Bolthole Index

Fairfax County, Virginia

Building permits, zoning and land rules in Fairfax County, Virginia

36Index Score / 100
#112 of 133 in Virginia

Fairfax County, Virginia requires building permits for new homes, including detached houses, duplexes and townhomes, and requires inspections before residential occupancy123. County zoning controls parcel uses and district requirements4. For land without public sewer service, the Fairfax County Health Department handles septic permits and inspections under state and local rules567.

At a glance

Building permit
Required for regulated construction through Fairfax County Land Development Services8
Zoning
Countywide; identify the parcel's zoning district before applying its rules49
Septic permits
Required for onsite-system construction and repairs through the Health Department56
Owner-builder
Conditional; submit the notarized license-exemption affidavit before permit issuance10
Occupancy approval
A Residential Use Permit follows required final and trade inspections23
RV or tiny-home living
RV habitation is prohibited in public rights-of-way; private-lot RV and tiny-home occupancy remains unconfirmed11
Accessory living unit
Allowed with limits on location, size, occupancy, ownership and permitting12

Who to call

Building permits

Fairfax County Land Development Services

Building permit applications, plan review, and inspections countywide

703-222-0801

landdevelopmentservices@fairfaxcounty.gov

12055 Government Center Pkwy, Fairfax, VA 22035

Zoning

Fairfax County Department of Planning and Development, Zoning

Zoning verification, setbacks, and zoning permit review countywide

703-222-1082

dpdzoningpermits@fairfaxcounty.gov

Health department

Fairfax County Health Department, Division of Environmental Health

Onsite sewage (septic) and private well permitting and inspection countywide, applying Virginia Department of Health regulations

703-246-2201

hdehd@fairfaxcounty.gov

10777 Main Street, Fairfax, VA 22030

Roads & driveways

VDOT Northern Virginia District, Fairfax Permits

Land use (entrance) permits for driveways and work in VDOT right-of-way on state-maintained roads in Fairfax County

703-259-1773

novafairfaxpermits@vdot.virginia.gov

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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Do you need a building permit in Fairfax County, Virginia?

Yes. Fairfax County requires a building permit for a new detached house, duplex or townhouse, with applications submitted through PLUS1. New applications and construction must follow the 2021 code requirements; technical provisions from different editions cannot be mixed13. The statewide code that Fairfax County enforces exempts a one-story detached storage shed or playhouse of 256 square feet or less and a detached utility building of 150 square feet or less from building permits, but the building official may still require a permit for exempt items in a special flood hazard area1415. A qualifying nonresidential farm building used primarily for farming is exempt from the Building Code, except for a farm building or portion operated as a licensed restaurant; applicable flood-proofing rules still remain16. Residential projects must pass required building and trade inspections before occupancy2. Fairfax County requires occupancy approval for a new structure or premises or a change in use, and the residential approval is a Residential Use Permit3.

Who is the Fairfax County building department, and how do you reach it?

Fairfax County Land Development Services handles building permit applications, plan review and inspections at 12055 Government Center Pkwy, Fairfax, VA 22035; call 703-222-0801 or email landdevelopmentservices@fairfaxcounty.gov17. The Department of Planning and Development's Zoning office answers parcel-use and setback questions at 703-222-1082 or dpdzoningpermits@fairfaxcounty.gov18. Fairfax County publishes its permitting workflow through Land Development Services and PLUS; the application may require plans, professional credentials, fees, inspections and occupancy approval depending on the project19. Covered work needs a permit before it begins, although the building official can authorize work while an application is pending in specified circumstances20. New homes require building permits, and new structures, new premises and changes in use require occupancy approval13.

Does Fairfax County have zoning?

Yes. Fairfax County's Zoning Ordinance regulates land uses and structures through distinct zoning districts21. Use the county's Zoning District Analyzer to identify the parcel's district before applying its allowed uses and dimensional requirements9. Setbacks vary by structure and parcel: an accessory structure between 8.5 and 12 feet high must sit at least 5 feet from side and rear lot lines, while taller structures face different rules22. One accessory living unit may accompany a single-family detached dwelling, subject to location, size, occupancy, owner-occupancy, recordation and permitting conditions; Health Department approval is required when the property uses a well or septic system12. Short-term lodging is allowed as an accessory use in residential-permitting districts but not in an accessory living unit or detached accessory structure23. We could not confirm one countywide minimum home or lot size, so ask Zoning about the parcel's district18.

How do septic permits work in Fairfax County?

