Documentation

Prove it or it didn't happen: documenting your fence upgrade for insurance

Fact-checked August 19, 2026·Sources at the end of this article

The credit exists, but only if your insurer knows

This credit is not new. California has required it since October 14, 2022. The "Safer from Wildfires" regulation (10 CCR §2644.9) obliges any insurer that prices homeowners policies using wildfire risk to include a separate rating credit for a set of mitigation measures. The fencing measure reads:

Incorporation of only noncombustible materials into that portion of any improvements to the property on which the Building Being Evaluated is located, including fences and gates, which is situated within five (5) feet of the Building Being Evaluated

10 CCR §2644.9(d)(1)(B)1.c

On the Certification of Mitigation Criteria forms that carriers use to implement §2644.9, that fencing measure appears first on the list of twelve.

Two distinctions matter. First, this is a rating regulation. It requires insurers to offer a credit; it does not require you to replace anything, and it does not authorize your insurer to demand it. Second, the insurance credit is legally separate from the state's Zone 0 defensible space rule. The credit has been in force since 2022; the statewide Zone 0 regulation was approved on August 19, 2026 and is not yet in effect, pending Office of Administrative Law review and publication by the Secretary of State, and the status tracker follows that process. You do not need to wait for that process to finish to claim the credit. What the regulation requires of fences is covered in our California Zone 0 fencing guide.

Why your insurer probably can't see your fence

Insurers increasingly score wildfire risk with aerial imagery and property-attribute models. Those models commonly resolve at about 30 meters. A fence is invisible at that scale. Cape Analytics, Nearmap, and Verisk publish property-attribute lists, and none of them mentions fences.

The exception is ZestyAI, which markets a "CA Compliance Pre-Fill" product to California insurers built around the twelve mandatory mitigation factors, including fence detection, and claims its Z-FIRE model is used by carriers insuring 40% of the California homeowners market. That figure is the vendor's own claim. Even if your carrier uses the product, do not rely on being detected from above.

The practical consequence: documentation is how the improvement gets counted. If the file you send your agent is the only record that your fence changed, that file is doing all the work. Prove it, or as far as your insurer is concerned, it didn't happen.

The documentation stack

Five items. Assemble them as the work happens, not months later.

On item 3: ASTM E136 is a vertical tube furnace test at 750 °C that measures whether the material itself can burn. In practice, aluminum, steel, wrought iron, chain link, masonry, concrete, and stone pass. Wood, vinyl, composite, fire-retardant treated wood (FRTW), and fire-rated coatings do not. A "Class A" rating is not a substitute; that comes from ASTM E84, a tunnel test designed for interior finishes. Our guide to noncombustible fence materials goes deeper.

Photograph the posts and footings, not just the panels. A metal panel on a wood post fails the intent of the measure. The same goes for gate hardware, latches, and any wood blocking where the fence meets the wall. If you are building the span yourself, the five-foot noncombustible transition guide shows what the finished work should look like.

On item 4: write the certificate in the words of §2644.9 itself, stating that within five feet of the building, the fence and gate now incorporate "only noncombustible materials." Using the regulation's own phrasing lets the person reading it at the carrier match your file to the measure on their form without interpretation.

What the certificate must not say

A certificate that overclaims is worse than no certificate. Three lines to keep out of it:

• No rate promises. Carrier-published discount figures are the carriers' numbers, not commitments to you. A certificate records work performed; it does not project savings.
• Not "Zone 0 compliant." As of August 19, 2026 the statewide Zone 0 regulation is adopted but not yet in effect, so there is no statewide compliance status to claim. The accurate phrasing is that the work "meets the requirements of the adopted Zone 0 regulation, which is not yet effective" and "meets the §2644.9 noncombustible-materials measure." If you are in a jurisdiction with its own ordinance in force (San Diego, Berkeley, Auburn, Laguna Beach, the Ventura County Fire Protection District, or the Moraga-Orinda Fire District), a compliance claim must name that specific ordinance.
• Not "fireproof" or "certified fire-resistant." No fence-assembly fire test exists in US code. ASTM's fencing committee (F14) maintains no fire test for fence assemblies, the ICC Evaluation Service "Fences and Gates" category contains no evaluation reports, and California's State Fire Marshal Building Materials Listing has no fence category. There is nothing to certify an assembly against. What you can substantiate is the material, via ASTM E136.

