Skip to content
PermitRoadmap

Do I need a permit for water heater replacement in Unincorporated Montgomery County?

Permit likely required

Most likely yes. Water heater replacement usually requires a permit in Maryland. Confirm the specifics with Unincorporated Montgomery County.

A gas fired water heater, a change in size, or a move to a new location falls outside like for like exemptions, which cover a same size electric unit reinstalled in the same place. Gas work normally needs its own mechanical or gas permit and a pressure test, and relocating the unit can change venting, combustion air, drain pan, and expansion tank requirements. The State Plumbing Code adopts the International Plumbing Code, the IRC plumbing chapters, the International Fuel Gas Code, NFPA 54, and NFPA 58 (COMAR 09.20.01.01). An individual may do plumbing in the individual's own residence without a State plumbing license, but not the final connection to a public or private water or sewer system (Business Occupations and Professions 12-301(b)); local permit rules still apply. Baltimore County and the WSSC areas of Montgomery and Prince George's counties are outside most of the State plumbing law and set their own plumbing rules (Business Occupations and Professions 12-103).

Get the checklist for your water heater replacement in Unincorporated Montgomery County. A free check first, then a free printable Permit Prep Pack.

Documents you may need

  • Plumbing permit applicationLikely required
  • Property address and parcel (tax account) informationrequired
  • Water heater specificationsLikely required
  • Plumber or gas fitter license numberLikely required
  • Gas or electrical permit where the fuel connection changesSometimes required

Possible inspections

  • Plumbing inspection including relief valve and venting
  • Gas piping inspection where applicable
  • Electrical inspection where a new circuit is added

Frequently asked questions

Do I need a permit for water heater replacement in Unincorporated Montgomery County?
Most likely yes. Water heater replacement usually requires a permit in Maryland. Confirm the specifics with Unincorporated Montgomery County. The documents and inspections sections on this page list what the building department typically asks for.
Who issues the permit in Unincorporated Montgomery County?
The local building department for Unincorporated Montgomery County handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
How do I find out the exact requirements for my project?
Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.

PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.