Portland residential zones cap lot coverage at 50% in R5/R7 and 60% in R2.5 (PCC 33.110). Unincorporated Multnomah County RR zones typically cap at 25% building coverage. Lot coverage calculations include the footprint of all structures with a roof. Stormwater management requirements apply to impervious surfaces over 500 sq ft or 50% of the lot.
Portland City Code 33.110.225 sets maximum building coverage in single-dwelling zones: R20/R10 (30%), R7 (40%), R5 (50%), R2.5 (60%). Building coverage is calculated as the total roofed footprint of all structures on the lot. Portland's Clean River Rewards program and Stormwater Management Manual (Title 17) require on-site stormwater management for new or redeveloped impervious surface over 500 sq ft in most cases, using rain gardens, drywells, eco-roofs, or permeable paving. Impervious surface coverage is distinct from building coverage - driveways, patios, and walkways count against impervious limits but not building coverage unless roofed. Gresham Development Code sets residential coverage at 40-50%. Troutdale permits up to 40% in R1 and 55% in R3. Unincorporated Multnomah County MCC 39 Rural Residential zones cap at 25% building coverage with much larger minimum lot sizes. MUA-20 allows 15-25% coverage depending on parcel use. EFU parcels have dwelling footprint limits rather than coverage percentages. Permeable pavers and eco-roofs may receive partial credit under stormwater rules. Coverage violations require adjustment (variance) and can delay permits significantly.
Exceeding building coverage: stop-work order and required correction. Portland BDS penalty $500 to $5,000. Unpermitted impervious surface causing stormwater issues: $500 to $25,000 under PCC 17.38 stormwater penalties. Required adjustment ~$2,500 fee.
Gresham, OR
Gresham addresses barking dogs through noise and animal control ordinances. Persistent barking that disturbs neighbors is a violation enforceable through Cod...
Gresham, OR
Gresham permits construction activities between 7 AM and 10 PM per GRC §7.20. Construction noise outside these hours is prohibited in residential areas.
Gresham, OR
Gresham Revised Code §7.20 regulates noise. Residential areas must not exceed 50 dBA between 10 PM and 7 AM, or 60 dBA between 7 AM and 10 PM at the property...
Gresham, OR
Gresham regulates on-street parking with time limits in certain areas. Vehicles must be currently registered and operable. Abandoned vehicles are subject to ...
Gresham, OR
Gresham requires driveways to meet development code standards. Vehicles must not block sidewalks or extend into the public right-of-way. Driveway modificatio...
Gresham, OR
Gresham restricts commercial vehicle parking in residential zones. Large commercial vehicles and heavy equipment may not be stored in residential areas.
Side-by-side rule comparisons with other cities in Multnomah County.
See how Gresham's lot coverage limits rules stack up against other locations.
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