Do you need a permit for a deck in Fairfax County, VA?
Yes. Virginia's building code has no deck exemption, and Fairfax lists decks among projects that need permits.
Every deck needs a building permit in Fairfax County.
Decks may extend into setbacks only as far as Table 5100.1 allows, depending on height.
Rules last checked by a person on October 20, 2026. Guidance only; confirm with Fairfax County before you build.
Check your exact lot
Setbacks depend on your zoning district, and a flood zone can change the permit answer. Enter your address to see both.
Permits a deck can need in Fairfax County
| Permit | When it applies |
|---|---|
| Building permit | Virginia's building code has no deck exemption, and Fairfax lists decks among projects that need permits. |
| Floodplain development permit | In a FEMA special flood hazard area, all development needs a permit. |
Local details
- Deck encroachments into setbacks depend on the deck's height (Zoning Ordinance Table 5100.1). A roofed deck or porch in a setback usually needs a BZA special permit.
- Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
- HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.
- Lots along streams may fall in a Chesapeake Bay Resource Protection Area. Any shed, deck or addition in an RPA needs Bay Act review before a permit can issue.
How to apply
Questions people ask
- When does a deck need a building permit in Fairfax County?
- Virginia's building code has no deck exemption, and Fairfax lists decks among projects that need permits.
- Where do I apply for a deck permit in Fairfax County?
- Apply through PLUS permitting portal, or call 703-222-0801.
Sources
- Virginia USBC, 13VAC5-63-80 Section 108.2, Exemptions from application for permit. Checked 2026-10-20.
2. One story detached structures used as tool and storage sheds, playhouses, or similar uses, provided the building area does not exceed 256 square feet... 5. Fences of any height unless required for pedestrian safety as provided for by Section 3306 or used…
- Fairfax County Code Compliance, Building trade and unpermitted construction (September 2024). Checked 2026-10-20.
[Permits are often required for] decks, porches, sheds, and adding other detached structures exceeding 256 square feet.
- 44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19.
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
- 44 CFR 60.3, floodplain management criteria. Checked 2026-10-19.
Require permits for all proposed construction or other development in the community...