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 for primary structures plus accessory structures. Coverage limits help maintain open space, stormwater infiltration, and neighborhood character.
In the R5 zone, maximum building coverage is 45% of the lot area. This includes all structures — primary dwelling, garages, sheds, and other accessory structures. The R7 and R10 zones have different coverage limits appropriate to their larger lot sizes. Impervious surface coverage (which includes driveways, patios, and walkways in addition to buildings) may be subject to stormwater management requirements. Portland's residential infill project updated coverage standards for some zones. ADUs (accessory dwelling units) count toward lot coverage calculations.
Exceeding lot coverage limits is a zoning violation. Building permits will be denied for projects that exceed coverage limits. Existing non-conforming coverage may be grandfathered but cannot be expanded.
Portland, OR
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See how Portland's lot coverage limits rules stack up against other locations.
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