4.5 
130 *The Angi rating for Insulation Service companies in Sunnyvale, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Insulation Service needs.
*The HomeAdvisor rating for Insulation Service companies in Sunnyvale, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Insulation Service needs.
Last update on May 29, 2026
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 1988
Free estimates
Warranties offered
"The guy checked my house, told us our insulation is good enough and we don't really need to do anything. Thanks for the honesty. I will definitely recommend this guy to my friends."
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 1988
Free estimates
Warranties offered
"Had a great experience hiring Bay Valley Insulation. The quote arrived very efficiently and was the price I was looking for. The crew of Tony and Henry arrived inside the scheduled window and work was completed in a timely manner that day. The job looked great in the blown attic and final clean-up was great. Thank you."
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 2017
Free estimates
Offers commercial services
"They did a terrific job insulating our new home in Oakland. Great value and professional."
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 2013
Free estimates
Warranties offered
"They fit into my Roofing schedule perfectly as I had my roof off and needed some insulation at a certain time."
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 2003
Free estimates
Emergency services offered
"I was happy with the job that was done. It provides insulation plus a vapor barrier. He put in a radiant barrier. It looks almost like tinfoil. They crawled around under the house installing it. It insulates better then conventional insulation. My house is warmer when it is cool and cooler when warm."
+9
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"Getting my attic cleanup and insulation installed was expertly done by Attic Pros. Couldn't be happier with the result. They are definitely pros!"
+3895
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 2008
Free estimates
Warranties offered
"The crew arrived on time and installed plastic on the floor and walls for protection. They did a good job removing the old insulation and installing new insulation. The crew did a great job cleaning up. Nice professional job."
+26
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 2017
Free estimates
Emergency services offered
"Attic Professionals was awesome to work with and highly recommend their business for anyone looking for attic work. We hired his business to replace the insulation in our attic after I took care of a rat issue. We needed all the insulation and droppings removed, cleanse, and replace. Attic Professional crew were diligent with making sure the interior of our home was protected covering the walls and floors to remove the old insulation and did a great job installing the new insulation. Thank you for great service!!!!!!!!"
+103
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 1975
Free estimates
Warranties offered
"Project was to install side wall insulation for a 60 yr old apartment."
+22
Serving Sunnyvale, CA and surrounding areas
Approved
In business since 1999
Free estimates
Warranties offered
"Attic Elite is BY FAR the most professional insulation contractor. When you are looking at a major purchase (over 10k) it's good to know the contractor isn't "flying by the seat of their pants", especially when asbestos is involved."
+77
From average costs to expert advice, get all the answers you need to get your job done.
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