Maryland: HVAC contractor licensing, reciprocity and contract rules.

This page lists what Maryland publishes about licensing an HVAC or mechanical contractor and contracting with homeowners: who issues the licence, whether one is required statewide, the classes and qualifications, insurance or bond minimums, reciprocity with other states, renewal and continuing education, and the state's home-improvement contract statute if it has one.

It is built for owners of residential HVAC companies, especially those hiring across a state line or opening a second territory. Every entry is a snapshot of what the cited source published on the verification date; it is a research starting point, not legal advice.

Maryland, field by field.

Contractor licensing authority

Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration Contractors (Board of HVACR Contractors), Maryland Department of Labor; the Board “licenses and regulates individuals who provide commercial and residential HVACR services” under Business Regulation Article, Title 9A, Annotated Code of Maryland, and COMAR 09.15 (Board index and law pages).

HVAC licence required

Statewide — Md. Code, Bus. Reg. §9A-301: “Except as otherwise provided in this title, an individual shall be licensed by the Board before the individual provides or assists in providing heating, ventilation, air-conditioning, or refrigeration services in the State”; no dollar threshold. Licence classes: “Apprentice, Journey, Journey Restricted, Limited Contractor, Master Restricted, or Master Contractor” (Board unlicensed-work page; §9A-302). Unlicensed work: “a criminal sentence may be imposed up to 6 months for a first violation” and “an administrative monetary penalty of up to $5,000 per violation”, plus licence suspension or revocation (Board page). “Anne Arundel and Prince George's Counties also require individuals to hold a county HVACR license as well as a Maryland HVACR license in order to perform HVACR services in those counties”; in other counties and cities “local plumbing, gasfitting and electrical permits may be required before HVACR work can begin” (Board county page). Since October 1, 2025 (2025 Md. Laws ch. 386, HB 1162), Bus. Reg. §9A-501.1 provides that a person “may not knowingly sell or offer to sell” HVACR equipment to a person unless that person holds, or employs a holder of, a master, master restricted or limited licence, resells the equipment to Board licensees, or is not required to be licensed under §9A-103 (sellers of other construction materials deriving less than 25% of revenue from HVACR equipment are exempt), and a seller must “at the time of sale, provide a written notice to the individual purchasing the equipment” about the licence requirement; the Board was to adopt implementing regulations “On or before January 1, 2026” (§9A-501.1(c)).

Licence classes & qualifications

Master HVACR contractor: at least 3 years of active experience, “regularly and principally employed” in all areas of HVACR services under a journeyman, journeyman restricted, limited or master restricted licence and under a master contractor's direction and control, with at least 1,875 hours in the year before applying, and a Board examination (§9A-302(b); Board requirements page: passing score 70%). Master restricted: 3 years and 1,875 hours in refrigeration, air-conditioning, forced-air heating, hydronic heating or ventilation services under a master or master restricted contractor, plus examination (§9A-302(c)). Limited contractor: 2 years of active experience under a journeyman licence working for a master, master restricted or limited licensee, with 1,000 hours in the prior year, plus examination (§9A-302(d)). Journeyman: held an apprentice licence for at least 4 years with at least 6,000 hours of training under a licensed contractor, plus examination (§9A-302(e)). Journeyman restricted: apprentice licence for at least 3 years with at least 1,875 hours of training in the restricted services, plus examination (§9A-302(f)). Applicants submit an application and pay an examination fee “not to exceed the cost of the examination” (§9A-303). Licence fees as of July 1, 2025 (Board fee page): apprentice $12; journeyman $25; journeyman restricted $25 for each area licensed; limited $94.50; master restricted $31.50 for each area licensed; master $94.50.

Insurance / bond minimum

Bus. Reg. §9A-402(a): a master, master restricted or limited licensee may not contract to provide HVACR services unless the work, including completed operations, is covered by “general liability insurance in the amount of at least $300,000” and “property damage insurance in the amount of at least $100,000”; the licensee or the employing business may carry the policy (§9A-402(b)); licensed apprentices, journeymen and restricted journeymen working under a licensee's control and supervision need no separate coverage, nor do Board-approved inactive licensees (§9A-402(c)); proof of insurance is required with the application and at each renewal and the Board may not issue or renew a licence without it (§9A-402(d)–(e); §9A-308(a); §9A-309(b)); the licensee must give the Board at least 10 days' notice before a cancellation takes effect (§9A-402(f)); proof of this insurance may be submitted in place of a surety bond required by a county or other political subdivision (§9A-402(g)). No state bond requirement.