The Fairfax County Health Department administers state and local rules for onsite sewage systems and private wells5. The department reviews installation drawings, issues septic construction and repair permits, and performs installation-related inspections67. Alternative systems require an inspection within 180 days after approval and annually afterward7. Published new-construction fees for a sewage system with flow no more than 1,000 gallons per day include a $200 county fee and a $215 state fee, with other fees potentially applying24. Geothermal wells in Fairfax County require a Health Department permit and a licensed Well Water Supply Provider25. Only about 9.1% of county soils lack severe limitations for a conventional drain field, so arrange a site evaluation early26. When public sewer service is available in the approved service area, a connection permit and paid sewer fees are required27.

Can you live in an RV or tiny home on your land in Fairfax County?

Fairfax County prohibits using or occupying an RV for human habitation on public property or in a street, alley or other public right-of-way, except in a designated public campground, recreational park or licensed mobile home park11. We could not confirm a complete Fairfax County rule allowing long-term RV living or tiny-home occupancy on an ordinary private residential lot, so ask the Zoning office before treating either as a lawful dwelling18. Virginia's campground permit rules do not establish a right to live in an RV on a private residential lot28. Fairfax County provides a narrow temporary manufactured-home route after a detached home is damaged or destroyed: the lot must allow that house type, approved sanitation is required, and the administrative permit lasts no longer than 9 months or the active building-permit period, whichever is shorter29.

Building a home in Fairfax County: the steps, in order

  1. Use the Zoning District Analyzer, then confirm the parcel's allowed use and applicable setbacks with the Zoning office918.
  2. Request a floodplain use determination if development is proposed in or near a regulatory floodplain30.
  3. Determine whether public sewer is available; otherwise begin onsite-sewage review with the Health Department276.
  4. Obtain a VDOT land-use permit before constructing or modifying an entrance on a state-maintained road31.
  5. Apply through Land Development Services and PLUS; an owner using the contractor-license exemption must submit a notarized affidavit before permit issuance11017.
  6. Schedule and pass the required building and trade inspections2.
  7. Receive the Residential Use Permit before moving into the home3.

What should you check before buying land in Fairfax County?

Start with the parcel's zoning district, because Fairfax County's published district rules determine permitted uses and requirements9. Confirm public-sewer availability before pricing the site: a buildable-looking parcel may instead need onsite-sewage approval, and only about 9.1% of county soils lack severe limits for a conventional drain field27626. Check whether access touches VDOT right-of-way, because a new or modified entrance on a state-maintained highway requires a land-use permit31. Development in or near a regulatory floodplain requires a county floodplain use determination30. Typical county property-tax bills are about $7,072 per year at an effective rate near 1%3233.

Watch-outs

  • A Fairfax County owner-builder license exemption is conditional, not a building-permit exemption: the property owner must submit a notarized license-exemption affidavit before permit issuance10.
  • An accessory living unit must share the principal dwelling's driveway and curb cut; a proposed garage or carport must directly adjoin an existing one34.
  • RV habitation is prohibited in Fairfax County public rights-of-way, while ordinary private-lot RV or tiny-home occupancy remains unconfirmed; ask the Zoning office before purchase or placement1118.
  • Virginia law taking effect July 1, 2027 will require localities to treat accessory dwelling units as a permitted accessory use in single-family residential zoning districts, subject to listed conditions; Fairfax County's current accessory living unit rules stay in force until then, so confirm with the Zoning office before relying on either3518.

