ADU Regulations in Redmond, Washington
Home to Microsoft's headquarters in King County, Redmond permits ADUs under Washington's HB 1337. The city's Link Light Rail extension has created transit zones where parking requirements are waived for ADU projects.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Redmond 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 Redmond
- ADU by right in residential zones
- Minimum 200 sq ft
- Tree retention standards may apply
- Light rail proximity waives parking (HB 1337)
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Can I build an ADU in Redmond?
Redmond permits ADUs under Washington's HB 1337. Parking is not required near the Redmond Technology transit station.
How big can my ADU be in Redmond?
What is the maximum ADU size allowed in Redmond? ADUs in Redmond 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 Redmond planning department before designing your project.
What about setbacks and other requirements in Redmond?
What are the setback requirements for an ADU in Redmond? ADUs in Redmond 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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