An ADU builder in Buffalo is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Buffalo's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in New York.
What ADU Builders Cost in Buffalo [3][4]
Based on our Buffalo cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $110,000-$220,000 |
| Cost per Sq Ft | $120-$250 |
| Garage Conversion | $55,000-$130,000 |
| Prefab / Modular ADU (installed) | $80,000-$180,000 |
| City Permit & Plan Review | $2,000-$3,500 |
| Impact Fees | $500-$1,000 |
For a full line-item breakdown, see our Buffalo ADU cost guide. To confirm what you're allowed to build before you hire, review the Buffalo ADU rules (max detached size: 1,000 sq ft gross floor area; a detached unit must also be shorter and smaller-footprint than the principal building (Green Code UDO 6.1.2.B); owner-occupancy: Not required by the Green Code - UDO 6.1.2.B contains no owner-occupancy provision).
Get Free ADU Quotes in Buffalo
Tell us about your project and we'll connect you with ADU builders serving Buffalo. Free, no obligation — you choose who to work with.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
How to Vet an ADU Builder in Buffalo
- License: Confirm a current contractor's license in New York and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Buffalo and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits ($2,000-$3,500), plan check (2-3 weeks), and impact fees ($500-$1,000) are included.
- Permit handling: Confirm they manage Buffalo's permit process ("Building permit", typically 50-70 days) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Buffalo in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (50-70 days) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent New York ADU client references?
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Are you an ADU builder? Get Buffalo leads
Homeowners on this page submit real ADU project requests in Buffalo. We match each one to a local builder. Your first lead is free, then a small per-lead fee — no subscription, and you contract directly with the homeowner.
Get Buffalo ADU Leads →Frequently Asked Questions
How much do ADU builders charge in Buffalo?
How do I find a good ADU builder in Buffalo?
Do ADU builders in Buffalo handle permits?
How long does it take to build an ADU in Buffalo?
Get Free ADU Builder Quotes in Buffalo
Compare bids from experienced local Buffalo ADU builders. Free, no obligation.
Get Free Quotes →