Do I need a water heater 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 2 Maryland jurisdictions we have verified for water heater work, 0 require a permit outright, 2 depend on the size or scope of the job, and 0 require none.

Is there a water heater permit exemption in Maryland?

2 of the 2 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.

Maryland

Do you need a water heater permit in Maryland?

By Mario Bailey Last checked 12 Jul 2026

Always required: 0; of 2 jurisdictions
Conditional: 2; depends on size or scope
Not required: 0; exempt outright

Water Heater Permit rules nationwide, beyond Maryland.

Requirements and size thresholds for water heater 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 water heater permit rules across every locality we cover.

The application steps and inspection sequence for water heater 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 a water heater 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
Howard County	Conditional	Not specified	Based on building code
Montgomery County	Conditional	Not specified	Based on building code
No localities match your filter.

Common questions about water heater permits in Maryland

Do I need a water heater 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 2 Maryland jurisdictions we have verified for water heater work, 0 require a permit outright, 2 depend on the size or scope of the job, and 0 require none.
Is there a water heater permit exemption in Maryland?: 2 of the 2 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.

Do you need a water heater permit in Maryland?

Common questions about water heater permits in Maryland

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