QA_INDEX / EXPERT_ANSWERS
ADU Questions, Answered
Direct answers from licensed Puget Sound ADU builders. No fluff. No SEO filler. Cost numbers, permit timelines, and zoning specifics are updated quarterly from real projects.
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Permits
7 answers- SeattleHow long does an ADU permit really take in Seattle?
- SeattleAre Seattle’s pre-approved DADU plans actually faster?
- SeattleDo I need a separate side-sewer for a Seattle DADU?
- BellevueIs it easier to build an ADU in Bellevue than Seattle?
- SeattleDoes Seattle charge ADU impact fees?
- Puget SoundDoes my basement need egress windows for a legal AADU?
- SeattleHow does Seattle tree retention affect my ADU project?
Zoning
7 answers- SeattleCan I really build two ADUs on a single lot in Seattle?
- SeattleDo I have to live on the property to build an ADU in Seattle?
- SeattleWhat are the setback rules for a Seattle DADU?
- KirklandWhat are the current ADU rules in Kirkland?
- RedmondCan I build a DADU in Redmond?
- SeattleCan I build a DADU on a 3,200 sqft Seattle lot?
- SeattleCan I run a Seattle ADU as a short-term rental (Airbnb)?
Cost & ROI
8 answers- SeattleHow much does a DADU really cost in Seattle in 2026?
- Puget SoundDADU vs AADU — which makes more financial sense?
- SeattleHow much can I rent a Seattle DADU for in 2026?
- SeattleWhat does it cost to convert a garage into an AADU in Seattle?
- SeattleHow much value does an ADU add to a Seattle home?
- SeattleHow much should I budget for ADU design and architecture?
- SeattleHow much will my property taxes go up after an ADU?
- Puget SoundIs an ADU cheaper than just adding onto my house?
Financing
1 answersBuild Process
7 answers- Puget SoundHow long does it take to actually build an ADU once permits are issued?
- Puget SoundWhat foundation should I use for a DADU?
- Puget SoundDo I need to upgrade my electrical service for an ADU?
- SeattleWhat are the most expensive mistakes Seattle homeowners make on ADUs?
- SeattleHow do I find a trustworthy ADU builder in Seattle?
- SeattleShould I install separate utility meters for my Seattle ADU?
- Puget SoundHow do I soundproof an attached AADU from the main house?