Sources

  1. Does My Project Require a Permit?, quoted and re-checked
  2. Certificate of Occupancy (Residential Use Permit - RUP), quoted and re-checked
  3. Certificate of Occupancy (Non-Residential Use Permit), quoted and re-checked
  4. Fairfax County Zoning Ordinance, quoted and re-checked
  5. Onsite Sewage Disposal and Private Well Water Systems, quoted and re-checked
  6. Onsite Sewage Disposal and Private Well Water Systems, quoted and re-checked
  7. Onsite Sewage Disposal and Private Well Water Systems, quoted and re-checked
  8. Does My Project Require a Permit? (2026 county census)
  9. Fairfax County Zoning Ordinance, quoted and re-checked
  10. License Exemption Affidavit and Info Sheet, quoted and re-checked
  11. Section 82-5-42 – Habitation in vehicles parked in public right-of-way, quoted and re-checked
  12. Accessory Living Unit (Administrative Permit), quoted and re-checked
  13. Adoption of the 2021 Virginia Uniform Statewide Building Code (USBC), quoted and re-checked
  14. 13VAC5-63-80. Section 108 Application for permit (Virginia statewide rule), quoted and re-checked
  15. 13VAC5-63-80. Section 108 Application for permit (Virginia statewide rule), quoted and re-checked
  16. Code of Virginia § 36-99. Provisions of Code; modifications (Virginia statewide rule), quoted and re-checked
  17. Fairfax County Land Development Services (fairfaxcounty.gov)
  18. Fairfax County Department of Planning and Development, Zoning (fairfaxcounty.gov)
  19. Connect to the Public Sanitary Sewer System, quoted and re-checked
  20. 13VAC5-63-80. Section 108 Application for permit (Virginia statewide rule), quoted and re-checked
  21. Planning and Zoning Review, quoted and re-checked
  22. Zoning Requirements - What Can I Do With My Property?, quoted and re-checked
  23. Short-Term Lodging - Frequently Asked Questions, quoted and re-checked
  24. Environmental Health Fees Schedule, quoted and re-checked
  25. Onsite Sewage Disposal and Private Well Water Systems, quoted and re-checked
  26. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  27. Connect to the Public Sanitary Sewer System, quoted and re-checked
  28. 12VAC5-450 Rules and Regulations Governing Campgrounds (Virginia statewide rule), quoted and re-checked
  29. Temporary Dwelling or Manufactured Home (Administrative Permit), quoted and re-checked
  30. Floodplain Use Determination (FPUD), quoted and re-checked
  31. Land use permits (Virginia statewide rule), quoted and re-checked
  32. Median property tax bill: Bolthole Index county data
  33. Effective property tax rate: Bolthole Index county data
  34. Accessory Living Unit (Administrative Permit), quoted and re-checked
  35. Code of Virginia § 15.2-2292.4 — Development and use of accessory dwelling units (Virginia statewide rule), quoted and re-checked

Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like all 6 of its neighbors, Fairfax County requires a building permit for a home.

RuleFairfax CountyManassas Park CityFairfax CityManassas CityPrince William CountyFalls Church CityArlington County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Health Dept.Not publishedVDHVDHVDHVA Dept. of HealthVDH

County locator

Fairfax County in Virginia

36
County map
Fairfax County highlighted among the Virginia counties · colored by Index score

How Fairfax County scores

Seclusion10100% ev.
Self-Sufficiency63100% ev.
Admin Boringness44100% ev.
Durability85100% ev.
Property Autonomy66100% ev.
Carry Cost32100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$779kTypical home
1%Property tax
$17,494Land / acre
43.2"Annual rain
2.2% of yrsSevere drought
5.9 / yr (+5.6)Mid-century 100°F days
12.9 daysMid-century dry spell
2.07" (+5.5%)Mid-century 1-day rain
1.47×Wildfire change factor
100%Forward climate coverage
$1,412Home insurance / yr
2.1% / yrInsurance growth
0.97%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
1,945,020People within 30 min
11,723,126People within 2 hr
2,074,470Radius comparison (15 mi)
2,920.2People / sq mi
5.5%Federal land
87%Land at 15% slope or less
9.1%Soils rated "not limited" for septic (strict USDA rating)
17,587 acWorkable land screen
75.1 tonsBiomass / forest ac
56.3°FAvg temp

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Cities and towns in Fairfax County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Town of Clifton

Answers from the rulebook for Fairfax County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Fairfax County rules

  • Building permitRequired

    New residential homes in Fairfax County, including detached single-family homes, duplexes and townhomes.

    • The county page states that the list is not exhaustive and is general guidance.
    • Permits are applied for through the Planning and Land Use System (PLUS).
    • Additional site-related, zoning, floodplain, resource-protection-area, health-department, or VDOT approvals may be required depending on the project.
    “A permit IS required for[...]New homes Includes detached single-family homes, duplexes and townhomes.”
  • Owner-builder exemptionAvailable (with conditions)

    Owner or other qualifying person performing or supervising construction or improvement without a licensed contractor.

    • The primary-residence exemption is limited to no more than one primary residence owned by the person and used by that person during any 24-month period.
    • The owner must complete and submit the License Exemption Affidavit before permit issuance.
    • The owner must comply with the Virginia Uniform Statewide Building Code.
    • Regulated individual licenses or certifications may still be required.

    primary residences: 1 per 24 months (Must be owned by and for the person's own use)

    “Person who performs or supervises the construction, removal, repair or improvement of no more than one primary residence owned by him and for his own use during any 24-month period;”
    One more reviewed finding on this topic
    • Conditional — Owner or lessee using Fairfax County's license-exemption affidavit process for qualifying owner/developer work.
      “This affidavit must be completed by the property owner listed on the application and must be submitted prior to permit issuance.”
  • InspectionsRequired

    Building and mechanical, electrical, and plumbing work subject to Fairfax County permits.

