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  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon95
    Verified insulation services reviews

Find Insulation pros in Castro Valley

Avatar for Bell Brothers Plumbing Heating & Air

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Approved Pro

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Approved Pro
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
1954 years of experience

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023


Avatar for Attic Pros

Attic Pros

4.82(
85
)
Approved Pro

Attic Pros

4.82(
85
)
Approved Pro
Super Service Award
Customers say: Super punctual
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
2009 years of experience

Attic Pros is your go-to attic insulation installation and rodent removal contractor in San Francisco Bay Area. We offer a wide range of services for rodent removal, attic cleaning, insulation replacement, and crawl space cleaning to meet all your needs. Our team is dedicated to providing you with the best possible customer service. Contact us today for a free estimate!

"All done nicely"

Mandeep R on February 2025

Attic Pros is your go-to attic insulation installation and rodent removal contractor in San Francisco Bay Area. We offer a wide range of services for rodent removal, attic cleaning, insulation replacement, and crawl space cleaning to meet all your needs. Our team is dedicated to providing you with the best possible customer service. Contact us today for a free estimate!

"All done nicely"

Mandeep R on February 2025


Bay Valley Insulation Inc

4.88(
32
)
Approved Pro

Bay Valley Insulation Inc

4.88(
32
)
Approved Pro
Customers say: Quick response
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers
1988 years of experience

Insulation of New and Existing Construction throughout the Greater Bay Area. Additional phones - (510) 440-8489, (800) 281-0401. For best results when requesting a quote please include the following: 1-Your phone number 2-Approximate Square Footage of Job. 3-Clearance of Attic at Peak 4-Approximate thickness of current insulation 5-Age of home 6-Is this a one or two story home

"Happy with everything from start to finish. Quality work and great customer service including filing for the California rebates!"

Bryan C on July 2024

Insulation of New and Existing Construction throughout the Greater Bay Area. Additional phones - (510) 440-8489, (800) 281-0401. For best results when requesting a quote please include the following: 1-Your phone number 2-Approximate Square Footage of Job. 3-Clearance of Attic at Peak 4-Approximate thickness of current insulation 5-Age of home 6-Is this a one or two story home

"Happy with everything from start to finish. Quality work and great customer service including filing for the California rebates!"

Bryan C on July 2024


Avatar for Eagle Shield

Eagle Shield

4.38(
13
)
Approved Pro

Eagle Shield

4.38(
13
)
Approved Pro
Customers say: True professional
2003 years of experience
Free onsite estimate

Eagle Shield specializes in prioritizing energy upgrades so that homeowners get the biggest bang for their buck. In order to keep heat out of your home’s Attics, Garages, Crawl Spaces, Ducts, Out Buildings and more during the summer season, but keep it inside during winter months, you need quality insulation. Here at Eagle Shield we have three of the very best options available; Reflective or Radiant Barrier insulation, Blown-In, and Laid or Rolled insulation, otherwise known as “Batt and Roll” or “Blanket” insulation. And in each of those three options, we carry the very best quality products. So, why wait? Start saving money and living more comfortably now! Let our Northern California energy solutions experts show you how to optimize your energy usage all year long. Contact us today to get started!

"They did a good job and he's a great guy."

Chauncey W on July 2022

Eagle Shield specializes in prioritizing energy upgrades so that homeowners get the biggest bang for their buck. In order to keep heat out of your home’s Attics, Garages, Crawl Spaces, Ducts, Out Buildings and more during the summer season, but keep it inside during winter months, you need quality insulation. Here at Eagle Shield we have three of the very best options available; Reflective or Radiant Barrier insulation, Blown-In, and Laid or Rolled insulation, otherwise known as “Batt and Roll” or “Blanket” insulation. And in each of those three options, we carry the very best quality products. So, why wait? Start saving money and living more comfortably now! Let our Northern California energy solutions experts show you how to optimize your energy usage all year long. Contact us today to get started!

"They did a good job and he's a great guy."

Chauncey W on July 2022


Avatar for American Attics

American Attics

5.00(
3
)
Approved Pro

American Attics

5.00(
3
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
Free onsite estimate

The business specializes in providing insulation solutions aimed at optimizing energy efficiency for residential properties. We offer a range of insulation products and services tailored to different types of homes and climates, helping homeowners reduce energy consumption and lower utility bills while enhancing comfort and sustainability.

"The work was performed to my satisfaction. The Sam and the crew arrived on time and explained what was going to happen. The crew prepared the house to minimize any dust and went to work. The job was completed in two days. There were a couple of issues during the job, which were addressed in a timely manner. Overall, I am very happy with the work and would recommend American Attics."

Jeff L on June 2024

The business specializes in providing insulation solutions aimed at optimizing energy efficiency for residential properties. We offer a range of insulation products and services tailored to different types of homes and climates, helping homeowners reduce energy consumption and lower utility bills while enhancing comfort and sustainability.

