Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Vancouver ADU cost →Building an ADU in Vancouver costs between $150,000-$350,000 for new construction, with per-square-foot costs averaging $200-$400. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $60,000-$150,000, while prefab/modular ADUs fall in between at $135,000-$340,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | 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. |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. We pass your request to up to 5 local builders serving Vancouver, where we have them — free, no obligation.
Get Vancouver builder quotes →Permit fees in Vancouver are 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.. The review timeline is 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., with 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.. Impact fees are 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.. Pre-approved plans: None published by the City of Vancouver as of September 2026 - the City ADU page and residential-permit page list no pre-approved ADU plan sets (the City's 'Pre-Approved Building Code Alternatives' are construction details, not ADU plans). Confirm with the Permit Center (360-487-7800) before assuming a stock-plan discount..
| 1-Bedroom Rent | $1,500-$1,800/month |
| 2-Bedroom Rent | $1,750-$2,100/month |
| Annual Rental Income (est.) | $19,800/year |
| Payback Period (est.) | 12.6 years |
| Short-Term Rental | Allowed with a City short-term rental permit ($265 in the 2026 fee schedule, Section 30) plus Washington State and City of Vancouver business licenses, $1 million liability insurance and a mailed notice to abutting and a. |
| Overall ROI Estimate | 6-12% gross rental yield (e.g. $1,700/mo on a $200,000 build is about 10% before vacancy, taxes, the impact fee and financing); roughly 4-8% after expenses |
A typical ADU in Vancouver generates approximately $19,800 per year in rental income based on average 1-bedroom rents. At an average construction cost of $250,000, the estimated payback period is 12.6 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Vancouver and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Vancouver: $60,000-$150,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $135,000-$340,000.
3. Pre-approved plans — available in Vancouver, which can save $3,000-$10,000 in design costs and 2-3 months in review time. See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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