Lot Coverage

If your zoning sets 35% lot coverage and your lot is 10,000 square feet, the footprint of your home, garage, and covered structures can total no more than 3,500 square feet on the ground. That percentage-of-lot-area math is what lot coverage controls: the zoning rule that caps how much of your lot the buildings can sit on.

The rule controls bulk and density. By limiting footprint, the city keeps open space, drainage area, and breathing room between homes, and it stops a lot from being almost entirely roofed over. What counts toward coverage varies by city: the main house and garage almost always count, while uncovered patios, pools, and driveways often do not, and covered patios or casitas may or may not, depending on the ordinance. Lot coverage works alongside setbacks and height limits, so the buildable footprint is whatever is left after all three rules apply.

For example, a Scottsdale lot might allow a generous footprint by setback alone, but a 35% coverage cap could still hold a single-story home to a smaller floor plate than the owner wanted, pushing the design toward a second story or a more compact footprint.

Lot coverage is different from a setback, which controls distance from the property lines, and from floor area ratio, which some cities use to limit total floor area across all stories. Coverage is strictly about ground footprint. Private CC&Rs can also set a stricter coverage limit than the city. We check the lot-coverage cap early, because it can quietly decide the maximum size of a single-story home before design begins.