Fire changed how we build in the North Bay. Not the way it was talked about at industry conferences before 2017 — the way it’s been talked about after.
The Tubbs Fire, the Nuns Fire, the Kincade Fire, the Glass Fire, the LNU Complex. In a decade, wildfire moved from a background risk in Sonoma, Napa, and Marin to the single most defining constraint on how homes get sited, designed, detailed, and built. Every serious builder in the region has had to learn a body of code, material science, and site strategy that didn’t exist in this form a generation ago.
We’ve been building in the North Bay since 1982. A meaningful portion of the homes we’ve built in the last several years have been in wildland-urban interface zones — some as new construction, some as fire rebuilds for clients who lost the home before. What we’ve learned, we’ve learned through code, through collaboration with architects and engineers who specialize in this work, and through the sobering education of watching what burned and what didn’t.
Here’s what actually matters when you’re building in fire country.
California’s Chapter 7A of the Building Code — formally, “Materials and Construction Methods for Exterior Wildfire Exposure” — is the regulatory backbone of wildfire-resilient construction in the state. It applies to any new construction in a designated wildland-urban interface (WUI) zone or a state-mapped fire hazard severity zone. In much of Sonoma, Napa, and Marin counties, that’s most of where luxury clients want to build.
Chapter 7A regulates the parts of a building most vulnerable to wildfire exposure: roof assemblies, exterior walls, eaves and soffits, exterior windows and doors, decking, and vents. The requirements are prescriptive and unforgiving. Roofs must be Class A rated. Exterior walls must be ignition-resistant. Vents must be ember-resistant or eliminated entirely. Decking must meet specific fire-performance standards. Windows must be tempered or dual-pane with tempered outer panes.
For homeowners, the practical implication is that Chapter 7A affects almost every material decision on the exterior of the home. It affects cost. It affects design. And it is not optional.
For builders who work in this environment daily, Chapter 7A is a starting point, not a ceiling. Meeting code produces a compliant building. Building well beyond code — which is what the best work in this region does — produces a building that stands a real chance against the fires this landscape actually produces.
The material palette of a fire-resilient home is more limited than the material palette of a home built elsewhere, but it is not smaller in quality. Some of what shows up in the work:
Roofing. Standing-seam metal, concrete tile, and clay tile are the workhorses of Class A roofing in the North Bay. Each performs well, each carries a different weight, each contributes a different architectural language. Metal roofs have become increasingly common in contemporary wine country architecture because they combine a Class A rating with clean modern lines and long service life.
Cladding. Stucco, stone, fiber-cement, and specialty non-combustible panel systems form the core of ignition-resistant cladding in this region. Wood siding is not entirely eliminated in WUI zones — heavy timber and specific tested assemblies remain viable — but the days of standard cedar or redwood shiplap across an entire elevation are largely over in fire-prone areas.
Windows and doors. Tempered glass, dual-glazed assemblies, and steel or steel-clad frames are common in high-performance homes in this environment. Frame material matters as much as glass; vinyl and standard aluminum frames don’t perform under prolonged radiant heat the way steel and fiberglass do.
Decking. Composite decking, fire-treated wood systems, and ipe or other dense hardwoods with documented fire ratings are the primary options. Any exterior deck within a defined distance of the home now falls under Chapter 7A, and the assembly matters as much as the surface board.
Eaves and soffits. Enclosed eaves with ignition-resistant materials. Boxed soffits without vents, or with ember-resistant vents where required. Open-eave construction with exposed rafter tails, once a signature of California residential architecture, requires careful detailing to remain code-compliant and truly resilient.
Vents. Every vent is an ember pathway. Ember-resistant vents — small-mesh, tested assemblies — are now standard. Some builders and architects are increasingly eliminating traditional vents entirely in favor of unvented, well-insulated assemblies that perform better across every metric.
Concrete and stone. The materials that survive. Concrete foundations, stone accents, and masonry chimneys have become quiet signatures of homes designed to endure.
Materials alone don’t produce a fire-resilient home. Site does.
Defensible space — the buffer between the structure and the surrounding landscape — is regulated by CAL FIRE and enforced locally. Zone 0, the five feet immediately adjacent to the home, is meant to be ember-resistant: no combustible mulch, no wood fencing tied to the structure, no shrubs against the walls. Zone 1, five to thirty feet, is lean and green: irrigated plantings, trimmed trees, no accumulated debris. Zone 2, thirty to one hundred feet, is reduced fuel: managed vegetation, spaced trees, cleared ground.
For architects designing luxury homes, defensible space is often the hardest part of the project to reconcile with design intent. Clients want oaks close to the house. They want climbing wisteria on the porch. They want the pool surrounded by drought-tolerant native grasses that turn gold in summer. Almost every one of those instincts, unmediated, creates fire exposure.
