Spray Foam Insulation Licensing in All 50 States

No SPF-specific license; general contractor or home-builder licensure applies above set project thresholds.

Registers a distinct "Acoustical and Insulation Contractor" specialty trade, separate from general contracting.

Requires a dedicated Insulation classification (C-40/R-40/CR-40) for all insulation work, no dollar-value exemption.

No insulation-specific classification; a general contractor license is required above set commercial and residential thresholds.

CSLB's C-2 "Insulation and Acoustical Contractor" classification is the relevant license; a general B license does not cover it.

No statewide general contractor or insulation license exists — regulation is entirely local, city by city.

Home Improvement Contractor (HIC) registration covers insulation work; a 2013 foam-material law does not apply to SPF.

No exam-based contractor license; all construction contractors register with the state before starting work.

No standalone insulation license; SPF work is typically performed under a Certified or Registered general/building contractor license.

A "Drywall, Insulation, Studs & Acoustical" specialty category is exempt from general licensure when work stays within that scope.

DCCA's Contractors License Board issues a specialty "C" classification believed to cover acoustical and insulation work.

No competency exam; Idaho uses a registration system rather than a tested license for construction contractors.

No statewide general contractor or insulation license — licensing is local/municipal only, and varies widely by city.

No statewide general contractor license exists; licensing (where it exists at all) is set city by city.

Broad contractor registration (not an exam license) is required for anyone earning $2,000+/year from construction work.

No statewide general contractor license; licensing is entirely local/county, and only roofing has a statewide registration.

The state licensing board covers only electrical, plumbing, HVAC, boiler, and fire-suppression trades — not insulation or general contracting.

"Insulation" is a named specialty classification under the state contractors board, required above set project thresholds.

No state license today; a new law naming insulation work takes effect January 1, 2027 for residential projects over $15,000.

No SPF-specific license; the statewide Home Improvement Commission (MHIC) license covers insulation work on 1–3 unit residences.

The Construction Supervisor License offers a distinct "Insulation" specialty restriction, plus separate HIC registration for residential work.

Insulation is a named trade code ("G") under the Residential Maintenance & Alteration Contractor license, with its own exam.

Insulation-only contractors are generally exempt from state licensing; adding other specialty work changes that.

The state contractors board lists two distinct insulation classifications, split by application type.

No statewide general contractor license exists; licensing is entirely local, and only electrical work is state-licensed.

No competency license exists; a Construction Contractor Registration tied to workers'-comp compliance is the only state requirement.

Statewide Contractor Registration (not an exam license) covers essentially all contractors, insulation included.

The state contractors board's C-15c classification covers insulation installation as a named specialty.

No state general contractor license of any kind; New Hampshire licenses only a handful of specific trades, none of which is insulation.

Home Improvement Contractor (HIC) registration explicitly names insulation as covered work, with real insurance minimums.

The GS-1 "Acoustical Insulation and Insulation" specialty classification explicitly covers urethane foam.

No statewide general contractor license exists; licensing is set locally, and requirements differ by county and city.

An "S(Insulation)" specialty designation can be added to a general contractor license, above a $30,000 project threshold.

Licensing is based purely on contract dollar value, not trade type — insulation is not called out separately.

The state licensing board covers only five trades (electrical, HVAC, plumbing, hydronics, refrigeration) — insulation isn't one of them.

No statewide general contractor license; the state board licenses only plumbing, electrical, mechanical, roofing, and inspectors.

A Residential Specialty Contractor (RSC) endorsement covering insulation is required separately from a general contractor license.

Home Improvement Contractor (HICPA) registration, not an exam license, covers insulation once volume passes $5,000/year.

Insulation is explicitly named as a trade requiring registration under a universal contractor registration system.

Insulation falls under the "Nonstructural Renovation" specialty category, which now requires a technical exam.

No state competency license for general or insulation contracting; a statewide excise tax license is the closest thing to a universal requirement.

General building contractor licensure applies above $25,000; the exact insulation classification name needs direct verification.

No statewide general contractor or insulation license; regulation is local/county, and manufacturer certification is commercial (not legal).

DOPL's S250 "Insulation Contractor" classification requires a 25-hour prelicense course and exam.

A residential contractor registry (not licensure) is mandatory; consumer-disclosure rules trigger above $2,500.

DPOR's Board for Contractors has an "Insulation and Weather Stripping" specialty classification, addable to any license class.

L&I registers ~63 specialty trades including insulation, with real published bond and insurance minimums.

The state contractor licensing board lists "Insulation" as Specialty code 026, an untested specialty (business & law exam only).

A Dwelling Contractor Qualifier certification is required to pull permits for 1-2 family dwelling work, and its categories explicitly include insulation.

No statewide contractor license of any kind exists except electrical; insulation contracting is regulated locally, if at all.