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Giovanni's Handyman Services
“I feel he's honest, has fair prices and I can trust him.”
Best Insulation Contractors near Diamond Bar, CA
1 of these contractors is based in Diamond Bar; the others serve Diamond Bar from towns including Anaheim (11 mi), Upland (12 mi) and Brea (6 mi).
5 open 24/7 · 15 open weekends · 19 rated 4.5+ · 12 show a license
Data verified October 15, 2026
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Roof Pro
- Rain
- Cleaning
- Estimate
“Jhonny geared up, climbed up looked at my concern and pointed out a cpke other spots, he also explained that they were actually quick and simple repairs and walked me thru them in great detail and I was with his help able to repair them easily.”
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Competition Roofing
- Clean
- Estimate
- Job
“A few wanted to do a tear down and put a new roof that took me to another question of what kind of material to use plus the cost of a new roof wasn't within my budget at the time.”
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Guardian Roofs
- Tiles
- Work
- Estimator
“So, for the SAME price that others were quoting to pull off the whole roof, repair a small section with new tiles and then re-use our old ( defective and crumbling) tiles to put back down, Guardian gave us a whole NEW tile roof as well as repairing s...”
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Eco Air Solutions- Heating/Air/Quietcool-That Fan Guy
- Job
- Hvac
- Summer
“From start to finish, this project/installation was a breeze, thanks to the Don and his incredible team of two professionals who worked on the whole house fan install.”
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So Cal Remodeling
- House
- Wall
- Insulation
“I've known Darren and this company for more than 10 years but I just had So Cal Remodel help me to install and heat pump on my new ADU and to help with a garage conversion.”
The 24 contractors listed for Diamond Bar, CA 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: Diamond Bar, CA
The 24 contractors on this page are rated from 4.2 to 5.0 across 1,250 reviews; 4 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (90%), quality (80%) and responsiveness (77%). The topics that come up most in reviews of the contractors on this page are "price", "cleanliness" and "estimates". 5 are open around the clock; 15 are open on Saturdays and 11 on Sundays. The services the contractors on this page list most often on their websites are crawl space insulation (2), new roof (2) and roof repairs (2). 12 show a license on their websites; 2 list staff certifications (GAF and LEED) and 4 have a BBB rating of A or A+. Domain records put 18 websites of the contractors on this page at ten or more years old; the oldest dates from 2000. 5 offer emergency call-outs; 5 offer financing or payment plans; 15 give free estimates; 9 are family- or locally-owned and 5 list coupons or special offers. 1 has Spanish-speaking staff. 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 23 of the 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.
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T & G Roofing and Solar Company Inc.
- Tile
- Work
- Project
“Mike the owner went out of his way to find roof tile that matched the associations requirements and got a deal on a discontinued color then pasted the saving on to us, that was unexpected.”
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Greencat
- Efficient
- Questions
- Informative
“Greencat inc did an amazing job from start to finish with mayela setting up the appointment and Cody and jay did a wonderful job start to finish thank you”
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The Attic Doctors
- Team
- Job
- Efficiency
“My attic is large with a shallow roof line making it very difficult to move inside with all the roof brazing, cabling and HVAC ducting throughout, some with asbestos.”
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YS Attic Insulation
- Dryer
- Photos
- Estimate
“YS Attic Insulation offers excellent attic cleaning and sanitation services.”
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Skycraft Roofing
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Custom Roof Company
- Stars
- Crew
“Absolutely great experience with this team on a roof rehabilitation for our office building.”
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Brea Roofing
- Price
- Job
“After numerous other companies which would either no show or makes us sell our souls in order to complete the repairs I was put in touch with brea roofing through our RE agent.”
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All In One Roofing and Solar
- Happy
- Communication
- Team
“Once he assessed it he told me that they don't even make this particular tile that we had on our roof anymore, but he assured that he could get the tiles through his sources!”
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Highland Commercial Roofing
“Senior Project Manager Dan Nahirny came out and provided a thorough inspection, and wrote a detailed quote to do the work with several different warranty and price options.”
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Coast Electric Company
- Fair
- Electrical
- House
“They are taking care of everything for my electric panel replacement, from permit to stucco repair (most of other electric companies won't do stucco repair).”
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Western Roofing Systems
“Bob was also very helpful throughout the entire process and was always available for my questions or concerns from the beginning to the end of the installation.”
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MCB Installations Inc
- Door
“The company clearly employs people that are not only efficient, know their business and enjoy it, but are knowledgeable, friendly, organized, informative, and easy to work with.”
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Micasa Pro Roofers
- Estimate
- Price
- Properties
“John and the crew know what they're doing, and were in and out without all the chaos I normally associate with major home repairs.”
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SDI Insulation
“Thanks, you always treated me kindly.”
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Anaheim Roofing
“Having someone take the time to break it down with me was the reason I chose to go with these guys and Im so happy I did.”
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Honeycutt Tear-Off
“I have been using Honeycutt for years and they always perform .”
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Rodgers Roofing
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Tiger Foam
- Team
- Skills
- Technicians
“Thank you so much for following all my instructions and working patiently for me Nathan”
Insulation Services in Diamond Bar, CA Cost Estimates
Minimum cost
$503
Maximum cost
$3683
National Average
$1726
Avg Per Hour Rates
$69
$1083
$2492
Typical price range is based on 377 cost profiles
Why these companies made our list
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