    • The permit holder must schedule inspections.
    • Related inspections may need to be scheduled as combination inspections.
    • Failure to bundle inspections properly may result in a failed inspection and reinspection fee.
    “Building and trade (mechanical, electrical, and plumbing) inspections are required by state law to ensure construction meets current codes”
    2 more reviewed findings on this topic
    • Required — Residential projects seeking a Residential Use Permit before occupancy.
      “Ensure all required building inspections passed (final, footing, framing, slab, insulation, wall, waterproofing).”
    • Required — Building inspections associated with residential and commercial construction and occupancy approvals.
      “Ensure all required building inspections passed (final, footing, framing, slab, insulation, wall, waterproofing).”
  • Certificate of occupancyRequired

    Residential and nonresidential occupancy and use of new structures or premises, and changes in use.

    • Residential projects use a Residential Use Permit (RUP).
    • Commercial projects use a Non-Residential Use Permit (NonRUP).
    • Businesses in the Town of Vienna are directed to the town for NonRUP process.
    • A post-occupancy Fire Marshal inspection is required within five days after a NonRUP when the occupancy is in use.

    NonRUP fee: 95 USD

    “A Certificate of Occupancy is required for occupancy or use of a new structure or premises, or a change in use of an existing structure or premises.”
    2 more reviewed findings on this topic
    • Required — New structures or premises and changes in use of existing structures or premises.
      “A Certificate of Occupancy is required for occupancy or use of a new structure or premises, or a change in use of an existing structure or premises.”
    • Required — Initial and continued occupancy and use of structures or land; residential RUP and commercial NonRUP processes apply.
      “A Certificate of Occupancy is required to approve both the initial and continued occupancy and use of the structure or land to which it applies.”
  • County-wide zoningPresent (with conditions)

    County zoning ordinance and zoning administration in Fairfax County.

    • The county zoning ordinance governs land use and district requirements; incorporated municipalities may administer separate local rules.
    “The Fairfax County Zoning Ordinance is available on Encode, a web-based platform that also hosts the County’s Comprehensive Plan and Public Facilities Manual.”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning ordinance and zoning-district regulations administered by Fairfax County.
      “The Fairfax County Zoning Ordinance is available on Encode, a web-based platform that also hosts the County’s Comprehensive Plan and Public Facilities Manual.”
  • Local zoningPresent (with conditions)

    Land use and structures in Fairfax County under the Fairfax County Zoning Ordinance.

    • The Fairfax County Zoning Ordinance is Chapter 112 of the County Code.
    • The ordinance creates distinct zoning districts and regulates land use and structures.
    • Specific allowable uses and restrictions depend on the applicable zoning district and project review.
    • The source describes county zoning administration; it does not establish separate municipal or town zoning administration within the county.
    “The Fairfax County Zoning Ordinance is Chapter 112 of the County Code.”
  • Zoning districtsPublished (with conditions)

    Fairfax County zoning districts and their classifications, allowed uses, and requirements.

    • The county directs users to the Zoning District Analyzer to determine the zoning district for a property.
    • District-specific requirements and allowed uses must be consulted.
    “After determining the Zoning District of the property the user can determine what specific uses are allowed in this district and other information regarding the district classification and it's requirements in the Zoning Ordinance.”
    2 more reviewed findings on this topic
    • Published (with conditions) — Fairfax County zoning-district classifications and requirements.
      “To determine the Zoning District of your property, please use the Zoning District Analyzer interactive map.”
    • Published — Published Fairfax County zoning districts and district-specific requirements.
      “After determining the Zoning District of the property the user can determine what specific uses are allowed in this district and other information regarding the district classification and it's requirements in the Zoning Ordinance.”
  • SetbacksSpecified

    Accessory structures under Fairfax County zoning regulations.

    • Structures 8.5 feet or less may be located anywhere in side or rear yards.
    • Structures between 8.5 and 12 feet must be at least five feet from side and rear lot lines.
    • Structures over 12 feet are subject to height-based rear setbacks and the minimum side setback for the lot.
    • No accessory structure may be located in a minimum front setback or, on lots of 36,000 square feet or less, in a front yard.

    side/rear setback for accessory structure 8.5-12 feet high: >= 5 feet

    “An accessory structure that is between 8 ½ feet and 12 feet in height must be located at least five feet from the side and rear lot lines.”
  • Living in an RVProhibited

    Use or occupancy of a recreational vehicle for human habitation on public property, streets, avenues, alleys, or other public right-of-way in Fairfax County.

    • Exception: use or occupancy is allowed in a designated public campground, recreational park, or licensed mobile home park.
    “It shall be unlawful for any person to use, occupy, or permit the use or occupancy of any automobile, truck, camper, house car, mobile home, recreational vehicle, trailer, trailer coach, or similar equipment for human habitation on any public property, street, avenue, alley, or other public right-of-way within Fairfax County, except in a designated public campground, recreational park, or licensed mobile home park.”
  • Manufactured homesLimited

    Temporary manufactured-home occupancy following destruction or damage of an uninhabitable single-family detached dwelling.

