Kirkland RSX
Residential Standard X
Kirkland zone RSX (Residential Standard X) permits ADU construction. Detached ADUs up to 1,200 sqft are allowed, with a 24ft maximum height.
Last updated 2026-05-15Refreshing this quarter
| DADU permitted | Yes |
|---|---|
| AADU permitted | Yes |
| Two ADUs per lot | No |
| Max DADU size | 1,200 sqft |
| Max AADU size | 1,200 sqft |
| Max height | 24 ft |
| Rear setback | 10 ft |
| Side setback | 5 ft |
| Lot coverage | 40% |
Smaller lots; same 1,200 sqft DADU cap.
Kirkland RSX ADU questions
Can I build a DADU on a Kirkland RSX lot?
Yes. Kirkland zone RSX allows detached ADU construction up to 1,200 sqft, with a 24 ft height limit. Setbacks and lot coverage still apply — see the spec table above.
Can I build an AADU on a Kirkland RSX lot?
Yes. Attached ADUs are permitted in Kirkland zone RSX up to 1,200 sqft. AADUs typically share utilities and structure with the primary house.
Can I build two ADUs on one Kirkland RSX lot?
No. Kirkland RSX permits a single ADU per lot under current code.
What are the setback and height limits for Kirkland RSX?
Kirkland RSX caps height at 24 ft, with a 10 ft rear setback and 5 ft side setbacks. Maximum lot coverage is 40%.
How do I confirm RSX applies to my specific Kirkland parcel?
Pull the parcel on the Kirkland 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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