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Additions

Additions

BUILDING PERMITS

Building an addition in Fairfax County requires the following permits.

  • Building Permit.
  • Electrical Permit.
  • Mechanical Permit if installing heating and air conditioning systems.
  • Plumbing Permit if installing plumbing fixtures or gas piping.

To apply for a permit, go to the Permit Application Center at the Herrity Building in Fairfax. To learn more about the permit application process, please refer to our Additions (PDF) publication.

BUILDING PLANS

You must submit the following during the permit application process.

Building plans must meet the current building code and local design criteria like snow load and wind speed. For a full list of plan requirements, please refer to our Additions (PDF) publication.

CONTACT US

For a list of frequently asked questions, please refer to our FAQs page, e-mail us or call 703-222-0801, TTY 711 during our hours of operation. The permit, plan review and inspection processes can also be accessed through the Fairfax Inspections Database Online (FIDO).