Window Replacement
Serving Maple Valley, Renton, Kent, Covington & Issaquah
About Our Window Replacement Services
Old, drafty windows waste energy and diminish your home's comfort. A. Sanders Construction provides professional window replacement services in Maple Valley, Renton, Kent, Covington, and Issaquah. We install energy-efficient vinyl, wood, and fiberglass windows from trusted manufacturers that reduce heating and cooling costs, block outside noise, and enhance your home's curb appeal. Our window replacement process includes careful measurement, removal of old windows, proper insulation and flashing, and precise installation that ensures a weathertight seal. We handle all styles including double-hung, casement, sliding, picture, bay, and bow windows. Every installation meets Washington state energy codes and comes with manufacturer warranties. Upgrading your windows is one of the most cost-effective home improvements — it pays for itself through lower energy bills while making your home more comfortable year-round in the Pacific Northwest climate.
What We Offer
Our Process
Free in-home window assessment and energy evaluation.
Window style and material selection with samples.
Precise measurements for custom-fit manufacturing.
Professional removal of existing windows.
Installation with proper insulation, flashing, and sealing.
Interior and exterior trim finishing and cleanup.
Project Gallery
Areas We Serve
We provide window replacement services throughout South King County, Washington.
Frequently Asked Questions
How much do replacement windows cost?
Replacement windows typically cost $400-$1,200 per window installed, depending on size, style, and material. Vinyl is the most affordable, while wood and fiberglass cost more but offer premium aesthetics. We provide free estimates for your specific window needs.
How do I know if my windows need replacing?
Signs include drafts near windows, condensation between panes, difficulty opening/closing, visible damage or rot, high energy bills, and outside noise infiltration. If your windows are over 15-20 years old, replacement is usually worthwhile.
Will new windows really lower my energy bills?
Yes. ENERGY STAR-rated windows can reduce heating and cooling costs by 10-25%. In the Pacific Northwest, high-quality windows with Low-E coatings and argon gas fill provide excellent insulation against our cool, wet climate.
Get Started on Your Window Replacement Project
Contact A. Sanders Construction today for a free, no-obligation estimate. Licensed contractor ASANDSC9210K serving South King County.