“We needed new siding and gutters on our place outside Warrenton. A&S was the most professional of the three contractors we got quotes from — they showed up when they said they would, communicated clearly, and finished ahead of schedule. Very happy we went with them.”
Windows & Doors · Warrenton & Warren County
Windows & Doors in Warrenton, MO — energy-efficient replacements
A&S Contracting Services is a licensed, insured Warrenton contractor that replaces drafty windows and worn doors with energy-efficient Low-E units—measured, flashed, foamed, and sealed weather-tight by our own crew across Warren County. Every opening is done right, not just dropped in.
- Licensed & insured in Missouri
- Low-E double-pane efficiency
- Self-performed — no subcontractors
Know The Signs
How do you know it’s time to replace your windows?
A&S Contracting Services watches for drafts and cold spots near the glass, fog trapped between the panes, windows painted or swelled shut, and heating and cooling bills that keep climbing. Rot around the frames and sills or rattling in the wind are the final tells that a window has lost its seal and its grip on the opening.
A window that fogs from the inside is not dirty—its sealed glass unit has already failed.
Drafts & cold spots
Air leaking around the sash means the seal and weatherstripping are worn out.
Fog between the panes
Moisture trapped between the glass means the insulated seal has failed.
Painted or swelled shut
Windows that will not open have swelled, warped, or been painted into the frame.
Climbing energy bills
Single-pane and leaky windows push your furnace and AC to run overtime.
100%of the rough opening flashed, insulated, and sealed—no gaps left for drafts or water
Why It Matters
What makes A&S window installs actually last?
A&S Contracting Services measures each opening, removes the old unit, and inspects the rough frame before a new window ever goes in. We shim it dead level, flash it, foam the gaps, and seal it inside and out. A window is only as good as its install—and we self-perform every one instead of subcontracting it out.
- Measured to the opening. Every window and door is sized to its actual frame, so it sets square and operates smoothly.
- One crew, no subs. The same installers pull the old units and finish the new ones, so nothing gets lost in a handoff.
- Licensed & fully insured. Your home is open to the weather during install—our coverage protects it the whole way.
The Work
What’s included in an A&S window & door installation?
A&S Contracting Services handles the full replacement: precise measurement, removal of the old units, inspection and repair of the rough opening, level setting and shimming, flashing, foam insulation of the gaps, interior and exterior trim, and haul-away. Your new windows and doors go in weather-tight and finished across your Warrenton home, not just dropped in the hole.
Included in the scope
- Precise measure of every window and door opening
- Remove old units and haul them away
- Inspect and repair the rough opening and sill
- Set level and shim for smooth, square operation
- Flash and seal against wind-driven Missouri rain
- Foam-insulate the gaps around the frame
- Interior and exterior trim to finish the opening
How the project runs
- Measure & quoteWe measure every opening on site and review styles, glass, and door options with you.
- Written estimateYou get an itemized quote—units, count, timeline, and price, in writing.
- Remove & prepOld windows and doors come out and the rough openings are checked and repaired.
- Set, seal & trimNew units are shimmed level, flashed, foamed, trimmed, and the site is cleaned.
In Their Words
What do Warrenton homeowners say about working with A&S?
Real reviews from A&S Contracting Services customers across Warrenton and Warren County.
“These guys did a full interior renovation — drywall, trim, paint — on a room addition at our house near Wright City. Great craftsmanship, clean job site every day, and they handled everything themselves without subbing it out. Will absolutely hire again.”
“We replaced the soffit and fascia on our older farmhouse and A&S matched everything perfectly to the existing roofline. The estimate was detailed and exactly what we paid. No surprises, no upselling. That kind of straightforward work is hard to find.”
5-Star Google Rated
Licensed & Insured
Energy-Efficient Glass
The Difference
Why not just buy windows from a big-box store?
A&S Contracting Services often gets called to fix big-box window jobs where the install was farmed out to a rotating subcontractor. The glass may be fine; the leak comes from an opening that was never flashed or sealed right. We measure, install, and seal every unit ourselves, so the warranty and the weather-seal both hold up.
Big-box subcontracted installs
- Builder-grade units and a rotating install crew
- Install subcontracted to the lowest bidder
- Gaps foamed over without proper flashing
- No one accountable when a draft or leak shows up
A&S Contracting Services
- Quality units matched to your home and budget
- Measured and installed by our own crew
- Flashed, foamed, and sealed weather-tight
- One local contractor standing behind the work
Good Questions
Still have questions about windows & doors?
Are replacement windows really worth the cost?
For most Warrenton homes with drafty or fogged windows, yes. A&S Contracting Services installs Low-E double-pane units that cut the drafts driving your heating and cooling bills up through Missouri winters and summers. Beyond the energy savings, sealed windows that open and lock easily add real comfort and resale value—and a proper install is what makes those savings actually show up.
What does it cost to replace windows in Warrenton?
Window cost depends on the number of openings, the style and glass package, and whether any rotted framing or sills need repair. A&S Contracting Services measures every opening on site and gives you a written, itemized estimate, so you know the count and the price before any old window comes out—no round-number phone quotes.
Can you replace an entry or patio door too?
Yes. A&S Contracting Services installs exterior entry doors, sliding and patio doors, and storm doors along with windows. Doors take the same care as a window—square framing, proper flashing, shimming, and a weather-tight seal—so they swing true, latch cleanly, and keep drafts and rain out of your Warren County home.
What kind of glass do you install?
A&S Contracting Services installs energy-efficient Low-E double-pane glass on most window replacements, in double-hung, casement, slider, and picture styles. The Low-E coating reflects heat back where you want it—out in summer, in during winter—which is exactly what a Missouri climate with hot Julys and cold Januarys demands.
How long does a window replacement take?
Most whole-house window replacements around Warrenton take one to two days once the units arrive, depending on the number of openings and any framing repairs. A&S Contracting Services runs its own crew, so the same installers pull the old windows, prep the openings, and finish the trim—your home is not left open to the weather overnight.
Do you handle the trim and cleanup after install?
Yes. A&S Contracting Services finishes the interior and exterior trim, seals and caulks every opening, hauls away the old windows and doors, and cleans up the work area before leaving. A window job is not done when the glass is in—it is done when the opening is trimmed, sealed, and the site is left clean.
Recent Work
What recent window and door projects has A&S completed near Warrenton?
These are real window and door projects A&S Contracting Services self-performed across Warrenton and Warren County—each one handled start to finish by the same in-house crew, never a subcontractor.
What We Do
What else can A&S handle on your home?
New windows and doors often go in alongside other exterior upgrades. A&S Contracting Services also self-performs the siding, exterior work, and roofing that finish the look and seal of your Warrenton home under one licensed roof.
Siding
High-quality siding installation and repair to enhance your home's curb appeal and weather protection. We offer a variety of materials and styles to match your home's aesthetic.
Siding installation & repair in WarrentonExterior Work
Complete exterior construction and renovation services including siding, roofing, and landscaping integration. Protect and enhance your home's outdoor appearance.
Exterior home renovation in WarrentonRoofing
Professional roofing installation, repair, and replacement services for residential and commercial properties. Our experienced team ensures quality craftsmanship and long-lasting protection for your home.
Roof repair & replacement in Warrenton
Free Estimate
Ready to close the drafts for good?
Send the details and A&S Contracting Services will reply the same day to schedule your free on-site window and door measure.
What Happens Next
What happens after you request an estimate?
Windows and doors across Warrenton, Wright City, Foristell, Wentzville, Troy, Jonesburg, Washington and everywhere within 50 miles.