Washington Statewide Rule

Washington Building Code Height Limits By Construction Type

Heavy RestrictionsApplies statewide across Washington (2026)

Washington adopts the International Building Code statewide through chapter 51-50 WAC, setting maximum heights and stories tied to construction type and occupancy classifications.

Key Facts

Authority: RCW 19.27 / WAC 51-50
Type V wood frame: 40 to 70 feet
Sprinkler bonus: +20 feet typical
Local override: Stricter only

Source: Washington State Legislature

Full Breakdown

RCW 19.27 mandates uniform statewide adoption of the IBC and IRC by the State Building Code Council. Tables 504.3 and 504.4 of the IBC, as adopted in WAC 51-50, fix maximum building heights from 40 feet for Type V wood-frame to 160 feet for Type IA noncombustible structures, modifiable by sprinklering. Cities cannot weaken these life-safety limits but may impose stricter zoning heights.

Violations & Penalties

Permit denial, stop-work orders, and code compliance penalties up to $500 per day under RCW 19.27.050.

Frequently Asked Questions

Can a city allow a wood building taller than 70 feet?

Only through state-adopted mass timber provisions. WAC 51-50 incorporates Type IV-A, IV-B, and IV-C mass timber heights up to 270 feet.

Do residential height limits come from state or local rules?

Single-family height in feet for zoning purposes is local. Construction-type maximum heights for life safety are set by the statewide building code.

Sources

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.

Full Breakdown

Frequently Asked Questions

Can a city allow a wood building taller than 70 feet?

Only through state-adopted mass timber provisions. WAC 51-50 incorporates Type IV-A, IV-B, and IV-C mass timber heights up to 270 feet.

Do residential height limits come from state or local rules?

Single-family height in feet for zoning purposes is local. Construction-type maximum heights for life safety are set by the statewide building code.