How close to the lot line can my DADU sit?
✓ Verified against code · August 19, 2026
Five feet from side and rear lines — but only if it's a stand-alone DADU. Combine it with a garage or other structure and standard setbacks apply, so the configuration choice matters.
Citation: SMC 21.04.030.C conditions (4), (7)
How current is this?
Sammamish’s ADU rules run under SMC 21.05.010.C(5) / 21.04.030.C (Sammamish Municipal Code) (Ordinance O2024-578). Sammamish's Title 21 rewrite (Ord O2024-578) took effect January 1, 2025 — six months ahead of the state deadline. Beware the city's own DADU handout: last revised September 2023, it still shows an 18-ft height limit, one-DADU cap, and two-space parking rule, all long repealed. We verified this answer against primary sources on August 19, 2026, and every change we catch is logged in the changelog.
More Sammamish ADU questions
- Does a Sammamish ADU count against my floor-area (FAR) limits?
- How tall can a Sammamish DADU be?
- Do I need parking for a Sammamish ADU?
- How many ADUs can I build, and how big?
All Sammamish ADU rules → · Compare Washington cities →
Not legal advice — lot-specific overlays can change the answer for your parcel. The citation above points at the governing code section; check it, or ask the city to confirm.