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Council directs interim rules to allow duplexes, triplexes and limited ADUs under state law
Summary
To comply with new state housing laws, the council directed staff to draft interim development regulations permitting six middle-housing types, capping unit density on most lots at two (with four allowed near transit or for affordability), setting ADU size at 1,000 sq ft and applying impact fees to middle housing and ADUs.
The Mercer Island City Council Tuesday directed staff to prepare interim development regulations to implement Washington's recent middle-housing and ADU laws, and set follow-up hearings for ordinance adoption.
Allison Van Kork, deputy director of Community Planning and Development, summarized the state requirements contained in HB 1110 (middle housing), HB 1337 (ADUs) and related state provisions. "HB 1110 requires us to permit moderate density middle housing on all residential lots," Van Kork said, adding the legislation allows a menu of housing types and limits local parking and owner-occupancy restrictions.
The nut graf: to meet state deadlines and ensure local code compliance, council members approved a package of interim…
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