Portland's Residential Infill Project (RIP) and Title 33 caps on floor area, height, and lot coverage limit mansionization in single-family zones while encouraging duplexes, triplexes, and ADUs.
Portland adopted the Residential Infill Project in 2020 (Ord. 190093) and expanded it in 2021–2022 to cap building size in former R5 and R7 zones at roughly 2,500 square feet of floor area for single-dwelling structures, with bonuses for additional units up to a fourplex (and sixplex on bonus lots). Title 33 also limits height to about 30 feet and lot coverage to around 40–50 percent depending on zone. The city's goal is to redirect development pressure away from teardown McMansions and toward middle housing. State HB 2001 (2019) reinforces middle-housing rights statewide. Plan check enforces FAR, height, and setback at permit issuance.
Permit applications that exceed FAR or height caps are denied at intake. Construction beyond approved envelope triggers stop-work orders, redesign requirements, or partial demolition.
Portland, OR
Portland allows ADUs by-right in all residential, commercial, and EX zones under PCC Chapter 33.205. Maximum size is 800 sq ft or 75% of primary home, whiche...
Portland, OR
Portland's Title 33 (Planning and Zoning) limits the maximum building coverage (lot coverage) in residential zones. The R5 zone allows up to 45% lot coverage...
See how Portland's anti-mansionization rules stack up against other locations.
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