ID S1280

Prohibits counties and cities from banning twin homes or duplexes in any residential zone where single-family dwellings are permitted, with an exception for designated historic districts

Voids all restrictive covenants—both existing and future—that prohibit or unreasonably restrict construction of duplexes or twin homes on single-family lots, with violators liable for attorney's fees and damages

Requires local governments to amend comprehensive plans and land use regulations to permit twin homes and duplexes, limit parking requirements to one space per unit, and prohibit higher impact fees than those charged for single-family homes

Mandates administrative "as of right" approval for twin home and duplex projects that meet established land use requirements, without discretionary review

Takes effect July 1, 2026, under an emergency declaration, with a severability clause protecting remaining provisions if any portion is invalidated