Issaquah committee sends middle-housing questions to Planning Policy Commission; ADU size, density and affordability flagged for study

Issaquah’s Planning, Development and Environment Committee on Jan. 8 reviewed proposed amendments to Title 18 that would implement state middle-housing requirements and sought direction for issues the Planning Policy Commission (PPC) should study before making a formal recommendation.

The administration presented three core policy questions: whether lot density should be increased beyond the state-required baseline (two dwelling units per lot, with the state allowing four units if a lot is within a quarter-mile of a major transit stop or one unit is set aside as affordable), whether accessory dwelling unit (ADU) maximum size should rise from 1,000 to 1,250 square feet, and what additional items PPC should evaluate before returning a formal recommendation. Valerie Porter, Associate Planner, summarized staff analysis and case studies and recommended Option 1: align with state requirements.

Why this matters: the committee’s guidance will shape the PPC public hearing and the draft code returned to council. Changes could alter what property owners can build on single-family lots across Issaquah and affect parking, utilities and the city’s ability to secure affordable units tied to extra density.

Staff and committee discussion

Valerie Porter, Associate Planner, told the committee the administration favors compliance with state rules that require Issaquah (a Tier 2 city) to allow two units per lot and allow four units only if a lot is within a state-defined “major transit stop” or one unit is designated affordable. Porter also said the administration does not support a broad…