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Find Insulation pros in San Gregorio

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

"Melesio and his team did an excellent job removing old insulation/cleaning, rodent proofing/sealing, and installing new insulation all in one day."
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%
152 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
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+52

Response time2 days
Response rate100%
10 neighbors recently requested a quote
Avatar for USAttic Insulation
USAttic Insulation
5.0(
2
)

Serving San Gregorio, CA and surrounding areas

Approved

In business since 2018

Free estimates

Warranties offered

"wilson and his team arrived at 9am the early side of the window provided. He quickly started his set up began what would turn out to be a long day for his team. Provide clean out of old existing insulation, sanitized attic and sealed and prepped for attic fan and new insulation. Wilson and his team took pictures of all stages of work. Cleaned left area as if they never had been there."
Blown-In Insulation
Cleaning Air sealing
Blown-In Insulation
Blown-In Insulation
Cleaning

+3

10 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

Air Sharks delivers expert HVAC services to homeowners across the South Bay, including installation, repair, and maintenance of top brands like Daikin and Lennox. We also specialize in improving indoor air quality with professional ductwork inspection and cleaning.\n\nOwner Khaled Alsaka built Air Sharks on a passion for transforming the HVAC experience through education, collaboration, and top-tier products. We provide personalized consultations and tailored heating and cooling solutions, taking pride in our craftsmanship, attention to detail, and commitment to five-star service.

Daikin Heat Pump Install
Daikin Heat pump Install and Duct Work
Before picture.
BEFORE
Daikin Heat Pump Install

+22

Response time1 day
Response rate100%
22 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."
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+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 infestation problem at the attic that required us to replace the insulation. Marcus from Attic Masters came over to check and to try and save anything from the insulation. According to him, it was worth it to just replace the whole attic insulation and to solve this problem once and for all. Marcus did his best to give us the best price he could and we decided to go ahead and do it.
Marcus worked at our house for 2 days in which he removed all the old one on the first day and the following day he placed the new insulation and the problem was over. The work that he did was professional and clean. All the old insulation was removed in bags and there was no dust or dirt in the house. 


"
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+7

Recommended by95%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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