Solar proposal and permit software

The strongest matches are Aurora Solar and OpenSolar. Both connect PV system design and customer proposals with bills of materials (BOMs) and permitting or engineering workflows. The important distinction is whether you need one shared project record or strict version control that ensures every deliverable reflects the same approved design.

Top PV design platforms to evaluate

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1. Aurora Solar

(Strongest overall match)

Aurora covers solar design, proposals, contracts, permit plan sets and engineering stamps. Its integrated racking workflows can generate BOMs that are available in the project and through APIs.aurorasolar.com+2

Best for: Residential installers seeking a unified design-to-permitting workflow.

Watch out: Some plan sets and engineering stamps are add-on services. Racking designs may need to be recreated after changes to the PV design.aurorasolar.com+2

Official website

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2. OpenSolar

(Strong integrated alternative)

OpenSolar combines design, proposals, hardware BOMs and procurement with connected permitting and engineering partners. Project details can be reused to request plan sets, engineering reviews, PE stamps and permit applications.www.opensolar.com+2

Best for: Installers wanting design-to-sales-to-procurement workflows with on-demand permitting.

Watch out: Permitting is partner-dependent, and the Shop BOM is managed separately from the design and proposal. Confirm how revisions propagate between these stages.www.opensolar.com+6

Official website

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3. SolarPro Design Platform

This platform advertises an integrated workflow spanning site surveys, PV layout, single-line diagrams, BOMs and permit packages.www.solarpro.solutions

Best for: Teams prioritizing rapid design-to-permit production.

Watch out: Validate engineering review capabilities, jurisdiction coverage and change/version tracking in a live demonstration.

Official website

If version control is the deciding requirement

Also evaluate PVcase for commercial, industrial and utility-scale PV. PVcase emphasizes a centralized engineering workflow, shared project data, design revision consistency, construction-ready documentation and BOM generation. Its CAD-based tools are particularly suited to engineering and EPC teams.pvcase.com+2

PVcase unified engineering workflow

One caveat: PVcase is not the same kind of homeowner proposal-first platform as Aurora or OpenSolar. I would assess it primarily for engineering handoffs and construction documentation.

Comparison against your requirements

These comparisons reflect published product capabilities, not independent verification that every output stays synchronized after every revision.aurorasolar.com+3

My recommendation: Start with Aurora Solar for residential PV, OpenSolar if procurement and partner-based permitting matter, and PVcase for larger engineering-led projects.

Before choosing, ask each vendor to demonstrate a single change—for example, replacing an inverter—and show whether the proposal, BOM, single-line diagram, permit plan set and engineering handoff all update together, with revision history and approval status preserved. That test will distinguish a genuinely controlled project workflow from a collection of connected document generators.

A few end-to-end cloud platforms bridge the gap between initial sales proposals and final engineering handoffs inside a single project container. However, true software engineering-style version control (branching, merging, commit histories, or rollback states like Git) is not natively built into standard solar design tools. Instead, these platforms rely on single-source-of-truth project histories —where design iterations, component swaps, and BOM updates stay tied to one live project record, updating downstream documents dynamically.aurorasolar.com+1

The primary all-in-one platforms handling this workflow from a unified project file include:

• 1. Aurora Solar
  • Proposals: Generates client-facing financial analyses, 3D visual models, and proposal summaries.
  • Bill of Materials (BOM): Automatically compiles equipment specs and racking counts as you map arrays.
  • Permit Plans: Features Instant Plan Sets to build AHJ-ready plan sets directly from the design data, or routes through integrated plan set services.
  • Engineering Handoff: Keeps data continuous from sales layout to procurement and structural/electrical verification without re-keying data.help.aurorasolar.com+2
• 1. OpenSolar
  • Proposals: Offers customizable, interactive online and PDF customer proposals linked directly to system design.
  • Bill of Materials (BOM): Manages component lists via the Project Shop , allowing adjustments to parts without breaking the underlying design.
  • Permit Plans: Generates permit documentation and layout maps natively within the platform workflow.
  • Engineering Handoff: Acts as an end-to-end workspace where project data transitions seamlessly from the design stage to execution and component ordering.support.opensolar.com+2
• 1. Solargraf (by Enphase)
  • Proposals: Instantly transitions 3D/2D shade-analyzed designs into branded financial proposals.
  • Bill of Materials (BOM): Auto-populates equipment lists based on the selected inverter, module, and racking parameters.
  • Permit Plans: Delivers automated permit design documentation to minimize soft costs and administrative delays.
  • Engineering Handoff: Unifies the pipeline so that changes made during the quoting phase carry over straight into final installation details.solargraf.com
• 1. HelioScope (by Folsom Labs)
  • Proposals / Layouts: Industry standard for commercial and residential production modeling and array configuration.
  • Bill of Materials (BOM) & Handoffs: Generates detailed single-line diagrams, kml/cad exports, and BOM tables that engineering firms and plan-set providers ingest directly to prevent version divergence between sales and construction.solarpermitsolutions.com

If you are looking for a platform that fits a specific workflow, let me know:

• Are you focused primarily on residential or commercial/industrial (C&I) projects?
• Do you require true Git-style version branching (for tracking alternate layout options side-by-side), or is a single unified revision history sufficient?