Rules by State
/ Oregon
Oregon OR ADU Rules
ADU Friendliness Score
79
★ Favorable
Size & Dimensions
Max ADU Size (Detached)
800 sq ft
Max ADU Size (Attached)
800 sq ft
Min ADU Size
None
JADU Max Size
500 sq ft
Max Height (Detached)
18 ft
Stories Allowed
2 stories
Setbacks & Lot Coverage
Rear Setback
4 ft
Side Setback
4 ft
Front Setback
Same as primary dwelling
Minimum Lot Size
None
Fire Sprinklers
Not required if primary doesn't have them
Owner Occupancy & Rental Rules
Owner Occupancy Required?
No
Rental Income Allowed?
Yes
ADUs Per Lot
1 ADU + 1 JADU
Permitting Process
Review Timeline (Ministerial)
60 days
Design Review Required?
None