Green Valley is unincorporated Pima County. Lot coverage is set by the Pima County Zoning Code (Title 18, Chapter 18.09 — General Residential and Rural Zoning Provisions). Each residential zone (CR-1, CR-2, CR-3, CR-4, CR-5, GR-1) has a specific maximum lot coverage; CR-1 (the most common Green Valley zone) typically allows around 40-50% lot coverage.
Because Green Valley has no separate city government, Pima County's Zoning Code (Title 18) applies. Chapter 18.09 (General Residential and Rural Zoning Provisions) lays out the dimensional standards for each residential zoning district — including minimum lot size, maximum building height, and maximum lot coverage. Most of Green Valley is zoned CR-1 (Single Residence) or CR-2 (Single Residence), with active-adult developments often falling under specific plans. CR-1 zones typically allow 40-50% lot coverage (counting principal and accessory structures), while higher-density CR-3 to CR-5 districts allow more. Pima County is the authority for verifying your parcel's zone via the PimaMaps GIS system (gis.pima.gov/maps). Green Valley's active-adult HOAs may impose stricter CC&Rs on coverage and architectural style.
Exceeding the lot-coverage cap requires a variance from the Pima County Board of Adjustment. Building without an approved variance can result in stop-work orders, demolition requirements, and daily fines under the County Zoning Code.
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Side-by-side rule comparisons with other cities in Pima County.
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