Tacoma ADU Requirements and Zoning Laws — Washington

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ADU Regulations in Tacoma, Washington

Updated September 29, 2026

Located in Pierce County on Puget Sound, Tacoma has embraced Washington's HB 1337 reforms. The city waives parking requirements for ADUs within half a mile of frequent transit service, reflecting its commitment to transit-oriented development.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Tacoma as of 2026. Regulations are governed by Washington's HB 1337 (2023) which limits local ADU restrictions statewide.

Regulation	Requirement
Maximum Size	1,000 sq ft
Property Setbacks	5 ft rear, 5 ft side
Extra Parking Required	Not required (near transit)
Owner Occupancy	Not required

Additional Local Requirements for Tacoma

ADU allowed in most residential zones
Minimum 200 sq ft
Conversion of existing structures encouraged
No minimum lot size for ADU
Parking waived within 0.5 mile of transit (WA HB 1337)

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Frequently Asked Questions About ADUs in Tacoma

Can I build an ADU in Tacoma?

Tacoma has adopted Washington state ADU law (HB 1337) which limits local restrictions. Parking is waived if within 0.5 mile of transit.

What is the maximum ADU size allowed in Tacoma?

ADUs in Tacoma can be up to 1,000 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Tacoma planning department before designing your project.

What are the setback requirements for an ADU in Tacoma?

ADUs in Tacoma generally require setbacks of 5 ft rear, 5 ft side. Washington's HB 1337 (2023) limits how restrictive local ADU rules can be, but the exact setback figures come from Tacoma's own land use code — confirm them with the city before you design.

Disclaimer: This guide summarises publicly available city zoning rules and is for general information only — it is not legal or architectural advice. Codes change; always confirm current requirements with the Tacoma planning department before you design or build.

Tacoma ADU Zoning Rules & Permit Guide