Building Setbacks & Zoning in Mountain View, CA

If you live in Mountain View or are thinking about moving there, building setbacks & zoning are one of those things you probably won't think about until they affect you directly. Mountain View has 3 specific rules on the books covering different aspects of building setbacks & zoning, and some of them might surprise you.

Lot Coverage Limits

In Mountain View's R1 and R2 zoning districts, Sec. 36.12.50(b) caps every accessory structure on a lot, combined, at 30 percent of the required rear yard, not the whole property. Structures under 5 feet tall are excluded from the count, but roof eaves deeper than 1 foot add to it.

Key details: Max cumulative coverage: 30% of required rear yard. Applies in: R1 and R2 zoning districts. Exempt structures: Under 5 ft in height. Roof eaves: >1 ft depth counts toward coverage.

Exceeding the 30-percent rear-yard lot-coverage cap, or miscounting roof eaves to stay under it, is enforced as a zoning code violation under the citywide penalty schedule in Sec. 1.7: up to $100 for a first infraction, $200 for a second within a year, and $500 for each further violation, with a fourth violation in the same year chargeable as a misdemeanor.

Setback Rules

Mountain View's R1 single-family zone sets minimum yard setbacks in City Code Sec. 36.10.25: 20 feet from the front property line for the first-floor wall, at least 5 feet per side, 15 feet on a corner lot's street side, and a rear setback equal to 20 percent of lot depth or 15 feet, whichever is greater, capped at 40 feet.

Key details: Front setback: 20 ft minimum, first-floor wall. Side setback: 5 ft minimum per side (10-12 ft total). Corner lot street side: 15 ft minimum. Rear setback: 20% of lot depth or 15 ft, capped at 40 ft. Applies to: New construction, additions, replacement floor area.

Sec. 36.08.10 makes it unlawful to erect any building or structure inside a required setback line, with narrow exceptions for fences three feet or less and permitted signs, and directs the zoning administrator, city council or building inspector to refuse a construction permit for anything that violates the setback. A structure built into a required setback without an approved exception is a zoning violation subject to the city's code enforcement process.

Structure Height Limits

Mountain View caps single-family homes in the R1 zone at 24 feet for a one-story house and 28 feet for a two-story house under City Code Sec. 36.10.25, with separate wall-plate limits of 15 feet for a first-floor wall and 22 feet for a second-floor wall.

Key details: 1-story max height: 24 ft. 2-story max height: 28 ft. 1st floor wall plate max: 15 ft. 2nd floor wall plate max: 22 ft. R3 zone comparison: 45 ft max (36 ft to wall plate).

A house or addition built above the 24-foot (one-story) or 28-foot (two-story) height cap, or above the 15-foot and 22-foot wall-plate limits, does not qualify for a building permit under Sec. 36.10.25 unless it falls within one of the narrow exceptions in Sec. 36.08.30. Construction that exceeds these limits without such an exception, or without a variance, is a zoning violation the city can require be cut down or removed.

The Bottom Line

Mountain View's building setbacks & zoning rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Mountain View is broadly strict or permissive.

All of the above reflects Mountain View's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.