IBHS Wildfire Prepared Home requirements for fences and gates

IBHS Wildfire Prepared Home requires a 5 foot noncombustible zone around the home, 30 feet of defensible space and a hardened roof, vents and wall base. In that 5 foot zone, every fence, post, gate and retaining wall must be metal, concrete, masonry or stone; vinyl, composite and fire-rated coatings do not count. Plus adds a back-to-back fence rule out to 30 feet.

That is stricter than California’s Zone 0 rule. The state text requires a noncombustible section only on fences that touch the house or come within 1 foot of it, and bars new wood fences within 5 feet. If insurance is part of the reason for the work, build to the Wildfire Prepared Home line. Discounts are covered in the Zone Zero insurance discount guide.

What does Wildfire Prepared Home require for fences and gates?

The Insurance Institute for Business & Home Safety (IBHS), the insurance industry’s research institute, runs the program. Fences sit in the first and most basic level, as item 1d: replace any combustible fence or retaining wall material, such as wood or vinyl, within the 0 to 5 foot zone with a noncombustible one, posts and gates in that zone included.

Acceptable materials are metal (aluminum, steel, chain link, iron), concrete, masonry and stone. Fire-resistant materials such as vinyl, composite or fire-rated coatings are not permitted. In one line: replace wood or vinyl fencing within 5 feet of the home with noncombustible fencing, such as metal.

Three details change where that 5 feet lands:

• Decks move the line out. You measure 5 feet from the exterior walls, but where an attached combustible structure such as a deck extends from the home, you measure 5 feet from that structure’s outer edge instead. So a wood fence that meets the corner of a wood deck has to be noncombustible for 5 feet past the deck’s edge, which can put the end of the metal well beyond 5 feet from the wall.
• It goes all the way around. The measurement applies around the entire home in all directions, so a fence running alongside the house 3 feet out counts, even though it never touches the wall.
• Property lines. If the lot line is within 5 feet of the house, you may need to coordinate with a neighbor or HOA.

How is Wildfire Prepared Home Plus different?

There are two levels: Base, also called Essential, and Plus, also called Enhanced. A Plus home must meet every Base item first. Base protects against embers and is usually reached by retrofitting an existing home, while Plus adds protection from flames and radiant heat and is usually reached with new construction or after an exterior renovation.

For fences, Plus adds one item, number 10 on the checklist: if two combustible fences run parallel (back-to-back) less than 5 feet apart, remove one or replace one with a noncombustible material. It applies within 30 feet of the home, and you may need your neighbor’s help.

How does it compare with California’s Zone 0 rule?

The state rule the Board of Forestry adopted on August 19, 2026 has a narrower fence section than Wildfire Prepared Home on three points.

The Board points to part of this gap itself. Its Zone Zero guidance (adopted August 19, 2026, p. 29) says some insurers require the Wildfire Prepared Home Essential designation, whose requirements are “similar to the Board’s regulations, but they are more restrictive regarding trees and vegetation in Zone Zero.” On fences the table shows Wildfire Prepared Home is more restrictive too. The Board’s own fence rule is explained on Zone 0 fence requirements.

How much does the designation cost and how does the process work?

The process:

1. Finish all the work for your level using the checklist.
2. Pay the $125 nonrefundable application fee and upload photos showing each item is done.
3. IBHS reviews the photos and may send guidance, then orders a third-party evaluation: an evaluator visits the property to document and verify compliance.
4. IBHS issues a certificate. It is valid for three years, with required annual reviews, meaning yearly yard photos showing the 5 foot zone is still clear. After three years you reapply.

The program is open to single-family detached homes in California and Oregon. No processing time is published.

The $125 fee is small next to the fence work. In San Diego County, a 5 to 10 foot aluminum section at the house runs $2,000 to $2,500 installed, and from $3,000 with a gate. Because Wildfire Prepared Home also counts parallel fences inside the 5 feet, its budget can run higher than one built for the state rule. Worked budgets are on Zone Zero compliance cost.

Which California insurers and programs credit it?

• Mercury partners with IBHS and gives eligible homeowners a discount on the Catastrophe Fire portion of the premium, up to 50% of the wildfire portion for qualifying certifications.
• AAA (CSAA) has separate discount lines for the Essential and Enhanced designations in California. The figures are on wildfire mitigation discounts by insurer.
• State Farm filed underwriting guidelines in September 2026 that would let it consider new California homeowners applications for homes with a qualifying designation. That is about eligibility for a policy; State Farm gives no discount figure.
• Safer from Wildfires. The Department of Insurance rule behind it, 10 CCR 2644.9, does not mention IBHS. It lists ten property measures, one of which ((d)(1)(B)1.c) is “incorporation of only noncombustible materials” into improvements “including fences and gates” within 5 feet of the building. A home that meets item 1d also meets that fence wording. How the ten measures work is on Safer from Wildfires, item by item.

What should you check before you start the fence work?

1. Measure 5 feet from every exterior wall and from the outer edge of any attached deck, patio or stairs. Mark every fence, post, gate and retaining wall that crosses that line.
2. If you are aiming for Plus, walk 30 feet out and note any spot where your fence and a neighbor’s run parallel less than 5 feet apart.
3. Ask your insurer whether it wants the designation certificate, its own verification form, or both. AAA, for one, accepts either a designation or a form from a wildfire professional.
4. For metal, ask the installer for the product’s ASTM E136 report if you also want the work to count under the state rule. Wildfire Prepared Home names aluminum outright; the state rule relies on the test, and aluminum raises a question there that steel does not (is aluminum noncombustible).
5. Take dated before and after photos of each fence section. You need photos when you apply and again every year.