Brentwood, CA

Window Replacement & Door Installation in Brentwood

Windows 4U serves Brentwood homeowners throughout East Contra Costa, from Deer Ridge and Summerset to Trilogy, Downtown Brentwood, and the newer developments along the delta waterways, with licensed, in-house window and door installation backed by a 4-year workmanship warranty.

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Your Local Brentwood Window Experts

Brentwood grew rapidly in the 2000s and 2010s, and many of those homes were built with builder-grade aluminum or vinyl windows that are now showing their age, leaking air, fogging between panes, or simply failing to block the heat of an East Bay summer. Windows 4U replaces these windows with high-performance systems from Milgard, Anlin, and other top brands, delivering real improvements in comfort and energy efficiency. We work clean, we finish fast, and you'll talk to Alex or Leon. Not a call center. Every step of the way.

What We Do in Brentwood

Window & Door Services

Every service is performed by our in-house crew. No subcontractors, ever.

Window Replacement

Retrofit and new construction window replacement in vinyl, fiberglass, and aluminum. Casement, double-hung, sliding, picture, bay & bow, all styles installed with precision and minimal disruption to your home.

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Entry Door Installation

Steel and fiberglass entry doors that improve your home's curb appeal, security, and energy efficiency. Includes full hardware installation and weatherstripping.

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Patio & Sliding Doors

Sliding glass doors and French-style patio doors for Brentwood homes with open backyard spaces and indoor-outdoor living areas. Vinyl, aluminum, and fiberglass systems available.

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Our Work

Recent Projects in the East Bay

Arched window replacement on stucco home, East Bay
Full house window replacement, East Bay
4-panel sliding door installation, East Bay
View full project gallery →
Why Brentwood Homeowners Choose Us

East Bay Experience, Licensed Professionals

Brentwood's hot summers and cool winters put real demands on windows, heat gain through west-facing windows, condensation on cold mornings, and air leakage through aging seals all add up on your utility bills. We recommend and install windows with low solar heat gain coefficients and superior insulating values for East County climates, so you get genuine energy savings, not just a cosmetic upgrade.

We serve all of Contra Costa County. Every project is run personally by Alex and Leon Elbert.

  • ✓ Energy-efficient window selection for hot climates
  • ✓ Direct communication with Alex or Leon
  • ✓ 4-year workmanship warranty + lifetime product warranty
  • ✓ Licensed, bonded & insured (CA Lic. #1097508)

Neighborhoods We Serve in Brentwood

Downtown Brentwood Deer Ridge Summerset Trilogy Delta Coves Garin Ranch Marsh Creek Vineyards

Also serving neighboring cities: Concord, Clayton, Walnut Creek, Martinez, and the wider East Bay.

★★★★★

"We bought our Summerset home knowing the windows needed replacing. Windows 4U gave us a competitive price, came out when they said they would, and did the whole house in one day. The difference in temperature in our west-facing rooms is unbelievable. Wish we'd done this years ago."

TA
Tom A.
Brentwood, CA · Yelp

Trusted Brands We Install

Milgard Alside Anlin Simonton ProVia Marvin Windsor Weather Shield
Common Questions

Window & Door FAQ

Quick answers to what we hear most. See our full FAQ →

Four steps: (1) You request a free estimate, either in-home or remote. (2) We measure, spec the right product, and send you a written quote. (3) Once approved, we order your windows or doors. Lead times are typically 3–5 weeks depending on what you ordered. (4) Installation day: our in-house crew does the work, cleans up fully, and walks through the finished job with you before we leave.
Full replacement only. We don’t repair broken hardware, re-seal leaking frames, or do glass-only swaps. If you’re not sure whether you need repair or replacement, just call us and we’ll give you an honest answer, not a sales pitch.
You can replace as few or as many as you need. One window, a few rooms, or the whole house. We take on all of it. Many customers start with the worst ones and come back for the rest later.
Yes. We can provide the product specs, color samples, and written documentation most HOAs require for window or door replacement approval. Just let us know your HOA’s requirements upfront and we’ll prepare what’s needed.
Yes, removal and disposal of your old windows and doors is included in every job. We clean up the work area completely before we leave. No pile of old frames sitting in your yard.
Never. Every installation is done by Alex and Leon’s own in-house crew. No day laborers, no strangers at your door. This is how we maintain consistent quality and stand behind our 4-year installation warranty.
A few things worth knowing upfront: we don’t do repairs of any kind (no hardware fixes, re-sealing, or patching), glass-only replacement, screen repair or re-screening as a standalone job, interior door installation, or installation of windows and doors you’ve purchased elsewhere. We do full replacement only: windows and exterior doors, start to finish.

Get a Free Estimate in Brentwood

Call, text, WhatsApp, or fill out our form. We respond fast and can often schedule your in-home estimate within a day or two.

Request Free Estimate (925) 393-3578