Bay Area Siding Company installs replacement and new-construction windows for Hayward homeowners — postwar ranch tracts on the plain, older bungalows near downtown, and hillside homes up toward the foothills. We're a Larkspur-based siding and window contractor, and we take the whole job end to end: measuring, glazing and energy selection, the City's permit and energy paperwork, removal, flashing and air-sealing, and a final walkthrough.

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

Signs your windows are ready to go

A lot of Hayward homes still run their original single-pane windows or first-generation dual-panes, and they tend to tell on themselves:

• A draft or a cold band of air off the glass with the window shut tight
• Fog or moisture trapped between the panes — a blown seal that can't be repaired, only replaced
• Sashes that stick, drop, or won't latch — swollen wood, painted-shut frames, or spent balances
• Heating and cooling bills that climb because single-pane glass has no Low-E coating
• Soft frames, rot, or water staining at the sill or the surround

If a couple of these ring true, replacing usually beats one more round of repairs.

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 units you pick have to meet the code in force at permit time — so we confirm the current numbers rather than working from memory.
• Frame material. Vinyl, fiberglass, aluminum-clad wood, and aluminum each balance cost, thermal performance, and looks differently. Older Hayward homes with wood detailing often read best with clad-wood or a profile chosen to respect the original opening, while many postwar tract homes take a clean vinyl or aluminum profile well.
• Retrofit versus new-construction. A retrofit (insert) keeps the existing frame and is less invasive; a new-construction install goes down 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, /bay-area-window-replacement/, then read up on Anlin, Milgard, Andersen, Marvin, and Pella. We install aluminum windows as well.

What to expect: our process

1. Consultation — we look at your existing windows, openings, and 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 — Hayward processes residential window/door replacements as same-day permits with a prescriptive Title 24 energy form; we complete and submit it.
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.

Hayward-specific things to know

A streamlined permit — but real requirements inside it. The City of Hayward Building Division handles residential window and door retrofit/replacement as same-day permits, which keeps the process fast. Fast doesn't mean unregulated: the submittal is tied to Hayward's "Prescriptive T-24 Energy Requirements for Residential Alterations" handout, so the windows you install have to satisfy the current energy code. We complete that paperwork as part of the job.

Tempered (safety) glazing locations. Hayward requires tempered glass in the hazardous locations the code defines — for example, glazing within two feet of a door, within eighteen inches of a walking surface, in and around stairways, and near tubs and showers. Which of your openings this touches depends on the layout, and we flag them before ordering so the right glass shows up the first time.

Egress in bedrooms. Replacement windows serving a bedroom have to preserve a compliant emergency escape opening — the code sets minimums for clear width, clear height, sill height, and net openable area. A common trap with retrofit inserts is that a smaller frame-in-frame unit can shrink the opening below the egress minimum, so we size these deliberately. Hayward's retrofit rules also expect the replacement to keep the original frame and format (a slider stays a slider, not a fixed pane), which we account for at measure.

Foothill fire zones. The eastern Hayward Hills and foothills sit within a Fire Hazard Severity Zone under the Local Responsibility Area maps the state updated in 2025, while much of the flatter city carries lower designated hazard. In designated fire-hazard areas, Chapter 7A can add glazing requirements for exterior windows — often multi-pane units with at least one tempered pane — on top of the standard energy and safety rules. Whether that applies, and exactly how, depends on your parcel and whether the work is classed as a repair or an alteration, so we confirm it during scoping.

Older housing stock. Downtown-area bungalows and the broad belt of postwar ranch homes frequently still carry their original single-pane windows, which makes the jump to a modern dual-pane, Low-E unit especially noticeable in both comfort and noise.

Working on the exterior too? We also handle siding replacement and James Hardie siding in Hayward, and we serve the wider East Bay. See finished work in our project gallery.

What affects the cost

We don't quote prices online because every job differs. The drivers are the number and size of openings; frame material and brand; retrofit versus new-construction; whether foothill fire-zone glazing applies; the condition of the existing framing, since rot repair adds scope; and access — upper-story or hillside openings need more setup.

Frequently asked questions

Do I need a permit to replace windows in Hayward? Yes, and it's streamlined — the City of Hayward Building Division processes residential window/door replacements as same-day permits, tied to a prescriptive Title 24 energy form. We complete and submit the paperwork.

Which of my windows will need tempered glass? Any in the code's hazardous locations — for instance near doors, close to a walking surface, around stairways, or by a tub or shower. We identify the affected openings before ordering so the correct safety glazing is built in.

I'm up in the Hayward foothills — do my windows have extra requirements? Possibly. In a designated fire-hazard zone, Chapter 7A can require multi-pane windows with at least one tempered pane on top of the usual energy and safety rules. Whether it applies depends on your parcel and whether the work counts as a repair or an alteration, which we confirm before ordering.

Retrofit or new-construction — which do I need? Retrofit keeps the existing frame and is less invasive; new-construction removes the window to the framing so the flashing can be fully renewed, which is better where there's rot or water damage. We also make sure a retrofit doesn't shrink a bedroom window below its egress minimum. We assess and recommend.

Get started

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