Vancouver ADU rules
✓ Verified against code · August 20, 2026
Current rules under VMC Title 20 (2026 Unified Development Code), adopted by Ordinance M-4533, in effect since July 31, 2026. Vancouver replaced its entire Title 20 in Ordinance M-4533, adopted June 1, 2026 and effective July 31, 2026 — three weeks before this verification. Both major code aggregators are still serving the superseded code: vancouver.municipal.codes states it is current only through an ordinance from December 2025. The only current text is the city's own PDF, which is where every rule below was read. Anything permitted between June 2025 and July 2026 fell under interim ordinance M-4517, not this code.
Common questions, answered from the code
What are Vancouver's current ADU rules?
Vancouver's rules changed on July 31, 2026, when a wholly new Title 20 took effect under Ordinance M-4533. Two ADUs per lot are allowed, at up to 1,000 sq ft each, with no off-street parking and no owner-occupancy requirement. Be careful where you read this: the major code aggregators were still serving the superseded code weeks after the change, so a guide or search result describing Vancouver's ADU rules may be describing a code that no longer applies.
Ordinance M-4533; VMC Title 20 · Permalink
How tall can a detached Vancouver ADU be?
There is no ADU-specific height limit. A detached ADU takes the height standard of its building type in the district, which reaches 45 ft in Low-Scale Neighborhood and 75 ft in Medium-Scale Neighborhood. Other standards — setbacks, impervious coverage, and the building type you choose — will usually bind well before height does, but the ADU rules themselves impose no ceiling.
VMC 20.430.070(B)(2); VMC 20.410.050(D) · Permalink
Do I need parking for a Vancouver ADU?
No. Vancouver requires no off-street parking for any residential use anywhere in the city. This is a blanket zero rather than the transit-proximity waiver most Washington cities adopted, so it does not matter how far you are from a bus or rail stop.
VMC Table 20.450.045-3 · Permalink
Can I sit a Vancouver ADU on the alley line?
No. Vancouver requires 5 ft from the rear lot line whether or not it abuts an alley — it grants no alley reduction, unlike Seattle, Spokane, Redmond and Bellevue. A detached ADU must also stand 10 ft from other structures on the lot unless you use sprinklers or fire-rated construction.
VMC 20.420.070(D) · Permalink
What do impact fees cost on a Vancouver ADU?
Half. Impact fees for up to two ADUs are assessed at 50% of the principal unit's rate. Separately, a three-year property tax exemption is available for ADU construction through the Clark County Assessor — but you have to file before construction finishes, so raise it early rather than after the final inspection.
VMC 20.450.030(A)(5) · Permalink
The rules at a glance
| ADUs allowed per lot | Two per lot, attached and/or detached, on a lot with a single-family home, duplex, triplex, fourplex, townhome or rowhome.VMC 20.150.030; VMC 20.450.030(A)(5) |
| Maximum size | 1,000 sq ft. Note the framing: this is the ceiling in the definition of an ADU, not a floor. A larger accessory unit can be built, but it is not classed as an ADU and loses the reduced impact-fee treatment.VMC 20.150.030 (definitions) |
| Detached ADU height | No ADU-specific height cap exists. A detached ADU follows the height standard of its building type in the district — 45 ft in Low-Scale Neighborhood, 75 ft in Medium-Scale Neighborhood. In practice other standards will bind first, but the ADU chapter itself imposes no ceiling.VMC 20.430.070(B)(2); VMC 20.410.050(D); VMC 20.410.060(D) |
| Detached ADU setbacks | 5 ft from a side lot line and 5 ft from a rear lot line, including where the rear line abuts an alley — Vancouver grants no alley reduction. A detached ADU must also stand at least 10 ft from other structures on the lot, or meet sprinkler and fire-rated construction alternatives.VMC 20.420.070(D), applied via VMC 20.430.070(B)(2) |
| Off-street parking | None. Vancouver requires no off-street parking for any residential use citywide — a blanket zero, not a transit-proximity waiver.VMC Table 20.450.045-3 |
| Owner-occupancy | Not required. The city states plainly that the owner need not live on the property where an ADU is located.VMC Title 20 (absence verified); City ADU page |
| Lot coverage / floor area | No floor-area ratio. Impervious area is capped at 65% of the lot with a minimum 20% open space in the Low-Scale district, applied to the primary and accessory structures together.VMC 20.420.070(C), applied via VMC 20.430.070(B)(2) |
| Permit path & timeline | A residential building permit, preceded by a Request for Utility Services so the city can run an engineering review. No published review timeline.City ADU page; VMC Title 20 |
Worth knowing
- Impact fees for up to two ADUs are charged at 50% of the principal unit's rate (VMC 20.450.030(A)(5)).
- A three-year property tax exemption is available for ADU construction through the Clark County Assessor, but you must file before construction is complete.
- An existing accessory structure may be converted to an ADU even if it is nonconforming on setbacks or impervious coverage (VMC 20.430.070(B)(3)).
- There is no ADU-specific height limit at all — a detached ADU inherits its district's building-type height, which runs to 45 ft in Low-Scale Neighborhood and 75 ft in Medium-Scale. That is unusually permissive; Spokane, for comparison, caps ADUs at a flat 25 ft.
- Whether an ADU may be used as a short-term rental is genuinely ambiguous in the new code: short-term rental use is barred "in an accessory structure," but an ADU is separately defined as a dwelling unit. The city caps active short-term rental permits at 870 citywide.
On our watchlist
Interim ordinance M-4517 governed from about October 13, 2025 until the permanent code took effect on July 31, 2026. Its ADU terms are not verified here; if you are looking at a permit issued in that window, a different set of rules applied.
Whether an ADU may be operated as a short-term rental is unresolved in the new code — the accessory-structure prohibition and the dwelling-unit definition point in different directions.
Primary sources
- VMC Title 20 (adopted code PDF — the only current text)
- City of Vancouver ADU information
- Land Use and Development (2026 code adoption)
Other Washington cities
Auburn · Bellevue · Bellingham · Bothell · Burien · Edmonds · Everett · Federal Way · Issaquah · Kent · Kirkland · Lynnwood · Olympia · Puyallup · Redmond · Renton · Sammamish · Seattle · Shoreline · Spokane · Tacoma
Not legal advice. Every fact above cites the code section it comes from — check the cite, or ask your city’s planning department to confirm your specific lot. Spotted an error or a new ordinance? See about to reach us; corrections are logged in the changelog.