Zone Zero fencing in San Diego: the city's fence rules

These are local rules, separate from the statewide Zone 0 rule, which the Board of Forestry adopted on 19 August 2026 but which has not taken effect. San Diego’s version is stricter on parallel fences. For other cities, see Zone 0 ordinances by city.

Who do San Diego’s Zone 0 fence rules apply to?

San Diego Fire-Rescue’s Zone 0 Guidelines for Existing Structures (Rev. 4/22/2026) apply to “all structures located in a Very High Fire Hazard Severity Zone within the City of San Diego.” The city’s 12 February 2026 news release put that area at roughly 142,571 acres, “or two-thirds of San Diego property.”

The rules come from the San Diego WUI Code (San Diego Municipal Code 512.0604), the California WUI Code and AB 3074. They cover the City of San Diego only. Other cities in San Diego County, and unincorporated county land, are not covered by this document.

What does section 4.6 of San Diego’s guidelines say about fences?

Section 4.6, “Fences and Gates,” has four parts.

1. A 5 foot transitional span at the house. “Where an existing fence or gate is attached and extends out perpendicular from the structure, a minimum 5-foot non-combustible transitional span is required.” In practice that is the side-yard fence and gate meeting the house.

2. No new requirements outside Zone 0. “For fences outside of Zone 0, there are no changes or new requirements.”

3. Parallel combustible fences are prohibited. “Where parallel combustible fencing (parallel to the structure) within Zone 0 creates a continuous fuel pathway and is capable of transmitting fire to a structure, it shall be prohibited.” The guidelines give two examples: “a single parallel combustible fence between two property owners, or a pair of parallel combustible fences, with each property owner having their own fence.”

4. Everything within 5 feet goes noncombustible under a compliance plan. “As part of an approved compliance plan provided by San Diego Fire-Rescue Department, all existing fences and gates within 5 feet of the structure must be made of non-combustible material unless they meet these exceptions.” The exceptions follow below.

Are vinyl fences allowed under San Diego’s Zone 0 rules?

Existing ones, in a narrow case. Under exception 1, “existing vinyl and fencing without combustible reinforcement” may stay within 5 feet of a structure only if all five conditions hold:

• it runs parallel to the structure walls;
• it is no less than 4 feet from the structure;
• it does not present “an unreasonable fire risk due to its condition, height or fuel accumulation”;
• it is kept free of debris;
• no vegetation exists between the fence and the structure.

So a vinyl fence 4 or 4.5 feet off the wall, running alongside the house, can stay if it meets the other conditions. A vinyl fence attached to the house cannot, because the attached section still needs the 5 foot noncombustible span. The guidelines also note that existing wood fencing “may be permitted where it does not create a continuous fuel pathway or increase the potential for ember ignition and fire spread, as determined by the fire code official.” For how vinyl behaves in a fire, see is vinyl fence fire resistant.

Can I build a new wood fence in San Diego’s Zone 0?

Only a parallel one made of listed fire-retardant-treated wood. Exception 2 says: “New parallel wood fencing is permitted if it is Fire Retardant Treated Wood (FRTW) and complies with all requirements for vinyl fencing, and it is on the California Office of the State Fire Marshal’s Wildland Urban Interface (WUI) Products Handbook and approved for exterior use.”

That means the new wood fence must run parallel to the house, at least 4 feet away, with no plants between it and the wall, and the product must be in the State Fire Marshal’s handbook. Our reading is that wood treated on site with a product that is not itself listed would not meet the exception; confirm with San Diego Fire-Rescue before you buy. FRTW does not count for the attached 5 foot span either; that span must be noncombustible.

Will my insurer accept what San Diego allows?

Maybe not. The guidelines flag several places where insurers can be stricter: “Your insurance provider and/or the IBHS may require at least one non-combustible fence where a pair of parallel fences is present,” and “may not allow vinyl or FRTW within 5 feet of a structure.” If you are working toward an insurance discount or the IBHS Wildfire Prepared Home designation, check those terms before relying on either exception.

When do San Diego homeowners have to replace fences and gates?

The guidelines set a phased plan:

The 2029 date is a target: homeowners “should attempt to achieve full compliance with Zone 0 regulations by February 28, 2029. This includes replacing fences and gates that do not comply.” The guidelines say the focus “is on education and progress, not on violations,” and an individual compliance plan may be set up where a specific violation is found. The guidelines also say they are “subject to change” and are “not enforceable until February 28, 2027.”

How is San Diego’s fence rule different from the state rule?

The statewide rule (14 CCR 1298.04 for local Very High zones) was adopted on 19 August 2026 and withdrawn from the Office of Administrative Law on 8 September 2026. It is not in effect as of 10 November 2026. Once effective, it would:

• require the same 5 foot noncombustible span where a fence attaches to the house, or comes within 1 foot of it;
• bar new combustible fences, “whether attached or parallel,” within 5 feet;
• allow repairs to an existing combustible fence with combustible materials.

The main difference is existing parallel fences. The state text does not order an existing parallel wood fence out of Zone 0, while San Diego prohibits one that creates a continuous fuel pathway and, under a compliance plan, allows only the vinyl and FRTW exceptions above. San Diego also allows new parallel FRTW fencing in Zone 0. By our reading that is looser than the state text, which would bar any new combustible fence within 5 feet, since FRTW does not meet the state rule’s noncombustible definition. The timelines differ too: the state clock for existing homes runs 3 to 5 years from an effective date that has not arrived, while San Diego’s runs to 28 February 2029.

AB 1455 (Government Code 51182(f)) lets a local agency adopt rules “more stringent” than the Board’s. The state rule’s fence provisions are covered in Zone 0 fence requirements, and gate details in Zone 0 gate requirements.

What does a compliant fence section cost in San Diego?

JJ’s Fence Company, a San Diego County contractor whose page cites the Rev. 4/22/2026 guidelines, publishes $2,000 to $2,500 for a 5 to 10 foot aluminum Zone 0 section without a gate, from $3,000 with a gate, and $2,500 to $5,000 for a full 30 to 50 foot side yard (undated page, checked 10 November 2026). More ranges and their basis are in our Zone Zero cost guide.

What could still change?

The guidelines say they are subject to change. A draft letter dated 11 March 2026 from the city’s Forest Advisory Board asks the council to repeal its Zone Zero policy over the effect on trees; the letter does not address fences. We will update this page when the city publishes a new revision.