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Modesto, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

R-1 interior lot cap
50 percent maximum coverage
R-3 interior lot cap
60 percent maximum coverage
Corner lot caps
55/60/65 percent, R-1/R-2/R-3
ADU exemption
800 sq ft or less exempt
Governing table
Table 4.1-1, Section 10-4.102
Coverage definition
Section 10-2.141

Summary

Modesto caps residential lot coverage at 50 to 60 percent for interior lots and 55 to 65 percent for corner lots, scaling up from the R-1 to the R-3 zone, under Table 4.1-1 of Section 10-4.102 of the Municipal Code. Buildings and required parking spaces both count toward the cap, and accessory dwelling units under 800 square feet are exempt from it.

10-4.102 - Development Standards. The development standards for the residential zones are found in Table 4.1-1. The specific residential development standards provided after the table apply to all residential zones unless otherwise specified. Table 4.1-1 Residential Development Standards: Development Standards, Zoning Districts (R-1, R-2, R-3), Notes. LOT REQUIREMENTS... Coverage (maximum in %): Interior Lot 50 55 60, See Section 10-2.141. For accessory dwelling units, see Article 5. Corner Lot 55 60 65.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 71).

Full Breakdown

1-1, which applies across the R-1, R-2, and R-3 zones unless a specific section says otherwise. 141's definition of lot coverage. That definition, found in the Municipal Code's zoning definitions, counts the portion of a lot occupied by structures, including patios, porches, garages, and covered parking spaces, measured from exterior walls or support posts, but it expressly excludes gazebos, pergolas, wood decks, driveways, uncovered parking spaces, swimming pools, and retaining walls from the calculation. 105. 503. 415, since that zone sits outside the standard R-1/R-2/R-3 framework and its ten-acre minimum lot size.

Violations & Fines

Building coverage, including required parking, beyond the Table 4.1-1 percentage for the applicable zone violates Section 10-4.102. The Community and Economic Development Department reviews lot coverage at plan check before a building permit issues, and an addition or new structure that would push coverage past the cap will be rejected at plan check or, if built without a permit, subject to code enforcement and a stop-work or correction order.

Frequently Asked Questions

What is the maximum lot coverage allowed in Modesto's residential zones?
Coverage tops out at 50 percent of an interior lot and 55 percent of a corner lot in the R-1 zone, rising to 55/60 percent in R-2 and 60/65 percent in R-3, per Table 4.1-1 under Section 10-4.102 of the Modesto Code of Ordinances. The percentage is measured against the total lot area, not just the buildable envelope.
Does a garage count toward lot coverage?
Yes. Section 10-2.141 defines lot coverage as the portion of a lot occupied by structures, including patios, porches, garages, and covered parking spaces, measured from exterior walls or support posts. Required parking spaces count toward the Table 4.1-1 cap even when they are not covered by a roof.
Do decks and driveways count toward lot coverage?
No. Gazebos, pergolas, wood decks, driveways, uncovered parking spaces, swimming pools, and retaining walls are expressly excluded from the lot coverage calculation under Section 10-2.141, even though they are impervious surfaces. Only structures, patios, porches, garages, and covered parking spaces measured from exterior walls or support posts count toward the Table 4.1-1 percentage.

Sources & Official References

Other rules in Modesto

Setback RulesSome RestrictionsStructure Height LimitsSome RestrictionsNoise Ordinances: Vehicle NoiseSome RestrictionsParking Rules: Abandoned VehiclesSome RestrictionsAnimal Ordinances: Cat RulesSome RestrictionsAnimal Ordinances: Veterinary Clinic ZoningSome RestrictionsAnimal Ordinances: Pet Groomer RulesSome RestrictionsSign Regulations: Freeway-Facing SignsSignificant Restrictions

All Modesto rules

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