Reciprocity

Board licensing FAQ: “The Board currently has reciprocal agreements with Delaware and Virginia.” Bus. Reg. §9A-305 lets the Board, by majority vote of its authorized membership, waive the examination for an applicant who pays the fee, holds an active licence in good standing in another state that is equivalent to the Maryland licence and was obtained on at least equivalent requirements including comparable work experience, and “only if the state in which the applicant is licensed waives the examination” of Maryland licensees “to a similar extent” (§9A-305(c)). “A license is required even if the contractor does not have an office in Maryland” (Board FAQ).

Renewal & continuing education

Two-year term: Bus. Reg. §9A-309(a)–(b): a licence expires on the first October 1 in an odd-numbered year after its effective date unless renewed for an additional 2-year term on payment of the renewal fee and submission of a renewal application with “proof of insurance as provided by § 9A-402 of this title”; inactive status may be elected at renewal (§9A-309(d)); a licence expired less than 4 years may be restored on payment of the renewal or reinstatement fee, after which the Board may require a new initial application (§9A-309(e)). Continuing education: the Board's education page states the Board “does not require continuing education credits.”

Home-improvement contract rule

Maryland Home Improvement Law, Bus. Reg. Title 8 (Maryland Home Improvement Commission, MHIC). §8-301 requires a contractor or salesperson licence for home improvement, but §8-301(c)(4) exempts “an architect, electrician, plumber, heating, ventilation, air–conditioning, or refrigeration contractor, or other person” who “is required by State or local law to meet standards of competency or experience”, currently holds that State or local licence, and either acts only within that occupation or installs a central heating or air-conditioning system; §8-301(c)(7) exempts a person selling a home improvement to be performed by such a person. Contract rules: §8-501(b) — the contract must “be in writing and legible”, describe each incorporated document and be signed by each party; §8-501(c)(1) — “the name, address, telephone number, and license number of the contractor”, each salesperson's name and licence number, approximate start and completion dates, description of work and materials, agreed price and payment terms, and the Commission's notices (telephone and website; consumer protections and the option of a performance bond); §8-501(c)(2)–(3) — when payment is secured by residential real estate, a first-page notice in at least 10-point bold type that the contract “creates a mortgage or lien against your property to secure payment” and may be rescinded “within 3 business days after the date you sign it”, separately initialled by the owner; §8-501(d) — a copy signed by the contractor to the owner before work begins; §8-617: “A person may not demand or receive any payment for a home improvement before the home improvement contract is signed” and “A person may not receive a deposit of more than one-third of the home improvement contract price” before or at execution (MHIC regulations authorize civil citations of $500 to $5,000 for contract violations, per the MHIC contractors notice). Door-to-door sales (Com. Law Title 14, Subtitle 3, the Maryland Door-to-Door Sales Act, §14-306): for sales of $25 or more solicited away from the seller's place of business (§14-301(d)), §14-302 requires the general cancellation statement “You, the buyer, may cancel this transaction at any time prior to midnight of the third business day after the date of this transaction” and a detachable “Notice of Cancellation”; but §14-302.1 (added by 2016 Md. Laws ch. 485, effective June 1, 2016) provides that “Notwithstanding § 14–302 of this subtitle, for a home improvement contract” the statement and the Notice of Cancellation must allow cancellation “prior to midnight of the fifth business day after the date of the transaction, or midnight of the 7th business day after the date of the transaction if the buyer is at least 65 years old”, and the seller must obtain the buyer's signature on a written acknowledgment of the right to cancel (with a box to check if the buyer is at least 65) and furnish a copy of it, failure being an unfair or deceptive trade practice. The MHIC contracts and door-to-door pages state the same fifth-business-day/seventh-day rule, add that the seller must return the deposit within 10 business days of receiving the cancellation, and note that the Act does not apply to a transaction resulting from a written change order to a previously signed contract. Under §14-303 the buyer may cancel “in any manner and by any means” if the seller violates §14-302; §14-304 makes a violator liable for damages and reasonable attorney fees.