Sunnyvale, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R-0/R-1/R-2 single-story cap
- 45% lot coverage
- R-0/R-1/R-2 two-story cap
- 40% lot coverage
- R-1.5/R-1.7 cap
- 40% regardless of stories
- C-2/C-3 commercial cap
- 35%
- M-S/M-3 industrial cap
- 45%
- ADU exclusion
- First 800 sq. ft. excluded
Summary
Sunnyvale caps lot coverage for single-story homes in the R-0, R-1 and R-2 districts at 45 percent of the lot and two-story homes at 40 percent, under Table 19.32.020 of Municipal Code Chapter 19.32. R-1.5 and R-1.7/PD lots are capped at 40 percent regardless of story count, while most commercial and industrial districts allow 35 to 45 percent.
"Lot coverage" means the land area covered by all buildings on any lot, as computed from the outside dimension of each building, including corridors, supporting columns and unsupported wall projects, and enclosed and unenclosed roofed patios where the roof is more than 50% solid. The following shall not be calculated in lot coverage percentages: eaves; uncovered balconies, porches and stairways; fire escapes; landing places; fireplaces, and similar architectural features; underground parking structures which do not protrude above finished grade; and the first 800 square feet of each accessory dwelling unit. Table 19.32.020: R-0/R-1/R-2: Lot Coverage 45% (single-story dwellings), 40% (two-story dwellings). R-1.5/R-1.7/PD: Lot Coverage 40%. C-2/C-3: Lot Coverage 35%.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4856529; v14 updated 2026-05-19).
Full Breakdown
" The same definition excludes eaves, uncovered balconies, porches, stairways, fire escapes, fireplaces and similar features, underground parking structures that do not protrude above grade, and the first 800 square feet of an accessory dwelling unit from the coverage calculation. 020 sets the actual percentages: R-0, R-1 and R-2 single-family lots are capped at 45 percent lot coverage for single-story dwellings and 40 percent for two-story dwellings, alongside a 45 percent floor-area-ratio or 3,600-square-foot gross floor area cap, whichever is less. 7/PD cap coverage at 40 percent regardless of story count.
R-3, R-4, R-5, O, C-1 and C-4 districts cap coverage at 40 percent, while C-2 and C-3 allow 35 percent, and the M-S and M-3 industrial districts allow 45 percent. 020(d) folds detached accessory structures such as detached habitable spaces, detached parking and utility buildings into the same lot-coverage calculation and bars them from pushing a lot over its coverage cap unless a use permit is obtained. 020(a)(2) requires dwellings in R-0, R-1 and R-2 that exceed the maximum floor area ratio to go before the planning commission at a public hearing.
Violations & Fines
Exceeding the Table 19.32.020 lot-coverage cap without an approved use permit is a Title 19 zoning violation and an infraction under Section 1.04.010(b)(9) of the Municipal Code. Because no fixed fine applies to the offense, it is punished under Government Code Section 36900 per Section 1.04.020(b)(3), and the excess construction can be treated as a public nuisance subject to abatement under Section 1.04.040, with each day it remains a separate offense.
Frequently Asked Questions
What percentage of my Sunnyvale lot can I build on?
Does a detached garage count toward Sunnyvale's lot coverage limit?
Does an accessory dwelling unit count against my lot coverage cap in Sunnyvale?
Sources & Official References
Other rules in Sunnyvale
California rules heatmap·Compare Sunnyvale to another location·View the California building setbacks & zoning overview
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Lot Coverage Limits in Nearby Cities
How other cities in Santa Clara County handle lot coverage limits.