    • An administrative permit is limited to nine months or the period of an active building permit, whichever is shorter, subject to possible extension while construction is diligently pursued.
    • The lot must permit a single-family detached dwelling.
    • Health Department-approved sanitary facilities are required.
    • Occupancy ends when reconstruction is completed or the permit expires.
    • Additional conditions may be imposed by the Zoning Administrator.

    maximum administrative-permit period: <= 9 months (or the period of an active building permit, whichever is shorter)

    “An administrative permit may be issued for a period not to exceed nine months or for the period of an active building permit, whichever is shorter.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory living units, also referred to as accessory dwelling units, in Fairfax County.

    • Administrative approval is available for qualifying interior units within a single-family detached dwelling.
    • No more than one accessory living unit is permitted per single-family lot.
    • The unit must be wholly contained within the principal dwelling and connected through an interior space.
    • Maximum size is generally 800 square feet or 40% of the principal dwelling's gross floor area, whichever is less.
    • The unit may have no more than two bedrooms and no more than two occupants.
    • Either the accessory unit or principal dwelling must be owner-occupied.
    • Additional parking, building, safety, health, and sanitation requirements apply.
    • If served by well or septic, Health Department approval is required before zoning approval.
    • Detached units require special-permit approval and are limited to lots of at least two acres and 1,200 square feet.

    maximum occupants: <= 2 people · maximum interior unit size: 800 or 40% of principal dwelling gross floor area, whichever is less text (Subject to special-permit exceptions)

    “An accessory living unit is permitted only in association with a single-family detached dwelling unit, and no more than one accessory living unit is permitted on a single-family lot.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory living units associated with single-family detached dwellings.
      “An accessory living unit is permitted only in association with a single-family detached dwelling unit, and no more than one accessory living unit is permitted on a single-family lot.”
  • Who permits septicMixed (with conditions)

    Fairfax County Health Department administration of state and local onsite sewage and private-well regulations.

    • The program administers both state and local regulations.
    “Fairfax County Health Department's Onsite Sewage and Water Program administers state and local regulations for sewage disposal systems and private well water supplies to ensure proper construction, operation and maintenance in Fairfax County.”
    2 more reviewed findings on this topic
    • Mixed — Private sewage-disposal systems and private wells in Fairfax County.
      “Fairfax County Health Department's Onsite Sewage and Water Program administers state and local regulations for sewage disposal systems and private well water supplies to ensure proper construction, operation and maintenance in Fairfax County.”
    • Mixed (with conditions) — Onsite sewage disposal and private well water systems in Fairfax County.
      “Fairfax County Health Department's Onsite Sewage and Water Program administers state and local regulations for sewage disposal systems and private well water supplies”
  • Septic permitRequired

    Construction and repair of onsite sewage systems administered by the Fairfax County Health Department.

    • Shallow onsite sewage systems receive conditional permits.
    • Conditional permits and associated plats must be recorded in Fairfax County land records.
    • A written repair permit is required for system malfunction before work begins.
    “Reviewing installation drawings and issuing construction permits.”
    2 more reviewed findings on this topic
  • Septic inspectionRequired

    Onsite sewage systems, including construction and alternative systems.

    • A septic layout inspection occurs before the OSS construction permit is issued.
    • Alternative systems require inspection within 180 days after approval, annual inspection, and sampling once every five years.
    • Non-VPDES onsite sewage systems require septic-tank pumping at least once every five years.

    alternative-system initial inspection: <= 180 days (From date of system approval) · alternative-system inspection frequency: per 1 year · septic tank pump-out frequency: per 5 years (Systems not requiring a Virginia Pollutant Discharge Elimination System permit)

    “Alternative Onsite Sewage Systems are required to be inspected and sampled by a qualified Alternative Onsite Sewage System Operator within 180 days from the date of system approval.”
    One more reviewed finding on this topic
    • Required — Onsite sewage system installation and specified alternative onsite sewage systems.
      “Alternative Onsite Sewage Systems are required to be inspected and sampled by a qualified Alternative Onsite Sewage System Operator within 180 days from the date of system approval. The system must then be inspected annually and sampled once every five years.”
  • Well permitLimited

    Geothermal wells in Fairfax County.

    • Geothermal wells require a Fairfax County Health Department permit.
    • Installation must be performed by a licensed Well Water Supply Provider.
    “Installation of geothermal wells require a permit from Fairfax County Health Department and must be installed by a licensed Well Water Supply Provider.”
  • Mandatory utility hookupConditional

    Connection of buildings to the public sanitary sewer system where sewer service is available.

