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Top-Rated Insulation pros in San Gregorio - Updated Nov 2026

Avatar for Attic Pros
Attic Pros
4.9(
233
)

Serving San Gregorio, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2012

Free estimates

Small jobs welcome

"I was looking online for insulation contractors, and found Attic Pros, Chris and his team arrived on time installed brand new attic insulation, cleaned our Crawl space and installed insulation, they took photos before and after. I am very happy with the work was completed defiantly recommend these guys."
Blow-In Attic Insulation
San Jose, CA Attic Insulation Installation
Danville, CA Vapor Barrier Installation
Mill Valley, CA Crawlspace Cleaning
Benicia, CA Attic Cleaning & Insulation

+3137

Response time11 hrs
Response rate94%
139 neighbors recently requested a quote
Avatar for American Attics
American Attics
5.0(
8
)
Insulation - Install or Upgrade

Serving San Gregorio, 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."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+52

Response time2 days
Response rate100%
9 neighbors recently requested a quote
Avatar for Insulation Alliance
Insulation Alliance
5.0(
2
)
Insulation - Install or Upgrade

Serving San Gregorio, CA and surrounding areas

Approved

In business since 2017

Free estimates

Warranties offered

"When Insulation Alliance came, they were very professional. They laid down plastic everywhere in the hallway and the bedroom. They cleaned out the whole attic. They took out the old insulation and put in the new Insulation which was R 44. They cleaned up everything and everything was clean when they left. They also sanitized the attic. You will not be disappointed that you hired."
Attic Cleaning
Attic, Crawl Space and Basement Decontamination
ATTIC, WALL, CRAWL SPACE INSULATION
THERMAL INSPECTION
REMOVING INSULATION

+86

11 neighbors recently requested a quote
Recommended by50%of homeowners
Avatar for Air Sharks
Air Sharks
5.0(
12
)

Serving San Gregorio, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"I was extremely impressed with the service provided by Air Sharks, who replaced my aging furnace and damaged heat ducts. Elizabeth provided a detailed explanation in a friendly, professional and understandable way. Pricing seemed reasonable, and was 25% below a previous estimate. Daniel and his crew did a fantastic job removing and replacing the new furnace and the duct system in a very tight crawl space. They left the furnace looking absolutely beautiful and clean. I highly recommend them"
Daikin Heat Pump Install
Daikin Heat pump Install and Duct Work
Before picture.
BEFORE
Daikin Heat Pump Install

+22

Response time1 day
Response rate100%
21 neighbors recently requested a quote
Avatar for Tri County Insulation
Tri County Insulation
4.6(
19
)
Insulation - Install or Upgrade

Serving San Gregorio, CA and surrounding areas

In business since 1974

Credit card accepted

"The sales rep, Bryan, went above and beyond to answer all my zillion questions and concerns. He was responsive, knowledgeable and shared his expertise in not only insulation, but all in LED canned lights and dimmers. He was amazing and I would only ask for him again. I plan to refer others to him also in the near future. The installers were good too, letting me climb the ladder and look at the work, cleaning out the old insulation and advising me they found no termites or rodent droppings. I wish they would have vacuumed the bedroom where they brought in a lot of dirt on the carpet, and also used the shop vac in the garage afterwards, as I had to clean up afterwards, which took me an extra hour. However, overall, I was pleased."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+4

Recommended by94%of homeowners
Avatar for Attic Masters
Attic Masters
4.7(
33
)
Insulation - Install or Upgrade

Serving San Gregorio, CA and surrounding areas

In business since 2010

Free estimates

Credit card accepted

"We had an inspection and we had to replace the insulation in the attic. We were able to get a good deal from this company after we reached them via a referral. 
The work that they did was very good and professional. there were several employees at the house for the 2 days work that they did. We do recommend this company for any insulation replacement that you may need.
"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+7

Recommended by95%of homeowners
Avatar for SDI Insulation, Inc.
SDI Insulation, Inc.
4.1(
55
)

Serving San Gregorio, CA and surrounding areas

In business since 1975

Free estimates

Warranties offered

"Very organized customer service communication with different contacts and relationship management from estimate to job installation. Also very competitive pricing!! They make suggestions on what areas need insulation and what type of insulation is needed."
Spray Foam Insulation
Cooton Batts Insulation
Fireplace Sales and Install
Interior Insulation
Interior Insulation

+22

Response time2 days
Recommended by100%of homeowners
Avatar for MENACI DESIGN DRYWALL The King Of Drywall
MENACI DESIGN DRYWALL The King Of Drywall
4.8(
146
)
Insulation - Install or Upgrade

Serving San Gregorio, CA and surrounding areas

In business since 1993

Free estimates

Emergency services offered

"These guys are fantastic! Normally I'm used to crews working from 7am to 2pm. On day one, the Menaci guys worked from 8am till almost 7pm! I had to tell the guys to go home and be with their families for dinner. They wanted to make sure they finished hanging all the board and doing the first couple coats in day one. So they worked until they reached their goal. And they didn't do it fast and sloppy. It was perfect. The whole job turned out better than I had expected. They went above and beyond standard mudding. They completely coated every surface of the drywall with mud, rendering the smoothest walls I now have in my house!"
Drywall Project
Drywall Project
Drywall Project
Drywall Project
Wood Paneling Removal

+28

Recommended by98%of homeowners
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FAQs for insulation service projects in San Gregorio, CA

Old insulation should be removed when it shows damage, contamination, or heavy deterioration. If you notice water stains, rodent droppings, mold, or large gaps, plan on taking it out to protect your home’s energy performance and indoor air quality. Removing compromised material eliminates health hazards, cuts energy loss, and sets the stage for a safer, more efficient attic—all while keeping utility bills in check.

R-value measures how well insulation resists heat flow—the higher the number, the better it slows heat transfer. The right R-value keeps your home warmer in winter and cooler in summer, saving energy year-round. Match the rating to your climate zone and have a pro verify performance over time, because moisture or settling can lower R-value and cut efficiency.

Attic insulation can stay in place for 80 to 100 years, but its performance often drops after the first 15. As dust, moisture, or mold build up, the material loses R-value and allows heat to escape. Schedule periodic inspections so a pro can tell you when replacement makes sense—helping you keep energy bills down and indoor comfort up.

You can over-insulate an attic. Beyond the recommended R-value, extra layers don’t add efficiency and can trap moisture, leading to mold or reduced performance. A local insulation pro can measure current levels, confirm the right target for your climate, and advise on any adjustments so you avoid future energy or maintenance headaches.

Insulation can be damaged by mold, pests, water leaks, or accidental electrical contact. When the material is compromised, it loses R-value and can introduce health hazards. Removing and replacing affected sections restores efficiency, while routine inspections from a qualified pro help you catch problems early and keep your attic safe and energy-smart.

The San Gregorio, CA homeowners’ guide to insulation services

From average costs to expert advice, get all the answers you need to get your job done.

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