Plumbing Permit in Montgomery County, Maryland

Permit required?

Yes, a permit is required.

When a permit is usually needed

For new plumbing installations fixture changes or system modifications

Permit cost and what affects it

Fees are set by the locality and are not published here. See the official fee schedule or contact the office for current amounts.

Permit costs generally depend on the project valuation, the scope of work, and the inspections required. Ask the office how the fee is calculated for your specific project.

Where to apply

• Official permit page
• Permit portal

Frequently asked questions

Do you need a plumbing permit in Montgomery County?

Plumbing permits in Montgomery County are handled by the Washington Suburban Sanitary Commission (WSSC) rather than the county DPS for work involving the water and sewer system. A mechanical inspection by DPS is also required when a gas furnace is installed or replaced. Contact WSSC Water (301-206-8000) and DPS at 240-777-0311 to confirm requirements for your project. Always confirm with the Montgomery County Department of Permitting Services before starting.

How much does a plumbing permit cost in Montgomery County?

Fees are set by Montgomery County and are not published here. Contact the office for current amounts.

How long does a plumbing permit take in Montgomery County?

Processing time for a plumbing permit in Montgomery County varies by workload and project scope. Contact the Montgomery County Department of Permitting Services for a current estimate.

Where do you apply for a plumbing permit in Montgomery County?

You can apply through the Montgomery County permit portal or contact the Montgomery County Department of Permitting Services directly. The links are listed on this page.

Official sources

• https://www.montgomerycountymd.gov/DPS/divisions/residential/index.html
• https://www.montgomerycountymd.gov/department-permitting-services/all-permits/electrical-mechanical-permits/residential-mechanical-permit-process