaningful for longevity than a generic "premium construction" claim.
article.com gives unusually accessible material and dimension information.
For example, its Amoeba table specifies 100% solid American walnut, dimensions, weight and box dimensions. Article Another table identifies solid American white oak and gives exact dimensions and weight.
Importantly, Article doesn't always pretend everything is solid wood. A Lloyd console, for example, lists solid Mindi wood, plywood and iron hardware in its materials specification.
Its upholstered pieces can be even more informative: a Rhett ottoman specifies a solid-pine/rubberwood-engineered-wood frame, nylon webbing, foam filling and a 50,000-rub Martindale fabric rating, as well as dimensions.
That makes Article particularly useful when you're comparing several similarly priced pieces.
lundiausa.com is worth a special mention for bookcases, shelving and storage. Its construction is focused on genuine solid-wood modular systems, and the company publishes unusually detailed comparisons of material construction.
For something like a shelving system you're hoping to keep for decades, I'd put Lundia near the top of the list.
burrow.com is worth considering when modularity is important. Its Nomad line, for example, is designed around modular components and tool-free assembly.
I'd rank Burrow below Room & Board for traditional furniture construction transparency, but its engineering and replaceable/modular approach can itself be a longevity advantage.
These are also reasonable sources when you scrutinize the individual SKU rather than relying on the retailer's reputation.
Pottery Barn, in particular, has many well-built upholstered pieces, with construction details such as engineered-wood frames and different upholstery specifications. Independent testing/reviews also tend to find its better sofa lines well constructed.
The catch is that neither retailer is uniformly using the same construction standard across its entire catalog.
Wayfair is the big one. It can have perfectly good furniture, but it's a marketplace containing huge numbers of manufacturers and brands. Two pieces that look almost identical can have radically different materials and construction.
For example, current Wayfair listings can range from products explicitly described as solid wood to pieces combining solid wood with manufactured wood or MDF.
So Wayfair is useful as a discovery and price-comparison site, but I'd generally investigate the underlying manufacturer before treating a listing as a durability comparison.
When comparing two pieces, I'd prioritize the specifications roughly like this:
For case goods (dressers, cabinets, tables):
For sofas/chairs:
One important caveat: "solid wood" alone does not mean durable. A well-designed plywood structure with good joinery can outlast a poorly joined solid-wood piece. Likewise, a sofa with a hardwood frame can still wear out quickly if its suspension and cushion construction are mediocre.
If you're trying to make genuinely apples-to-apples durability comparisons, I'd start with Room & Board, Article and Lundia, then use Crate & Barrel/Pottery Barn/West Elm selectively. Those retailers give you enough construction information that you're evaluating the furniture, rather than trying to infer quality from photographs and star ratings.
article.com gives unusually accessible material and dimension information.
For example, its Amoeba table specifies 100% solid American walnut, dimensions, weight and box dimensions. Article Another table identifies solid American white oak and gives exact dimensions and weight.
Importantly, Article doesn't always pretend everything is solid wood. A Lloyd console, for example, lists solid Mindi wood, plywood and iron hardware in its materials specification.
Its upholstered pieces can be even more informative: a Rhett ottoman specifies a solid-pine/rubberwood-engineered-wood frame, nylon webbing, foam filling and a 50,000-rub Martindale fabric rating, as well as dimensions.
That makes Article particularly useful when you're comparing several similarly priced pieces.
lundiausa.com is worth a special mention for bookcases, shelving and storage. Its construction is focused on genuine solid-wood modular systems, and the company publishes unusually detailed comparisons of material construction.
For something like a shelving system you're hoping to keep for decades, I'd put Lundia near the top of the list.
burrow.com is worth considering when modularity is important. Its Nomad line, for example, is designed around modular components and tool-free assembly.
I'd rank Burrow below Room & Board for traditional furniture construction transparency, but its engineering and replaceable/modular approach can itself be a longevity advantage.
These are also reasonable sources when you scrutinize the individual SKU rather than relying on the retailer's reputation.
Pottery Barn, in particular, has many well-built upholstered pieces, with construction details such as engineered-wood frames and different upholstery specifications. Independent testing/reviews also tend to find its better sofa lines well constructed.
The catch is that neither retailer is uniformly using the same construction standard across its entire catalog.
Wayfair is the big one. It can have perfectly good furniture, but it's a marketplace containing huge numbers of manufacturers and brands. Two pieces that look almost identical can have radically different materials and construction.
For example, current Wayfair listings can range from products explicitly described as solid wood to pieces combining solid wood with manufactured wood or MDF.
So Wayfair is useful as a discovery and price-comparison site, but I'd generally investigate the underlying manufacturer before treating a listing as a durability comparison.