How Exterior Materials Affect Home Insurance in California
Serving Pleasanton, Dublin, Livermore, San Ramon, Danville, and Walnut Creek since 1997
If you own a home in a California wildfire zone, you have likely already felt the effects of the state's insurance market, even if your house has never been near a fire. Non-renewal notices, rising premiums, and a shrinking list of carriers willing to write new policies in wildfire-prone areas have pushed more homeowners toward the California FAIR Plan than at any point in the program's history.
What often gets lost in that conversation is that a second, separate set of rules applies to many of the same homes: California's building code for wildfire-exposed construction. Depending on where your home sits and what kind of project you're planning, your windows and siding may need to meet specific fire-resistance standards regardless of what your insurance company offers as a discount. Understanding both systems, insurance incentives and code requirements, before you start a window or siding project can save you a redo, a failed inspection, or a denied claim down the road.
Why California home insurance has gotten harder to keep
Several carriers have pulled back from writing new homeowners policies in high wildfire risk areas over the past few years, and non-renewals have pushed a growing number of homeowners onto the FAIR Plan, the state's insurer of last resort. Following the 2025 Los Angeles firestorms, FAIR Plan rates rose sharply in affected areas, and rising reinsurance costs are being passed down to homeowners across the state, not just in the communities directly affected by recent fires.
State lawmakers and the California Department of Insurance have responded with new consumer protections. Proposed legislation would require insurers to give homeowners more advance notice before a non-renewal and a chance to fix the issue first, and existing law can trigger a one-year moratorium on non-renewals in ZIP codes near a declared wildfire emergency. None of this changes the underlying dynamic, though: insurers are increasingly pricing and underwriting based on the specific wildfire risk of individual homes, not just their ZIP code.
The “Safer from Wildfires” regulation: your home's materials now affect your premium
Since 2022, California has required insurers that factor wildfire risk into their rates to offer discounts for specific wildfire mitigation actions, under a rule known as Safer from Wildfires. The regulation identifies a defined list of measures across three categories: community-level designations, defensible space, and home hardening. Home hardening measures include upgraded windows, enclosed eaves, and non-combustible materials such as fiber cement siding at the bottom of exterior walls, among other steps.
Each qualifying measure is filed and credited independently by the insurer, so a homeowner who completes several hardening steps, not just one, can stack multiple credits rather than qualifying for a single flat discount. Insurers are required to disclose which discounts they offer and what a homeowner could save by taking specific actions.
The takeaway for homeowners: window and siding replacement is not just an efficiency or comfort project anymore. It is one of the named categories insurers are required to consider when pricing wildfire risk.
IBHS Wildfire Prepared Home: a certification with real insurance impact
Beyond the state's baseline discount requirements, a growing number of California carriers recognize the Insurance Institute for Business & Home Safety's Wildfire Prepared Home certification, which evaluates a home against two tiers of wildfire hardening.
The Base tier focuses on ember protection: a Class A roof, a five-foot noncombustible zone around the home, and basic exterior maintenance. The Plus tier goes further and requires noncombustible siding, such as fiber cement, stucco, or metal, rather than untreated wood, along with covered gutters, enclosed eaves, and upgraded doors and windows. Certification requires a paid evaluation, and while discount ranges vary by carrier, some insurers report savings of up to 50 percent of the wildfire portion of a premium for certified homes.
Fiber cement siding, like James Hardie, is one of the products explicitly named as a qualifying material under the Plus standard, which is worth knowing if you are weighing a siding replacement on a home in a fire hazard zone.
Building code is a separate requirement, and it can apply even to a simple window replacement
Insurance discounts are optional. Building code compliance is not, once it applies to your project, and the two systems don't always line up the way homeowners expect.
California Building Code Chapter 7A governs materials and construction methods for buildings exposed to wildfire. It applies to new construction and to additions or alterations in a mapped fire hazard zone, and in many California jurisdictions it also applies when a homeowner replaces a “regulated element” of an existing home, including windows, even without a larger remodel. In practice, that means a straightforward, like-for-like window swap that would need no permit in most of the state can require both a permit and fire-rated glazing once a home sits inside a Very High Fire Hazard Severity Zone (VHFHSZ).
