The Fairfax County zoning ordinance is Chapter 112.2 of the county code, and it decides three things for every parcel in the county: what you can build, where on the lot you can put it, and what activities are allowed inside. It assigns each property to a zoning district, sets bulk rules like setbacks and height within that district, and channels anything outside those limits into a permit, variance, or rezoning process with its own fees and review timeline.1Fairfax County Zoning Ordinance. Article 1 – General Provisions
One thing worth knowing before you dig into older research: the Board of Supervisors adopted a modernized ordinance called zMOD effective July 1, 2021. It renumbered the chapter from 112.1 to 112.2 and reorganized many sections. If a plan, memo, or web page you’re relying on predates that date, verify each citation against the current ordinance on the county’s enCodePlus platform.2Fairfax County. Modernized Zoning Ordinance (zMOD) Approved; In Effect July 1, 2021
Zoning Districts
Article 2 places every parcel into one of four categories: residential, commercial, industrial, or planned development. The district assigned to your lot is the starting point for everything else.
Residential
Residential districts run from R-A (Rural Agricultural) and R-C (Residential-Conservation), which support large-lot single-family homes on multiple acres, up through R-1 at one dwelling per acre to R-30 at thirty dwellings per acre, which allows apartment and condominium buildings. A separate R-MHP district covers manufactured home parks.3Fairfax County. Zoning Districts Your district drives your minimum lot size, maximum building height, allowable density, and required setbacks.
Commercial and Industrial
Eight commercial districts, C-1 through C-8, span low-rise office transitional space at the low end to highway commercial uses at the high end, with neighborhood, community, and regional retail categories in between. Six industrial districts run from I-I, essentially an office campus setting, through I-2 research parks and light manufacturing, up to I-6 for heavy manufacturing, equipment yards, and major transportation terminals. Each step up loosens restrictions on noise, traffic, and environmental impacts while still imposing minimum performance standards.4Fairfax County Zoning Ordinance. 2104 – Industrial Zoning Districts
Planned Development
Planned development districts trade conventional zoning constraints for design flexibility, but they require the rezoning process. The six recognized types are PDH (Planned Development Housing), PRC (Planned Residential Community), PDC (Planned Development Commercial), PRM (Planned Residential Mixed-Use), PTC (Planned Tysons Corner Urban, aimed at transit-oriented development in Tysons), and PCC (Planned Continuing Care Facility) for senior living communities.5Fairfax County Zoning Ordinance. 2105 – Planned Districts
Bulk Regulations: Setbacks, Height, and Floor Area
Within each district, bulk regulations control the physical shape and placement of buildings. A project that violates bulk standards will not receive a building permit without a variance.
Minimum lot sizes vary widely by district. An R-A lot may require several acres per dwelling, while an R-30 lot can be much smaller. Height caps prevent buildings from overwhelming surrounding neighborhoods. Floor area ratio (FAR) limits total building square footage relative to lot size, so a 0.25 FAR on a 10,000-square-foot lot allows up to 2,500 square feet of floor area.6Fairfax County Zoning Ordinance. Fairfax County Zoning Ordinance
Setbacks fix the minimum distance between your building and each property line, front, side, and rear. They vary by district and sometimes by lot configuration. If you’re planning an addition or new construction, confirm your setback numbers before spending anything on design. A foot in the wrong direction stalls the whole project.
Accessory Structures, Home Businesses, and Accessory Living Units
Accessory Structures
Detached garages, sheds, pools, and fences all qualify as accessory structures. They must stay subordinate to the main dwelling in size and purpose and follow district-specific rules for height, placement, and setbacks. Fence height limits differ between front and rear yards. If you need to exceed the standards, a special permit from the Board of Zoning Appeals is available, with fees starting at $585 for single-family fence height increases.7Fairfax County Zoning Ordinance. 8102 – Fee Schedule
Home-Based Businesses
Article 4 allows home-based businesses through an administrative permit, but the standards are tighter than most people assume. Total area used for the business, including storage, cannot exceed 400 square feet. No signage is allowed. The home must keep the exterior appearance of a dwelling with no visible sign of commercial activity, and all operations must take place entirely inside enclosed structures.8Fairfax County Zoning Ordinance. Article 4 – Use Regulations – Section 4102.7.H Home-Based Business
On-site employees are limited to people who live in the home. One exception exists: an owner-occupied single-family detached dwelling may have one non-resident employee, but only between 7:00 a.m. and 6:00 p.m. That employee limit applies to the entire lot regardless of how many home businesses operate there.8Fairfax County Zoning Ordinance. Article 4 – Use Regulations – Section 4102.7.H Home-Based Business If those standards don’t fit your business, the BZA can grant a special permit that modifies specific requirements to allow outdoor activity, a larger work area, more employees, different hours, or additional customer visits. The special permit fee is $585.7Fairfax County Zoning Ordinance. 8102 – Fee Schedule
Accessory Living Units
Accessory living units (ALUs) are secondary dwelling spaces allowed only on lots with a single-family detached home, one per lot. Before zMOD, occupants had to be 55 or older or have a disability. That restriction is gone. Anyone can live in one now.9Fairfax County. Accessory Living Unit (Administrative Permit)
An ALU inside the principal dwelling can be approved administratively if it meets access, size, and parking standards. It cannot exceed 800 square feet or 40% of the home’s gross floor area, whichever is less, though a full basement or cellar may count up to its size as of July 1, 2021. Either the ALU or the main home must be owner-occupied, and no more than two people can live in the unit. Any new external entrance must be on the side or rear of the dwelling. Administrative permits are initially granted for two years, extendable up to five years based on compliance.9Fairfax County. Accessory Living Unit (Administrative Permit)
A detached ALU requires a special permit from the BZA and is only available on lots of at least two acres. Detached units can go up to 1,200 square feet but must remain clearly subordinate to the main house.9Fairfax County. Accessory Living Unit (Administrative Permit)
Overlay Districts You Might Not See on a Zoning Map
Overlays add requirements on top of the base district. Two catch homeowners off guard often enough to check for before any project.
