Partial Requirements

Mold licensing in New Hampshire.

Research last verified 2026-06. Confirm current requirements directly with the state before beginning work.

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Inspection and assessment

License required

ACAC certification required for residential mold assessment — commercial is unregulated.

  • 01New Hampshire requires ACAC (American Council for Accredited Certification) credentials for mold assessors performing residential property inspections under RSA 310-A:189–189-d.
  • 02Accepted credentials: ACAC Council-certified Mold Inspector (CMI) or Council-certified Indoor Environmentalist (CIE).
  • 03ACAC credentials require documented field experience, relevant education or training, and passing a proctored exam.
  • 04Estimated cost: ~$600 initial (ACAC exam fee + application); 2-year renewal cycle.
  • 05Commercial mold assessment is NOT regulated — the certification requirement applies to residential properties only.
  • 06A 2026 legislative attempt to repeal these requirements (HB1126) was defeated by the NH Senate on March 26, 2026 — current law remains in force.
  • 07Statutory citation: RSA 310-A:189-b defines "mold assessment" to explicitly include the collection of a mold sample for analysis.
License type
ACAC CMI or CIE Certification
Estimated cost
~$600 initial (exam + application)
Renewal
Every 2 years
Exam
Required

Regulating body: NH Office of Professional Licensure and Certification (OPLC)

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Mold remediation

Not required

No state license required for mold remediation.

  • 01New Hampshire has no state licensing requirement for mold remediation.
  • 02Home Improvement Contractor (HIC) registration may apply for residential jobs valued at $1,000 or more.
  • 03Voluntary certification (ACAC CMR or IICRC AMRT) is recommended for credibility.
  • 04Check with the NH Office of Professional Licensure and Certification for any regulatory updates.

Regulating body: NH Office of Professional Licensure and Certification (OPLC)

Lab pathway

Air sampling and third-party analysis

License required

Sample collection for residential properties explicitly requires ACAC certification — no third-party lab exemption.

  • 01RSA 310-A:189-b explicitly includes "(3) The collection of a mold sample for analysis" in the definition of mold assessment requiring ACAC certification.
  • 02Sending samples to an AIHA-accredited third-party lab does not create a collection-only exemption — the person collecting the sample needs an ACAC CMI or CIE credential.
  • 03This requirement applies to residential properties only — commercial mold sampling is NOT regulated in New Hampshire.
  • 04HB1126 (a 2026 repeal attempt) was killed by the NH Senate on March 26, 2026 — current law stands.
  • 05Minimum credential: ACAC CMI (Council-certified Mold Inspector) — requires documented field experience, proctored exam, and approximately $600 initial cost.

This summary addresses the spore-trap collection, accredited third-party lab analysis, and report-rendering model for New Hampshire. Verify the current interpretation with the responsible state authority or qualified counsel.

Professional context

Relevant certifications

Voluntary or state-recognized credentials associated with mold work in New Hampshire.

  • ACAC CMI
  • ACAC CIE
  • ACAC CMR
  • IICRC AMRT

Before accepting work

Additional notes

  • 01NH is unusual: residential mold assessment is licensed, but mold remediation is unregulated at the state level.
  • 02HB1126 (a 2026 bill to repeal mold certification requirements) was killed by the NH Senate in March 2026 — existing requirements remain in force.

After you verify the rule

Keep the requirements visible as the job moves.

Mold Inspector can organize scheduling, field documentation, reports, quotes, and invoices. It does not replace required training, licensing, sampling protocols, legal review, or professional judgment.

See the workflow

Always verify directly with New Hampshire. Requirements may have changed since 2026-06. Confirm the current rule with the responsible regulatory body before beginning mold-related work. This page is a research starting point, not legal advice.