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Fairfax County, VA Accessory Structures: Tiny Homes (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

Tiny home rules in Fairfax County, VA, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.

Key Facts

Default classification
recreational vehicle or travel trailer
With permanent foundation
counts as single-family dwelling
Dwelling status requires
compliance with the USBC
Defined at
Zoning Ordinance § 9102

Summary

Fairfax County's Zoning Ordinance classifies a tiny house as a recreational vehicle or travel trailer unless it sits on a permanent foundation and is meant for continuous occupancy, in which case it counts as a single-family dwelling.

These county ordinances apply to unincorporated areas of Fairfax County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

Tiny House: A small structure constructed on a frame and capable of being transported on its own wheels. For the purposes of this Ordinance, if a tiny house includes a permanent foundation and is intended for continuous occupancy, it is considered a single-family detached dwelling and must meet the USBC. Otherwise, a tiny house is considered to be a recreational vehicle or travel trailer.

Source: Fairfax County - Accessory Living Unit (Administrative Permit)View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published.

Full Breakdown

Article 9's definition of 'Tiny House' in the Zoning Ordinance describes it as a small structure built on a frame that can be transported on its own wheels. Under Section 9102, that structure is treated as a recreational vehicle or travel trailer by default. It only becomes a single-family detached dwelling, required to meet the Uniform Statewide Building Code, if it has a permanent foundation and is intended for continuous occupancy.

Violations & Fines

A tiny house on wheels without a permanent foundation is regulated as an RV or travel trailer, not a dwelling; using it as a full-time residence outside RV rules can draw zoning enforcement for an unauthorized dwelling.

Frequently Asked Questions

Can I live in a tiny house on wheels in Fairfax County?
Only as a recreational vehicle or travel trailer under county rules: without a permanent foundation, a tiny house isn't classified as a legal single-family dwelling.
How does Fairfax County classify a tiny house?
Under Zoning Ordinance § 9102, it's a recreational vehicle or travel trailer unless built on a permanent foundation for continuous occupancy, in which case it's a single-family detached dwelling subject to the USBC.

Sources & Official References

Other rules in Fairfax County

Noise Ordinances: Construction HoursSome RestrictionsADU RulesSome RestrictionsShed & Carport RulesSome RestrictionsParking Rules: RV & Boat ParkingSignificant RestrictionsADU Owner OccupancySome RestrictionsNoise Ordinances: Leaf Blower RulesSome RestrictionsParking Rules: Towing & Impound RightsSignificant RestrictionsFence Regulations: Retaining WallsSome RestrictionsAnimal Ordinances: Veterinary Clinic ZoningSome Restrictions

All Fairfax County rules

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