"The work was performed to my satisfaction. The Sam and the crew arrived on time and explained what was going to happen. The crew prepared the house to minimize any dust and went to work. The job was completed in two days. There were a couple of issues during the job, which were addressed in a timely manner. Overall, I am very happy with the work and would recommend American Attics."

Jeff L on June 2024


Avatar for Insulation Alliance

Insulation Alliance

5.00(
2
)
Approved Pro

Insulation Alliance

5.00(
2
)
Approved Pro
2017 years of experience
Free onsite estimate

In Business Since 2017 Insulation Alliance is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. Insulation Alliance is a leader in providing our customers with the highest quality products and craftsmanship in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

"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."

Gloria l on January 2024

In Business Since 2017 Insulation Alliance is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. Insulation Alliance is a leader in providing our customers with the highest quality products and craftsmanship in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

"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."

Gloria l on January 2024


Attic Cleaning Service

5.00(
1
)
Approved Pro

Attic Cleaning Service

5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Transform your living spaces with our Attic Cleaning Services in Oakland, CA. Specializing in insulation installation, duct cleaning, and comprehensive attic solutions. Enhance energy efficiency and indoor air quality with our expert services. We serve in Oakland, CA, Piedmont CA; Albany CA; Orinda CA; Moraga Town CA; El Sobrante CA; and the surrounding areas. Insulation Contractor, Insulation Service, Floor Insulation Installation, Attic Cleaning and Insulation, Insulation Removal and Installation Professional Insulation Installation For more information visit our website: https://insulation-oakland.com/ We also accept the following payment methods: Cash

"Juan and his crew were amazing, they did everything as asked. I wasn't exactly an easy customer as I had a custom layout for my airducts and they knocked it out perfectly within a day when other estimates said 2-3 days and for a fraction of the cost. Started out as a DIY, so I had most of the material and they made it work."

Richard S on August 2024

Transform your living spaces with our Attic Cleaning Services in Oakland, CA. Specializing in insulation installation, duct cleaning, and comprehensive attic solutions. Enhance energy efficiency and indoor air quality with our expert services. We serve in Oakland, CA, Piedmont CA; Albany CA; Orinda CA; Moraga Town CA; El Sobrante CA; and the surrounding areas. Insulation Contractor, Insulation Service, Floor Insulation Installation, Attic Cleaning and Insulation, Insulation Removal and Installation Professional Insulation Installation For more information visit our website: https://insulation-oakland.com/ We also accept the following payment methods: Cash

"Juan and his crew were amazing, they did everything as asked. I wasn't exactly an easy customer as I had a custom layout for my airducts and they knocked it out perfectly within a day when other estimates said 2-3 days and for a fraction of the cost. Started out as a DIY, so I had most of the material and they made it work."

Richard S on August 2024


Los Gatos Roofing

4.89(
211
)

Los Gatos Roofing

4.89(
211
)
Customers say: Super punctual
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers

Excellence in Roofing is more than just a tag line at Los Gatos Roofing; it is a way of doing business. With a long and storied history of service in the Bay Area, the Los Gatos Roofing family demands a strong commitment to customer service and the highest quality standards of craftsmanship. Additional address - PO Box 1726, Los Gatos, CA 95031. Additional phone number - (408) 395-9091. Additional contact names - Gary Radonich, Cameron Radonich, Randy Brown.

"This was a small job, but I was treated well. Their price was good, they were professional and prompt. I could not ask for more."

Andrew L on July 2022

Excellence in Roofing is more than just a tag line at Los Gatos Roofing; it is a way of doing business. With a long and storied history of service in the Bay Area, the Los Gatos Roofing family demands a strong commitment to customer service and the highest quality standards of craftsmanship. Additional address - PO Box 1726, Los Gatos, CA 95031. Additional phone number - (408) 395-9091. Additional contact names - Gary Radonich, Cameron Radonich, Randy Brown.

"This was a small job, but I was treated well. Their price was good, they were professional and prompt. I could not ask for more."

Andrew L on July 2022


Avatar for Guardian Protection

Guardian Protection

4.74(
2,120
)

Guardian Protection

4.74(
2,120
)
Customers say: Super punctual
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers

Protecting homes and businesses since 1950, Guardian Protection is one of the nation's largest and most highly regarded security companies. We provide smart technology, 24/7 professional monitoring, and peace of mind to hundreds of thousands of customers. Our products are installed by experts, monitored by real people, and truly make a difference. We do what we do because of one simple truth: life is better when it's safe.