Under Chapter 7A's window and glazing standard, exterior windows generally need to meet one of the following:
- Dual-pane glazing with at least one tempered pane
- Glazing rated for 20 minutes of fire resistance
- Approved glass block meeting code thickness requirements
Skylights fall under a similar standard and generally need tempered glass or a listed fire-rated plastic glazing.
Before you assume it's a simple swap
Whether your specific project triggers these requirements depends on your home's mapped fire hazard zone, your city's local amendments to the state code, and the scope of the work. Confirm current requirements with your city's building department, or ask your contractor to check, before you assume a window replacement doesn't need a permit.
Local rules can go further than the state code
Cities in the hills above the East Bay have layered their own ordinances on top of the state requirements, and two nearby examples are worth knowing if you live in or near a fire hazard zone.
Berkeley's EMBER ordinance took effect January 1, 2026, and inspections began in May 2026. It creates a five-foot “Zone 0” around roughly 900 homes in the city's highest-risk hillside neighborhoods, including areas around Panoramic Hill, the Grizzly Peak Firebreak area, and neighborhoods bordering Tilden Regional Park. Within that five-foot zone, wooden fences can't touch the home, and mulch, dry vegetation, firewood, and other combustible items aren't allowed. The ordinance doesn't require homeowners to replace windows, roofs, or vents, but it strongly encourages dual-pane tempered windows, a Class A roof, and ember-resistant vents alongside the vegetation clearance. Property owners get 60 days to fix a violation before fines begin, escalating up to $500 per day, and the city expects to expand the ordinance to more neighborhoods over time.
Oakland's Wildfire Prevention District takes a related but different approach. New construction inside the city's Wildland-Urban Interface Fire Area must include a Class A roof, fire-resistant siding, and ember-resistant metal mesh vent covers. For existing homes, similar upgrades, including dual-pane tempered windows and fiber cement, stucco, or metal siding, are strongly recommended rather than required, though replacing a regulated element like a window can still trigger the state's Chapter 7A standard above depending on the property's zone.
California is also finalizing a statewide Zone 0 rule that would extend a similar five-foot, ember-resistant standard to homes across the state's Fire Hazard Severity Zones. Compliance is expected to begin with new construction, with a phased grace period for existing homes extending over the next several years.
None of this is legal advice, and requirements shift as cities finalize local amendments. If your home is in or near a mapped fire hazard zone, the building department for your city is the authoritative source before you pull a permit.
Which exterior upgrades are worth considering
James Hardie fiber cement siding is noncombustible and does not contribute fuel to a fire the way wood siding can, which is why it qualifies under the IBHS Wildfire Prepared Home Plus standard. For homeowners in a Very High Fire Hazard Severity Zone, replacing wood siding with fiber cement is one of the more direct ways to address a hardening requirement insurers are already asking about.
Infinity from Marvin fiberglass windows hold up to radiant heat and general wear better than aging single-pane wood or aluminum windows, and window replacement is specifically named as a home hardening measure under the Safer from Wildfires regulation. For homes with original windows from the 1960s through 1990s, replacement can address energy performance, a documented wildfire mitigation category, and, where a property sits inside a VHFHSZ, the state's fire-rated glazing standard, all in the same project.
Neither product guarantees a specific insurance outcome or satisfies every local code by default. Discount eligibility, amounts, and underwriting decisions are set independently by each insurance carrier, and code requirements are set independently by your city's building department. Homeowners should confirm both, discount eligibility with their insurance agent and permit requirements with their building department, before starting a project.
