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Share House Bill 1337 - ADUs on FacebookShare House Bill 1337 - ADUs on TwitterShare House Bill 1337 - ADUs on LinkedinEmail House Bill 1337 - ADUs link
The Washington State legislature adopted new rules and regulations for Accessory Dwelling Units (ADUs) to expand housing opportunities.
An ADU is a dwelling unit on the same lot as a single-family, duplex, triplex, townhome, or other housing unit. It is a typical residential home with a kitchen, bedroom(s), and bathroom(s).
Cities across the state, including Renton, are required to follow their local ADU rules through House Bill (HB) 1337 by June 30, 2025.See the table below for a summary of the current and future ADU requirements.
Current- Effective through June 30, 2025
Future - Effective starting July 1, 2025
Owner Occupancy*
Required
Not required.
Permissibility*
One detached ADU per lot is allowed.
Two allowed ADUs per lot when all development regulations are met - units may be attached or detached.
Parking
One required parking space.
Parking requirements are based on distance to major transit stops and lot size.
ADU
Maximum ADU size is determined by lot size and principal size.
The minimum size limit is 1,000 sq. ft. when all development regulations are met.
Separate Sale*
The sale of ADUs as separate units is not allowed.
The sale of ADUs as separate units is allowed.
*The restrictions placed on ADUs built before June 30, 2025, will no longer be in effect when the new legislation is adopted.
The city's Planning Commission will present and review proposed and required code adjustments. Renton residents are welcome to participate in public feedback.
In addition to code changes, the current ADU fee waivers will expire on December 31, 2024. New fee rates will go into effect on January 1, 2025, and July 1, 2025.
Through its Permit Ready ADU Program, the city will continue offering free ADU model base plans for residential property owners within the city limits.
The Washington State legislature adopted new rules and regulations for Accessory Dwelling Units (ADUs) to expand housing opportunities.
An ADU is a dwelling unit on the same lot as a single-family, duplex, triplex, townhome, or other housing unit. It is a typical residential home with a kitchen, bedroom(s), and bathroom(s).
Cities across the state, including Renton, are required to follow their local ADU rules through House Bill (HB) 1337 by June 30, 2025.See the table below for a summary of the current and future ADU requirements.
Current- Effective through June 30, 2025
Future - Effective starting July 1, 2025
Owner Occupancy*
Required
Not required.
Permissibility*
One detached ADU per lot is allowed.
Two allowed ADUs per lot when all development regulations are met - units may be attached or detached.
Parking
One required parking space.
Parking requirements are based on distance to major transit stops and lot size.
ADU
Maximum ADU size is determined by lot size and principal size.
The minimum size limit is 1,000 sq. ft. when all development regulations are met.
Separate Sale*
The sale of ADUs as separate units is not allowed.
The sale of ADUs as separate units is allowed.
*The restrictions placed on ADUs built before June 30, 2025, will no longer be in effect when the new legislation is adopted.
The city's Planning Commission will present and review proposed and required code adjustments. Renton residents are welcome to participate in public feedback.
In addition to code changes, the current ADU fee waivers will expire on December 31, 2024. New fee rates will go into effect on January 1, 2025, and July 1, 2025.
Through its Permit Ready ADU Program, the city will continue offering free ADU model base plans for residential property owners within the city limits.
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