Redmond limits building coverage and impervious surface in residential zones under RMC Title 21 and requires stormwater mitigation over specific thresholds in the Bear Creek and Sammamish basins.
Redmond Municipal Code Title 21 sets maximum lot coverage for principal and accessory structures by zone. In the R-4 single-family zone (about 5,000 sf minimum lot), building coverage is generally capped around 45 to 50 percent, with higher caps in small-lot R-6 and R-8 zones and lower caps in the large-lot R-1 through R-3 zones. Total impervious surface (buildings, patios, driveways, walkways) is separately regulated under Redmond's stormwater program and the Washington Department of Ecology 2019 Stormwater Management Manual for Western Washington. New or replaced impervious surface over 2,000 square feet typically triggers runoff treatment and flow-control best management practices such as detention, infiltration, or permeable pavement, especially in the Bear Creek, Evans Creek, and Sammamish River basins that support salmon runs. Tree retention and landscape coverage minimums, often 15 to 35 percent pervious depending on zone, further limit practical lot coverage.
Contact your local code enforcement office for specific penalty information.
Redmond, WA
Redmond does not ban gas leaf blowers, but restricts their use to daytime hours under RMC 6.32. Residential yard equipment is permitted between 7 AM and 10 P...
Redmond, WA
Industrial-source noise received in Redmond residential areas may not exceed 60 dBA daytime and 50 dBA nighttime under RMC 6.32 and WAC 173-60. Overlake and ...
Redmond, WA
Redmond generally allows overnight residential street parking within the 72-hour continuous-parking limit. Downtown time zones, snow events, and posted no-pa...
Redmond, WA
Redmond restricts on-street RV and boat parking to 72 hours and regulates driveway storage under RMC Title 21. Many zones limit the number of recreational ve...
Redmond, WA
Redmond regulates driveway width, surfacing, and apron construction under RMC Title 21 and Public Works standards. Residential driveways are typically 10-24 ...
Redmond, WA
Standard residential fences up to 6 feet in side and rear yards and 4 feet in front yards do not require a building permit in Redmond. Permits are needed for...
Side-by-side rule comparisons with other cities in King County.
See how other cities in King County handle lot coverage limits.
See how Redmond's lot coverage limits rules stack up against other locations.
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