Bay Area Siding Company replaces and installs windows for Fremont homeowners — from the slim-profile openings of the valley-floor Eichler and mid-century tracts to foothill homes near Mission Peak where fire-area glazing rules come into play. We're a Larkspur-based siding and window contractor covering the East Bay, and we run the whole job: measuring, glass and frame selection, permitting, removal, flashing and air-sealing, and a final walkthrough.

Ready to move forward? Request an estimate or call (415) 619-5167.

Signs it's time to replace

Plenty of Fremont homes are still running their original windows — single-pane aluminum sliders in the postwar tracts, wood sash in the older districts. They usually let you know:

• Drafts you can feel at the glass with the window latched shut
• Fog or moisture trapped between the panes — a blown seal on a dual-pane unit, which can't be repaired, only replaced
• Sashes that bind, drop, or won't lock — swollen wood, painted-shut frames, or spent rollers and balances
• Heating and cooling bills driven by uncoated single-pane glass
• Soft frames, staining, or rot at the sill or surround

Two or more of these usually means replacement is the better long-term move than one more round of patching.

Choosing the right replacement window

Three decisions carry most of the weight:

• Energy performance. Aim for dual-pane insulated glass with a Low-E coating. California's Title 24 energy code sets maximum U-factor and SHGC values for replacement windows, and the numbers shift by climate zone and code cycle — so rather than quote fixed figures, we confirm the values in force at permit time and spec to them. Fremont's inland summers make solar-control glazing worth a real look.
• Frame material. Vinyl, fiberglass, aluminum-clad wood, and aluminum each balance cost, thermal performance, and looks differently. On a Fremont Eichler or mid-century home, the original openings are often tall and narrow with minimal sightlines, so a slim-profile frame that keeps the glass area generous matters more here than on a heavier traditional home.
• Retrofit vs. new-construction. A retrofit (insert) install keeps the existing frame and is less invasive; a new-construction install strips back to the framing so the flashing can be fully renewed — the right call where there's rot or water intrusion. We do both.

Comparing brands? Start at our window hub, then dig into Anlin, Milgard, Andersen, Marvin, and Pella. We install aluminum units too.

What to expect: our process

1. Consultation — we look at your existing windows, the openings, and your goals.
2. Measure — precise field measurements for every opening.
3. Product and energy selection — glass package, frame, and finish chosen to meet Title 24.
4. Permit — we file the right City of Fremont permit for your scope (see below).
5. Removal and prep — old units out, openings checked for rot or damage.
6. Install, flashing, and air-seal — set level and plumb, then flashed and sealed against water and air.
7. Finish and walkthrough — trim, caulk, an operation check, and cleanup with you.

Fremont-specific things to know

Permits — and Fremont's express option. The City of Fremont requires a permit to replace windows, but it offers a streamlined path many homeowners qualify for: an express Residential Window Replacement permit, applied for online and issued automatically, for projects that don't remove or alter any framing. Change an opening's size, add a new opening, or hit structural framing and the job moves to a standard building permit with review instead. A Title 24 energy compliance form is part of the submittal either way. We match your project to the correct path and handle the filing.

Foothill fire-area glazing. Homes on Fremont's eastern edge — the slopes near Mission Peak and Mission San Jose — fall in the city's designated fire hazard severity zones, and Fremont has adopted the 2025 California Wildland-Urban Interface Code (Ordinance 12-2025) along with a local Fire Hazard Severity Zone map (Ordinance 10-2025). In the interface, exterior glazing generally has to be multi-paned with at least one tempered pane, among other requirements. Whether that reaches your project depends on your parcel's designation and whether the work counts as a repair or an alteration — so it's worth confirming early, which we do as part of scoping. On the valley floor, these provisions typically don't apply.

Eichler and mid-century stock. A large share of Fremont's flat-land housing is postwar and Eichler-era, with expansive glass and thin original frames. Swapping tired single-pane units for a modern dual-pane, Low-E window is a comfort and efficiency jump you notice immediately — the trick is picking a frame that respects those clean, slim sightlines instead of fattening them up.

Working on the whole envelope? We also do siding replacement and James Hardie siding in Fremont, and we serve the wider East Bay. Browse finished work in our project gallery.

What affects the cost

We don't quote online because every job differs. The drivers are the number and size of openings, frame material and brand, retrofit vs. new-construction, whether foothill fire-area tempered/multi-pane glazing is required, the condition of the existing framing (rot repair adds scope), and access — upper-story openings take more setup.

Frequently asked questions

Do I need a permit to replace windows in Fremont? Yes. Fremont requires a permit, but many like-for-like replacements that don't touch framing qualify for the city's express Residential Window Replacement permit, issued automatically online. Jobs that alter or add framing need a standard permit. A Title 24 energy form is part of the submittal, and we handle the filing.

I'm up near Mission Peak — do my windows need to be tempered? Possibly, if the work is an alteration in the fire area. In Fremont's designated fire zones, exterior glazing generally must be multi-paned with at least one tempered pane. The exact requirement depends on your parcel and whether the work is a repair or alteration, which we confirm before ordering.

Can I keep the slim look of my Eichler or mid-century windows? Yes. Frame material and profile can be chosen to preserve narrow sightlines and maximize glass area, so the upgrade doesn't visually bulk up the original openings.

Retrofit or new-construction — which do I need? Retrofit is less invasive and keeps the existing frame; new-construction is better where there's rot or water damage and you want the flashing fully renewed. We assess and recommend.

Get started

Get your Fremont windows sized, specced, and installed right the first time. Request an estimate or call Bay Area Siding Company at (415) 619-5167.