Rapid Radon Relief
“Rapid Radon Relief's certified professionals, like Tyler, will thoroughly test your Denver property and develop a customized mitigation plan to quickly and effectively reduce radon to EPA-approved standards.”
Best General Contractors in Thornton, CO
24 companies listed · 7 in Thornton · 2 open 24/7 · 13 open weekends · 22 rated 4.5+
Data verified October 28, 2026
Carlson Siding & Construction
“At the end of the day tools were picked up and all materials and products put away prior to leaving, the outside parameter of the house was left clean during and after installation.”
Colorado Demolition & Deconstruction
“This included removing kitchen, 3 bathrooms, carpet, all baseboards, interior doors and taking down a wall to open up the floor plan.”
Lucas Remodeling
“Igor worked hard to keep us on budget even though we uncovered some unknown issues from the previous/existing construction which created additional work and repair.”
A & E Concrete Design Llc
“We were able to get an estimate within a few days of initial contact and job was completed within a week!”
Fourth Generation Contracting
“We worked with Gary and Fourth Generation Contracting on a Marshall Fire rebuild and they're a great company to work with!”
Listed for homeowners in and around Thornton, CO, these 24 companies take on multi-trade work, from a single addition to a whole-floor renovation. What each one says about licensing, hours and the work it takes on comes from its own website; ratings and quotes come from public reviews.
Area overview: Thornton, CO
Of the 24 companies we list here, 7 are in Thornton itself and 17 come from towns including Arvada (6, 13 mi), Denver (4, 11 mi) and Lakewood (3, 18 mi). The companies on this page are rated from 4.3 to 5.0 across 2,310 reviews; 14 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (90%) and responsiveness (84%). 2 are open around the clock; 13 are open on Saturdays and 4 on Sundays. The services the companies on this page list most often on their websites are additions (2), basement remodeling (2), bathroom remodeling (2), general contracting (2) and home remodeling (2). 6 show a license on their websites and 6 have a BBB rating of A or A+. Domain records put 15 websites of the companies on this page at ten or more years old; the oldest dates from 1999. 2 offer emergency call-outs; 1 offers remote or virtual consultations; 4 offer financing or payment plans; 11 give free estimates; 4 are family- or locally-owned and 3 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Why do some of these firms sit outside Thornton?
Only 7 of the 24 companies here are based in Thornton. The rest come from other towns within 20 mi. Crews travel to the work, so the office address matters less than whether they will send the same people every morning and what travel time does to the price.
Amazing Basement Creations
“As with all major projects there will be bumps in the process, Amazing Basement Creations handled and addressed those issues in a professional and courteous manner to the satisfaction of both my wife and I (the client) and Zack (Amazing Basement) the...”
Eagle Remodeling Corp
“Very Professional the Owner a great very kind woman, came over to explain what was going to be done.”
Decktec Outdoor Designs
“Highly quality craftsmanship and more, timely, all services and aspects were professional and top notch, will utilize them for any other home addition moving forward and repairs as needed.”
Aloha State Builders
“I've recommended Ed to many good friends in Denver, CO and they have all been very pleased with his completion of details and how clean the site looks daily after constructing in their home.”
Factor Design Build
“From the design team, to the construction, and project management team, they spent all the time necessary to go through every detail so by the time our project began, we knew everyone was on the same page, and knew exactly what the design was; right ...”
Home Choice Renovation Llc
“Would highly recommend, they were very friendly and went over so many options with my parents who are definitely a little frustrating and difficult to work with 😂 so patient and creative.”
K&H Home Solutions
“No hassle sales process (a big plus compared to other vendors), great price for a great window (we sought estimates from 5 vendors), install team was amazing and the windows look great!”
Endurance Roofing & Contracting LLC
“With having a level built in a home theatre, electrical work for some light installation, a built-in bench adjusted, and changing out some bathroom shower plumbing, I got to see them work on multiple things, and they excelled with everything.”
Earth Saving Solutions Construction & Roofing
“Over the following year (supplies delay lead to much longer time course from initiation to completion), we remodeled two bathrooms (including master), replaced flooring in the second floor, painted various parts the house, and replace kitchen applian...”
The Basement Sanctuary
“Recently we've had realtors and property managers come in to assess our house since we are moving, and all have commented that our basement was done exceptionally well and that it is definitely a value add.”
Jax Home Construction
“We've used Ali with Jax Home Construction three times here in Denver and each time he has been extremely professional, done a fantastic job, and gone out of his way to do the job RIGHT.”
Colorado Home Services
“Carl and Isaiah arrived on time, discussed with us the best location for the air intake, were interactive as the job progressed, and afterwards cleaned up and restored everything to pre-installation conditions.”
Faros Construction Services
“Completely unsure how to proceed with this project, we turned to Faros Construction who not only removed the failing retaining wall, fence, and cement pad but rebuilt all three as they should have been constructed in the first place.”
Urban Exteriors
“Urban Exteriors is a family owned business with personal services; they handled a huge account after a hailstorm in 2017; they are efficient with excellent crews and quality work with quality products.”
A2Z Builders
“We did a Full kitchen remodel with new pantry, new kitchen cabinetry, new quartz countertops with a waterfall on the island, we refineshed the floor and done paint all around the house Due to Rons knowledge and experience , he was able to help make t...”
Sheffield Homes Finished Basements & More
“I have built and sold three rehab businesses in my years of professional life and am building a fourth business along side my daughter and son-in-law, for us, everything is about customer service, excellence, and unmatched quality.”
Radon Safety LLC
“Both installers that worked on this job showed up within the estimated time window, called ahead to let me know a more specific time they would show up, and they worked in a quick yet detail oriented way.”
Lucero Fence Company
“I watched most of the installation and was particularly impressed that the installation was quick and efficient but I never got the impression that the workers were trying to rush the job.”
Why these companies made our list
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