Bay Area Siding Company installs replacement windows for homes across Lower Lake and the south end of Clear Lake. We're a Marin-based siding and window contractor, and we handle each opening start to finish: measuring, glazing and energy selection, the County permit, removal, flashing and air-sealing, and a final walkthrough with you.

Ready to talk windows? Request an estimate or call (415) 619-5167.

In Lower Lake, new windows do two jobs at once

Most window projects here are solving for two things at the same time, and the right units answer both:

• Cutting summer heat. Lower Lake summers are long, hot, and intensely sunny. The single biggest comfort win from modern windows is a low solar-heat-gain coefficient (SHGC) paired with a Low-E coating — glass engineered to keep the sun's heat from pouring through south- and west-facing rooms and driving up cooling costs.
• Fire-zone glazing. Much of the land around Lower Lake sits in a high or very-high fire-hazard zone, and after the 2016 Clayton Fire burned into town, fire-resilient construction is a live concern for a lot of owners. On designated parcels, the state's wildfire code (California Building Code Chapter 7A) can require multi-paned windows with at least one tempered pane for altered openings, among other provisions.

Both point toward a well-specified dual-pane, Low-E window — the question is getting the exact glass package and tempering right for your address.

When it's time to replace

Older single-pane windows tend to make the case themselves:

• The room bakes in the afternoon no matter what the thermostat says
• Drafts or temperature swings right at the glass
• Fog or moisture trapped between the panes — a failed seal that can't be repaired, only replaced
• Sashes that stick, won't stay up, or won't latch — swollen wood, paint-sealed frames, or worn balances
• Rot, soft frames, or water staining at the sill or surround

The three decisions that matter

• Glass and energy. For this climate, prioritize a low SHGC with a Low-E coating to control heat gain, in an insulated dual-pane unit. California's Title 24 energy code sets the maximum U-factor and SHGC values a replacement window must meet, and those depend on the climate zone and the code cycle in effect — so we confirm the current numbers at permit time rather than quoting a fixed figure.
• Frame material. Vinyl, fiberglass, aluminum-clad wood, and aluminum each balance cost, thermal performance, and appearance differently. On rural and older Lower Lake homes the choice usually comes down to budget, exposure, and the look you want at the opening.
• Retrofit vs. new-construction install. A retrofit (insert) window keeps the existing frame and is less invasive; a new-construction (full-frame) install removes the window to the rough opening so the flashing and water barrier can be fully renewed — the right call where there's rot, water damage, or a fire rebuild. We do both and recommend based on what we find.

Comparing brands? Start at our window hub, then read up on Anlin, Milgard, Andersen, Marvin, and Pella. We install aluminum windows as well.

Permits in unincorporated Lake County

Lower Lake is an unincorporated community, so window replacement is permitted through the County of Lake Community Development Department, Building Division rather than a city. Window replacement is treated as an alteration under the Energy Code, so a Title 24 fenestration compliance form is part of the submittal. On a designated fire-hazard parcel, Chapter 7A's glazing provisions can apply to altered openings — and whether they do depends on the parcel and whether the work counts as a repair or an alteration. We sort that out with the County and your fire district up front, and we handle the permitting.

What affects the cost

Every job is different, so we don't post prices. The drivers on a Lower Lake project are the number and size of openings, frame material and brand, retrofit vs. new-construction, the glass package (low-SHGC and any required tempered/multi-pane fire-zone glazing), the condition of the existing framing once we open things up, and access on rural or multi-story homes.

FAQ

What kind of glass should I get for Lower Lake's heat? A dual-pane unit with a Low-E coating and a low solar-heat-gain coefficient (SHGC) is the priority here — it's what keeps summer sun from overheating south- and west-facing rooms. We match the exact package to your exposure and to Title 24.

Do my windows need to be tempered because of the fire zone? Possibly, if your parcel is designated and the work is an alteration. Under Chapter 7A, altered openings in fire-hazard areas can require multi-paned glazing with at least one tempered pane. The requirement depends on your parcel and scope, which we confirm with the County before ordering.

Do I need a permit to replace windows in Lower Lake? Yes. Since Lower Lake is unincorporated, the permit goes through the County of Lake Community Development Department, and a Title 24 energy form is part of it. We take care of the paperwork.

Retrofit or new-construction — which is right for my house? Retrofit keeps the existing frame and is less disruptive; new-construction removes the window to the rough opening so flashing can be fully renewed, which is better where there's rot, water damage, or a fire rebuild. We assess and recommend after measuring.

Get your Lower Lake windows handled

Get replacement windows sized, specced, and installed right the first time. Request an estimate or call Bay Area Siding Company at (415) 619-5167. Working on the exterior envelope too? See Lower Lake siding replacement and James Hardie siding, browse the project gallery, or explore our Lake County service area.