To help more residents own and rent accessory dwelling units (ADUs), the City is currently seeking submissions of designs for detached ADUs, often called DADUs or backyard cottages. Pre-approved designs will offer a faster, easier, and more predictable path to permit and construct a DADU. Homeowners choosing a pre-approved plan will pay reduced permit fees and get their permit within 2-6 weeks for sites without protected trees or environmentally critical areas and that do not need drainage review.
New Accessory Dwelling Unit Regulations Begin August 8
The new accessory dwelling unit regulations go into effect on August 8, 2019. This was a multiyear effort to help increase the number and variety of housing options in single-family zones and to remove barriers to developing accessory dwelling units in the city.
Legalizing Backyard Cottages
The City of Seattle wants to remind homeowners of the grace period through June 30 for legalizing existing unauthorized backyard cottages. Under new regulations that went into effect December 4, 2009, backyard cottages became legal throughout Seattle. Previously, backyard cottages, also known as detached accessory dwelling units or DADUs, had been allowed only in southeast Seattle neighborhoods since 2006. Included in the December legislation is a grace period that allows owners of existing, unauthorized backyard cottages the opportunity to legalize their unit without penalty. Owners have until June 30, 2010 to apply for a building permit and until December 31, 2010 to obtain final inspection of the unit.
Legalizing Backyard Cottages
The City of Seattle wants to remind homeowners of the grace period through June 30 for legalizing existing unauthorized backyard cottages. Under new regulations that went into effect December 4, 2009, backyard cottages became legal throughout Seattle. Previously, backyard cottages, also known as detached accessory dwelling units or DADUs, had been allowed only in southeast Seattle neighborhoods since 2006. Included in the December legislation is a grace period that allows owners of existing, unauthorized backyard cottages the opportunity to legalize their unit without penalty. Owners have until June 30, 2010 to apply for a building permit and until December 31, 2010 to obtain final inspection of the unit.
