⚠️ This information is for educational purposes. Always verify current regulations with the Bellevue Planning Department before starting your project.
Bellevue ADU Regulations at a Glance
Here are the key zoning rules for Accessory Dwelling Units in Bellevue, Washington. These regulations apply as of 2026.
| 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 | Required |
Additional Local Requirements
- ADU allowed in single-family zones
- Minimum 200 sq ft
- 5-year owner occupancy required
- Design review for exterior changes
📥 Get the Complete Bellevue ADU Cheat Sheet
To get the step-by-step permit checklist and the official local contacts, download the Complete Bellevue ADU Cheat Sheet.
Download the Bellevue PDF Guide — $12Frequently Asked Questions About ADUs in Bellevue
Can I build an ADU in Bellevue?
Yes, Bellevue allows ADUs under Washington state law and local zoning ordinances. [ADDITIONAL_FAQ_1]
How big can my ADU be in Bellevue?
The maximum size for an ADU in Bellevue is 1,000 square feet, subject to setback and lot coverage requirements.
Do I need a permit for an ADU in Bellevue?
Yes, all ADUs require a building permit from the Bellevue Building & Safety Department.
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