Windows Cost in O Fallon, MO in 2026
Most Windows projects in O Fallon, MO cost between $4,500 and $18,000. The typical price is $8,500.
O Fallon prices track the national average closely. Costs here are close enough to the national picture that the adjustment barely moves the number.
What drives the price
- Vinyl, fibreglass or wood-clad frames
- Double versus triple glazing and low-E coatings
- Full-frame replacement versus insert into the existing frame
- Custom sizes, bays, bows and arched tops
Usually included
- Windows, frames and hardware
- Removal and disposal of the old units
- Installation, insulation and interior trim
- Exterior caulking and capping
Usually extra
- Rotten sill or framing repair found on removal
- Interior painting
- Permits where required
Unit prices in O Fallon, MO
| Quality tier | Cost each |
|---|---|
| Budget | $450 |
| Mid-range | $850 |
| High-end | $1,800 |
Window replacement companies in O Fallon, MO
Businesses listed on Google near O Fallon, MO. We are not affiliated with them and do not vet them — always confirm licensing and insurance before hiring.
Window Depot USA of St. Louis (XteriorPRO)
5.0(251 reviews)
5988 Mid Rivers Mall Dr #238, St Peters, MO 63304
Windows Doors & More LLC
5.0(190 reviews)
3481 New Town Blvd, St Charles, MO 63301
The Glass Guru
4.9(207 reviews)
2182 E Pitman Ave, Wentzville, MO 63385
STL Windows and Doors
4.9(198 reviews)
4200 Shoreline Dr, Earth City, MO 63045
Floyd Glass & Window
4.6(219 reviews)
30 Triad South Dr, St Peters, MO 63304
Spectrum Glass & Tinting
4.6(170 reviews)
955 W Terra Ln, O'Fallon, MO 63366