Sonoma Siding & Windows Replacement

A lot of Sonoma's housing carries decades of history in its walls — Victorians and early bungalows in the blocks around the Plaza, ranch and mid-century homes filling in the neighborhoods east and north of downtown, and older houses scattered up the valley toward the hills. When the cladding on one of those homes reaches the end of its life, a full replacement is often the honest fix. Bay Area Siding Company is a Larkspur-based (Marin) siding and window contractor working across the North Bay wine country, and we take the whole job start to finish: pulling the old material, inspecting what's behind it, correcting the weather barrier and flashing, and installing new siding to the manufacturer's spec.

Talk it through today. Request an estimate or call (415) 619-5167.

Is it time to re-side, or can this be patched?

Not every tired wall needs a tear-off. But once the problems stack up, spot repairs stop being worth it. On the older homes common in Sonoma, these are the tells that replacement is the smarter spend:

• Boards that cup, split, or flex under hand pressure — and trim you can sink a screwdriver into
• Fresh paint that blisters or peels within a season or two, no matter how well the surface was prepped
• Recurring caulk failure at joints, corners, and around windows
• Musty odor or staining on the inside of an exterior wall, a sign moisture is getting past the cladding
• Aging T1-11, hardboard, or first-generation aluminum that has simply aged out

One of these might be a repair. Several of them together usually means the wall system underneath deserves a look.

Keeping the character of an older Sonoma home

Homes in and around the Sonoma Plaza National Historic Landmark district — and the period houses that give the town its wine-country feel — are worth re-siding thoughtfully rather than generically. Modern fiber cement and engineered-wood profiles can hold the proportions of a lap-sided Victorian or a shingled bungalow far more convincingly than a stock vinyl panel, and they end the repaint treadmill that wood demands in Sonoma's hot, dry summers. If your property sits in a historic overlay or has any preservation status, tell us early; approved profiles, exposures, and finishes can be part of the conversation with the City before we spec anything.

What a tear-off actually uncovers

Layering new siding over failing material is tempting because it looks cheaper, but it seals the real questions inside the wall. Removing the old cladding is the only way to see the parts that decide whether the next twenty years go well:

• The sheathing and substrate — checked for soft spots, old water damage, and hidden dry rot, most often around window openings and along the base of the wall where water collects.
• The water-resistive barrier (WRB) — many older Sonoma homes predate modern building paper or house wrap, or have a barrier that's torn and past its job. This is the layer that keeps the wall dry, and a re-side is the moment to get it right.
• Flashing — at windows, doors, penetrations, and transitions, correct flashing matters more to long-term performance than the brand printed on the boards.

To be clear about scope: an ordinary re-side removes the cladding and exposes the sheathing, WRB, and flashing for inspection. Framing behind the sheathing only comes into play if we find damage that calls for opening it up further — which we'd walk you through before doing.

Picking a material

We install and can compare several systems in person, matched to your home's style, exposure, and budget:

• James Hardie fiber cement — noncombustible and low-maintenance; a frequent choice on valley homes with any fire exposure (see the local Sonoma James Hardie page)
• Fiber cement generally — the broader category across manufacturers
• LP SmartSide — engineered wood with a genuine wood look
• Vinyl and CertainTeed lines — where lower maintenance and cost are the priority

We also work in traditional wood siding and aluminum. On hillside and eastern-valley parcels, material choice isn't only about looks — fire exposure enters the picture, which is worth flagging up front.

The valley's fire exposure, in plain terms

Sonoma sits in genuine wine-country fire terrain. The 2017 Nuns Fire burned through the surrounding valley and hills and destroyed homes in the areas outside downtown, and in early 2025 Cal Fire's statewide update — reflected in the City of Sonoma's revised Fire Hazard Severity Zone map — expanded the High and Very High fire-hazard areas within and around the city. That history is context for the material conversation, not a construction diagnosis: being in the valley doesn't by itself mean your wall has a problem. But if your parcel carries a High or Very High designation, California Building Code Chapter 7A can govern the exterior wall covering on the regulated assemblies and openings involved in your project — generally steering you toward noncombustible or ignition-resistant materials. Whether and how it applies depends on your specific parcel and scope, so we confirm that with the City of Sonoma rather than assume it.

Permits and how the job runs

Exterior work in the city is handled through the City of Sonoma Building Division, which adopts the current California Building Standards Code (the city moved to the 2025 code edition effective January 1, 2026). Because permit and design triggers depend on scope and location, we confirm the requirements for your address as part of scoping rather than guessing.

A typical replacement runs: a walkthrough and written scope, precise measurement and material selection, permitting, tear-off with substrate inspection, WRB and flashing corrections, installation to spec, then trim, finish, cleanup, and a final walkthrough with you. Timelines depend on the home's size, the material, and whatever we find once the old siding is off.

What moves the price

We don't post prices because no two of these homes are alike. The real drivers are the home's size and number of stories, how much substrate or dry-rot repair turns up at tear-off, the material and finish you choose, access on hillside lots, whether windows or trim are being integrated at the same time, and any fire-zone assembly detailing where a parcel calls for it. An in-person look is the only way to price it honestly.

FAQ

Do I need a permit to replace siding in Sonoma? Exterior wall work generally requires a permit through the City of Sonoma Building Division, and requirements depend on your scope and location. We confirm what your specific project needs and handle the paperwork.

My home is near the Plaza and has some historic character — can you match its look? Yes. Fiber cement and engineered-wood profiles can closely reproduce the lap, exposure, and trim details of a period Sonoma home. If your property has any historic or overlay status, we factor approved profiles and finishes into the plan early.

We're on the east side of the valley near the hills. Does fire exposure change my options? It can. On parcels designated High or Very High fire hazard, Chapter 7A can apply to the regulated wall assemblies and openings, which favors noncombustible or ignition-resistant cladding. We verify your parcel's designation with the City before speccing.

How long does a re-side take? It depends on square footage, the material, access, permitting, and any substrate repair uncovered at tear-off. We give you a realistic window after we measure — we don't quote a calendar before we've seen the walls.

Get your Sonoma re-side moving

Call (415) 619-5167 or request an estimate. We'll look at the walls, talk through materials that fit your home and your parcel, and lay out the process. Browse finished work in our project gallery, see the wider wine country service area, and if windows are part of the plan, start with Sonoma window replacement.