Bulldog Roofing
“I emailed her at 7:15 am to tell her what was happening and by 7:30 am there was a worker on my roof securing it… she really knows how to get things done!!!”
Best Insulation Contractors in Longmont, CO
24 contractors listed · 12 in Longmont · 1 open 24/7 · 13 open weekends · 22 rated 4.5+
Data verified October 27, 2026
Colorado Roof Toppers
“His estimate was very competitive with the others I had received; but with Scott I sensed integrity, and that he would be more dedicated to detail than the other contractors”
Westpro
“When the weather permitted, they performed a water pressure test and found that 1 nail (our of 1,000's on our roof) had popped up and was cause of the leak.”
Greenpoint Roofing
“From beginning to end, I was kept informed of every step and you actually have a person to call if you have questions and they get back to you immediately.”
Roof Check Inc
“We just had our roof replaced by Roof Check because of hail damage and I cannot express enough the gratitude that my husband and I have for this company.”
Francia's Painting LLC
“Not only did Sergio have the fastest and most responsive time compared to other companies contacted - he was great about communication and reasonable with pricing.”
The 24 contractors listed for Longmont, CO insulate attics, walls, crawl spaces and rim joists. Details under each one about materials, hours and the services advertised are copied from the company's own site; star ratings and comments come from public reviews.
Area overview: Longmont, CO
12 of the 24 contractors we list are based in Longmont; the other 12 serve Longmont from towns including Boulder (13 mi), Erie (9 mi) and Broomfield (15 mi). The contractors on this page are rated from 4.2 to 5.0 across 3,126 reviews; 14 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (88%), quality (88%) and responsiveness (83%). The topics that come up most in reviews of the contractors on this page are "price", "communication" and "estimates". 1 is open around the clock; 13 are open on Saturdays and 5 on Sundays. The services the contractors on this page list most often on their websites are residential roofing (5), commercial roofing (4), roof repair (3), spray foam insulation (3) and attic insulation (2). 4 show a license on their websites and 5 have a BBB rating of A or A+. 15 have ten or more years of experience, the longest 46 years. 1 offers emergency call-outs; 7 offer financing or payment plans; 13 give free estimates and 10 are family- or locally-owned. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
How many listings here have a website?
A website is on file for all 24 contractors here. Use it to see which materials they actually install, since a firm that only sprays foam will recommend foam. A contractor with no site is not automatically worse, but you will have to ask on the phone what the site would have told you.
Josh Brooks Construction and Renovation
“Fixed a really difficult to find leak from the balcony down, repaired the ceiling, insulated all around the sliding door, painted, and resurfaced the flat roof.”
Columbine Roofing & Solar
“They communicated with us every step of the way and were flexible with scheduling to accommodate me needing to get my young kids out of the house on install day.”
Red Canyon Roofing
“Three people came out to inspect everything and after some minimally invasive checking and based on the age of the house, they explained what was most likely occurring, how current code would fix it, and the different degree of repair depending on if...”
Unlimited Insulation Solutions Longmont
“Great interpersonal and communication skills!”
Apex Insulation Group Longmont
“Super chill and easy going!”
Ameritech Windows
“He was excellent at explaining to us the differences between the various brands and types of windows, and truly educated us throughout the entire time.”
Boulder Roofing
“Ryan came out and took a good look and it turned out he spotted something that needed attention--but was honest about the rest of it and didn't over prescribe work.”
Rosner Roofing
“They made sure everything was done to our satisfaction, did an awesome job pointing out supplemental items that were not noted on the original claim by my insurance.”
Black Roofing & Waterproofing
“It's amazing the range of work Black Roofing does from the many iconic roofs at CU and in Denver, to the simple shingle roof on our one-story building in Erie.”
Eco Handyman
“Nate is an excellent communicator, Tyler and Ryan did a stellar job, working in a very tight area of our utility room, and a complicated route for the fan and piping outside.”
Red Rock Roofing
“Everything from the roof inspection, working with the insurance adjuster all of mine, and my wife's questions, Care during installation day and cleanup.”
Rise Construction
“When it comes to delivering excellent service; from the initial conversation to the end of the project, Rise Construction is the best company without a doubt.”
Roof Masters
“Dylan and Jennifer of Roof Masters responded immediately to our call back with additional work and pictures around more of the skylight, at no additional charge.”
Blue Frog Roofing Limited
“From helping us understand city codes, home owners insurance, attending the City Of Loveland inspection of our moms roof, and choosing the right shingles.”
Colorado Weather Coatings
“They use Everest products, with a focus on the prep work: cleaning the old surface, tightening or replacing the old hardware, priming, sealing seams and hardware, and then doing a double topcoat.”
Handyman
“He helped my husband and I remodel a bathroom, framing and dry walking in a new closet, and adding a custom two person shower with inlet shelves and a bench.”
AMC Roofing Inc.
“He fixed tile damage on my roof and was very honest with his assessment.”
Colorado Insulation & Whole House Fans
“We were going to just install ceiling fans but that turned out to be a lot more expensive than we imagined (over $2,500 for 4 fans and electrician fees), plus the ceiling in 2 of the rooms were a little uncomfortably low for ceiling fans).”
Why these companies made our list
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