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1 of these contractors is based in San Mateo; the others serve San Mateo from towns including San Jose (31 mi), San Francisco (16 mi) and South San Francisco (9 mi).
9 open weekends · 20 rated 4.5+ · 15 show a license
Data verified October 15, 2026
The 24 contractors listed for San Mateo, CA insulate attics, walls, crawl spaces and rim joists. Details under each one about materials, hours and the services advertised are copied from the company's own site; star ratings and comments come from public reviews.
The 24 contractors on this page are rated from 4.1 to 5.0 across 1,576 reviews; 10 have 50 or more reviews and 20 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (89%), responsiveness (82%) and quality (81%). The topics that come up most in reviews of the contractors on this page are "price", "communication" and "estimates". 6 are open on Saturdays and 5 on Sundays. The services the contractors on this page list most often on their websites are air duct cleaning (2), attic insulation (2) and roof maintenance (2). 15 show a license on their websites; 2 list staff certifications (GAF) and 7 have a BBB rating of A or A+. Domain records put 16 websites of the contractors on this page at ten or more years old; the oldest dates from 1998. 4 offer financing or payment plans; 15 give free estimates; 8 are family- or locally-owned and 1 lists coupons or special offers. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
A website is on file for all 24 contractors here. Use it to see which materials they actually install, since a firm that only sprays foam will recommend foam. A contractor with no site is not automatically worse, but you will have to ask on the phone what the site would have told you.
