Bellevue R-1
Single Family R-1
Bellevue zone R-1 (Single Family R-1) permits ADU construction. Detached ADUs up to 1,000 sqft are allowed, with a 25ft maximum height.
Last updated 2026-05-15Refreshing this quarter
| DADU permitted | Yes |
|---|---|
| AADU permitted | Yes |
| Two ADUs per lot | No |
| Max DADU size | 1,000 sqft |
| Max AADU size | 1,200 sqft |
| Max height | 25 ft |
| Rear setback | 25 ft |
| Side setback | 10 ft |
| Lot coverage | 35% |
Largest residential lots. DADU requires Special Use Permit (SUP).
Bellevue R-1 ADU questions
Can I build a DADU on a Bellevue R-1 lot?
Yes. Bellevue zone R-1 allows detached ADU construction up to 1,000 sqft, with a 25 ft height limit. Setbacks and lot coverage still apply — see the spec table above.
Can I build an AADU on a Bellevue R-1 lot?
Yes. Attached ADUs are permitted in Bellevue zone R-1 up to 1,200 sqft. AADUs typically share utilities and structure with the primary house.
Can I build two ADUs on one Bellevue R-1 lot?
No. Bellevue R-1 permits a single ADU per lot under current code.
What are the setback and height limits for Bellevue R-1?
Bellevue R-1 caps height at 25 ft, with a 25 ft rear setback and 10 ft side setbacks. Maximum lot coverage is 35%.
How do I confirm R-1 applies to my specific Bellevue parcel?
Pull the parcel on the Bellevue 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 Eastside deck cost & permits: cedar, IPE, composite (2026) guide
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