Fairfax County, VA Accessory Structures: ADU Impact Fees (2026)

Impact fees, school fees, utility hookup charges, and waivers for ADUs. Many jurisdictions exempt ADUs under 750 sq ft from impact fees per state law.

Research in progress

We are currently verifying Fairfax County's specific local ordinance for adu impact fees. In the meantime,Virginia state law generally applies, and below you'll find guidance for finding the official rules and links to related Fairfax County ordinances we've already verified.

Virginia State Law Context

Virginia state law provides the baseline framework for adu impact fees across all municipalities in the state. Individual cities like Fairfax County may adopt additional local rules on top of state requirements, which is what makes checking your specific city ordinance important. For Fairfax County residents, the safest approach is to follow state law as a baseline and contact City Hall for any additional local requirements.

You can browse all Virginia accessory structures to see how cities across the state regulate this topic.

How to find official Fairfax County ADU Impact Fees rules

Search for "Fairfax County VA municipal code" to find your city's online code portal (Municode, eCode360, or American Legal Publishing are the most common).
Look for chapters covering accessory structures, zoning, nuisance, or property maintenance — that's where most adu impact fees rules live.
Contact Fairfax County City Hall's code enforcement, planning, or community development department for clarification.
Check with your HOA if applicable — many HOAs have stricter rules than the city itself.

Other accessory structures verified for Fairfax County

We've verified the following accessory structures for Fairfax County:

Accessory Structures: Detached Garages Accessory Structures: Sheds Fairfax County Carport Rules Fairfax County Tiny Home Rules Accessory Living Units in Fairfax County

Frequently Asked Questions

Does Fairfax County have a specific adu impact fees ordinance?

We are still researching Fairfax County's specific local ordinance for adu impact fees. In most cases, Virginia state law provides the baseline rules that apply throughout the state, and individual municipalities may add stricter local requirements on top.

Where can I find official adu impact fees rules for Fairfax County?

The most authoritative source is the Fairfax County municipal code, typically hosted on platforms like Municode, eCode360, or American Legal Publishing. You can also contact Fairfax County City Hall or the relevant city department directly. We are working to surface the specific code sections on this page soon.

What happens if I violate adu impact fees rules in Virginia?

Penalties vary by jurisdiction. Virginia state law sets minimum standards, while individual cities may impose additional fines or enforcement procedures. Code enforcement violations are typically handled through warnings, citations with monetary fines, and in repeat or serious cases, court proceedings.

Are there other accessory structures I should know about in Fairfax County?

Yes — accessory structures typically include several related rules. Check the related topics section on this page for Fairfax County-specific information that we have already verified.

Virginia State Law Context