Seattle NR1
Neighborhood Residential 1
Seattle zone NR1 (Neighborhood Residential 1) permits ADU construction. Detached ADUs up to 1,000 sqft are allowed, with a 18ft maximum height.
Last updated 2026-05-15Refreshing this quarter
| DADU permitted | Yes |
|---|---|
| AADU permitted | Yes |
| Two ADUs per lot | Yes |
| Max DADU size | 1,000 sqft |
| Max AADU size | — |
| Max height | 18 ft |
| Rear setback | 8 ft |
| Side setback | 5 ft |
| Lot coverage | 35% |
Largest single-family lots; full DADU + AADU rights, no owner-occupancy requirement.
Seattle NR1 ADU questions
Can I build a DADU on a Seattle NR1 lot?
Yes. Seattle zone NR1 allows detached ADU construction up to 1,000 sqft, with a 18 ft height limit. Setbacks and lot coverage still apply — see the spec table above.
Go deeper: Read the DADU vs AADU in Puget Sound: which to build (2026) guide
Can I build an AADU on a Seattle NR1 lot?
Yes. Attached ADUs are permitted in Seattle zone NR1. AADUs typically share utilities and structure with the primary house.
Go deeper: Read the DADU vs AADU in Puget Sound: which to build (2026) guide
Can I build two ADUs on one Seattle NR1 lot?
Yes. Seattle NR1 permits a DADU + AADU combination on a single qualifying lot, subject to lot coverage and parking rules.
Go deeper: Read the DADU vs AADU in Puget Sound: which to build (2026) guide
What are the setback and height limits for Seattle NR1?
Seattle NR1 caps height at 18 ft, with a 8 ft rear setback and 5 ft side setbacks. Maximum lot coverage is 35%.
How do I confirm NR1 applies to my specific Seattle parcel?
Pull the parcel on the Seattle GIS viewer or send us the address — we verify zoning, overlays (critical area, shoreline, historic), and the practical buildable envelope at no cost.
Go deeper: Read the Seattle Design Review for ADUs: when it applies (2026) guide
Adjacent data
INTERNAL_LINKS / Deep Map