    • A sewer connection permit is required when service is available.
    • Only a licensed plumber may obtain a permit to tap the sewer main, except that a homeowner may connect to an existing spur and install the line to the house.
    • Required sanitary sewer fees must be paid before permit issuance.
    • Single-family sewer availability generally uses a 300-foot distance; other buildings use 500 feet, according to the county page.
    “When sewer service is determined to be available for a property, a permit is required to connect the building to the system.”
    One more reviewed finding on this topic
    • Sewer (with conditions) — Buildings connecting to Fairfax County's public sanitary sewer system where sewer service is available.
      “When sewer service is determined to be available for a property, a permit is required to connect the building to the system.”
  • Driveway accessLimited

    Driveway and curb-cut access for accessory living units.

    • Any proposed garage or carport must be directly adjacent to an existing garage or carport.
    • The associated driveway and curb cut must be the same as the principal dwelling's driveway and curb cut.
    “Any proposed garage or carport must be located directly adjacent to any existing garage or carport, and the associated driveway and curb cut must be the same as that which serves the principal dwelling.”
  • Building in a floodplainRequired

    Proposed development activity in or near a regulatory floodplain in Fairfax County.

    • A floodplain use determination is required when the proposed development activity is in or near a regulatory floodplain.
    • The director of Land Development Services must review all proposed uses and development to determine whether the land is within a floodplain.
    • If the land is within a floodplain, the director determines whether the proposed use or development may be permitted under county floodplain regulations.
    • Depending on project scope, a separate building permit record in PLUS may also be required.
    • Property owners or duly authorized agents may submit the floodplain use determination request.
    • The request is submitted online in PLUS under the Site tab.
    • First-time PLUS users must register for an account.
    • The county warns that the listed process is the most common process and is not representative of all conditions that may be encountered.
    “A floodplain use determination is required when a proposed development activity is in or near a regulatory floodplain.”
    One more reviewed finding on this topic
    • Limited — Improvements located within a Fairfax County floodplain or resource protection area.
      “Separate county approval may be required if the proposed improvement is located within a floodplain or resource protection area (RPA).”
  • Short-term rentalsLimited

    Short-term lodging as an accessory use in residential-permitting zoning districts.

    • STLs are permitted as an accessory use in zoning districts that permit residential uses.
    • STLs are prohibited in detached accessory structures, accessory living units, temporary family health care structures, affordable dwelling units, and workforce dwelling units.
    • The source establishes zoning permission but does not establish all permit-process requirements.

    short-term lodging duration: < 30 days

    “No, STLs are prohibited in detached accessory structures, accessory living units, temporary family health care structures, affordable dwelling units or workforce dwelling units.”
  • Permit feesPublished (with conditions)

    Fairfax County Health Department environmental-health permits and related sewage fees.

    • Fees vary by permit type and sewage flow.
    • State fees and county fees may both apply.

    new construction county fee, sewage disposal system flow <=1000 GPD: 200 USD (state fee and other listed fees may also apply) · new construction state fee, sewage disposal system flow <=1000 GPD: 215 USD (county fee and other listed fees may also apply)

    “New Construction Permit (County Fee) - Sewage Disposal System with flow of 1000 GPD or less | $ 200.00”
  • Permit processPublished (with conditions)

    Fairfax County permitting through Land Development Services and PLUS.

    • Some permit types require licensed professionals.
    • Applications may require inspections, plan approvals, fees, and occupancy approvals.
    • Sewer connections use PLUS and require the applicable sewerage-service application.
    “Permits are applied for in the Planning and Land Use System (PLUS) where applications are commonly referred to as records.”

Virginia rules that apply here

  • Building code adoptedAdopted (with conditions)

    Virginia Uniform Statewide Building Code enforced in Fairfax County.

    • Administrative provisions became effective January 18, 2024.
    • Applicants could choose 2018 or 2021 technical provisions from January 18, 2024 through January 17, 2025.
    • Beginning January 18, 2025, all new building permit applications and construction must meet the 2021 USBC requirements.
    • Mixing technical provisions between editions is prohibited.
    • The 2021 USBC includes Virginia-specific technical amendments.

    code edition: 2021 USBC · effective date: 2024-01-18 (Administrative provisions; technical transition period through 2025-01-17)

    “Beginning January 18, 2025, all new building permit applications and construction must meet the 2021 USBC requirements.”
    2 more reviewed findings on this topic
    • Adopted (with conditions) — Virginia Uniform Statewide Building Code and Statewide Fire Prevention Code enforced in Fairfax County.
      “Fairfax County is required to enforce the Virginia Uniform Statewide Building Code (USBC) and the Statewide Fire Prevention Code (SFPC).”
    • Adopted (with conditions) — Construction of new buildings, structures, and additions; maintenance, repair, renovation, and changes in use of existing buildings and structures throughout Virginia.
      “The effective date of the 2021 Uniform Statewide Building Code, 2021 Statewide Fire Prevention Code, 2021 Industrialized Building Safety Regulations and the 2021 Amusement Device Regulations is Jan. 18, 2024.”
  • Agricultural exemptionConditional

    Farm buildings and structures under the Virginia Uniform Statewide Building Code.

