Do you need an HVAC permit in Maryland?
By Mario Bailey Last checked
Of the 5 Maryland counties and cities we checked, 1 requires an HVAC permit for every job and 4 require an HVAC permit only past a size or scope limit.
- Always required
- 1
- of 5 jurisdictions
- Conditional
- 4
- 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.
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 |
|---|---|---|---|
| Anne Arundel County | Conditional | Before installing or replacing a furnace, heat pump, central air conditioner or ductwork | Confirmed on official page |
| Baltimore County | Conditional | Before installing ductwork in a dwelling that has none or adding ductwork not covered by... | Confirmed on official page |
| Howard County | Conditional | For new HVAC installations, fuel or energy source conversions, additions or alterations... | Confirmed on official page |
| Montgomery County | Yes | Any size | Confirmed on official page |
| Prince George's County | Conditional | Before installing or replacing a furnace, boiler, heat pump, central air conditioner... | Confirmed on official page |
| No localities match your filter. | |||
What an HVAC permit costs in Maryland
5 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.
Mechanical, residential: "Heating and Air Conditioning | $121.00", "Heating System | $95.00", "Air Conditioning | $95.00", "Ductwork Only | $95.00", "Replacement System | $51.00", plus a $43.00 non-refundable application fee; minimum mechanical fee $51.00 (effective October 1, 2024). Gas appliances also need a gas permit (minimum $69.00).
last checked
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.
last checked
$50 non-refundable application fee; $40 per heating/cooling zone for a single-family attached or detached dwelling; FY2027 HVAC Permit Fee Schedule
last checked
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
last checked
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.
last checked
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 5 Maryland jurisdictions we have verified for HVAC work, 1 requires a permit outright, 4 depend on the size or scope of the job, and 0 require none.
- Is there an HVAC permit exemption in Maryland?
- 4 of the 5 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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