Chesapeake Bay Resource Protection Areas
Properties near tidal wetlands, tidal shores, perennial streams, or connected nontidal wetlands may sit within a Resource Protection Area. The county requires a 100-foot vegetation buffer measured from those features, plus any land inside a major floodplain. Within the RPA, no development, land disturbance, or vegetation removal is allowed without prior approval from the Department of Land Development Services. Even removing dead trees or clearing invasive plants requires permission first.10Fairfax County. Chesapeake Bay Preservation Ordinance
If a perennial stream runs through or near your lot, that buffer can eliminate a large share of your buildable area. Check for an RPA designation before drafting anything.
Historic Overlay Districts
Section 3101 governs Historic Overlay Districts. The Architectural Review Board reviews rehabilitation, new construction, and exterior alterations against adopted design guidelines.11Fairfax County. Historic Overlay Districts Demolishing or moving a building in a historic district without ARB or Board of Supervisors approval carries a civil penalty that can reach the full assessed market value of the property, including both the structure and the land.12Fairfax County Zoning Ordinance. 8106 – Enforcement – Section: Penalties
How to Apply and What It Costs
Rezonings, special exceptions, special permits, and variances all go through the Planning and Land Use System (PLUS) portal. You create the application there, submit supporting documents, pay fees, track status, and receive notifications.13Fairfax County. What is PLUS? Most submissions require a certified plat or site plan prepared by a licensed professional showing boundaries, topography, existing and proposed structures, and utilities.
Fees
Filing fees vary widely by request type. A sample from the current schedule:7Fairfax County Zoning Ordinance. 8102 – Fee Schedule
- Residential fence height variance: $585
- Setback modification variance: $1,230
- General variance (all other types): $11,045
- Accessory living unit special permit: $585
- Home-based business special permit: $585
- General special permit or special exception: $22,105
Those numbers cover only the county’s processing. Budget separately for the surveyor who prepares the plat, the engineer or architect for site plans, and a land use attorney if the case goes to the BZA or Board of Supervisors.
Timeline
After you submit, staff run an intake review for completeness before assigning the file to an evaluator who analyzes impacts on infrastructure, traffic, and environmental resources. The process routinely spans several months. Rezonings, special exceptions, and variances involve coordination among the Department of Planning and Development, Planning Commission, Board of Supervisors, and BZA as applicable.14Fairfax County. Zoning Applications and Development Review
In a rezoning, the county expects the developer to address the project’s own impacts through voluntary proffers, written commitments to fund or provide items such as schools, parks, transportation improvements, or affordable housing. Approved proffers become legally binding.15Fairfax County. Proffer Compliance
Variances and the Six-Criteria Test
The Board of Zoning Appeals hears variance and special exception applications and appeals of Zoning Administrator decisions. To win a variance, you must satisfy all six criteria the BZA evaluates: the applicant did not create the hardship; the variance will not substantially harm neighboring properties; the situation is specific enough that a general ordinance amendment would not be practical; the variance does not effectively rezone the property or change its use classification; relief is not already available through a special exception or special permit; and the variance aligns with the ordinance’s purposes and the public interest.16Fairfax County. Variance Application Information Missing even one sinks the application, which is why experienced land use attorneys will tell you upfront whether a case has a realistic chance.
Enforcement, Penalties, and Your 30-Day Appeal Window
Enforcement starts with voluntary compliance. The county’s stated goal is to work with owners to fix violations rather than lead with fines. If voluntary compliance fails, the county can ask a court to impose penalties and order the violation abated.17Fairfax County. Notices of Violation
The penalty ladder sits in the ordinance itself. A first violation is an infraction with a $200 civil penalty. Later violations arising from the same facts are $500 each. Each day the violation continues counts as a separate offense, but the county cannot charge more frequently than once every ten days, and total civil penalties from one set of facts are capped at $5,000. Once penalties reach that ceiling, the violation can be elevated from a civil infraction to a criminal misdemeanor punishable by a fine of up to $1,000.12Fairfax County Zoning Ordinance. 8106 – Enforcement – Section: Penalties
If you receive a Notice of Violation and believe it was issued in error, you have 30 days from the date of the decision to file an appeal with the Board of Zoning Appeals.18Fairfax County. Board of Zoning Appeals – Appeals Process Miss that window and the decision stands.
When the Rules Change: Nonconforming and Noncompliant Properties
Properties that were legal under the old rules but fall short of the new ones get special treatment. Virginia law protects vested rights: if you obtained a significant governmental approval, relied on it in good faith, and spent substantial money pursuing the project, your rights are generally protected from later zoning amendments.19Virginia Code Commission. Virginia Code Chapter 22 – Planning, Subdivision of Land and Zoning – Section 15.2-2307
Fairfax County separates “nonconforming” from “noncompliant.” A noncompliant structure or use met all requirements when developed but no longer satisfies current lot size or shape standards. Noncompliant uses can continue and may even be enlarged, as long as the expansion complies with current district regulations (other than lot size or shape) and meets parking requirements. Uses that were lawful before zMOD and now require a special exception or special permit are classified as noncompliant rather than nonconforming, so they can continue operating.
Signs are treated more strictly. A nonconforming sign that lawfully existed when the ordinance took effect may remain but cannot be enlarged, relocated, or structurally modified. If it’s damaged beyond 50% of its appraised value, it must be rebuilt to current standards or removed. A sign on property that sits vacant for two years is considered abandoned and must come down.