Many companies sell windows and doors in Seattle, but only one delivers the highest level of service, communication, responsibility, and product quality you expect and deserve.

Keystone Windows & Doors began over 20 years ago as a family-owned and operated business enterprise. We wondered: If an owner met with every customer personally, sold only top quality windows and doors, hired her own expert craftsmen to install them, and took direct responsibility for every project, would it make a difference in Western Washington?

When more customers began to refer Keystone than the business initially expected, we quickly learned what homeowners in Western Washington had been waiting for. Though the business has grown large enough to open a premier showroom in the SODO district of Seattle, we’ve maintained our business model ever since — leading with quality products, expert service and utmost responsibility.

Keystone specializes in wood, vinyl, aluminum and fiberglass windows, door retrofitting and remodeling. We’ll be your design consultant and help bring your dreams to life. Project consultations and estimates are always free. We install the best brands of custom windows and doors with the old-fashioned craftsmanship you — and the products — deserve.

We’re licensed, bonded and insured in compliance with all Washington state laws. Every job is estimated at no charge, and we’re proud to offer complimentary design consultations.

There are bigger places to buy windows and doors, but none that work harder to earn your confidence. We’d love a chance to prove it to you. Contact us for a complimentary consultation and estimate today, and ask about Keystone’s “Gold Key” lifetime warranty on labor and installation.

Serving the following communities in the Puget Sound region:

Algona

Auburn

Ballard

Beacon Hill

Beaux Arts

Bellevue

Belltown

Black Diamond

Bothell

Brier

Brighton

Burien

Cascade

Capitol Hill

Carnation

Central District

Central Waterfront

Clyde Hill

Columbia City

Covington

Delridge

Denny Regrade

Des Moines

Dunlap

Duvall

Edmonds

Enumclaw

Federal Way

Fife

First Hill

Hillman City

Hunts Point

International District

Issaquah

Kenmore

Kent

Kirkland

Lake City

Lake Forest Park

Lynnwood

Magnolia

Maple Valley

Medina

Mercer Island

Mill Creek

Milton

Mount Baker

Mountlake Terrace

Mukilteo

Newcastle

Normandy Park

North Bend

Northgate

Northwestern

Pacific

Pike Market

Pioneer Square

Puyallup

Rainier Beach

Redmond

Renton

Queen Anne

Sammamish

SeaTac

Seattle

Seward Park

Shoreline

Skykomish

Snoqualmie

Snoqualmie Pass

Tacoma

Tukwila

University District

West Seattle

Woodinville

Yarrow Point

Yesler Terrace

and more!