How to Start an HVAC Business in Maryland: HVACR Master License

If you want to run your own heating, ventilation, air conditioning, and refrigeration business in Maryland, the license you need is the HVACR master license from the Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors (the Board of HVACR). This guide covers the Maryland HVAC license requirements, the master exam, the fees the Board publishes, and the business formation steps that come after the license. It is written for journeymen who are ready to step up and for owners who want the full sequence in one place.

Disclaimer: This article is informational content, not legal or tax advice. Licensing rules, fees, and filing deadlines change, so confirm every figure with the agency named before you pay or file. For complex situations, such as buying into an existing contractor, adding partners, or working across state lines, consult a qualified Maryland attorney and a CPA.

What You Need Before You Start

Gather these items before you begin. Several of them take weeks to collect, especially the work records.

• Proof of your current Maryland journeyman license, or a higher HVACR license issued under the Board
• Employment records showing three years as a licensed journeyman and at least 1,875 hours worked in the year before you apply, such as pay stubs, W-2 forms, and signed letters from employers that list dates and hours
• The Board's current application and exam information, which you can request directly from the Board
• The master license fee of $94.50, using the fee schedule effective July 1, 2025
• A certificate of insurance showing at least $300,000 general liability and $100,000 property damage, if you will contract work
• A Maryland resident agent who is a Maryland citizen over eighteen, a Maryland corporation, or a Maryland LLC, with a Maryland street address (no P.O. box)
• A business name that follows SDAT naming rules, plus $100 for the LLC filing fee if you form an LLC
• A federal Employer Identification Number (EIN) from the IRS, which is free to obtain

Step-by-Step: From Journeyman to Master Contractor in Maryland

Step 1: Confirm that you need a Board license

Anyone offering HVACR services in Maryland needs a Board of HVACR license, even if you already hold a license in another state. An out-of-state credential does not let you bid or perform Maryland work on its own. Your first decision is which license tier you are targeting, because the master license is the one that lets you run a contracting business. Reciprocity is limited, so read Step 3 before you assume an exam waiver applies to you.

Step 2: Document three years as a licensed journeyman

The master license requires a journeyman license or higher, three years working as a licensed journeyman, and at least 1,875 hours worked in the year before you apply. Start a simple log now. Record the employer, job type, dates, and hours each month, and keep the supporting pay records. Hours are measured in the year before you apply, so you want clean, provable numbers for that final year.

If you have gaps in your employment history, check how they affect your three-year count before you schedule the exam. Ask the Board to confirm your eligibility in writing if your history is unusual.

Step 3: Check whether reciprocity applies

Maryland offers reciprocity with Delaware and Virginia only. If you hold a license in one of those states and meet the other minimum requirements, the master exam can be waived. If you are licensed in any other state, you will need to take the Maryland exam. Request the reciprocity paperwork from the Board, because the Board decides eligibility and this guide cannot make that determination for you.

Step 4: Prepare for and pass the master exam

The master exam requires a score of 70% to pass. Study the Maryland code and regulations that govern HVACR work, not only general trade manuals, because the exam tests Maryland rules. Ask the Board which reference materials it recommends, what the exam format looks like, and how far in advance you must register. If you do not pass, plan a second attempt rather than treating one failure as the end of the process.

Step 5: Submit your application and pay the Board fee

Under the fee schedule effective July 1, 2025, the master license fee is $94.50. For comparison, the limited license is also $94.50, the journeyman license is $25, and the apprentice license is $12. Master restricted and journeyman restricted fees depend on the areas you are licensed to work in, so confirm those amounts for your situation. Renewal fees are not listed on the fee page, so ask the Board for the renewal schedule before you budget for the license year.

Submit a complete application. An incomplete packet delays your review, and missing hours documentation is one of the most common reasons applications stall.

Step 6: Put your insurance certificate in place

Master contractors who contract work must give the Board a certificate of insurance showing $300,000 general liability and $100,000 property damage. Ask your insurance broker to issue the certificate in the form the Board accepts, and confirm the format with the Board before you submit. Keep the policy active without a gap, because a lapse can put your license at risk.

Insurance cost depends on your payroll, subcontractor use, and claims history, so get quotes before you commit to a start date. If you plan to hire employees, also ask your broker and the Maryland Department of Labor about workers' compensation coverage requirements for employers.

Step 7: Check county registration before you work outside your home base

Harford County registration of HVACR contractors under a state agreement has not been verified for this guide. Do not assume that a Board license is enough for Harford County work, and do not assume that a separate county registration is required. Confirm the rule directly with Harford County before you bid or perform work there.

Step 8: Form your business entity

Most owners form a limited liability company (LLC) or a corporation. Both are filed with the Maryland State Department of Assessments and Taxation (SDAT), Charter Division, through Maryland Business Express.

• LLC: The filing fee is $100 for Articles of Organization. The name must include Limited Liability Company, L.L.C., LLC, L.C., or L C, and it must not be misleadingly similar to another LLC, corporation, trade name, limited partnership, or limited liability partnership on file with SDAT. The resident agent must sign the Articles, and you must have the agent's consent before filing.
• Corporation: The filing fee is $120 for Articles of Incorporation.

Search for your proposed name first at the Maryland business entity search. If you need time to finalize your paperwork, a name reservation costs $25 and holds the name for 30 days. File your formation documents through Maryland Business Express.

