HVAC / Furnace Permit Requirements in Baltimore, MD
Independent city. Uses Maryland Building Performance Standards (2018 IRC). Licensed trades required. Historic districts with additional review.
When you DO need a permit
Replacing an HVAC system (even same-for-same) requires a mechanical permit.
Estimated fee: $75 – $250
Typical timeline: About 1 week
Source: Maryland Building Performance Standards (2018 IRC)
Installing a new HVAC system requires mechanical and electrical permits.
Estimated fee: $150 – $500
Typical timeline: About 2 weeks
Source: Maryland Building Performance Standards (2018 IRC)
Modifying or installing ductwork requires a mechanical permit.
Estimated fee: $75 – $250
Typical timeline: About 1 week
Source: Maryland Building Performance Standards (2018 IRC)
Installing a mini-split system requires mechanical and electrical permits.
Estimated fee: $75 – $250
Typical timeline: About 1 week
Source: Maryland Building Performance Standards (2018 IRC)
Replacing an HVAC system (even same-for-same) requires a mechanical permit.
Estimated fee: $75 – $250
Typical timeline: About 1 week
Source: Maryland Building Performance Standards (2018 IRC)
Installing a new HVAC system requires mechanical and electrical permits.
Estimated fee: $150 – $500
Typical timeline: About 2 weeks
Source: Maryland Building Performance Standards (2018 IRC)
Installing a mini-split system requires mechanical and electrical permits.
Estimated fee: $75 – $250
Typical timeline: About 1 week
Source: Maryland Building Performance Standards (2018 IRC)
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Frequently Asked Questions
Estimated permit fees for HVAC / Furnace projects in Baltimore, MD range from $75 – $250. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller HVAC / Furnace projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Baltimore can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for HVAC / Furnace permits in Baltimore is About 1 week. More complex projects may take longer if plan review is required.
Learn More About HVAC / Furnace Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read HVAC / Furnace Guide →