    • A farm building or structure is not used for residential purposes, is located on property where farming operations take place, and is used primarily for a listed farm use.
    • The exemption does not apply to a building or portion of a building on a farm that is operated as a restaurant and licensed by the Board of Health under Chapter 2 (§ 35.1-11 et seq.) of Title 35.1.
    • Farm buildings and structures in a flood plain or mudslide-prone area remain subject to applicable flood-proofing or mudslide regulations.
    • A qualifying agritourism farm building or structure where the public is invited to enter and which is used for display, sampling, or sale described in § 36-99 must have portable fire extinguishers, a simple written emergency plan, and the required exemption sign.
    “Notwithstanding the provisions of this section, farm buildings and structures shall be exempt from the provisions of the Building Code, except for a building or a portion of a building located on a farm that is operated as a restaurant as defined in § 35.1-1 and licensed as such by the Board of Health pursuant to Chapter 2 (§ 35.1-11 et seq.) of Title 35.1.”
  • Subdividing landRegulated (with conditions)

    Subdivision of land and its development in every Virginia locality.

    • The governing body of every locality must adopt the ordinance; the resulting subdivision controls are administered through the applicable locality's ordinance.
    “The governing body of every locality shall adopt an ordinance to assure the orderly subdivision of land and its development.”
  • Campground & park staysLimited

    Recreational vehicles and other camping units offered as campsites in Virginia campgrounds, including facilities with three or more campsites and travel-trailer camps; this claim does not establish a general residential right to occupy an RV outside the specified campground framework.

    • A campground includes land or facilities accommodating camping units for periods of overnight or longer and includes travel trailer camps.
    • A campground must be permitted by the Virginia Department of Health and is inspected annually by local health department staff.
    • Offering three or more campsites may require a campground permit, including short-term or online-advertised camping.
    • Temporary campground permits allow up to 14 days of temporary camping, consecutively or nonconsecutively, within a 60-day period.
    • Temporary campgrounds must provide at least one portable toilet per 75 campers, make sewage-tank pumping available when RVs are present, and provide an acceptable water source.
    • The statutory definition excludes property where an individual owner may choose to camp, provided the owner is not prohibited or encumbered by covenants, restrictions, or conditions from providing sanitary facilities within the owner's property lines.
    • Other exclusions include summer camps, migrant labor camps, parks for manufactured homes, construction camps, and storage areas for unoccupied camping units.

    minimum campsites for campground definition: >= 3 campsites (The individual-owner camping exception and other statutory exclusions apply.) · temporary campground permit duration: <= 14 days (In a 60-day period, consecutively or nonconsecutively.) · temporary campground permit period: 60 days · portable toilets: per 1 per 75 campers (Temporary campgrounds.)

    “"Campground" means any area, place, parcel, or tract of land, by whatever name called, on which three or more campsites are occupied or intended for occupancy, or facilities are established or maintained, wholly or in part, for the accommodation of camping units for periods of overnight or longer [...] "Camping unit" means any device or vehicular type structure for use as temporary living quarters or shelter during periods of recreation, vacation, leisure time, or travel, including any tent, tent trailer, travel trailer, camping trailer, pickup camper, or motor home.”
    One more reviewed finding on this topic
  • county zoning authorityGeneral

    Virginia counties adopting and administering zoning ordinances over unincorporated territory statewide.

    • The zoning power is exercised by county governing bodies through ordinance.
    • County zoning jurisdiction covers unincorporated territory; incorporated areas are under municipal jurisdiction.
    • The statute permits regulation of land uses, structures, dimensional standards, open spaces, and excavation or mining, including residential and flood-plain uses.
    “For the purpose of zoning, the governing body of a county shall have jurisdiction over all the unincorporated territory in the county, and the governing body of a municipality shall have jurisdiction over the incorporated area of the municipality.”
  • county building authorityGeneral

    Virginia counties administering and enforcing the Uniform Statewide Building Code and issuing building permits for construction, including residential construction, in county jurisdiction.

