An ADU builder in Vancouver 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 Vancouver's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Washington.
What ADU Builders Cost in Vancouver [13][14][15]
Based on our Vancouver 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) | $150,000-$350,000 |
| Cost per Sq Ft | $200-$400 |
| Garage Conversion | $60,000-$150,000 |
| Prefab / Modular ADU (installed) | $135,000-$340,000 |
| City Permit & Plan Review | About $3,000-$4,600 in building and plan-review fees for a 500-1,000 sq ft ADU (2026 fee schedule: valuation-based Table I permit fee x 160% single permit, plus 50% plan review, $32 issuance, $6.50 state fee and $66.25 planning review), before impact fees and any water/sewer SDCs. |
| Impact Fees | 50% of the principal dwelling's fees (VMC 20.450.030.I.5): about $4,100-$6,300 for an ADU in the Vancouver and Evergreen school district areas (park $3,065 + traffic $1,003-$1,875 by TIF district + school $0-$1,393), up to about $10,300 in the Battle Ground SD portion; 2026 schedule, paid at permit issuance. Units over 1,000 sq ft pay full fees. |
For a full line-item breakdown, see our Vancouver ADU cost guide. To confirm what you're allowed to build before you hire, review the Vancouver ADU rules (max detached size: 1,000 sq ft or less to count as an ADU (VMC 20.150 definition; City ADU page). A larger detached unit is still allowed, but it is treated as a regular middle-housing unit and pays full impact fees. The only floor is the Washington State Building Code minimum for a dwelling unit.; owner-occupancy: Not required. The City ADU page states the owner is not required to live on the property, matching RCW 36.70A.681(1)(b); an ADU may be rented, used by family or sold as an individual unit. A long-term rental ADU must be registered with the City each year ($30 per unit from January 1, 2026); a short-term rental needs a City STR permit.).
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How to Vet an ADU Builder in Vancouver
- License: Confirm a current contractor's license in Washington 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 Vancouver 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 (About $3,000-$4,600 in building and plan-review fees for a 500-1,000 sq ft ADU (2026 fee schedule: valuation-based Table I permit fee x 160% single permit, plus 50% plan review, $32 issuance, $6.50 state fee and $66.25 planning review), before impact fees and any water/sewer SDCs.), plan check (Electronic review through ePlans after review fees are paid. Building plan review is 50% of the single-permit fee (2026 Table V); an ENG civil review is added only if the Request for Utility Services report requires it. No published turnaround.), and impact fees (50% of the principal dwelling's fees (VMC 20.450.030.I.5): about $4,100-$6,300 for an ADU in the Vancouver and Evergreen school district areas (park $3,065 + traffic $1,003-$1,875 by TIF district + school $0-$1,393), up to about $10,300 in the Battle Ground SD portion; 2026 schedule, paid at permit issuance. Units over 1,000 sq ft pay full fees.) are included.
- Permit handling: Confirm they manage Vancouver's permit process ("Residential building permit (RES) only - no land-use application, hearing or design review for 1-6 units on one lot with 3 or fewer floors (City Middle Housing page; VMC 20.420.100). First file the free Request for Utility Services (RUS), which reports water/sewer capacity and whether a civil engineering (ENG) review is needed; then apply in ePlans with the New Housing / New ADU application and Residential Housing submittal checklist. Planning review of the ADU is a $66.25 line on the RES permit (2026 fee schedule, Land Use Review 19.A.2).", typically The City publishes no review-time target for residential building permits. Allow time for the Request for Utility Services report before applying; independent 2026 Washington guides quote 8-16 weeks for ADU permit review.) 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 Vancouver 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 (The City publishes no review-time target for residential building permits. Allow time for the Request for Utility Services report before applying; independent 2026 Washington guides quote 8-16 weeks for ADU permit review.) 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 Washington ADU client references?
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