Does Olympia offer pre-approved DADU stock plans?
✓ Verified against code · August 19, 2026
Yes. Olympia offers six pre-approved DADU stock plans ranging from a 480 square foot studio up to a 1,000 square foot three-bedroom design, including a carriage-house-over-garage option. Because these plans are already vetted by the city, choosing one can streamline your permit review compared to a fully custom design. Check the city's ADU page for the current plan set and any updated launch details before committing to a design direction.
Citation: City ADU page (pre-approved plans, tax exemption)
How current is this?
Olympia’s ADU rules run under OMC 18.04.060 (Olympia Municipal Code) (Ordinance 7444 (amended by Ord 7457)). Olympia adopted its combined HB 1110/1337 package in November 2025 — about five months after the state deadline — making its rules the freshest of the region's major cities. Its ADU liberalization runs deep, though: zero parking has been the rule here since 2019, and the city's ADU history dates to 1995. We verified this answer against primary sources on August 19, 2026, and every change we catch is logged in the changelog.
More Olympia ADU questions
- Can I sell my Olympia ADU separately from my house?
- Do I need parking for an Olympia ADU?
- Is there a tax break for building an ADU in Olympia?
- How many ADUs can I build, and how big?
- When did Olympia's current rules take effect?
- What do Olympia's ADU park impact fees cost?
All Olympia 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.