Tacoma ADU Zoning Rules & Permit Guide

ADU Regulations in Tacoma, Washington

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.

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)

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.

How big can my ADU be in Tacoma?

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 about setbacks and other requirements in Tacoma?

What are the setback requirements for an ADU in Tacoma? ADUs in Tacoma generally require setbacks of 5 ft rear, 5 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.