Why this matters for Bay Area hillside homes
Communities across the East Bay and South Bay, including hillside neighborhoods in Oakland, Berkeley, Orinda, Danville, Blackhawk, Los Gatos, Saratoga, and Monte Sereno, sit at least partially within Very High Fire Hazard Severity Zones. Homeowners in these areas are the most likely to see Chapter 7A permit requirements and local ordinances like Berkeley's EMBER rule apply to their property, and also the most likely to benefit from Safer from Wildfires and IBHS Wildfire Prepared Home discounts once their homes meet the qualifying standards. The two systems, code and insurance, often point toward the same upgrades even though they are enforced separately.
Why Bay Area homeowners work with Custom Exteriors
Custom Exteriors has been serving Bay Area homeowners since 1997, with more than 26,000 completed projects and over 200 five-star reviews. We are a James Hardie and Infinity from Marvin dealer, our installers are AAMA Certified Master Installers, and our company is Diamond Certified. While we are not an insurance provider or a building department and cannot guarantee coverage, discount, or permit outcomes, we can help homeowners understand which fire-resistant materials fit their home, flag when a project may fall inside a Very High Fire Hazard Severity Zone worth confirming with your city, and provide the product documentation many insurers request as part of a mitigation discount application.
Visit our Pleasanton showroom to see James Hardie siding and Infinity from Marvin windows in person, or schedule a consultation to discuss your home's specific hardening and code needs.
Frequently asked questions
Does replacing my siding actually lower my home insurance premium?
It depends on your carrier. California requires insurers that factor wildfire risk into pricing to offer discounts for specific hardening measures, including noncombustible siding, but the amount and eligibility rules vary by company. Confirm with your insurer before assuming a specific savings amount.
Is James Hardie siding fire resistant?
Yes. James Hardie fiber cement siding is noncombustible and is one of the materials recognized under the IBHS Wildfire Prepared Home Plus standard, which some insurers use to determine wildfire mitigation discounts.
Do new windows count as a wildfire mitigation measure?
Window upgrades are listed as a home hardening measure under California's Safer from Wildfires regulation, which requires insurers to offer discounts for specific mitigation steps. Ask your carrier which window specifications qualify under their field discount program.
Does replacing my windows require fire-rated glazing, or is it just a straightforward swap?
It depends on your address. Outside a mapped fire hazard zone, window replacement is typically a simple, no-permit swap. Inside a Very High Fire Hazard Severity Zone, many California jurisdictions treat window replacement as a regulated element that requires a permit and glazing that meets Chapter 7A, generally dual-pane with at least one tempered pane, 20-minute fire-rated glazing, or approved glass block. Confirm with your local building department before assuming either way.
What is Berkeley's Zone 0 or EMBER ordinance, and does it apply to my home?
It's a local ordinance, separate from the statewide Zone 0 rule, that took effect January 1, 2026 and currently applies to roughly 900 homes in Berkeley's highest fire hazard hillside neighborhoods. It requires a five-foot zone around the home free of wooden fences touching the structure, mulch, dry vegetation, and firewood, and it strongly encourages, but doesn't require, dual-pane tempered windows and a Class A roof. If your home is in the Berkeley hills, check with the city to see whether your property is currently included.
What is Zone 0 and does it apply to my home?
Zone 0 is a new statewide defensible space rule requiring an ember-resistant area within five feet of a home's foundation. It will apply to homes in State Responsibility Areas and Very High Fire Hazard Severity Zones, with a phased compliance timeline for existing homes over the next several years.
Can Custom Exteriors guarantee an insurance discount or that my project meets fire code?
No. We are not an insurance provider or a building department. Discount eligibility is determined entirely by your insurance carrier, and code compliance is determined by your city's building department. We can help you choose fire-resistant materials, flag when a project is likely to fall under Chapter 7A, and provide documentation many carriers request, but final eligibility, savings, and permit requirements should be confirmed directly with your agent and your local building department.
Ready to talk about fire-resistant materials for your home?
Schedule a consultation, or visit the Custom Exteriors showroom to see James Hardie siding and Infinity from Marvin windows in person.
2142 Rheem Drive, Suite E, Pleasanton, CA | (925) 249-2280 | custom-exteriors.com
