Alamo, CA

Window Replacement & Door Installation in Alamo

Windows 4U serves Alamo homeowners throughout this upscale unincorporated community, from Stone Valley and Round Hill to Westside Alamo, Livorna Heights, and the horse properties along the ridgelines, with licensed, in-house window and door installation backed by a 4-year workmanship warranty.

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Your Local Alamo Window Experts

Alamo is one of the most sought-after unincorporated communities in Contra Costa County, large lots, custom homes, horse properties, and a level of care and investment that requires a contractor who matches that standard. Windows 4U has completed numerous projects in Alamo, working on custom homes where quality, discretion, and attention to detail are non-negotiable. Alex and Leon Elbert are at every job personally, and they bring the same craftsmanship to an Alamo estate that they bring to every project they take on.

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 Alamo's custom homes, connecting indoor living spaces to pools, gardens, and hillside views. Vinyl, aluminum, and fiberglass systems available.

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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 →

Custom Home Expertise, Licensed Professionals

Alamo homes are not cookie-cutter, they're custom-designed properties that require a contractor who can work to that standard. We're experienced on large homes with complex window configurations, architectural window shapes, and premium product specifications. Since Alamo is unincorporated, permits are pulled through Contra Costa County Building Department, and we handle that process when required. We bring fiberglass, premium vinyl, and aluminum options to suit any architectural style.

We're minutes away in Walnut Creek. Alex and Leon are on every job site. No crews you've never met.

  • Experience on large, custom-built homes
  • Premium fiberglass and vinyl window options
  • Direct communication with Alex or Leon
  • 4-year workmanship warranty + lifetime product warranty
  • Licensed, bonded & insured (CA Lic. #1097508)

Neighborhoods We Serve in Alamo

Stone Valley Round Hill Westside Alamo Livorna Heights Rancho Paraiso Alamo Oaks Miranda Avenue Corridor

Also serving neighboring cities: Walnut Creek, Danville, Pleasant Hill, Concord, and the wider East Bay.

★★★★★

"We have a large home in Stone Valley with 22 windows across multiple levels. Windows 4U was the only contractor who gave us a detailed, honest assessment and actually showed up on time with a crew that knew what they were doing. Finished in two days, no mess, no drama. Outstanding."

RG
Robert G.
Alamo, CA · Yelp

Trusted Brands We Install

Milgard Alside Anlin Simonton ProVia Marvin Windsor Weather Shield

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 Alamo

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