Top-Rated Vinyl Siding Installers in Thornton, CO
9 vinyl siding installers earned a spot on this Thornton page by Google rating, not by a state file this site doesn't have enough of yet. Wind risk reads Relatively High and hail risk reads Very High for the county around Thornton, exactly the two stresses a panel's ASTM rating is supposed to answer.
Google Maps ratings checked · How we rank
34° / 75°Fnormal January and July mean temperatures
Temperature swings in Thornton
Thornton sees a normal January mean of 34°F against a July mean of 75°F, a wide enough spread that vinyl panels visibly expand and contract across the year.
That Thornton swing is exactly why installers leave slack at every opening rather than fastening panels tight.
5B 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 4.1 mi away.
Storm ratings on file for Adams County
Wind risk in Adams County rates Relatively High and hail rates Very High, per FEMA's county-level data.
Neither rating changes what's inside a box of siding sold in Thornton, but both are good reason to ask for a panel's actual wind-load certification rather than trusting the sample board alone.
- Strong wind
- Relatively High
- Hail
- Very High
- Wildfire
- Relatively Low
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Vinyl siding installers near Thornton, by Google rating
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.
Roof Worx
Siding contractor
- Google rating
- Reviews
- 407
- Area
- Thornton 80241
Elite Exteriors of Denver LLC
Siding contractor
- Google rating
- Reviews
- 51
- Area
- Thornton 80233
Arrow Roofing & Exteriors
Siding contractor
- Google rating
- Reviews
- 44
- Area
- Thornton 80241
KELLY CONSTRUCTION
Siding contractor
- Google rating
- Reviews
- 57
- Area
- Thornton 80241
Ultimate Exteriors of Colorado
Siding contractor
- Google rating
- Reviews
- 26
- Area
- Thornton 80229
Affordable Professional Siding LLC
Siding contractor
- Google rating
- Reviews
- 13
- Area
- Northglenn 80233
Carlson Siding & Construction
Siding contractor
- Google rating
- Reviews
- 30
- Area
- Thornton 80602
Cardinal Exterior
Siding contractor
- Google rating
- Reviews
- 41
- Area
- Thornton 80241
Sheppard's Total Exteriors
Siding contractor
- Google rating
- Reviews
- 53
- Area
- Thornton 80233
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?