ADU Regulations in Renton, Washington
On the southern shore of Lake Washington in King County, Renton's ADU rules align with Washington's HB 1337. The city's proximity to Boeing and tech employment centers makes ADUs a popular housing option for workforce households.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Renton 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 | Required (1 space) |
| Owner Occupancy | Not required |
Additional Local Requirements for Renton
- ADU allowed in single-family zones
- Minimum 200 sq ft
- Height limit: 20 ft
- HB 1337 statewide limits apply
📥 Download the Complete Renton ADU Cheat Sheet
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Download the Complete Renton ADU Cheat Sheet — $12Frequently Asked Questions About ADUs in Renton
Can I build an ADU in Renton?
Renton permits ADUs in residential zones. Parking may be required depending on transit proximity.
How big can my ADU be in Renton?
What is the maximum ADU size allowed in Renton? ADUs in Renton 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 Renton planning department before designing your project.
What about setbacks and other requirements in Renton?
What are the setback requirements for an ADU in Renton? ADUs in Renton 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.
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