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
Beautiful Windows.
Built to Last.
Transform your home's comfort, energy efficiency and curb appeal with expertly installed windows and siding.
- BBB A+ Accredited
- 24 Years in St. Louis
- James Hardie Elite
- No Subcontractors
BBB A+ Rated
Accredited Business
Super Service Award
Angi verified reviews
24+ Years Experience
Serving St. Louis since 2002
No Subcontractors
Our own crews, every job
Financing Available
5-year, interest-free financing
5.0 from 22 Google reviewsRead them
24+
Years in Business
A trusted name in St. Louis since 2002. Our track record speaks for itself.
A+
BBB Accredited
Verified integrity and top-rated customer service with the Better Business Bureau.
$0
No-Pressure Quotes
We quote on the spot, in your home. No obligation — you decide on your own timeline.
What We Do
Expert installation,
every single time.
Four core services, one crew. We never hand your home to a subcontractor.
Window Replacement
Energy-efficient ProVia windows built for St. Louis homes.
Learn More
Door Installation
ProVia entry, storm, patio, and glass doors — installed right.
Learn More
James Hardie Siding
Fiber-cement siding that lasts 50 years. Installed in St. Louis.
Learn More
Vinyl Siding
The most popular, affordable siding option. Done right.
Learn MoreThe Work
Windows, doors and siding
worth looking at.
Every product we install is chosen to hold up in St. Louis weather and look right on a St. Louis home — James Hardie fiber cement, Craneboard vinyl, and ProVia windows and doors.
Explore all services
Vinyl Siding
Lap siding with shake-accent gables
Entry Doors
Stained wood entry door with glass lite
Patio Doors
French patio doors with arched transom
Entry Doors
Craftsman door on a covered porch
Windows
Double-hung windows with colonial grilles
Windows
Floor-to-ceiling glass with transom lites
Product imagery shown for illustration. Read what our customers say about their own installations.
Who We Are
St. Louis' most trusted window & siding contractor.
The Window and Siding Source is locally owned and operated, serving the St. Louis Metro Area and St. Charles County since 2002. Our team knows what it takes to do the job right the first time — no subcontractors, no shortcuts.
We specialize in James Hardie Siding, Craneboard, and ProVia Windows & Doors — premium products backed by 5-year, interest-free financing. Every project is treated like it's our own home.
How It Works
Five steps. No surprises.
The same process on every job, whether it's one window or a whole exterior.
- 1
Free Consultation
Free Consultation
We come to your home, look at the actual conditions, and talk through options. No showroom trip, no pressure.
- 2
On-Site Measurements
On-Site Measurements
Every opening measured by the people who will install it — so nothing arrives the wrong size and nothing gets forced to fit.
- 3
Quote On The Spot
Quote On The Spot
A written quote before we leave, backed by 5-year, interest-free financing. You decide on your own timeline.
- 4
Professional Installation
Professional Installation
Our own crews — never subcontractors. The same team that measured your home is the team that installs it.
- 5
Final Walkthrough
Final Walkthrough
We walk the job with you, clean the site, and don't call it finished until you say it is.
Financing
Affordable monthly payments.
A new exterior shouldn't wait on a lump sum. We offer 5-year, interest-free financing so you can start the work now and spread the cost over five years.
No money down. No pre-payment penalties.Ask about your options during your free in-home estimate — we'll walk through what qualifies before you commit to anything.
Your Terms
5-year, interest-free financing
- Term length
- 5 years
- Interest
- 0% — interest free
- Money down
- None required
- Pre-payment penalty
- None
Financing is subject to approval. Exact terms are confirmed in writing during your free in-home estimate.
Customer Reviews
St. Louis homeowners,
in their own words.
5.0
ChesterfieldBallwinEllisvilleWildwoodManchesterKirkwoodWebster GrovesCrestwoodSunset HillsFentonCreve CoeurLadueClaytonDes PeresFlorissantArnoldSt. CharlesO'FallonWentzvilleLake Saint LouisSt. PetersDardenne PrairieChesterfieldBallwinEllisvilleWildwoodManchesterKirkwoodWebster GrovesCrestwoodSunset HillsFentonCreve CoeurLadueClaytonDes PeresFlorissantArnoldSt. CharlesO'FallonWentzvilleLake Saint LouisSt. PetersDardenne Prairie
Where We Work
Serving the St. Louis Metro Area
From historic Kirkwood to growing O'Fallon — we serve 22 cities across St. Louis County and St. Charles County.
ChesterfieldSt. LouisBallwinSt. LouisEllisvilleSt. LouisWildwoodSt. LouisManchesterSt. LouisKirkwoodSt. LouisWebster GrovesSt. LouisCrestwoodSt. LouisSunset HillsSt. LouisFentonSt. LouisCreve CoeurSt. LouisLadueSt. LouisClaytonSt. LouisDes PeresSt. LouisFlorissantSt. LouisArnoldSt. LouisSt. CharlesSt. CharlesO'FallonSt. CharlesWentzvilleSt. CharlesLake Saint LouisSt. CharlesSt. PetersSt. CharlesDardenne PrairieSt. Charles
St. Louis, MO & Surrounding Areas
Ready to transform your home?
Let's build something beautiful together. Free in-home estimate, quoted on the spot — no pressure, no obligation.
5-year, interest-free financing — No money down. No pre-payment penalties.