Replacement windows in Alamo, CA

Custom Exteriors replaces windows in Alamo homes with Infinity by Marvin fiberglass windows, installed by our own full-time AAMA Certified Master Installers. We don't use subcontractors. We have served Alamo and the San Ramon Valley from Pleasanton since 1997, with 30,000+ completed projects.

Because Alamo is unincorporated, your permit comes from Contra Costa County, not a city. We handle that process for you.

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Why Alamo homes are ready for new windows

Most Alamo homes are now old enough that their original windows are past their useful life. The median Alamo home was built in 1978, and about half of Alamo's homes were built before 1980. Windows from that era are typically single-pane or early dual-pane units with aluminum or wood frames.

By now, those windows tend to show the same problems:

Heat gain. Rooms on the south and west sides get hard to cool on summer afternoons.
Failed seals. Fog or condensation between the panes of early dual-pane units.
Worn frames. Aluminum frames that conduct heat and cold, and wood sashes that stick, swell, or rot.
Drafts and noise. Gaps around old sashes let in air and sound from Danville Boulevard and I-680.

Many Alamo homes also sit on large lots with mature oaks and views toward Mount Diablo or the Las Trampas hills. The right replacement windows protect your comfort without giving up those views.

Infinity by Marvin fiberglass windows for Alamo's climate

Infinity by Marvin windows are built from Ultrex pultruded fiberglass, a material that stays stable through Alamo's hot summers and cool nights. Fiberglass expands and contracts at nearly the same rate as glass, so the seals stay tight instead of pulling away as temperatures swing.

What that means for your home:

Glass that blocks summer heat. Low-E glass packages reduce solar heat gain while keeping rooms bright, and meet California's Title 24 energy code. Learn how high-performance glass affects comfort and efficiency.
No rot, no warping. Fiberglass frames don't absorb moisture from irrigation or winter rain.
A finish that holds up. Infinity's factory finish resists fading in strong inland sun.
Made to measure. Every window is built for your opening, not pulled from a standard size chart.

Custom Exteriors is an Infinity by Marvin Platinum Partner, and Infinity by Marvin windows are the only replacement windows we install. Comparing materials? See our fiberglass vs. vinyl windows comparison and our guide to energy-efficient windows and patio doors.

Learn more about Infinity by Marvin windows

Window styles we install in Alamo

The best style depends on your home's architecture and how each room is used. Alamo's mix of ranch homes, traditional two-story homes, and custom builds calls for a range of options:

Sliding windows. A natural fit for single-story ranch homes and wide openings.
Double-hung and single-hung windows. The classic look for traditional and farmhouse-style homes.
Casement windows. A tight seal and strong airflow for catching evening breezes.
Picture windows. For framing views of Mount Diablo, the hills, or your backyard.
Awning windows. Ideal over kitchen sinks and in bathrooms.
Bay windows. Adds light and space to living and dining rooms.

Every style is on full-size display at our Pleasanton showroom, a short drive south on I-680.

Permits, HOAs, and older Alamo homes

Window replacement in Alamo requires a building permit from Contra Costa County's Department of Conservation and Development, because Alamo has no city building department. Custom Exteriors handles the permit application and County inspections as part of your project.

Two other things to plan for:

HOA approval. Many Alamo neighborhoods have homeowners associations that review exterior changes, including window style, color, and grille patterns. Check with your HOA early. We provide the product specifications your application needs.
Lead-safe work. Homes built before 1978 may have lead-based paint on window frames and trim. Custom Exteriors is EPA Lead-Safe Renovation, Repair, and Painting (RRP) Certified, and we confirm whether lead-safe procedures apply before work begins. Learn more about window replacement for homes built before 1978.

Installed by our own crews, not subcontractors

Every Custom Exteriors window is installed by a full-time employee who is an AAMA Certified Master Installer. How a window is installed decides how well it performs for decades, and it's the part many window companies hand off to subcontractors.

Our installers choose the right installation method for each opening, whether that's a retrofit into the existing frame or a full-frame replacement where the old frame is damaged. Meet the Custom Exteriors installation team, or read why employee installers vs. subcontractors matters.

Replacing windows and siding together

If your siding is also near the end of its life, replacing both at once usually gives you a better result. With the siding off, we can install windows using the new construction method and fully flash and seal each opening, which is hard to match once new siding is on the wall.

It also means one project and one crew instead of two. See our James Hardie siding page for Alamo, or read whether to replace windows and siding at the same time.

Why Alamo homeowners choose Custom Exteriors

Serving the San Ramon Valley from Pleasanton since 1997, with 30,000+ completed projects
Full-time AAMA Certified Master Installers, not subcontractors
Infinity by Marvin Platinum Partner
Diamond Certified and BBB Accredited
EPA Lead-Safe RRP Certified for pre-1978 homes
Contra Costa County permits and inspections handled for you
Backed by our product and labor warranty

See what homeowners say in our customer reviews.

Frequently asked questions

Do I need a permit to replace windows in Alamo? Yes. Because Alamo is unincorporated, window replacement permits come from the Contra Costa County Department of Conservation and Development, not a city building department. Custom Exteriors handles the permit application and inspections for you.

What are the best replacement windows for Alamo's hot summers? Look for an insulating frame and a Low-E glass package designed to reduce solar heat gain. Infinity by Marvin fiberglass frames stay stable in heat and keep seals tight, and the right glass package cuts heat coming through south- and west-facing windows. Your design consultant will recommend glass by orientation, not one package for the whole house.

How much does window replacement cost in Alamo? Cost depends on the number of windows, their sizes and styles, the glass package, and whether each opening needs a retrofit or a full-frame installation. We provide a detailed, itemized estimate after an in-home consultation. Our window cost guide explains what moves the number.

How do I know it's time to replace my windows? Common signs include fog between the panes, drafts, rooms that overheat in summer, sashes that stick, and rising energy bills. If your windows date to the 1970s or 1980s, replacement usually makes more sense than repair. See our tips on foggy windows.

Does my HOA need to approve new windows? Often, yes. Many Alamo HOAs review changes to window style, color, and grille patterns. Check your CC&Rs before you finalize your order. We supply the specifications and product details your HOA application needs.

How long does window replacement take? Installation for most homes takes one to a few days, depending on the number of windows. Because every Infinity by Marvin window is made to order, the full timeline also includes manufacturing lead time and County permit approval. Your design consultant will give you a project-specific schedule.

Ready to replace the windows in your Alamo home?

Schedule a no-pressure consultation and a design consultant will walk your home, show you style and glass options, and give you an itemized estimate. Prefer to see the windows first? Visit our showroom at 2142 Rheem Drive, Suite E, Pleasanton.

Schedule a no-pressure consultation | Visit our Pleasanton showroom Phone: (925) 249-2280

Financing options

We offer 18 months with no payments and 0% interest if the balance is paid in full within the promotional period, or 4.99% financing on approved credit. Ask about it during your consultation.

See financing details