O'Fallon's Highest-Rated Vinyl Siding Pros, by Google
6 vinyl siding installers earned a spot on this O'Fallon page by Google rating, not by a state file this site doesn't have enough of yet. Wind risk reads Relatively Moderate and hail risk reads Relatively High for the county around O'Fallon, exactly the two stresses a panel's ASTM rating is supposed to answer.
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34° / 79°Fnormal January and July mean temperatures
What O'Fallon's climate asks of a vinyl panel
O'Fallon sees a normal January mean of 34°F against a July mean of 79°F, a wide enough spread that vinyl panels visibly expand and contract across the year.
That O'Fallon swing is exactly why installers leave slack at every opening rather than fastening panels tight.
4A is the IECC climate zone for the surrounding county.
Data: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020 (annual/seasonal and monthly, by station) (1991-2020), from the nearest NOAA station 6.7 mi away.
Wind and hail risk near O'Fallon
St. Clair County carries a Relatively High hail rating and a Relatively Moderate wind rating on FEMA's National Risk Index.
Around O'Fallon, hail typically dents vinyl before it cracks it; wind tests the fastening pattern and the panel's locking design more than the raw material.
- Strong wind
- Relatively Moderate
- Hail
- Relatively High
- Hurricane
- Very Low
- Wildfire
- Very Low
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
6 top-rated vinyl siding installers in and near O'Fallon
A single five-star review counts for less here than a few hundred reviews averaging 4.8, since the order below blends the star count with how many people left one. Nothing about that order checks a license, so ask to see one yourself before you sign.
Accredited Roofing
Siding contractor
- Google rating
- Reviews
- 470
- Area
- Fairview Heights 62208
Brandon J Roofing
Siding contractor
- Google rating
- Reviews
- 162
- Area
- O'Fallon 62269
Matterhorn Exteriors
Siding contractor
- Google rating
- Reviews
- 39
- Area
- O'Fallon 62269
The Roofing Guys
Siding contractor
- Google rating
- Reviews
- 64
- Area
- O'Fallon 62269
Allen Roofing & Siding
Siding contractor
- Google rating
- Reviews
- 63
- Area
- Caseyville 62232
1st Source Contractors
Siding contractor
- Google rating
- Reviews
- 23
- Area
- O'Fallon 62269
Before you sign, ask about the panel itself
- What thickness, in mils, is this panel, and does it carry an independent ASTM D3679 certification listing?
- Is this standard vinyl or insulated vinyl, and if insulated, what R-value is certified under ASTM D7793?
- What wind-load rating is the product certified for, in miles per hour, and how does that compare to {county}'s wind risk?
- Will the installer leave the manufacturer's specified expansion gap at trim, corners and openings, or nail tight?
- If the color is a dark shade, is it separately certified for color retention?
- Does any wall face reflected sunlight from a neighboring low-E window, and has that been accounted for in the material choice?