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24 contractors listed · 12 in Baltimore · 5 open 24/7 · 13 open weekends · 19 rated 4.5+
Data verified October 18, 2026
The 24 contractors listed for Baltimore, MD 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.
12 of the 24 contractors we list are based in Baltimore; the other 12 serve Baltimore from towns including Towson (6 mi), Pikesville (8 mi) and Owings Mills (13 mi). The contractors on this page are rated from 4.1 to 5.0 across 4,094 reviews; 20 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (88%), quality (86%) and responsiveness (80%). 5 are open around the clock; 13 are open on Saturdays and 8 on Sundays. The services the contractors on this page list most often on their websites are gutters (5), siding (5), roofing (4), decks (3) and attic insulation (2). 11 show a license on their websites and 10 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 1997. 5 offer emergency call-outs; 11 offer financing or payment plans; 16 give free estimates; 6 are family- or locally-owned and 5 list 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.
