4.6 
176 *The Angi rating for Drywall Insulation companies in Castro Valley, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Drywall Insulation needs.
*The HomeAdvisor rating for Drywall Insulation companies in Castro Valley, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Drywall Insulation needs.
Last update on June 20, 2026
Serving Castro Valley, 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 Castro Valley, CA and surrounding areas
Approved
In business since 2017
Free estimates
Offers commercial services
"professional and fast. We use this company for close cell insulation. Really great customer service also. I highly recommend them."
Serving Castro Valley, 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 Castro Valley, 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 Castro Valley, 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 Castro Valley, CA and surrounding areas
Approved
In business since 2008
Free estimates
Emergency services offered
Noble Insulation Inc. is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 18 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today! \n
Serving Castro Valley, CA and surrounding areas
Approved
In business since 2024
Free estimates
Credit card accepted
CA Attic Solutions \nAt CA Attic Solutions, we are dedicated to providing top-notch insulation solutions that enhance your homes comfort, efficiency, and overall quality of life. Founded on the principles of excellence, integrity, and customer satisfaction, we have built a reputation for delivering reliable, high-performance services tailored to meet your unique needs. \n \nWe are committed to offering exceptional service, using the latest technology and highest-quality materials to ensure that your home remains comfortable and efficient throughout the year. \n \nhttps://californiaatticsolutions.com/
Serving Castro Valley, CA and surrounding areas
Approved
In business since 2008
Free estimates
Warranties offered
"The technician explained every step by step and the company used very good quality materials they give me a one year warranty for rodents and very good warranty for the insulation l think is a very good company l really recomended"
+26
Serving Castro Valley, 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 Castro Valley, 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
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