Your Seattle Window Replacement Specialists

Serving Builders, Contractors and Homeowners in the Greater Puget Sound region for window and door retrofit and remodeling needs. We stake our name on quality workmanship and old-fashioned attention to detail.

Contact us or visit our Seattle showroom

What Keystone Offers You

∙ Free initial design consultation for improved curb appeal

∙ Lifetime window warranties and Keystone “Gold Key” installation warranty

∙ A huge selection of top-brand vinyl, wood, woodclad, aluminum and fiberglass windows

∙ Fine-finish carpenter installers who are long-time employees, never subcontractors

∙ A Washington State woman-owned company in business since 1998