Processing time depends on the speed option you choose. Non-expedited filings are reviewed during the second calendar month after submission, and paper filings take about 8 weeks. Expedited review adds $50 and takes 7 to 14 business days. Online rush service adds $325 and is reviewed within 3 hours when submitted by 2:30 p.m. on a business day. Same-day paper drop box service adds $425. Confirm current options on the SDAT and Maryland Business Express pages before you file.

Step 9: Register a trade name if you will operate under another name

If your business will operate under a name other than the legal name of your LLC or corporation, file a Trade Name Registration with SDAT. Do not file it with the county. The standard fee is $25, or $75 total with the $50 expedited fee. The form is available at the SDAT trade name application.

Step 10: Set up your tax registrations

Tax treatment depends on your entity type, so review this step with a CPA before you commit to a structure.

• Sales tax: Maryland's state sales tax rate is 6%. If you sell taxable equipment, parts, or other goods, register for a free Sales and Use Tax License through the Combined Registration Application at the Maryland business taxes and insurance page. Ask the Comptroller of Maryland at marylandcomptroller.gov whether your mix of service and equipment sales is taxable.
• Trader's license: Most businesses that sell goods need a trader's license from the Clerk of the Circuit Court in their county. The license year runs May 1 through April 30. The Clerk requires the Sales and Use Tax License first, and will not issue a trader's license if you owe personal property tax or have missing SDAT filings. Whether a service-focused HVAC contractor needs one depends on what you sell, so confirm with your county Clerk.
• Income tax: An LLC is a pass-through entity for Maryland income tax, so members report income on personal returns. Maryland's personal income tax rate is graduated from 2% to 6.5%, plus a county or Baltimore City local rate of 2.25% to 3.30% for 2026. A corporation pays a flat 8.25% on Maryland taxable income.

Step 11: Calendar your annual report and personal property filing

LLCs and corporations both owe the Annual Report and Business Personal Property Return (Form 1) each year. The fee is $300, and the report is due April 15. If you need more time, file an extension request at pprextensions.dat.maryland.gov. Add the due date to your calendar the day you form the entity. County business personal property tax may also apply if you report taxable business personal property.

Fees at a Glance

Item	Amount	Agency or source
Master HVACR license	$94.50	Board of HVACR, fee schedule effective July 1, 2025
Limited HVACR license	$94.50	Board of HVACR, fee schedule effective July 1, 2025
Journeyman HVACR license	$25	Board of HVACR, fee schedule effective July 1, 2025
Apprentice HVACR license	$12	Board of HVACR, fee schedule effective July 1, 2025
Master restricted and journeyman restricted licenses	Varies by area licensed	Confirm with the Board of HVACR
Renewal fees	Not listed on the fee page	Confirm with the Board of HVACR
LLC Articles of Organization	$100	SDAT, Charter Division
Corporation Articles of Incorporation	$120	SDAT, Charter Division
Name reservation (30 days)	$25	SDAT
Trade Name Registration	$25 standard, or $75 with $50 expedited	SDAT
Annual Report and Business Personal Property Return	$300, due April 15	SDAT

What Results to Expect

Once you hold a master license and a properly formed entity, you may be able to bid on master-level work and sign contracts under your business name. Many new owners find that their first several months go to paperwork, insurance, and records, and that work volume depends on local demand, your experience, your pricing, and how you find customers. This guide cannot promise a specific timeline, approval date, or income level. The Board's processing time is not published here, so ask the Board for its current estimate when you submit your application.

Common Mistakes to Avoid

• Applying before you meet the hours rule. The 1,875 hours must be worked in the year before you apply. Applying early with a short count wastes the application fee and time.
• Assuming an out-of-state license covers Maryland work. Anyone offering HVACR services in Maryland needs a Board license, and reciprocity applies only to Delaware and Virginia.
• Counting on an exam waiver without checking. The waiver requires a license in Delaware or Virginia plus the other minimum requirements. Confirm before you skip the exam.
• Letting the insurance certificate lapse. The $300,000 general liability and $100,000 property damage minimums apply to master contractors who contract work.
• Filing the trade name with the county. Trade Name Registration goes to SDAT.
• Choosing a name that looks like an existing entity. SDAT can reject a name that is misleadingly similar to one already on file. Search first and reserve the name if you need time.
• Missing the 2:30 p.m. cutoff. Online rush filings must be submitted by 2:30 p.m. on a business day to receive the 3-hour review.
• Forgetting the April 15 annual report. The $300 report is due every year, and late filings can complicate other paperwork.
• Assuming county rules match state rules. Harford County registration is unverified, and county trader's license rules apply separately.

Tips for a Smoother Launch

• Start your hours log today. It costs nothing and is the easiest thing to rebuild later from memory.
• Ask the Board to confirm every requirement in writing, including the certificate of insurance format and renewal fees.
• Book your exam only after you have reviewed the study materials the Board recommends and set a realistic study schedule.
• Use the Maryland Small Business Development Center (SBDC) Network at marylandsbdc.org to review your business plan, pricing, and financial projections before you commit to a lease or equipment purchase.
• Set up a separate business bank account after your entity is approved, and keep licensing, insurance, and tax records in one folder.

When to Bring in Professionals

Hire a Maryland attorney if you plan to add partners, buy an existing HVAC company, or sign contracts with large commercial customers. Talk to a CPA before you choose between an LLC and a corporation, because the tax treatment differs and the choice affects your personal returns. Work with an insurance broker to match your coverage to the jobs you plan to take.

Remember that this article is informational content, not legal or tax advice. Verify each fee, deadline, and requirement with the agency that administers it before you act on it.