Window Installation in St. Louis, MO | Atlas General Contracting
Energy-Efficient Window Installation Across the St. Louis Metro
Old single-pane or failed insulated windows can leak a quarter of your home's heating and cooling — a painful bill in both St. Louis summers and winters. Atlas General Contracting installs energy-efficient replacement windows from Andersen, Pella, Marvin, and other top manufacturers.
Professional Windows Services in the St. Louis Metro
We specialize in insert (pocket) and full-frame replacements, depending on the condition of your existing window frames. Vinyl, fiberglass, and clad-wood options are all available. Every install includes proper flashing, low-expansion foam insulation, and interior trim work — the details that separate a 20-year window install from a 5-year one.
Double-hung, casement, sliders, bay windows, and picture windows are our most common installs. We also handle full custom orders for historic St. Louis homes where matching trim profiles and window sizes matters.
Most full-home St. Louis window replacements are completed in 1-3 days. We protect interior flooring, vacuum as we go, and handle disposal of old units as part of the contract.
What's Included With Our Windows Services
Every windows project is backed by 45+ years of local craftsmanship and a family-owned reputation we can't afford to lose.
Andersen, Pella, & Marvin Dealers
Full-service installation of top-tier replacement windows with transferable warranties.
Insert & Full-Frame Replacement
We pick the right install method based on the condition of your existing frame — not a one-size-fits-all sales pitch.
Energy-Efficient Glass Packages
Low-E coatings, argon fills, and warm-edge spacers that meet or exceed Energy Star for Missouri.
Historic Home Matching
Custom sizing and simulated divided lites for older St. Louis neighborhoods where appearance matters.
Windows Service Areas Across the St. Louis Metro
We serve homeowners and businesses across the entire St. Louis metropolitan area. Click your city for local project examples and neighborhood-specific details.
Windows FAQs for St. Louis Homeowners
How much do replacement windows cost in St. Louis?
Are insulated windows worth it in Missouri?
How long does a full-home window replacement take?
Do you handle historic St. Louis homes?
Explore Other Construction Services
We're a full-service general contractor. Bundling projects often saves money and simplifies scheduling.
Ready to Start Your Windows Project?
Free in-home estimates. Written proposals. No obligation. Talk to a third-generation St. Louis contractor who actually answers the phone.