Window Installation Service

Door & Window Repair Service in O'Fallon, MO

Name: Keller Window & Door LLC
Address: O'Fallon, MO, US
Telephone: (314) 399-2001
Price range: $$$
Rating: 5.0

5 specialized services available

Windows and doors that stick, leak, or won't close properly need attention. We repair broken hardware, fix seals, adjust frames, and restore smooth operation. Most repairs are straightforward and done in one visit. We work throughout the St. Louis area including O'Fallon, Chesterfield, St. Peters, Wentzville, Wildwood, Ellisville, Creve Coeur, St. Charles, Ladue, Oakville, University City, Ballwin, Town and Country, and Maryland Heights.

Call (314) 399-2001

Window repair technician fixing a residential window

Door & Window Repair Service

Serving O'Fallon, MO and the Florida Panhandle

Since 2015 Years Local

Free Estimates

5-Year Warranty

Services

Door & Window Repair Service Services in O'Fallon, MO

A repaired double-hung window on the exterior of an O'Fallon, Missouri home, showing a clear, fog-free pane and a properly seated frame. A technician from Keller Window & Door LLC checks the sash hardware and weatherstripping on the finished repair.

Window Repair

Keller Window & Door LLC provides professional window repair for O'Fallon homeowners dealing with broken glass, failed seals, and hardware issues.

Restored glass seals stop moisture and fogging between panes
Repaired weatherstripping reduces drafts and lowers heating and cooling costs
Fixed locks and hardware improve home security without a full window replacement

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A repaired exterior entry door on an O'Fallon residential home, showing a flush-closing door with new weatherstripping along the frame. Close-up view of the door threshold and sealed gap at the base after a professional door repair service.

Door Repair

Keller Window & Door LLC provides door repair services for O'Fallon homeowners dealing with sticking, drafting, or damaged doors.

Sealing gaps and replacing worn weatherstripping reduces outside air infiltration and lowers energy bills
Correcting frame and hinge alignment stops doors from sticking or dragging through O'Fallon's humid summers
Repairing latch and lock hardware restores proper security at every entry point

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A close-up of a repaired casement window crank operator and latch on a residential window in O'Fallon, Missouri, with the sash fully closed and locked. The hardware is clean and properly aligned against a painted wood frame.

Window Hardware Repair

Keller Window & Door LLC repairs window hardware for O'Fallon homeowners who need locks, balances, cranks, and sash components fixed.

Locks and latches that close flush keep your home more secure
Repaired sash balances hold windows open without a prop
Fixed crank operators restore smooth, one-hand operation on casement windows

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A technician adjusting a door hinge and strike plate on a residential entry door in O'Fallon. Close-up view shows hardware components being aligned during a door hardware repair service call.

Door Hardware Repair

Keller Window & Door LLC provides door hardware repair for homes and businesses in O'Fallon.

Doors latch and lock correctly, closing security gaps at entry points
Properly aligned hardware reduces hinge wear and prevents door frame damage
Tightened and replaced components stop rattling and dragging on every use

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A double-pane window on an O'Fallon home showing foggy, moisture-clouded glass between the panes before seal repair. A technician from Keller Window & Door LLC inspects the window frame and glass unit from inside the home.

Window Seal Repair

Keller Window & Door LLC repairs failed window seals for O'Fallon homeowners dealing with foggy glass and drafts.

Clears foggy, hazy glass so you can see out of your windows again
Stops outside air from leaking in around failed seals, reducing drafts near windows
Helps your heating and cooling system work less by restoring the window's insulating performance

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We Serve

Why Choose Us

What sets us apart for Door & Window Repair Service

Andersen Certified Contractor and Elite Certified distinction

Former Andersen employee owner with 30 years field experience

Factory-level installation precision and quality standards

Transparent pricing and clean workmanship

Appointment-only service for focused attention

Ready to get started?

Seen the work. Ready to talk about your project?

Call (314) 399-2001

FAQ

Common Questions About Door & Window Repair Service in O'Fallon, MO

Straight answers to the questions homeowners ask before hiring a local contractor.

Do you repair windows and doors in Wentzville?

Yes, we repair windows and doors throughout the St. Louis area including Wentzville. Call 314-399-2001 to schedule.

What kind of window and door problems do you fix?

We fix stuck windows, broken seals, damaged hardware, misaligned frames, and doors that won't close properly.

Is it cheaper to repair or replace a window?

We'll tell you during the appointment. Some repairs cost far less than replacement and work great. Others make replacement the better choice.

How quickly can you repair a window or door?

Call 314-399-2001 to schedule an appointment. We work by appointment Monday through Friday, 8:30 a.m. to 4:30 p.m.

Still have questions?

Call us directly. Real answers, no scripts.

Call (314) 399-2001

Client Reviews

What St. Charles County homeowners say.

5.0

11 Google reviews

Worked with us?

Leave a Review

I highly recommend Keller! The windows which I had replaced in my home are wonderful and I was very pleased with working with Keller. John Keller was very professional and honest in his recommendations for my windows as well as giving me a fair price for quality windows and workmanship. This is the only company to go with for window and door installation!

It was a pleasure working with John and his crew. They were helpful and did an excellent job with installation. I would use them again and recommend to anyone in need of a new patio door or other items they sell. Brenda Wilson

I love my new windows! What makes them even better is that the whole experience with Keller was very positive! I wish all contractors worked like John does. He was quick to reply for an estimate. His price was very fair. He came to install the windows when he said he would and he did what he said he would. (He actually did a little extra.😊)John and his crew were respectful, efficient, friendly. They protected my floors. They cleaned up after themselves. And they didn’t try to charge me extra for unforeseen issues. They wanted me to be happy and I AM. VERY. My new Andersen Windows are gorgeous and I would definitely recommend Keller Window and Door to my friends!!

John Keller and his team did an AMAZING job installing our new Anderson windows on our Sun porch! They were professional, friendly & courteous. John is extremely knowledgeable and knew exactly the right windows needed to match our historic neighborhood’s guidelines. John was wonderful to work with. I highly recommend Keller Window and Door!

John and his team were great from start to finish. He provided a no pressure sales quote and was responsive every time I reached out with questions. The installation process was quick, clean, and efficient. Great customer service from start to finish. Can recommend him enough.

Find Us

Proudly Based in O'Fallon, MO

Stop by, call, or book online — we're always nearby when you need us.

Phone

(314) 399-2001

Hours

Monday 8:30 AM - 4:30 PM
Tuesday 8:30 AM - 4:30 PM
Wednesday 8:30 AM - 4:30 PM
Thursday 8:30 AM - 4:30 PM
Friday 8:30 AM - 4:30 PM
Saturday Closed
Sunday Closed