Fence Regulations in Mountain View, CA: What Residents Actually Need to Know

If you live in Mountain View or are thinking about moving there, fence regulations are one of those things you probably won't think about until they affect you directly. Mountain View has 4 specific rules on the books covering different aspects of fence regulations, and some of them might surprise you.

Neighbor Fence Rules

Shared fences between Mountain View neighbors are governed by California Civil Code 841 which presumes equal cost sharing for maintenance with 30 day written notice required before work.

Key details: Governing law: CA Civil Code 841. Default cost share: 50/50 presumption. Notice required: 30 days written. Dispute forum: Small claims court. City role: Safety only not disputes.

Fence Permit Requirements

In Mountain View's R1 single-family zone, a fence needs no permit at all below set heights under City Code Sec. 36.06.50, but anything from six up to seven feet triggers a development review permit under Sec. 36.10.30(c). Taller fences and walls citywide face the same seven-foot ceiling and review process under Sec. 36.08.20.

Key details: Permit-free height: Up to 3 ft front, 6 ft rear/side (R1/R2). Development review trigger: 6 to 7 ft fences, R1 zone. Nonresidential cap: 7 ft without special approval. Review process: Sec. 36.44.45 Development Review. R3 zone fence cap: 6 to 7 ft, review required.

Building or replacing a fence above the exempt heights in Sec. 36.06.50(g) without first securing development review approval under Sec. 36.10.30(c) makes the structure an unpermitted zoning violation. Sec. 36.08.10 separately bars erecting any structure inside a required setback line, other than fences three feet or less, so an oversized fence built in a setback without permits can draw a stop-work order and required removal or after-the-fact permitting.

Retaining Walls

Mountain View only waives its zoning permit for a retaining wall when the wall retains earth only and creates a grade change of 18 inches or less, and even then only if Chapter 8 (Buildings) does not separately require a grading permit for the work.

Key details: Exemption threshold: 18 inches or less grade change. Exemption scope: Earth-retaining walls only. Cross-check: Must also not require a Chapter 8 grading permit. Governing section: City Code Sec. 36.06.50(m). Underlying permit rule: Sec. 36.06.35 bars unpermitted structures.

Constructing, reconstructing or altering a retaining wall that exceeds the 18-inch grade-change exemption, or one for which Chapter 8 requires a grading permit, without first obtaining the required zoning permit violates Section 36.06.35's restriction on establishing or altering land uses and structures without permits, exposing the property owner to city code enforcement.

Height Limits

Mountain View caps fences in R1 and R2 residential zones at three feet in the front yard and six feet on rear and side property lines without any permit, under City Code Sec. 36.06.50(g). Corner lots carry extra rules: fences stay at three feet inside a 35-foot traffic visibility triangle at the street corner.

Key details: Front yard fence height: 3 ft max (interior and corner lots). Rear/side fence height: 6 ft max, exempt from permit. Entry feature height: Up to 8 ft (arbors, trellises). Corner visibility triangle: 35 ft along street/front lines. Adjacent-lot triangle: 10 ft for side street fences over 3 ft.

A fence built taller than the heights in Sec. 36.06.50(g), or placed inside one of the corner-lot traffic safety triangles without meeting the reduced height, is not simply an oversized fence; it also loses the zoning permit exemption and needs the development review approval that Sec. 36.10.30(c) requires for fences between six and seven feet. Fences that also intrude into a required setback face the separate prohibition in Sec. 36.08.10.

The Bottom Line

Mountain View's fence regulations 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.

This guide is based on Mountain View's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.