The best work integrates defensible space into the design language rather than fighting it. Hardscape close to the home, functioning as both entry sequence and Zone 0 buffer. Irrigated ornamental gardens that read as intentional landscape while performing as Zone 1. Managed oak groves preserved in Zone 2 with careful thinning and undergrowth clearing. Done well, defensible space becomes part of the home’s beauty, not a compromise to it.
Site placement matters too. Ridge-top locations, romantic as they are, sit in the path of wind-driven fires. Canyon and draw locations funnel fire and heat. Slope orientation, prevailing wind direction, and vegetation type all factor into where a home should actually sit on a large parcel. On the properties we work on, these conversations happen with the architect and, ideally, a wildfire consultant well before any foundation goes in.
Post-fire forensics — the discipline of examining why some homes survived a fire that destroyed their neighbors’ — has produced a growing body of knowledge about what actually matters. Most of it is unglamorous:
Ember-resistant details at every penetration. Roof-wall intersections. Vent openings. Utility penetrations. Chimney terminations. Ember intrusion into attics and crawl spaces is one of the most common ignition pathways in wildfire loss. Sealing these details rigorously matters more than almost any single material choice.
Non-combustible zones immediately adjacent to the structure. Firewood stored against a wall. A wood gate connecting a fence to the house. A patio umbrella left up over a wooden deck. Small vectors, catastrophic outcomes.
Fire-rated garage doors and detached-structure separation. Garages and outbuildings ignite first in many losses and take the main house with them. Separation distance, non-combustible connecting elements, and fire-rated openings all matter.
Ignition-resistant landscaping and irrigation. Fine-fuel management within the Zone 0 boundary. Live plantings in Zone 1. Working irrigation systems that can be run during red-flag conditions. Some of the most fire-resilient properties in the region have integrated sprinkler systems on the exterior of the home itself — not for firefighting, but for pre-wetting during high-risk conditions.
Redundant water supply. Rural properties on wells need generator backup for pumps. Municipal-water properties benefit from on-site tank storage. During major fires, hydrant systems are often compromised or depressurized; homes with on-site water and a way to move it have real advantages.
Backup power and communication. Homes that lose power lose their well pumps, their gate operators, their smart home systems, and often their ability to know what’s coming. Generator systems, battery backup, and hardened communication all belong in the same conversation as roofing material.
Wildfire-resilient construction is a specialist discipline. It draws on structural engineering, mechanical engineering, landscape architecture, wildfire mitigation consulting, insurance expertise, and the working knowledge of a builder who has done the work through multiple code cycles and multiple fire seasons.
Homeowners planning new construction or a fire rebuild in the North Bay should expect their team to include, at minimum, an architect familiar with WUI design, a builder with recent experience in Chapter 7A construction, and a landscape professional who understands defensible space as a design discipline rather than a code exercise. In higher-risk locations, a dedicated wildfire mitigation consultant is worth the investment.
The best sign that you’re working with the right team is not what they promise. It’s what they ask. Teams who ask about your site’s fire history, your neighbors’ vegetation, your evacuation routes, your insurance carrier’s requirements, and your comfort level with residing in fire country during red-flag season are teams who understand the work. Teams who wave those questions off are teams to keep looking past.
No conversation about wildfire-resilient construction in California is complete without insurance. Coverage in high-risk zones has tightened dramatically over the last several fire seasons. Non-renewals, premium increases, and coverage caps have become common. The FAIR Plan — California’s insurer of last resort — now covers a large and growing share of properties in the North Bay.
Building to a higher resilience standard than code requires is not just a construction decision. It is, increasingly, an insurance decision. Some carriers now offer meaningful discounts for homes built to designated wildfire-hardened standards (Insurance Institute for Business & Home Safety’s “Wildfire Prepared Home” designation is one). Others require enhanced construction as a condition of coverage in high-hazard zones. Homeowners planning new construction should be in conversation with their insurance broker as early as they are with their architect.
Building in wildfire country is not an argument against building in wildfire country. The North Bay is one of the most beautiful landscapes in the world, and the homes that get built here, done well, are among the finest anywhere. But the work has changed. It requires a body of knowledge, a rigor of detail, and a coordinated team that didn’t exist in this form before the last decade of fires.
Homeowners who understand the shift — and who partner with architects, builders, and consultants who have made this discipline part of their daily practice — end up with homes that not only survive fire more often, but that read as more considered, more integrated with their land, and more architecturally resolved than homes that treat resilience as an afterthought.
Fire didn’t ruin building in the North Bay. It raised the standard.
Whether you’re planning new construction on a wildland-urban interface parcel, rebuilding after a loss, or hardening an existing home ahead of the next fire season, we’re glad to be part of the conversation. There is no single right answer for every site, but there is a right process — and it starts earlier than most homeowners expect.