Verified St. Louis insulation companies for attic insulation, spray foam, and energy assessments - serving Clayton, Kirkwood, Webster Groves, Chesterfield, Ballwin, University City and beyond.
The right insulation contractor measures your current R-value, quotes the actual improvement, and is honest about payback. In Florida, attic insulation is one of the highest-return AC upgrades.
Brick century homes, real basements, and four hard seasons: St. Louis is a market where knowing old construction is the whole job. When you compare insulation companies in St. Louis, ask every one of them the same three questions: are you licensed and insured for this exact work, who is actually showing up (your crew or a sub), and what does the warranty cover in writing.
Searching for insulation companies near me in St. Louis? Everyone ranked below serves St. Louis and the surrounding neighborhoods, including Clayton, Kirkwood, Webster Groves, Chesterfield, Ballwin, University City. Check the address and service area on a listing before you call, because the closest one is not always the one a search engine puts first.
Based on Google ratings and review volume as of September 2026, the top rated insulation companies in St. Louis are West County Insulation, iFOAM Insulation of O'Fallon, Air Comfort Service, Inc.. See the live ranked list, ratings, and contact details on this page.
Every company ranked on this page serves St. Louis and the surrounding area, including Clayton, Kirkwood, Webster Groves, Chesterfield, Ballwin, University City. Open any listing for its address, phone number and service area, then call the two or three closest to you. Distance is worth checking yourself: the nearest insulation company is not automatically the best one, so this page ranks on rating and review volume first and leaves proximity to you.
The right insulation contractor measures your current R-value, quotes the actual improvement, and is honest about payback. In Florida, attic insulation is one of the highest-return AC upgrades.
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Claim your free listingPrefer to talk? Call or text the Top Rated directory on (813) 454-0813. This is our number, not the number of any business listed here.