Do I need a permit for shed or accessory structure in Fairfax County?
It depends. Whether shed or accessory structure needs a permit in Fairfax County comes down to the details of your project.
Under the Virginia USBC (13VAC5-63-80, Section 108.2), a one-story detached accessory structure used as a tool or storage shed or playhouse is exempt from a building permit if it is 256 square feet or less (detached utility buildings are exempt at 150 square feet or less). The exemption is lost once the structure exceeds those limits, contains habitable or conditioned space, or is in a flood hazard area. Any electrical, plumbing, or mechanical work run to the shed requires its own permit even when the structure itself is exempt, and local zoning setback rules still apply.
Documents you may need
- Permit applicationSometimes required
- Site plan showing setbacks and property linesLikely required
- Foundation / anchoring detail (for larger structures)Sometimes required
Possible inspections
- Footing / foundation or anchoring inspection where a permit applies
- Final inspection where a permit is issued
Frequently asked questions
- Do I need a permit for shed or accessory structure in Fairfax County?
- It depends. Whether shed or accessory structure needs a permit in Fairfax County comes down to the details of your project. Under the Virginia USBC (13VAC5-63-80, Section 108.2), a one-story detached accessory structure used as a tool or storage shed or playhouse is exempt from a building permit if it is 256 square feet or less (detached utility buildings are exempt at 150 square feet or less). The exemption is lost once the structure exceeds those limits, contains habitable or conditioned space, or is in a flood hazard area. Any electrical, plumbing, or mechanical work run to the shed requires its own permit even when the structure itself is exempt, and local zoning setback rules still apply.
- Who issues the permit in Fairfax County?
- The local building department for Fairfax 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.