Do you need an HVAC permit in Maryland?
By Mario Bailey Last checked
- Always required
- 1
- of 4 jurisdictions
- Conditional
- 3
- depends on size or scope
- Not required
- 0
- exempt outright
HVAC Permit rules nationwide, beyond Maryland.
Requirements and size thresholds for HVAC permits vary by locality. The table below compares what each Maryland county or city requires. Always confirm with the local office before starting.
Comparing states? See HVAC permit rules across every locality we cover.
What to know about HVAC permits in Maryland
HVAC permits in Virginia typically apply to new installations and to replacing gas or oil fueled equipment. Costs vary with equipment type and your locality. Using a licensed mechanical contractor matters, because the install must meet code and pass inspection, which also helps protect your equipment warranty.
The application steps and inspection sequence for HVAC permits come from the model code rather than from Maryland law, so they read the same wherever you build. We keep that walkthrough in one place: how an HVAC permit application and its inspections work, start to finish. What changes between Maryland jurisdictions is below: who requires a permit, what they charge, and which office you file with.
Swipe sideways to see thresholds and confidence.
| Locality | Permit required? | Typical threshold | Confidence |
|---|---|---|---|
| Baltimore County | Conditional | Not specified | Confirmed on official page |
| Howard County | Conditional | Not specified | Confirmed on official page |
| Montgomery County | Yes | Not specified | Confirmed on official page |
| Prince George's County | Conditional | Not specified | Confirmed on official page |
| No localities match your filter. | |||
What an HVAC permit costs in Maryland
4 Maryland jurisdictions we cover publish a fee figure for this work. Each line is quoted from that office's own schedule and linked to its citation. The figures are not comparable to one another: some are flat minimums, some a percentage of job value, some charged per fixture, so what you pay depends on which schedule applies and on your job's valuation.
The Building Permit Fee Schedule effective 07/01/26 prices Mechanical, HVAC System Only for commercial work only ($100.00 under 4,000 sf, $250.00 all others) and publishes no residential mechanical line item. The trade permits that a residential HVAC job usually needs are priced separately: Electrical Permit Fee Schedule effective 11/26/18, Equipment Only (new or replacement), each piece of equipment $34.00; Plumbing Inspection Fee Schedule effective 11/26/18, Gas Permits, 1st Appliance $30.00 plus $14.00 each additional.
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$50 non-refundable application fee; $40 per heating/cooling zone for a single-family attached or detached dwelling; FY2027 HVAC Permit Fee Schedule
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Mechanical Permit minimum fee $80.84 for a residential one or two family dwelling, charged in addition to per-unit equipment fees such as $28.61 per 100 MBH of heating or per five-ton cooling capacity, per DPS-Fees-Electrical-Mechanical-FY27.pdf effective 2026-07-01
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DPIE Fee Schedule, effective March 2, 2025, line item "Mechanical Permit - Commercial/Residential", minimum permit fee $86: "Total Fee = Administrative Fee $66 + Mechanical Fee ($86 or 1.3% of Mechanical Construction Cost, whichever is greater). Plus Technology Fee 10%." The companion electrical permits are priced separately at "Electrical Permit Fee - Heating Equipment Unit" $50 and "Electrical Permit Fee - A/C Equipment Unit" $50, each plus the $66 administrative fee and the 10% technology fee.
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Jurisdictions not listed publish no dollar figure we could quote. Absence does not mean a permit is free.
Common questions about HVAC permits in Maryland
- Do I need an HVAC permit in Maryland?
- In Maryland it depends on the size of the job. Permits are issued locally, so the answer comes from your Maryland city or county rather than a single statewide rule. Of the 4 Maryland jurisdictions we have verified for HVAC work, 1 requires a permit outright, 3 depend on the size or scope of the job, and 0 require none.
- Is there an HVAC permit exemption in Maryland?
- 3 of the 4 Maryland jurisdictions we cover set a threshold rather than a flat rule, so the same job can be exempt in one Maryland county and permitted in the next. The table above lists each Maryland jurisdiction's published threshold in its own words, with the source and the date we verified it.
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