How Brentwood Handles Fence Regulations: A Practical Guide

Brentwood maintains 142 local ordinances across all categories, and 4 of those deal specifically with fence regulations. Here is a breakdown of what the city actually requires, what is prohibited, and where Brentwood falls on the strict-to-permissive spectrum compared to other cities.

Material Restrictions

Brentwood outlaws barbed wire, razor wire, electrified fencing, and chain link visible from public areas in every residential zone. Commercial properties can use these materials only with planning commission design review or conditional use permit approval, or when another law requires them. Temporary mesh and panel fencing is barred outside construction sites and permitted events.

Key details: Barbed/razor/concertina wire: Prohibited in all residential zones. Electrified fencing: Prohibited residential; restricted commercial. Chain link: Banned only if visible from public areas. Temporary mesh/panel fencing: Barred except construction sites/events. Utility easements: No fences or walls allowed.

Installing a prohibited material triggers a code enforcement case under Section 1.20.010: officers can cite the property owner for an infraction, punishable by up to $100 for a first offense, up to $200 for a second within a year, and up to $500 after that, with the city attorney able to escalate a repeat violation to a misdemeanor carrying up to $1,000 and six months in jail. Every day the fence stays up counts as a separate offense until it is removed or replaced.

Compared to other cities, Brentwood takes a harder line on material restrictions. The enforcement and penalty structure reflects that.

Height Limits

Brentwood residential fences top out at 7 feet along side and rear lines, drop to 42 inches in the front yard, and shrink to 42 inches inside the corner-lot sight triangle. Nonresidential fences in side and rear yards can reach 8 feet. Height is measured from the higher side when grade differs across the fence line.

Key details: Side/rear yard fence max: 7 feet. Front yard fence max: 42 inches. Corner-lot sight triangle max: 42 inches. Nonresidential side/rear max: 8 feet. Visibility hazard correction window: 10 days after notice.

A fence that blocks visibility at a driveway or intersection must come down or be modified within 10 days of the city's written notice under Section 17.660.008(B). Beyond that, oversized or noncompliant fences are code violations under Section 1.20.010: a first infraction runs up to $100, a second within a year up to $200, and repeat violations up to $500, or a misdemeanor carrying up to $1,000 and six months in jail.

Retaining Walls

Brentwood caps a single retaining wall at 4 feet and requires benching with a 2-foot horizontal gap between walls on taller embankments. A building permit is mandatory once a wall exceeds 4 feet from footing to top, or when it supports a steep surcharge slope. A geotechnical engineer's report can justify a taller exception.

Key details: Max single wall height: 4 feet. Bench gap requirement: 2 feet horizontal minimum. Permit trigger: Over 4 ft, footing to top. Taller wall exception: Needs geotechnical engineer report. Approval authority: Chief building official or public works director.

Building a retaining wall over 4 feet without the required permit, or without the engineered benching on a taller embankment, is enforced as a Brentwood Municipal Code violation under Section 1.20.010: infractions run up to $100 for a first offense, up to $200 for a repeat within a year, and up to $500 after that, with the city attorney free to prosecute a persistent violation as a misdemeanor carrying up to $1,000 and six months in jail.

Neighbor Fence Rules

Hedges and landscaping used as boundary barriers in Brentwood are subject to the same height limits as fences (3.5 ft front, 6 ft side/rear) when used to enclose a yard. Hedges must not encroach into the public right-of-way, block sidewalks, or obscure sight lines at intersections.

Key details: Front hedge height: ~3.5 ft. Side/rear: Taller generally OK. Sidewalk clearance: 7 ft vertical. Street clearance: 13.5 ft vertical. Visibility triangle: 3 ft max.

The Bottom Line

Brentwood'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 Brentwood is broadly strict or permissive.

These rules come from Brentwood's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.