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Window Replacement in St. Louis, MO

Storm Guard has replaced windows across Southwest St. Louis for more than 20 years, from century homes in Webster Groves to 1960s ranches in South County. If your windows sweat, stick or let the winter through, book a consultation and we will tell you plainly whether they need service or replacement.

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Anonymous man installing window in room
Anonymous man installing window in room

Window Replacement Built for St. Louis Temperature Swings

St. Louis asks a lot of a window. A single year can swing from single digits in January to high nineties with heavy humidity in July, and that expansion and contraction is what eventually breaks the seal between panes. That is why we size and install for movement, use insulated glass suited to a mixed-humid climate, and flash the opening properly instead of relying on caulk. Storm Guard is the same local roofing contractor your neighbors call for hail work, so if the storm hit your siding and your windows at the same time, one crew handles both.

Repair or Replace: How We Decide

Not every failing window needs replacing. Hardware, balances, weatherstripping and glazing can often be repaired, and on older wood windows in Kirkwood or Webster Groves that is frequently the better call for both cost and character. Replacement makes more sense when the frame is rotted, the seal between panes has failed, or the unit no longer operates safely as an egress window. We walk the house, show you what we find, and give you both numbers so the choice is yours.
two workers installing window

Six Signs Your St. Louis Windows Need Attention

Drafts you can feel, or daylight visible at the frame

Cracked or chipped glass, often after a hail or wind event

Soft or rotting wood frames and sills from trapped moisture

Loose or failing locks, hinges, balances and cranks

Rust or corrosion on metal frames and hardware

Fog or condensation trapped between the panes

CERTIFICATIONS & AFFILIATIONS

Not Sure Which You Need? Get It Assessed First

Our window specialists assess the condition of your windows, the frames around them and the flashing behind them, then explain what is actually failing. Sometimes it is a twenty dollar balance. Sometimes the seal is gone and no repair will bring back the efficiency. You get a written scope either way, and if hail was involved we document it for your claim alongside the roof inspection.

Quality roofing workmanship

Trusted Workmanship, Proven Over Time

Lasting quality is never an accident. With over two decades of experience, Storm Guard applies proven practices and trusted materials to every project.
  • No Shortcuts - Each installation is carried out with precision and care.
  • Materials that Matter - We rely on products selected for durability and long-term value.
  • Experienced Guidance - Our trained teams and project managers bring clarity to every step.
  • Tailored Solutions - We adjust our approach to the specific needs of your home.
  • Respect for Your Home - We leave each site clean and cared for, as if it were our own.
OUR REVIEWS

WHAT OUR CUSTOMERS SAY

FREQUENTLY ASKED QUESTIONS

Most St. Louis window replacements land between roughly 450 and 1,200 dollars per window installed, with vinyl double-hung units at the lower end and large casement, bay or custom wood-clad units well above it. Price moves with frame material, glass package, opening size and whether the surrounding trim and flashing need rebuilding. Whole-house projects on a typical three-bedroom home commonly run into the low five figures. We quote per opening so you can phase the work, replacing the worst elevation first rather than the whole house at once.

Yes. St. Louis hail regularly cracks glass, pits vinyl and aluminum frames, tears screens and damages window wraps and trim, and that damage is generally covered under the same wind and hail claim as your roof. The catch is that adjusters often scope the roof and miss the windows, especially on the elevation that took the hail. We photograph every elevation, including frames and screens, so the full loss is documented. Missouri law leaves the negotiation to you and your insurer, so we supply evidence rather than argue the claim.

Yes, and they are two separate warranties worth understanding. The manufacturer covers the window itself, typically material defects, glass seal failure and frame issues. Storm Guard covers the installation with a written workmanship warranty. Before we start, we go through what is covered, how long it lasts and how to make a claim, and we keep your paperwork on file so you are not digging through a drawer in eight years.

Straightforward like-for-like window replacement usually does not require a permit in most Southwest St. Louis jurisdictions, but there are real exceptions. Enlarging an opening, changing an egress window, or altering the structure generally does require one. Properties inside a City of St. Louis historic district can need review even where the building code would not require a permit. Requirements vary by municipality, so we confirm with your city or county before we order, and we tell you if a permit is needed rather than leaving you to find out.

Most St. Louis homes are done in one to two days once the windows arrive, with each standard opening taking roughly 45 minutes to two hours. The waiting is in the manufacturing, typically two to six weeks for standard sizes and longer for custom or wood-clad units. We measure, order and only then schedule installation, so your house is not open to the weather while we wait on a shipment. If a storm damaged the opening and it cannot wait, we can board up or tarp the opening in the meantime.

EXTERIOR CONFIDENCE

A well-informed decision starts with a clear understanding of your property. Our experienced team will carefully evaluate your home’s exterior, explain what we find, and provide straightforward recommendations tailored to your needs. With thoughtful guidance, you’ll know exactly how to move forward with confidence.
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Unless otherwise noted, each use of "Storm Guard," “us,” “we,” or “our” throughout Stormguardrc.com collectively refers to both the Storm Guard brand and the Storm Guard Franchise System, which is made up almost exclusively of independently owned and operated franchise locations.