How big can an Edmonds ADU be?
✓ Verified against code · August 19, 2026
It depends on your zone: 1,200 sq ft of gross floor area in LDR-L and LDR-M, 1,000 sq ft in LDR-S — and garage space doesn't count, since GFA excludes unconditioned areas.
Citation: ECDC 16.20.060(C)
How current is this?
Edmonds’s ADU rules run under ECDC 16.20.060 (Edmonds Community Development Code) (Ordinance 4360 (amended by Ords 4397, 4398)). Edmonds complied with HB 1337 a full year early — Ordinance 4360 took effect June 19, 2024 — then reshaped the details again in mid-2025 with its middle-housing rezone (Ord 4397) and a follow-up amendment (Ord 4398). Note the city's own handout still cites the old code section number. We verified this answer against primary sources on August 19, 2026, and every change we catch is logged in the changelog.
More Edmonds ADU questions
- Do I need parking for an Edmonds ADU?
- I recorded an owner-occupancy covenant under the old rules — am I still bound?
- What will Edmonds impact fees cost on an ADU?
- When did Edmonds' current ADU rules take effect?
All Edmonds 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.