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Pima County, AZ Building Setbacks & Zoning: Lot Coverage Limits (2026)

Some Restrictions

Verified 1 month ago|Source: Pima County Zoning Code Title 18 →

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Key Facts

GR-1 Coverage: Approximately 25% maximum
SR Coverage: Approximately 30% maximum
Urban Residential: Up to 40% in TR/SH zones
Includes: Buildings + impervious surfaces
Variance

City-specific rules exist: Marana, Oro Valley, Sahuarita, Green Valley, and Tucson have their own lot coverage limits rules that differ from Pima County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

Summary

Pima County limits lot coverage by zoning district: GR-1 rural at 25%, suburban ranch at 30%, and urban-adjacent residential zones up to 40%. Includes all impervious surfaces.

Full Breakdown

Lot coverage in unincorporated Pima County measures the percentage of a lot covered by buildings, paved surfaces, and other impervious structures. GR-1 (General Rural) zones typically limit coverage to 25 percent. Suburban Ranch (SR) zones allow approximately 30 percent coverage. More urban-adjacent residential zones (TR, SH) may permit up to 40 percent. Coverage includes primary structures, garages, carports, accessory buildings, patios (if covered), pools, and paved driveways. Pervious pavers and decomposed granite driveways may receive partial credit depending on material type. Lot coverage limits work in conjunction with setback requirements and building height to control development intensity. Exceeding lot coverage requires a variance from the Board of Adjustment or a special exception from the Board of Supervisors.

Frequently Asked Questions

How much of my lot can I cover with buildings in unincorporated Pima County?

It depends on your zoning district. Rural zones (GR-1) typically allow about 25% coverage, while suburban and transitional zones may permit 30-40%. Contact Pima County Development Services for your specific lot allowance.

Do driveways and patios count toward lot coverage?

Yes. Paved driveways, covered patios, and other impervious surfaces count toward lot coverage. Pervious materials like decomposed granite may receive partial or full credit depending on the material.

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Pima County, AZ Building Setbacks & Zoning: Lot Coverage Limits (2026)

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