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Staff previewed substitute to HB 1110 implementation bill with edits on bonuses, heights and backyard cottages

Seattle City Council · December 16, 2025
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Summary

Central staff reviewed a substitute for Council Bill 120993 to implement House Bill 1110 changes to the land-use code: clarifications include raising the family-housing bonus, allowing certain rooftop features above a 42-foot height limit, incentives for Type A accessible units in projects of 10+ units, reinstating backyard cottage allowances, and adjusting setbacks for nonresidential structures.

Council central staff on Monday walked the council through a substitute version of Council Bill 120993, the city’s implementing legislation for House Bill 1110, describing a series of technical and substantive edits intended to align the bill with council intent and to correct drafting errors.

Staff said the substitute addresses a range of issues, including raising the family-housing bonus so family-sized units receive incentives consistent with other bonuses; clarifying that a 42-foot height limit for certain development types may allow rooftop features such as chimneys, elevator overruns or roof decks; adding an incentive for ‘Type A’ Americans with Disabilities Act–accessible residential units for projects of 10 or more units; restoring language that permits detached accessory dwelling units within 5 feet of the rear lot line (backyard cottages); and applying consistent setback limits for nonresidential structures in neighborhood residential zones. The substitute also extends rules that allow corner stores on any lot in neighborhood residential zones to low-rise zones where appropriate.

Staff said the substitute was prepared after council adopted more than 50 amendments to the implementing bill; some adopted amendments unintentionally produced inconsistent code language, which the substitute aims to correct so that council intent is clear and implementable. Staff offered to answer questions and asked council members to raise any concerns ahead of tomorrow’s full council vote.

The substitute and associated amendments are scheduled for consideration at full council tomorrow.