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

Table 20.08-2, Development Standards for Single-Family Residential Zoning Districts (Sec. 20.08.030), sets a maximum lot coverage that scales with the zoning subzone: 25 percent in Rural Residential (R-R), 30 percent in R-1-20, 40 percent in R-1-10, 45 percent in R-1-6, and 50 percent in the smallest-lot R-1-5 subzone. Sec. 20.28.010.B makes clear that any accessory structure attached to the primary house, such as an attached garage or sunroom, is treated as part of the primary structure and 'shall comply with all standards applicable to the primary structure, including lot coverage requirements.' A detached shed or garage still contributes to the same lot-coverage total, since the standard limits total building footprint on the lot rather than just the primary residence.

For comparison, the city's Agriculture (A-G) zoning district caps lot coverage at just 2 percent under Table 20.18-2, reflecting the district's 20-acre minimum parcel size, while multi-family districts (R-2, R-3-2, R-3-1.5, R-4, R-MH) are governed by Table 20.08-3's setback and height standards rather than a stated lot-coverage percentage. Homeowners in R-1 subzones building an addition, a detached accessory dwelling unit, or an oversized shed need to run the combined building footprint against the applicable percentage in Table 20.08-2 before applying for a building permit, since a proposal exceeding the cap requires redesign or a formal variance rather than administrative approval.