"We hired Guardian to install our security system at our Washington, DC, business. The service and quality of the work was horrible. We had cameras and an alarm system installed; it was a relatively large system. They outsource most of the work to various vendors. They could not manage their vendors; what was supposed to take a week took two months. The sales rep did not return calls, and you could never get anyone in management on the phone. Random people would show up at unannounced times. The few things that an actual Guardian employee did were they made a huge mess of our newly remodeled office and were rude to our staff. We have offices in five markets across the US and have high security at each; we have never had such a poor experience."

William M on December 2024

Protecting homes and businesses since 1950, Guardian Protection is one of the nation's largest and most highly regarded security companies. We provide smart technology, 24/7 professional monitoring, and peace of mind to hundreds of thousands of customers. Our products are installed by experts, monitored by real people, and truly make a difference. We do what we do because of one simple truth: life is better when it's safe.

"We hired Guardian to install our security system at our Washington, DC, business. The service and quality of the work was horrible. We had cameras and an alarm system installed; it was a relatively large system. They outsource most of the work to various vendors. They could not manage their vendors; what was supposed to take a week took two months. The sales rep did not return calls, and you could never get anyone in management on the phone. Random people would show up at unannounced times. The few things that an actual Guardian employee did were they made a huge mess of our newly remodeled office and were rude to our staff. We have offices in five markets across the US and have high security at each; we have never had such a poor experience."

William M on December 2024


Avatar for Attic Masters insulation Services

Attic Masters insulation Services

4.87(
97
)

Attic Masters insulation Services

4.87(
97
)
Customers say: Super punctual
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers

Attic Masters Insulation Services specializes in providing high-quality insulation solutions for residential properties. Our services include insulation removal, installation, and attic cleaning, focusing on energy efficiency and comfort. With a commitment to eco-friendly materials and practices, we ensure environmentally responsible solutions that enhance indoor air quality. Our experienced team assesses your specific needs and offers customized insulation options tailored to your home. We pride ourselves on delivering reliable service, customer satisfaction, and maintaining a clean work environment. Choose Attic Masters to improve your home’s energy efficiency and comfort while reducing energy costs for a healthier living space.

"i can only say good things about working with Attic masters. Great communication, They came on time, protected our floors and hallway from insulation dust, took pictures of the before and after for us so we can get the rebate. overall, very easy and stress free company to work with. I would definitely use again, it was a pleasure to work with true professionals."

Victor H on October 2021

Attic Masters Insulation Services specializes in providing high-quality insulation solutions for residential properties. Our services include insulation removal, installation, and attic cleaning, focusing on energy efficiency and comfort. With a commitment to eco-friendly materials and practices, we ensure environmentally responsible solutions that enhance indoor air quality. Our experienced team assesses your specific needs and offers customized insulation options tailored to your home. We pride ourselves on delivering reliable service, customer satisfaction, and maintaining a clean work environment. Choose Attic Masters to improve your home’s energy efficiency and comfort while reducing energy costs for a healthier living space.

"i can only say good things about working with Attic masters. Great communication, They came on time, protected our floors and hallway from insulation dust, took pictures of the before and after for us so we can get the rebate. overall, very easy and stress free company to work with. I would definitely use again, it was a pleasure to work with true professionals."

Victor H on October 2021

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Insulation questions, answered by experts

One of the biggest disadvantages of glass garage doors is that they are not the best at insulating your garage. In the summer, heat can enter through the glass, while in the winter, heat can escape through the glass, increasing your electricity and gas bills as you crank up your HVAC unit. You can help mitigate the poorer insulation by investing in insulated glass and insulating your garage.

While the ideal temperature for your garage is partially based on your preferences for a comfortable garage space, you'll still want to maintain a temperature between 40 degrees and 68 degrees Fahrenheit to protect your belongings and vehicles. If you are unable to maintain temperatures that fall within this range, then you may want to consider installing a heater in your garage to prevent temperatures from dropping below 40 degrees.

Water heater blanket prices range from $20 to $40 on average, though you typically won’t need to spend more than $30 for all the tools and materials required for installation—which include the blanket itself, heavy-duty scissors, and electrical tape. Blankets with higher R-values will also be slightly higher in price.

If you feel your energy bills are too high or your HVAC system is working harder than necessary to maintain the correct temperature in your home, you may have an under-insulated home. If you’re unsure, consider having your system’s efficiency assessed by a local independent energy auditor.

R-30 insulation is better for higher thermal resistance, but whether it’s "better" depends on the application. R-30 is much thicker and suited for areas like attics or floors in cold climates, where more insulation is required. R-13, on the other hand, is thinner and works well for 2x4 walls or milder climates where less insulation is sufficient. Choosing between R-13 and R-30 depends on the area being insulated and the climate. For example, R-30 provides more insulation but may not fit everywhere in your home.

The Castro Valley, CA homeowners’ guide to insulation services

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

What do you need done? We’ll find top pros.
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