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double hung windows


What actually drives the cost of new windows

Frame material, glass package, installation method, and installer certification move the number more than most homeowners expect. Here is what our design consultants actually walk through when they price a window replacement in the Tri-Valley, explained before you request a quote.

5 Factors That Move the Number

What drives your quote

5 factors that move the number, before you ever see a quote

Every estimate is built from the same five variables. Here's what actually moves the price on your project, and why.

  1. Frame material

    Vinyl, aluminum, and fiberglass are priced differently because they perform differently. Infinity from Marvin fiberglass costs more upfront than vinyl, but it holds its seal longer and resists the Tri-Valley's temperature swings better, so it typically needs replacing less often. Over 20 years, the math usually favors fiberglass.

  2. Glass package

    California's Title 24 energy code sets minimum performance standards, and homeowners can choose glass packages that exceed them. Higher-performance glass costs more per opening and lowers energy costs for as long as the window is in place.

  3. Full-frame replacement vs. retrofit

    Retrofit installs work within your existing frame and are typically less invasive. Full-frame replacement removes the old frame down to the studs and is often the right call when there is rot, water damage, or an outdated frame material. Your consultant will tell you honestly which one your home needs, not which one is easier to sell.

  4. Number and size of openings

    Cost scales with how many windows you're replacing and how large they are. A full-house replacement and a two-window kitchen update are different projects with different price points.

  5. Installation labor and certification

    AAMA Certified Master Installers follow a more precise, more labor-intensive installation standard than a lower-cost crew will use. That labor is part of what protects your manufacturer warranty.

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Showroom hours & location
2142 Rheem Drive, Suite E, Pleasanton, CA 94588 Mon–Fri: 8am–5pm  ·  Sat: 10am–2pm (appointments preferred) 888-611-5955

Not every home needs the same window
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Modern residential exterior highlighting expansive, energy-efficient windows with slim frames, designed to maximize natural light and enhance the home’s clean, contemporary appearance.

Here is how the options break down
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We install Infinity from Marvin fiberglass windows exclusively, not vinyl, so we will not pretend all three options are on the table with us. But you should understand where fiberglass sits in the broader market before you compare quotes from other contractors.

Vinyl: Best for Budget-focused homeowners planning a shorter hold period.

‍Fiberglass: Best for homeowners prioritizing long-term durability, seal integrity, and lower lifetime maintenance.

‍Infinity by Marvin: Best for homeowners who want maximum energy performance, a Title 24-ready glass package and a Platinum Partner-backed warranty.

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The installer is part of what you are paying for

A window is only as good as the installation behind it. How your windows go in determines whether the seal holds, the warranty is honored, and the window performs in year fifteen the way it did in year one.

AAMA (American Architectural Manufacturers Association) Certified Master Installers

AAMA certification is the highest installer credential in the window and door industry. Most installers, even experienced ones, do not carry it. Ours do. The installation has to meet the same standards the manufacturer requires to honor the product warranty.

Full-time employee installers — not subcontractors

Our installation crews are Custom Exteriors employees. They have been with our team for years, trained to our standards, and accountable to us, not to the lowest bid on a job board. You meet the same people from measure to finish.

Infinity Platinum Partner status

Custom Exteriors is Marvin's highest-tier certified installer in the Tri-Valley. That status is not automatic — it reflects installation volume, quality standards, and manufacturer review. It is also what protects your product warranty.

EPA Lead-Safe RRP Certified

Required for renovation work on homes built before 1978, common across Pleasanton, Danville, Livermore, and Walnut Creek. If your project involves full-frame replacement, this certification affects how the job is scoped and priced. Our team confirms lead-safe requirements before installation begins.

29 years at the same address

We have been at 2142 Rheem Drive in Pleasanton since 1997. If something is wrong with your installation in year three, we are still here to make it right. That kind of accountability requires staying in one place with one name for nearly three decades.

18 months — zero payments + zero interest OR 4.99% financing on approved credit
No Surprises.

Here's What the Process Looks Like.

From first contact to final walkthrough, the average window replacement project with Custom Exteriors is straightforward. Here's what to expect.

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1. Schedule a consultation
A design consultant visits your home, reviews the windows, explains your options, and answers questions, at no cost and with no obligation. We never use high-pressure tactics.
2. Visit the showroom
(Optional but recommended.) Our Pleasanton showroom at 2142 Rheem Drive has full-size Infinity from Marvin displays. You can see the weight difference, feel the frame quality, and compare finishes before committing.
3. Custom order and scheduling
Windows are ordered to your specs once you decide. Your project manager confirms the installation schedule and keeps you informed of any lead time changes before they affect your timeline.
4. Installation by our crew
Our AAMA Certified Master Installers handle the full installation. They confirm lead-safe procedures before starting on homes built before 1978, clean up completely, and do a final walkthrough with you before leaving.
Meet with a design consultant

Plan a visit to our Pleasanton showroom

Speak with a designer, see full-size window and door displays in person, and get your questions answered face-to-face. Appointments preferred.

CALL US TO PLAN A VISIT → 888-611-5955

Recognized by

When you're comparing contractors, third-party recognition gives you something to verify beyond what we say about ourselves.
Infinity by Marvin Platinum Partner badge for 2025American Architectural Manufacturers Association logo for AAMA-certified window and door installation standards.
Make It Affordable

Flexible Financing Options for Every Budget

Quality windows and doors shouldn't mean waiting years to upgrade your home. We work with trusted lending partners to help you find a payment plan that fits your budget and your timeline.

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Simple online application
Apply in minutes and get a decision quickly, without a mountain of paperwork or a trip to the bank.
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Plans for every project size
From window replacement to a full-home upgrade, flexible financing to fit the scope of your project.
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