HomeImprovement.Reviews
🪟 Top 5 · 2026📍 Sunnyvale, CA

The 5 best window replacement companies in Sunnyvale.

Quieter, warmer, and the AC finally keeps up.

Chosen by our review committee · Google ratings as of November 9, 2026 · Companies cannot pay to be listed

Window Replacement Companies at work
1
Mr Window Replacement
★★★★★ 5.0 · 133 reviews

Old windows leak air, fog up and rattle. The best window replacement companies in Sunnyvale measure precisely, install with proper flashing and insulation, and stand behind both the glass and the labor.

  1. 1

    Mr Window Replacement

    🏆 Best window replacement company in Sunnyvale
    ★★★★★ 5.0· 133 Google reviews

    A 5.0 Google rating with 133 reviews behind it puts Mr Window Replacement in rare company. A solid body of feedback for a local window replacement company. Based in Fremont, it takes the top spot among window replacement companies in Sunnyvale this year.

    📍 4053 Nicolet Ave, Fremont, CA 94536
  2. 2

    GV Home Solutions

    ★★★★★ 5.0· 108 Google reviews

    GV Home Solutions holds a perfect 5.0 on Google across 108 reviews. A solid body of feedback for a local window replacement company. Based in Mountain View, it lands at #2 on our Sunnyvale list.

    📍 280 Easy St Apt 312, Mountain View, CA 94043
  3. 3

    Bull`s Glass & Screen Center

    ★★★★★ 4.9· 233 Google reviews

    Bull`s Glass & Screen Center carries a near-perfect 4.9 Google rating from 233 reviews. That many reviews is hard to fake and harder to keep that high. Based in San Jose, it rounds out the top three for Sunnyvale.

    📍 1362 S De Anza Blvd, San Jose, CA 95129
  4. 4

    Cal Coast Window & Door

    ★★★★★ 4.9· 170 Google reviews

    With 170 Google reviews averaging 4.9, Cal Coast Window & Door has earned its place here. That many reviews is hard to fake and harder to keep that high. Based in Pleasanton, it rounds out the top four for Sunnyvale.

    📍 5627 Stoneridge Dr Ste 305, Pleasanton, CA 94588
  5. 5

    American Window Specialist

    ★★★★★ 4.9· 97 Google reviews

    American Window Specialist carries a near-perfect 4.9 Google rating from 97 reviews. A solid body of feedback for a local window replacement company. Based in Campbell, it rounds out the top five for Sunnyvale.

    📍 1550 Dell Ave i, Campbell, CA 95008
How this list was made

Picked by people who read the reviews.

Our review committee researched window replacement companies serving Sunnyvale and the surrounding area, read consumer reviews across the web, and settled on these five. We look at how many people have reviewed a company, what they say, and how the company holds up over time. We keep the full recipe to ourselves so it cannot be gamed. Google ratings shown are as of November 9, 2026. No company paid to be here, and none can. More on how we choose →

Before you sign

How to hire a window replacement company in Sunnyvale

1

Compare the U-factor and SHGC ratings, not just 'energy efficient' claims.

2

Ask whether it is a full-frame or insert (pocket) replacement, and why.

3

Get the frame warranty, glass seal warranty and labor warranty in writing.

4

Be wary of high-pressure sales with 'today only' pricing.

Good to know

Window Replacement Company questions, answered

How long do replacement windows last?

Quality vinyl or fiberglass windows last 20 to 30 years. Seal failure (fogging) is the usual end of life.

Vinyl, fiberglass or wood?

Vinyl is the value choice. Fiberglass is stronger and holds paint. Wood looks best inside but needs more care outside.

How long does installation take?

A crew can often replace 8 to 12 windows in a day with insert replacements. Full-frame jobs take longer.

For the winners

On this list? Show it off. 🎖️

Paste this on your website. The badge is free and links back to this page so customers can check for themselves.

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#5 Window Replacement Company in Sunnyvale, CA 2026
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