I had a ProVia entry door installed and everything went great from start to finish, from consulting with Ryan on options, to delivery and install (quality of work was excellent). And price was super reasonable. If they can get the product you want, do not go with the big companies. Window and Siding Source is who you want.
St. Louis, MO & Surrounding Areas
Window Replacement
Energy-efficient ProVia windows installed by experienced St. Louis contractors. No pressure. No waiting. We quote on the spot.
Signs It's Time
Does Your Home Need New Windows?
Your home won't always tell you directly when it's time to replace your windows — but it will show you signs. Here are the key indicators:
- High energy bills that keep creeping up
- Outside noise is clearly audible through closed windows
- Windows won't shut or latch properly
- Windows are difficult or impossible to open
- Damaged, warped, cracked, or broken frames
- Condensation or frost forming on the interior glass
- Visible drafts or temperature differences near windows
- Renovating or upgrading an older home
Benefits
Why Replace Your Windows?
- Dramatically increased curb appeal and home value
- Lower energy bills — improved insulation year-round
- Reduced outdoor noise for a quieter home
- Enhanced security — most new windows tested for forced entry
- Low maintenance requirements
- Consistent interior temperatures in every season
If you feel your home may be in need of replacement windows, we would be happy to help. Give us a call today at 636-224-2444.
Our Process
How It Works
1
Free In-Home Estimate
We come to your home, measure every opening, and explain your options in plain English — no vague ballpark quotes, no high-pressure sales tactics. We quote on the spot.
2
Product Selection
Choose your window style, glass package (double or triple pane, low-E coating, argon gas fill), and frame finish. We walk you through every option so you buy exactly what you need.
3
Professional Installation
Our crew protects your floors and furnishings, removes the old windows carefully, and installs your new ProVia windows — typically completing a full home in 1–2 days.
4
Final Walkthrough
We test every window for smooth operation and a tight seal, clean up the job site completely, and walk you through everything before we leave.
Answers
Frequently Asked Questions
How long does window replacement take?
A single window installation typically takes 2–4 hours. A full home with 10–15 windows can usually be completed in 1–2 days. Our crews work efficiently to minimize disruption — most homeowners tell us the job goes faster than they expected.
How much does window replacement cost in St. Louis?
Window replacement in the St. Louis area typically ranges from $400 to $1,200 per window installed, depending on size, style (single-hung, casement, bay/bow), glass package, and frame material. We offer 5-year interest-free financing with no money down, so you can get the windows your home needs without a large upfront payment.
What window brands do you install?
We specialize in ProVia windows, widely considered among the best in the industry for energy efficiency, durability, and craftsmanship. ProVia windows are made in the USA and come with a transferable lifetime warranty on frames, glass seal, and hardware.
Do new windows really lower energy bills in St. Louis?
Yes — and the St. Louis climate makes it especially relevant. Summers regularly top 90°F and winters frequently drop below 20°F. Single-pane windows lose up to 30 times more heat than an insulated wall. Upgrading to double-pane or triple-pane windows with low-E glass can reduce heating and cooling costs by 15–25% annually — a meaningful savings on a typical St. Louis utility bill.
Do I need a permit for window replacement in St. Louis County?
In most cases, a like-for-like window replacement — same size, same opening — does not require a building permit in St. Louis County or St. Charles County. If you're enlarging the opening or altering structural framing, a permit may be required. We'll advise you during your free estimate if a permit applies to your project.
What's the difference between single-pane, double-pane, and triple-pane windows?
Single-pane windows have one layer of glass and very little insulating value — common in homes built before the 1970s. Double-pane windows have two glass layers with a sealed argon gas space in between, dramatically improving insulation and noise reduction. Triple-pane windows add a third glass layer for maximum energy efficiency and soundproofing, ideal for rooms facing busy streets or severe weather.
What warranty comes with ProVia windows?
ProVia offers a limited lifetime warranty covering the frame, glass seal, hardware, and screens. The warranty is transferable to the next homeowner — a genuine selling point if you plan to sell your home down the road.
Can you replace windows in winter?
Yes. We install windows year-round in St. Louis. Cold-weather installs are done efficiently to minimize heat loss during the process. Winter can actually be an ideal time to schedule — we typically have more availability and can often get you on the calendar faster than during peak spring and summer months.
Customer Reviews
St. Louis homeowners,
in their own words.
5.0
These guys installed new, energy efficient windows on my home this Spring. I couldn't be happier!! Had a small issue with one of the windows that left them and myself puzzled, but in no time they ordered a new sash from the manufacturer and fixed the issue. I am so pleased and will recommend these guys to everyone! Ryan, thanks for your patience with me too! LOVE my new windows!
Ryan and his team did outstanding work. Highly recommend The Window and Siding Source for any home exterior project.
St. Louis, MO & Surrounding Areas
Get a Free Window Estimate
We quote on the spot — no waiting, no pressure. Call or request online.
5-year, interest-free financing — No money down. No pre-payment penalties.