Gilroy Siding & Windows Replacement

Gilroy summers are long, dry, and genuinely hot, and it shows up first on a home's exterior. South- and west-facing walls take a hard UV load season after season, and cladding that has cycled through years of that heat tends to fade, chalk, cup, or pull at its fasteners before anything else on the house does. If your walls are telling you they're done, Bay Area Siding Company replaces them properly — we're a Larkspur-based (Marin) siding and window contractor working throughout the South Bay, and we take the job from tear-off through weather barrier, flashing, and final install.

Want a straight assessment of your walls? Request an estimate or call (415) 619-5167.

When a re-side beats another repair

Plenty of Gilroy homes can get a few more years out of a caulk-and-paint round. Others are past it, and the tell is usually that the same problems keep coming back. A few patterns that point to full replacement rather than another patch:

• Paint that blisters or peels within a season or two on the sunny elevations, no matter how well it was prepped
• Boards or panels that have cupped, split, or opened at the joints from repeated heat expansion and contraction
• Soft spots, spongy trim, or fastener heads backing out where the material has fatigued
• Older T1-11, hardboard, or aluminum that's simply reached the end of its service life
• Any sign of moisture behind the cladding — staining, a musty edge to a wall, or paint that lifts in one recurring spot

One or two of these on their own may be a repair. Several of them together, especially on the elevations that bake all afternoon, usually mean the wall system needs to come off and start over.

What tearing off actually lets us do

The reason full replacement is worth it isn't the new boards — it's everything the tear-off exposes. Once the old cladding is removed down to the sheathing and substrate, we can see the water-resistive barrier (WRB) and the flashing at windows, doors, and penetrations, and confirm whether they're intact or were never detailed correctly in the first place. On a lot of older Gilroy homes those layers predate modern standards. Siding over the top of failing material skips that inspection entirely, adds weight, and can trap moisture against the wall. Taking it back to the substrate is the only way to hand you a wall that's sound underneath, not just fresh on the surface.

Picking a material that can take the heat

Material choice matters more here than in a mild coastal town, because whatever goes on those walls has to hold color and dimension through real summer heat. We install several systems and will walk the trade-offs with you on-site:

• James Hardie fiber cement — noncombustible fiber cement with a factory finish that resists UV fade well; see the Gilroy James Hardie page for the product detail
• Fiber cement generally — the broader category across manufacturers
• LP SmartSide — engineered wood, when a warmer wood look is the goal
• Vinyl siding — a lower-maintenance option where the exposure and detailing suit it

We also work with CertainTeed, wood, and aluminum. If your parcel sits up against the hills that ring the city, material also becomes a fire-code question — more on that below.

Permits and the wildland edge

Exterior work in Gilroy runs through the City of Gilroy Building Division, which enforces the current California Building Standards Code (the city adopted the 2025 code cycle) and issues the permits for this kind of alteration. We pull and manage that permit as part of the job rather than leaving it to you.

Gilroy's flat valley core is mostly ordinary from a fire-code standpoint, but the hills and grassland edges that wrap the city — the wildland margins toward the western foothills and out east toward Henry W. Coe — carry designated Fire Hazard Severity Zones, and the City adopted Cal Fire's updated 2025 maps in June 2025. If your home is on or near one of those edges, California Building Code Chapter 7A can govern the exterior wall covering, generally steering the material toward noncombustible or tested ignition-resistant assemblies. Whether it applies to your specific parcel and scope isn't automatic — it depends on the mapped designation and the work involved — so we confirm your address against the City's current maps before speccing anything, rather than assuming either way.

What moves the price

We don't post prices because no two re-sides are the same. On a Gilroy home the real cost drivers are the size and number of stories, how much substrate repair turns up once the old cladding is off, the material and finish you choose, whether windows or trim are being integrated at the same time, and whether a hillside parcel brings fire-zone assembly requirements into play. A walkthrough is the only honest way to put a number on it.

FAQ

Do I need a permit to replace siding in Gilroy? Exterior alteration work is permitted through the City of Gilroy Building Division, which enforces the California Building Standards Code. We confirm the exact requirement for your scope with the Building Division and handle the permitting for you.

My house is near the hills — does that change my siding options? It can. Parcels in or near Gilroy's designated Fire Hazard Severity Zones may fall under California Building Code Chapter 7A, which favors noncombustible or ignition-resistant wall coverings. We check your parcel against the City's adopted maps before recommending a material.

Can I just re-side over what's there? We generally advise against it on older homes. Covering over hides the sheathing, WRB, and flashing — exactly the layers that need inspecting — and can trap moisture. A full tear-off costs more up front but is the only way to correct what's underneath.

How long does a replacement take? It depends on the home's size, the material, how much repair shows up at tear-off, and permit timing. We give you a realistic schedule once we've measured and looked at the walls.

Get your Gilroy re-side moving

Call (415) 619-5167 or request an estimate. We'll look at your walls, talk through materials that hold up to Gilroy heat, and lay out the process. Doing the openings too? See Gilroy window replacement. You can also browse finished work in our project gallery or the wider South Bay service area.