Bay Area Siding Company installs replacement and new-construction windows across Marin City — from the hillside homes with their long views over Richardson Bay to the multifamily buildings on the flats. We're a Marin-based (Larkspur) siding and window contractor, and we run the whole job: measuring, glazing and energy selection, county permitting, removal, flashing and air-sealing, and the final walkthrough.

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

Signs your windows are due

In a marine spot like this, windows tend to fail from the outside in, and they usually tell on themselves:

• Fog or moisture trapped between the panes — a blown seal on a dual-pane unit, which can only be replaced, not repaired.
• Drafts you can feel near the glass on a windy, foggy morning even with everything shut.
• Sashes that stick, drop, or won't latch — swollen frames, worn balances, or windows painted shut over the years.
• Water staining or soft spots at the sill or surround, common where salt air and wind-driven rain have been working on a frame.
• Rooms that never quite hold their temperature because the glass is single-pane with no Low-E coating.

Two or more of these together, and replacement is usually the better long-term call than another round of patching.

What to look for in a 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 those numbers depend on the climate zone and the code cycle in effect — so rather than quote a fixed figure, we confirm the current requirement at permit time and spec units that meet it. In Marin City's cool, foggy marine climate, the payoff is mostly comfort and draft control.
• Frame material. Vinyl, fiberglass, aluminum-clad wood, and aluminum each balance cost, thermal performance, and appearance differently, and each handles salt air differently. Older hillside homes with wood detailing often look right with clad-wood or a frame profile that respects the original opening; near the bay, corrosion resistance is worth weighing.
• Retrofit vs. new-construction. A retrofit (insert) install keeps the existing frame and is quicker and less invasive. A new-construction install takes the window back to the framing so the flashing can be fully renewed — often the right move where salt-air moisture has caused rot around the opening. 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 too.

What to expect: our process

1. Consultation — we look at your existing windows, openings, and what's bothering you about them.
2. Measure — precise field measurements for every opening.
3. Product & energy selection — glass package, frame, and finish chosen to meet the current Title 24 requirement.
4. Permit — because Marin City is unincorporated, window permits go through the Marin County Community Development Agency, Building & Safety Division.
5. Removal & prep — old units out, openings inspected for rot or water damage behind the frame.
6. Install, flashing & air-seal — set level and plumb, then flashed and sealed against wind-driven rain and drafts.
7. Finish & walkthrough — trim, caulk, an operation check on every window, and cleanup with you.

Marin City-specific things to know

Your permit comes from the county. Marin City has no city hall of its own — it's unincorporated — so a window-replacement permit is issued by the Marin County Community Development Agency, Building & Safety Division (415-473-6550), and a Title 24 energy compliance form is part of the submittal. We handle the paperwork.

The marine microclimate is the design driver. Fog, wind, and salt off Richardson Bay make air-sealing and flashing the parts of the job that matter most here. A well-specced dual-pane, Low-E unit that's properly sealed makes the biggest comfort difference in exactly this kind of cool, damp, breezy setting — and corrosion-aware frame and hardware choices earn their keep near the water.

Hillside fire exposure can affect glazing. Marin City's uphill neighborhoods back onto open space, and the southern-Marin slopes carry Cal Fire hazard mapping (the state's Local Responsibility Area maps were updated in 2025). Where a fire-hazard designation applies, Chapter 7A can require exterior glazing to be multi-paned with at least one tempered pane, and the details turn on whether the work counts as a repair or an alteration. Whether any of this applies to your parcel depends on your address and scope, so we confirm it with Marin County before ordering — worth flagging early if you're on the slope.

A real mix of buildings. The single-family homes climbing the hillside and the apartment and townhome-style buildings in the flats are different window jobs — different access, different opening counts, sometimes different ownership. We scope each on its own terms, and we handle multifamily work.

Thinking about the whole exterior? We also do James Hardie siding and siding replacement in Marin City, and we serve the wider Marin area. Finished work is 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 vs. new-construction; whether hillside fire-zone tempered/multi-pane glazing is required; the condition of the framing once the old unit is out (rot repair adds scope); and access — upper-story and hillside openings take more setup.

Frequently asked questions

Do I need a permit to replace windows in Marin City? Yes. Since Marin City is unincorporated, the permit is issued by the Marin County Community Development Agency's Building & Safety Division, and a Title 24 energy form is part of the submittal. We handle the permitting.

Will new windows really make a difference in this foggy, windy climate? For comfort and drafts, yes. A properly sealed dual-pane, Low-E window is exactly what helps in a cool marine setting like Marin City — the improvement is most noticeable on the windy, foggy days.

I'm on the hillside near the open space — do my windows need to be tempered? Possibly, if a fire-hazard designation applies and the work is an alteration. In fire-hazard areas, Chapter 7A can require multi-paned glazing with at least one tempered pane. The exact requirement depends on your parcel and scope, which we confirm with Marin County before ordering.

Retrofit or new-construction — which is right for my home? Retrofit is faster and keeps the existing frame; new-construction is the better choice where salt-air moisture has caused rot and you want the flashing fully renewed. We assess each opening and recommend.

Get started

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