Insulation doesn't always get the spotlight — but the contractors who specialize in it are running some of the most sophisticated operations in the trades. From sprawling national installers managing hundreds of crews to sharp regional players dominating their local markets, the companies on this list represent the backbone of building envelope performance across the country.

Every year, Walls & Ceilings takes stock of who's moving the needle in insulation installation. This year's Top 25 was compiled from industry intelligence, industry research, and publicly available data — because, in a sector where most players are privately held, revenue figures are rarely provided willingly.

Walls & Ceilings is published by BNP Media, which is marking 100 years of serving the industries that build, design and manufacture. BNP is also home to Engineering News-Record (ENR), long recognized for its annual rankings of top contractors and designers in the construction industry. Watch for future W&C content that explores ENR's Top 600 Specialty Contractors list for an in-depth look at what the data reveals for our industry.

Where exact sales data was unavailable, estimates were drawn from third-party sources, including Growjo, Zippia, CompWorth, and IncFact, along with SEC filings for publicly traded companies. Consider those figures informed approximations rather than audited financials.

What the numbers do tell us: this is a healthy, consolidating industry. Private equity and strategic acquirers are circling. National platforms like TopBuild and Installed Building Products (IBP) continue to grow through acquisition, while regional independents are holding their own — and in many cases, thriving.

The contractors on this list were identified through industry relationships, trade channels and editorial research. They represent scale, longevity and, in several cases, the kind of quiet dominance that doesn't make headlines but absolutely moves product.

National Platforms Continue to Expand

Two companies continue to define the upper tier of the insulation installation market: TopBuild and Installed Building Products.

TopBuild, through its TruTeam installation division, leads the 2026 ranking with an estimated $3.3 billion in insulation installation revenue. The Florida-based company operates hundreds of installation branches nationwide and serves both residential and commercial construction markets.

Installed Building Products follows closely with approximately $2.5 billion in insulation-related revenue. IBP has built one of the most expansive contractor networks in the country through an aggressive acquisition strategy, adding regional installers across multiple markets.

Both companies have reshaped the industry over the past decade by consolidating smaller contractors and creating national installation platforms capable of serving large homebuilders and commercial contractors across multiple regions.

Regional Contractors Still Dominate Local Markets

Beyond the national platforms, the industry remains highly fragmented and regional in nature.

Companies such as SEI Group, 31-W Insulation, Alcal Specialty Contracting and American National Insulation demonstrate how regional contractors can scale operations while maintaining strong geographic focus.

Atlanta-based SEI Group stands out among independents, operating dozens of locations and serving major builder markets across the Southeast and Midwest.

Many firms on the list focus heavily on residential construction, installing fiberglass, spray foam and other systems for production homebuilders. Contractors such as Arango Insulation, Cohen’s Insulation and Rockweiler Insulation continue to expand alongside housing demand.

Another notable trend is the emergence of franchise systems and contractor networks within the insulation sector. Companies such as Koala Insulation and USA Insulation operate franchise models focused heavily on retrofit insulation and energy-efficiency upgrades for existing homes. Because these organizations aggregate revenue across independently owned franchises rather than operating as single contractor entities, they aren't directly comparable to the companies ranked here — but their growth reflects real momentum in the residential retrofit market.

Industrial and Commercial Scale

The 2026 list also reflects the growing importance of commercial and industrial insulation contractors.

Companies such as Performance Contracting Inc., Irex Contracting Group and Advanced Industrial Services highlight the scale and specialization required in industrial and large-scale commercial projects. These firms often operate fewer locations but manage complex, high-value work in sectors such as energy, manufacturing and infrastructure.

This segment operates on a fundamentally different model from residential installation, but remains a critical part of the overall insulation market.

Market Drivers

Several factors are expected to shape the insulation installation market in the coming years:

• Housing starts and builder demand
• Energy-efficiency regulations and incentives
• Ongoing industry consolidation
• Growth in retrofit insulation and weatherization work

Inside the Insulation Contractor Market

Notes

* Revenue reflects estimated insulation installation activity and excludes distribution and other business segments for diversified companies.

Methodology

The Walls & Ceilings Top 25 Insulation Contractors ranking is based on estimated 2025 insulation installation revenue. Because most contractors in the industry are privately held and do not publicly disclose revenue figures, estimates were compiled using a combination of industry intelligence and third-party data sources.