Grays Harbor County, WA Building Setbacks & Zoning: Lot Coverage Limits (2026)

Section 17.32.040 lists the building-site standards for the R-2 General Residential District, and subsection C states the maximum lot coverage by impervious surface at thirty-three percent of total lot area. That figure sits alongside the district's other building-site numbers: a ten-thousand-square-foot minimum lot for the first dwelling unit, fifteen hundred square feet for each added unit, a twenty-five-foot front yard, a ten-foot side yard for single- and two-family homes, and a twenty-five-foot rear yard. The same thirty-three-percent impervious-surface cap is not unique to R-2; it is written into § 17.20.050(E) for the G-1 district, § 17.24.050(E) for G-5, § 17.28.040(C) for R-1, § 17.40.050(E) for the RR Rural Residential District, and § 17.42.040(E) for the Lake Quinault district, making it the countywide default outside the commercial and industrial zones.

Because the limit is expressed as a share of total lot area rather than a fixed square footage, a bigger lot earns more impervious area in absolute terms, but the thirty-three percent ceiling applies the same way regardless of lot size within a given district. Anything counted as impervious surface, roofs, driveways, patios, parking pads, that pushes a site past that share requires either a smaller footprint or a variance from the board of adjustment before the county's Planning and Building division will approve the building permit.