Bothell, WA

Office Remodeling | Duwall, WA

On legally established lots in residential zones permitting single-family dwellings (and some mixed zones), the city allows up to two ADUs  per lot (either attached or detached) as an accessory use to a primary residence. Maximum size:  The living area of an ADU (excluding non-living areas) is limited to 1,000 square feet  in most cases. Setbacks & Location (for detached ADUs): Rear yard placement, minimum 5-foot side setback; along an alley no rear setback required. Height:

King County ADU / DADU Regulations В незанятой части King County ADU разрешены на участках с существующим жилым домом, согласно King County Code Title 21A (KCC 21A.08.030 B.7). Максимальный размер: ADU не должна превышать 1 000 кв. футов (≈ 93 м²) отапливаемой площади  и 1 000 кв. футов неотапливаемой площади . Если ADU полностью размещена в подвале или чердаке существующего дома — это ограничение может не применяться. В урбан-зоне возможно увеличение отапливаемой площади до

The maximum floor area  for an ADU (attached or detached) is 1,000 square feet . Up to two ADUs  may be allowed on a single lot in certain residential zones under the city’s Growth Management Act (GMA) authority. ADU projects must meet engineering and stormwater requirements , especially when located in combined sewer areas. In 2023, Ordinance 3963-23  simplified Everett’s ADU regulations to improve housing flexibility and affordability, streamline review, and relax setback a

Maximum size:  An ADU may not exceed 1,200 sq ft  or 40 percent of the combined gross floor area  of the principal dwelling plus the ADU (excluding garage space) — whichever is greater. Parking requirements: No parking is required if the ADU is under 1,000 sq ft  or located within ½ mile of frequent transit service . For ADUs 1,000 sq ft or larger , one parking space is required (unless the transit exemption applies). For ADUs over 2,000 sq ft , one space is required for lots

In urban zones (UGA – Urban Growth Area) , the maximum size for an ADU is 1,000 square feet  of floor area. In rural zones (outside the UGA) , the maximum size increases to 1,250 square feet . Only one ADU is permitted per lot of record  (either attached or detached). On lots smaller than 1 acre , detached accessory structures (including garages and workshops) cannot exceed 2,000 sq ft , excluding the ADU itself. Pierce County is currently reviewing housing code updates  to e

The prices for the Architectural Set are fixed and valid until May 2026. Type of Project Architectural Design Structural Engineering Civil (Drainage Report) (if required) Septic Design (if required) Additional Reports (if required) DADU < 1000 sq ft $3000 - $4,000 ~$3,800 ~$2,800 ~$3,500 Geotech / Arborist / Topo Survey — case-by-case DADU < 1000 sq ft + Garage $3000 - $4,500 ~$3,800 ~$2,800 ~$3,500 Geotech / Arborist / Topo Survey — case-by-case DADU 1000 sq ft $4,000 ~$3,80