ADU Builders by City (2026)
Compare verified accessory dwelling unit builders across 5 major US metros. Every builder listed below has a checked state contractor license, ADU-specific experience, and at least one completed unit in the city they serve. Free quotes, transparent pricing ($250–$600/sqft all-in).
Be the featured ADU builder for this page
One spot per city. Pinned above all other listings, with your phone, logo, and direct lead routing. Limited to verified, licensed design-build firms with at least 3 completed ADU projects.
ADU Builders by City
San Diego ADU Builders
CA Title 24 specialists, beach-zone permits
Los Angeles ADU Builders
LADBS-approved, RD1.5/R1 expertise
Portland ADU Builders
Bureau of Development Services experts
Bay Area ADU Builders
SB9 + JADU specialists, 9-county coverage
Denver ADU Builders
Group Living code, slope lots, Hardie siding
How We Verify Builders
- Active state contractor license verified against the state license board
- At least 5 completed ADUs in the listed city
- Workers' comp + general liability insurance on file
- 3+ referenceable past clients
- Fixed-price contract (no "time and materials")
ADU Builder vs Contractor — What's the Difference?
An ADU builder typically delivers turn-key projects: design + permitting + construction under one fixed-price contract. An ADU contractor is the licensed entity that performs the physical construction work — many homeowners hire a contractor separately after using a third-party designer. For most first-time ADU projects, hiring a turn-key builder is faster and lower-risk.
Need just the construction phase? Browse our verified ADU contractors directory by city (26 cities covered).
Frequently Asked Questions
What does an ADU builder do?
A licensed ADU builder handles end-to-end design, permitting, and construction of an accessory dwelling unit — including foundation, framing, MEP rough-in, interior finishes, and final inspections. The best builders also help homeowners pick a floor plan, navigate city pre-approval programs, and coordinate financing with HELOC, cash-out refi, or construction-loan lenders.
How do I find a good ADU builder?
Look for a builder with (1) an active state contractor license verified on your state's license-board site, (2) at least 5 completed ADUs in your specific city (different cities have wildly different code), (3) workers' comp + general liability insurance, (4) 3+ referenceable past clients, and (5) a fixed-price contract — not "time and materials." Aduglossary.com maintains city-by-city verified-builder directories below.
How much does an ADU builder cost?
ADU builders typically charge $250–$600 per square foot turn-key in 2026, all-in (design + permits + construction). That works out to $150,000–$500,000 for a typical 500–1,000 sq ft unit. Coastal California is at the top of the range, mid-tier metros like Denver and Austin sit at $250–$400/sqft, and garage conversions run 40–60% lower than ground-up builds.
Are accessory dwelling unit builders different from general contractors?
Yes — most successful ADU projects use an ADU-specialist builder rather than a generalist GC. ADU specialists know which set of city pre-approved plans qualify for fee waivers, how to handle utility-connection trenching, what setback variances are routinely granted, and how to sequence the build to minimize inspection delays. A general contractor without ADU experience often eats 4–8 weeks of avoidable schedule slip.
Are you an ADU builder? Can I be featured on aduglossary.com?
Yes — aduglossary.com sells one featured slot per city ($199/mo or $1990/yr — about 16% off) plus a pay-per-qualified-lead option ($500 setup + $50/lead). Featured builders get a sticky placement above the city directory, "Get Quote" CTA routing to your lead form, plus a branded write-up. Email partnerships@aduglossary.com or click "Claim this spot" on any city page.
Plan Your ADU Build
Use our free tools to estimate cost and ROI before contacting a builder.