4.6 
30 *The Angi rating for Insulation Service companies in Hillsborough, 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 Hillsborough, 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 31, 2026
Serving Hillsborough, 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 Hillsborough, 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 Hillsborough, 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 Hillsborough, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2012
Free estimates
Small jobs welcome
"Melesio and his team did an excellent job removing old insulation/cleaning, rodent proofing/sealing, and installing new insulation all in one day."
+3137
Serving Hillsborough, CA and surrounding areas
Approved
In business since 2008
Free estimates
Warranties offered
"Attic is all clean and insulated now! The team was great!"
+26
Serving Hillsborough, CA and surrounding areas
Approved
In business since 2017
Free estimates
Emergency services offered
"Installed insulation and best barrier of aluminum. Prompt and thorough! with good communication"
+103
Serving Hillsborough, 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 Hillsborough, CA and surrounding areas
Approved
In business since 2023
Free estimates
Warranties offered
Rywen Insulation Inc is a licensed and family-owned company proudly serving the Bay Area. We specialize in high-quality insulation services, rodent proofing, and vapor barrier services that help protect your home or business from energy loss, moisture damage, and unwanted intrusions.\n\nWith a strong focus on long-term solutions, we’re committed to improving indoor comfort, enhancing air quality, and increasing energy efficiency. Our team delivers professional results with attention to detail and care on every project.\n\nContact us today to schedule a free estimate and experience reliable service you can count on.
+17
Serving Hillsborough, CA and surrounding areas
Approved
In business since 1999
Free estimates
Warranties offered
"I actually had both my attic and walls insulated. Great price, on-time, efficient, clean-up and communication. Unusual from most contractors today. I would highly recommend these guys. Milo was our contact."
+77
Serving Hillsborough, CA and surrounding areas
Approved
Free estimates
Emergency services offered
Warranties offered
"American Attic was everything they promised. Met with the owner , Sam, within a day to get a quote for removal of old insulation, rodent control and install of new insulation. He was professional and explained everything in detail of what was work was going to be done and how long it would take. We scheduled within a week at a reasonable price. His crew were neat, organized and finished on time! We were notified of some extra things that were found while they were on the job but were not pressured to have those things done. We recommend American Attic to friends or family and would definitely use them again."
+52
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