    • Virginia's building code is a Uniform Statewide Building Code adopted by the State Board; it supersedes county building codes and regulations.
    • The county's role is local administration and enforcement through a local building department, not independent adoption of a conflicting county building code.
    • A county without a building department or local board of Building Code appeals must enter an agreement with another county, municipality, agency, or approved state agency for enforcement and appeals.
    • A town with a population of less than 3,500 may elect to administer and enforce the Building Code; if it does not, the county administers and enforces the Code for that town.
    • Buildings may be inspected before completion and are not deemed compliant until approved by the inspecting authority; inspections under $2,500 construction cost may be waived at the inspecting authority's discretion.
    • Building permit and enforcement fees may be levied by the local governing body.
    • Farm buildings and structures are exempt from the Building Code except for a farm building or portion operated as a licensed restaurant; farm buildings in flood plains or mudslide-prone areas remain subject to applicable flood-proofing or mudslide regulations.

    small-town population threshold: < 3500 people (The town may elect to administer and enforce the Building Code; otherwise the county administers it for the town.) · inspection-waiver construction cost threshold: < 2500 USD (The inspecting authority may waive inspection at its discretion.)

    “Enforcement of the provisions of the Building Code for construction and rehabilitation shall be the responsibility of the local building department. [...] Whenever a county or a municipality does not have such a building department or board of Building Code appeals, the local governing body shall enter into an agreement with the local governing body of another county or municipality or with some other agency, or a state agency approved by the Department for such enforcement and appeals resulting therefrom.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Minimum dwelling size — Minimum floor area or dwelling size for residential dwellings in Fairfax County.
  • Minimum lot size — Minimum lot-size requirements in Fairfax County.
  • Lot coverage — Lot-coverage requirements in Fairfax County.
  • Building height — Building-height limits in Fairfax County.
  • Camping on your land — Temporary camping on private land in Fairfax County.
2 more unanswered
  • Tiny homes
  • Off-grid sanitation

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Fairfax County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Virginia’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt — no permit or water right

Household wells are exempt from the groundwater withdrawal permit even inside a Groundwater Management Area, but a private well in a GWMA must be registered with DEQ within 30 days (Va. Code 62.1-258); a permit is triggered only at 300,000 gal/month.

Limit: < 300,000 gal/month (no withdrawal permit)

Virginia DEQ — Ground Water Withdrawal Permitting ↗
  • Eastern Virginia Groundwater Management Areapartial of county

    DEQ has imposed mandatory withdrawal reductions on large Coastal Plain permittees because permitted demand exceeds sustainable aquifer yield (declining heads, land subsidence, saltwater-intrusion risk). Household wells (<300,000 gal/mo) are exempt but must be registered. The I-95-west counties (Fairfax, Chesterfield, Hanover, Henrico, Prince William, Spotsylvania, Stafford, Caroline) are included only east of I-95.

    Virginia DEQ / 9VAC25-600-20 ↗

Regulated-riparian state (large uses permitted). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Virginia state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Fairfax County, Virginia

Is Fairfax County a good place to live off-grid or homestead?

Fairfax County scores 36/100 on the Bolthole Index, a marginal county profile. Its strengths: a durable current and mid-century hazard profile and a stronger property-autonomy legal backdrop. Watch-outs: little seclusion — roughly 1,945,020 people within a 30-minute drive and higher long-term carry cost.

Do you need a building permit in Fairfax County, Virginia?

Fairfax County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Fairfax County Health Department (Virginia Department of Health). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Fairfax County?

Living in an RV on your own land in Fairfax County is prohibited: Use or occupancy of a recreational vehicle for human habitation on public property, streets, avenues, alleys, or other public right-of-way in Fairfax County. Exception: use or occupancy is allowed in a designated public campground, recreational park, or licensed mobile home park. Confirm with the county before relying on it.

How much does land cost in Fairfax County, Virginia?

Land in Fairfax County runs about $17,494 per acre, based on the latest county data.

What is the water situation in Fairfax County?

Fairfax County gets about 43.2" of rain a year, with severe drought in roughly 2.2% of years. On water rights, Fairfax County lies in the Eastern Virginia Groundwater Management Area — DEQ has imposed mandatory withdrawal reductions on large Coastal Plain permittees because permitted demand exceeds sustainable aquifer yield (declining heads, land subsidence, saltwater-intrusion risk). Household wells (<300,000 gal/mo) are exempt but must be registered. The I-95-west counties (Fairfax, Chesterfield, Hanover, Henrico, Prince William, Spotsylvania, Stafford, Caroline) are included only east of I-95..

How remote is Fairfax County?

A representative private-land location has about 1,945,020 people within a 30-minute drive and 11,723,126 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Fairfax compares in Virginia

Compare side-by-side →See all 133 Virginia counties ranked →