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Committee advances multiplex appendix to let standardized 3‑story, 3–6‑unit buildings under IRC with added egress and EV rules

State Building Code Council — Building and Fire‑Related Workgroup (BFRW) · February 13, 2026
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Summary

BFRW approved a recommendation to send an IRC multiplex appendix to the full council that would allow 3‑story multiplexes (3–6 units) with specific limits (≤8,000 sq ft, ≤3 stories above grade plane and one basement), egress protections, unit separations, and EV‑ready parking requirements.

The BFRW voted Feb. 13 to forward a draft multiplex appendix for the International Residential Code that would let municipalities (statewide adoption) permit 3‑story multiplexes of three to six dwelling units built per modified IRC rules.

Staff said the appendix implements RCW 19.27.800 and establishes a clear scope: multiplex buildings are limited to three stories above grade plane (with at most one basement) and a maximum total floor area of 8,000 square…

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