Siding
High-quality siding installation and repair to enhance your home's curb appeal and weather protection.
- Vinyl, fiber cement & wood options
- Energy-efficient insulation backing
- Storm & impact-rated selections
Warrenton, MO — Warren County
Windows & Doors
Windows & Doors
Installed Right in Warrenton, MO
A&S Contracting Services installs replacement windows and new doors on homes throughout Warrenton, MO and Warren County. From energy-efficient double-pane replacements to new entry and patio doors — we handle the full install with written estimates, licensed crews, and clean jobsites.
Licensed & Insured
Free Written Estimates
ENERGY STAR Options
Old windows are Missouri's most overlooked energy drain — and drafty doors are a security and comfort problem hiding in plain sight every winter.
Condensation between panes
Fogging between glass layers means the insulating seal has failed and argon or krypton gas has escaped. This unit cannot be resealed — the insulated glass unit needs replacement to restore thermal performance.
Drafts around frames or doors
A lit candle held near a window frame on a windy day tells the story — flickering means infiltration. On doors, visible daylight at the threshold or frame edges means your weatherstripping has failed or the door has shifted.
Windows that won't open or lock
Vinyl frames warp over time; wood frames swell and rot. When sashes stick or latches no longer seat properly, the window is both a ventilation problem and a security issue — both reasons to replace.
Higher heating and cooling bills
Single-pane windows and aged double-panes are responsible for up to 30% of home heating and cooling loss. Warrenton's climate — hot summers, cold winters — makes this especially impactful on monthly utility costs.
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Estimate cost — written quote on every project
Estimate cost — written quote on every project
- Rough opening assessment before you commit. We measure existing openings and check for frame rot, moisture intrusion, and structural issues before quoting — so your project price is accurate before a single window is ordered.
- Full removal and disposal included. Old windows and doors are removed and hauled off-site as part of the installation — you're not left with a pile of glass and framing to deal with after we leave.
- Interior and exterior finishing included. Trim, casing, and flashing are part of the installation — not add-ons. Your windows and doors leave the site weather-tight and finished on both sides.
Licensed — Warren County, MO
Our Work
The Process
What's included in your window or door project with A&S?
Every window and door project with A&S Contracting Services includes a free on-site rough opening assessment, written material and labor quote, complete removal of old units, installation, exterior flashing, interior casing, and full cleanup. All pricing is confirmed before ordering begins.
1
Free On-Site Assessment
We measure rough opening dimensions, check for moisture and rot in existing frames, assess structural conditions, and confirm permit requirements before preparing your estimate.
2
Written Estimate & Product Selection
You receive a firm per-unit and total price. We discuss frame material (vinyl, fiberglass, wood-clad), glass packages (double/triple pane, Low-E coatings), and door options before anything is ordered.
3
Old Window/Door Removal
Existing units are carefully removed, rough openings are cleaned and inspected, any rotted framing is addressed, and openings are prepped for new product installation.
4
New Unit Installation & Flashing
New windows or doors are set, shimmed level and plumb, fastened to framing, and fully flashed on the exterior with moisture-barrier tape. Expansion foam seals the perimeter gap.
5
Finishing & Cleanup
Interior casing and trim are installed or matched to existing. All removed materials and packaging are hauled off-site. We test every window and door for operation before leaving.
Recent Work
What does completed window and door work look like near Warrenton?
Sample window and door projects completed by A&S Contracting Services in Warrenton, MO and surrounding Warren County communities.
Why A&S?
How does A&S compare to other window contractors in Warren County?
We assess rough openings, include interior finishing, and provide written estimates on every window and door project in Warrenton, MO.
What we offer
A&S Contracting
Other Contractors
Rough opening inspection included
✓ Every project
Often skipped
Interior trim & casing finished
✓ Included
Often extra
Old units hauled off-site
✓ Standard
Sometimes left behind
Written estimate before ordering
✓ Always
Often verbal only
Free on-site assessment
✓ No charge
Some charge fees
Common Questions
What do Warrenton homeowners ask about windows & doors?
The most common questions from Warren County homeowners before scheduling a free window or door estimate.
A&S Contracting Services installs replacement windows and new-construction windows across all major frame materials — vinyl, fiberglass, and wood-clad. For doors, we install entry doors, patio doors (sliding and French), storm doors, and interior passage doors. We work with whatever product the homeowner has selected or help with product sourcing if needed.
Window replacement in the Warrenton area typically ranges from $350 to $900 per window including labor, depending on window size, glass package, frame material, and installation complexity. Full-home replacements (10–20 windows) often qualify for per-unit pricing. Door installation ranges from $600 to $2,500 depending on door type and frame conditions. A&S provides free on-site written estimates with no obligation.
If you see condensation forming between the panes of a double or triple-pane window, the seal has failed and the insulating gas has escaped — resealing is not possible. That unit requires replacement. If condensation forms on the interior glass surface during cold weather without any between-pane fogging, the issue is interior humidity, not a failed window. We assess both during the free estimate.
Yes — particularly for homes in Warrenton that still have single-pane or early double-pane windows. ENERGY STAR-certified replacement windows reduce heat transfer significantly across Missouri's hot summers and cold winters. Homes with original windows from the 1980s or earlier typically see the largest gains. We can discuss U-factor and SHGC ratings for your specific situation at the free estimate.
A single window replacement typically takes 1–3 hours per window. A full-home replacement of 10–15 windows is usually a 1–2 day project. Entry door installation typically takes 4–6 hours. Patio door installation — especially if the rough opening requires modification — may take 6–8 hours. We confirm all timelines in the written estimate before scheduling.
Permit requirements vary by project type in Missouri. Most like-for-like window replacements (same rough opening, no structural change) do not require a permit in Warren County. Structural changes to rough opening size — such as enlarging a window opening or adding a new door — typically require a permit and inspection. We identify permit requirements during the estimate and handle the application when required.
Free estimate — no pressure
Ready to replace windows or doors in Warrenton?
Free on-site estimates for window and door installation in Warrenton, MO and Warren County. Written quotes, licensed crew, and same-week appointments often available.
Also Available
Other services you may need from A&S Contracting
Exterior Work
Complete exterior construction and renovation services including siding, roofing, and landscaping integration.
- Complete exterior renovation
- Siding, fascia & trim coordination
- Warrenton & Warren County licensed
Full Scale Interior Work
Comprehensive interior renovation and construction services including drywall, flooring, painting, and custom finishes.
- Complete interior renovations
- Drywall, flooring & custom finishes
- Single-crew project management