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PermitRoadmap

Do I need a permit for addition or structural alteration in Unincorporated Baltimore County?

Permit required

Yes. In Maryland, addition or structural alteration generally requires a permit, and Unincorporated Baltimore County is no exception.

State law requires every county, Baltimore City, and municipality that enforces the Standards to review plans, issue building permits, inspect permitted work, and issue use and occupancy certificates (Public Safety 12-505). Maryland has no statewide dollar-value or size exemption from building permits; do not read the MHIC contractor-licensing rules as a permit exemption. Land within 1,000 feet of tidal waters or tidal wetlands is generally in the Chesapeake Bay or Atlantic Coastal Bays Critical Area, where State law caps lot coverage (often 15 percent, or 25 percent on some older small lots) and a separate local critical area review may apply. Work on existing buildings may also be reviewed under the Maryland Building Rehabilitation Code (COMAR 09.12.58).

Get the checklist for your addition or structural alteration in Unincorporated Baltimore County. A free check first, then a free printable Permit Prep Pack.

Documents you may need

  • Permit application to the county, Baltimore City, or municipal permit officerequired
  • Property address and parcel (tax account) informationrequired
  • Construction drawings for the addition or alterationrequired
  • Site plan with setbacks and lot coveragerequired
  • Maryland Home Improvement Commission (MHIC) license number of the contractor, if one is hiredLikely required
  • Energy code compliance documentation (2021 IECC as adopted)Likely required
  • Separate electrical, plumbing, and mechanical permits by licensed tradesLikely required

Possible inspections

  • Footing and foundation
  • Framing
  • Electrical, plumbing, and mechanical rough-ins
  • Insulation and energy
  • Final inspection and use and occupancy approval where issued

Frequently asked questions

Do I need a permit for addition or structural alteration in Unincorporated Baltimore County?
Yes. In Maryland, addition or structural alteration generally requires a permit, and Unincorporated Baltimore County is no exception. The documents and inspections sections on this page list what the building department typically asks for.
Who issues the permit in Unincorporated Baltimore County?
The local building department for Unincorporated Baltimore 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.