How to submit it, and the one question to ask

Send the pack to your agent or broker in a single message, with the cover brief up front. Then ask one specific question, and get the answer in writing:

Both words matter. Rating is where the §2644.9 credit lives. Underwriting is where eligibility and renewal decisions live, and mitigation can matter there too. Travelers, which expanded its mitigation discounts in April 2026, says mitigation "can improve both eligibility and pricing."

Be realistic about the rating half. The fence line item alone is typically worth 0.5%–1.2% at most carriers. A Resources for the Future review of every California rate filing from January 2022 to June 2025 found the average maximum property-level discount was about 5.65% (roughly $98 a year), rising to about 13% on average when community-level credits stack on top. Mercury and CSAA are outliers on the high side: Mercury publishes tiers of 12.5%–45% on the wildfire portion of premium, with a checklist naming "non-combustible fencing or gate materials where they attach to the home"; CSAA publishes a 1.0% "My Home Hardening" line item for noncombustible fences and gates within five feet, and up to 32% across all measures. Those are published figures, not promises. The California FAIR Plan's hardening discount (effective November 15, 2025) also names fences and gates within five feet. Mercury's own words: "Do wildfire mitigation efforts guarantee coverage? No. Eligibility and renewal decisions are subject to underwriting review." Carrier-by-carrier detail is in our fence insurance discounts guide.

The heavyweight route: IBHS Wildfire Prepared Home

If you want documentation with independent weight behind it, the IBHS Wildfire Prepared Home certification is the strongest route available. Its technical standard, updated June 17, 2025, is blunt about fencing:

All fencing materials within the 0–5 Foot Noncombustible Zone (Zone 0) must be noncombustible.

IBHS Wildfire Prepared Home Technical Standard (June 17, 2025)

The checklist allows metal (aluminum, steel, chain link, iron) or concrete only, and states that "Fire-resistant materials (e.g., vinyl, composite, or fire-rated coatings) are not permitted." The Plus tier additionally bars back-to-back combustible fences closer than five feet apart.

The payoff shows up in carrier programs. Mercury publishes 22.5%–37.5% for the base designation and 30%–50% for Plus. CSAA goes beyond a discount: with the certification, "your single-family homeowners policy won't be non-renewed due to wildfire risk and we will renew your homeowners policy for a minimum of three years if you maintain the certification and all other requirements of your policy." Researchers Kousky and You, reviewing filed underwriting criteria, read Farmers as currently insuring homes in high fire-risk areas only if they hold the IBHS WPH+ designation. That is the researchers' reading, not a carrier statement. The designation applies in California and thirteen other states. Fencing specifics are in our IBHS fencing guide.

Keep copies, because inspections have increased

What is documented: carrier inspections have increased, and mitigation affects eligibility at some carriers. What is not documented: any case of a homeowner being non-renewed over a wood fence. No specimen non-renewal letter naming a fence has been published, and California publishes no data on non-renewal reasons. So do not let anyone scare you into a purchase with "you'll be dropped," and do not conclude documentation is pointless either. The FAIR Plan has grown by more than 150% in three years; what your file ultimately protects is your ability to get covered at all.

The Board of Forestry has said publicly that Zone 0 compliance "won't guarantee insurance," and SB 1076, a 2026 bill that would require insurers to cover homes meeting state fire-safety standards, was introduced precisely because no such guarantee currently exists. Documentation does not create a guarantee. It creates a record, and a record is what gets credits applied and disputes resolved. Keep the full pack (photos, labels, substantiation, certificate, and the agent's written confirmation) with your policy records.

What this means for you

• Photograph the fence before any work starts. The "before" picture is the one you cannot recreate later.
• Ask your supplier for ASTM E136 documentation before you buy, and save every label and receipt.
• Write the certificate in the regulation's own wording. Claim only what you can substantiate: materials, not assemblies; work performed, not savings or statewide compliance.
• Submit the pack to your agent and ask them to confirm the measure is recorded in rating and underwriting. Get it in writing.
• Keep copies, re-send the pack if you switch carriers, and have it ready if an inspector visits.
• None of this is required: the statewide Zone 0 regulation adopted on August 19, 2026 is not yet in effect, so no statewide rule compels the work today, and the §2644.9 regulation does not require you to install a noncombustible fence; it requires insurers to credit one. The credit and the record are the reasons.