Sliding Glass Doors
Two- and three-panel slider systems with slim modern frames in aluminum, vinyl, or wood-clad construction. Smooth-glide tracks rated for decades.
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East Bay's Premier Door & Window Installer
Where your home meets the horizon.
Premium sliding glass doors, multi-slide walls, French doors, and replacement windows — built to last decades. Serving every city in Contra Costa & Alameda County since 2014.
4.9★ 127 Google Reviews
1,800+ Installations
10-Year Warranty
$2M Insured
Free In-Home Estimate
Tell us about your project.
We respond within one business day. No pressure, no hard sell — just a clear, itemized plan for your home.
- Free in-home consultation & measurement
- Itemized written quote, no surprises
- Licensed, insured, 10-year labor warranty
- Local crews, never subcontracted
- Marvin, Andersen, Western Window, LaCantina
Prefer to talk? Call (925) 555-0123
What We Install
Doors and windows that frame your life
From a single replacement panel to a full wall of multi-slide doors opening to your backyard, we handle every project with the precision of custom craftsmanship.
Multi-Slide Systems
Full walls of glass that retract completely into a pocket — open up to four panels of true indoor-outdoor living. Premium brands: Western Window, LaCantina, Fleetwood.
Learn more →French Doors
Hinged double-door systems for traditional homes, with stained-glass options and architectural hardware in brass, matte black, or brushed nickel.
Learn more →Pocket Doors
Sliding panels that disappear into the wall — modern, minimal, and a space-saver for tight floor plans. Custom-engineered for new builds and remodels.
Learn more →Window Replacement
Whole-home window replacement and individual unit replacement. Energy-efficient dual- and triple-pane glass, soundproofing options, custom shapes.
Learn more →Custom Fabrication
Architects' specs, historic restorations, oversized openings — we work with custom fabricators when off-the-shelf won't do. Bring us your blueprints.
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Where We Work
Serving the entire East Bay
Free in-home estimates across every city in Contra Costa and Alameda County. Click any pin to view local details.
20 cities served across the East Bay — free in-home estimates anywhere on the map.
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Contra Costa County
What Our Clients Say
Trusted by 1,800+ Bay Area homes
★★★★★
"Horizon installed a four-panel multi-slide in our Danville remodel. Crew was meticulous, finished a day early, and the result is the heart of our home now. Worth every dollar."Jennifer M. Danville, CA
★★★★★
"Replaced 14 windows in our Berkeley craftsman. They matched the original profiles perfectly and the energy bill dropped 30% the first month. Real professionals."David & Akiko R. Berkeley, CA
★★★★★
"After three estimates from other companies, Horizon was the only one who actually understood our 1920s house. They proposed a solution none of the others did. Hired on the spot."Michael H. Walnut Creek, CA
Frequently Asked
Questions, answered.
How much does a sliding glass door installation cost in the Bay Area?
A standard two-panel sliding glass door installation in Contra Costa or Alameda County typically ranges from $3,500 to $8,500 installed, including premium-brand product, labor, and disposal. Multi-slide and pocket-door systems range from $9,000 to $35,000+ depending on size, glass specification (dual-pane vs. triple-pane, low-E coatings, laminated for sound), and frame material (aluminum, fiberglass, wood-clad). Every Horizon estimate is itemized so you see exactly what you're paying for.
How long does a typical installation take?
Most standard sliding-door installations are completed in one day. Multi-slide systems and installations requiring structural modification (header changes, framing) typically take two to four days. Whole-home window replacement projects (10+ openings) usually take three to five days. Horizon provides exact timelines during the free in-home estimate.
Are you licensed and insured?
Yes. Horizon holds the appropriate California contractor licensing for door and window installation, carries $2M general liability insurance, and is fully workers' comp insured. License and insurance certificates are provided with every estimate — and you can verify our license directly with the California Contractors State License Board (CSLB).
What brands do you install?
Horizon is an authorized installer for premium brands including Marvin, Andersen, Pella, Western Window Systems, LaCantina, Fleetwood, Milgard, and Jeld-Wen. We can also work with custom local fabricators for historic restorations or oversized openings. Brand selection happens during the estimate based on your home, climate exposure, budget, and aesthetic preferences.
Do I need a permit for door or window replacement?
In Contra Costa and Alameda County, like-for-like window or door replacements typically do not require a permit. Permits are required when you change the size of the opening, modify structural framing, or add a new opening (for example, converting a window to a sliding door). Horizon handles all permit applications and inspections as part of our service when permits apply.
What's the warranty on your installations?
Horizon backs every installation with a 10-year labor warranty. Product warranties are passed through from the manufacturer (most premium brands offer 10–20-year glass and frame warranties). If anything goes wrong with the install — a leak, an alignment issue, hardware failure — we come back and make it right at no charge for the first 10 years.
Can you replace a sliding door with French doors (or vice versa)?
Yes — this is one of our most common projects. Converting between door types may require structural changes to the rough opening (especially when going from a smaller window to a wider door, or from French to multi-slide). Horizon includes any required framing, drywall repair, exterior finish patching, and permit-pulling in our quotes so you have one all-in price.
Do you serve all of Contra Costa and Alameda County?
Yes. Horizon serves the entire East Bay: Walnut Creek, Concord, Danville, San Ramon, Pleasant Hill, Lafayette, Martinez, Pittsburg, Antioch, Brentwood, Berkeley, Oakland, Fremont, Pleasanton, Livermore, Dublin, Hayward, San Leandro, Alameda, Union City, and every community in between. Free in-home estimates anywhere in our service area.