What's Required in Baltimore
- Mechanical permit required for HVAC system changes or replacements.
- Requires contractor information for a licensed HVAC technician.
- Site plan may be required for exterior unit placement.
- Electrical permit required for power connection to the system.
- Must include description of proposed mechanical work.
- Compliance with 2021 IECC Energy Efficiency standards.
Do You Need a Permit to Replace an AC or Furnace in Baltimore?
Yes. Baltimore treats HVAC replacement as permit-required work, and that includes the common case people hope is exempt: a like-for-like swap of a furnace, AC condenser, or heat pump in the same location. Permit fees typically run $50–$1,500, and the permit is issued by the Department of Permits, Approvals and Inspections. In practice your HVAC contractor pulls it as part of the job — if a bid doesn't mention the permit, ask why, because unpermitted mechanical work surfaces at home sale time and in insurance claims.
HVAC Repairs vs. Replacement: Where the Permit Line Falls
The line falls at equipment, not maintenance. Repairs that keep an existing system running — a blower motor, capacitor, control board, or a thermostat swap on existing wiring — generally don't need a permit. Replacing the equipment itself, adding or reworking ductwork, or running new gas or electrical almost always does. Refrigerant-line and coil replacements sit in the gray zone and vary by city. When the scope is unclear, describe the exact job to the Department of Permits, Approvals and Inspections before work starts; it's a five-minute call.
How to Get a HVAC Permit in Baltimore
Step 1: Hire Technician
Select a licensed HVAC contractor registered with PAI.
Step 2: Submit Application
Contractor enters work details and project info in the portal.
Step 3: Document Upload
Upload system specs and necessary site plans.
Step 4: Fee Notification
Applicants receive notice when fees are ready for payment.
Step 5: Inspection
Schedule technical review inspections upon project completion.