Bolthole Index

Johnston County, North Carolina

Building permits, zoning and septic rules in Johnston County, North Carolina

49Index Score / 100
#88 of 100 in North Carolina

Unincorporated Johnston County, North Carolina requires building permits for most construction through County Building Inspections1. Johnston County has countywide zoning; municipal zoning can apply inside town limits or extraterritorial jurisdictions, and a proposed use may require rezoning2. The county serves most municipalities for building inspections, while some towns handle their own building permits3. Johnston County Environmental Health handles septic and private-well permitting throughout the county45.

At a glance

Building permit
Required for most construction in areas served by County Building Inspections; listed minor work is exempt1
Zoning
Countywide zoning is present; municipal zoning may apply, and a use change may require rezoning2
Septic permit
Required through Johnston County Environmental Health46
Private well
A county permit is required for a private well serving the project5
Owner-builder
Allowed with ownership, affidavit, supervision, inspection and occupancy conditions78
RV living
A private-land occupancy rule could not be confirmed; ask Planning and Zoning9
Single-wide home
A newly created lot must be at least 1 acre10

Who to call

Building permits

Johnston County Building Inspections

Building-permit applications, plan review and inspections in the county's jurisdiction

919-989-5060

inspections@johnstonnc.gov

309 E. Market Street, Smithfield, NC 27577

Planning & zoning

Johnston County Planning and Zoning

Land-use and zoning permits, zoning questions, and floodplain review

(919) 989-5150

planning@johnstonnc.gov

309 E. Market Street, Smithfield, NC 27577

Septic permits

Johnston County Environmental Health Department

Septic-system and private-well permitting, site evaluation and inspections

(919) 989-5180

envhealth@johnstonnc.gov

309 E. Market Street, Smithfield, NC 27577

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

Going off-grid in Johnston County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Johnston County, North Carolina?

Johnston County requires building permits for additions and remodels, finished attics, certain accessory structures, mobile homes, decks and porches, certain pools and spas, retaining walls, HVAC changes, electrical repairs, structural roof replacement, county-water hookups and demolition in areas served by County Building Inspections1. Cosmetic work, certain nonstructural door and window replacements, fences, and minor plumbing or electrical repairs by licensed contractors without system changes are listed as exempt1. Ask Johnston County Building Inspections about a project not covered by those examples11. North Carolina also has a narrow exception for qualifying work costing $40,000 or less, but the exception excludes specified structural, plumbing-design, HVAC, electrical, roofing-addition and Fire Code work12.

Who issues building permits in Johnston County, and how do you reach them?

Johnston County Building Inspections issues building permits and conducts code inspections in unincorporated areas and most municipalities; some towns handle their own building permits and inspections133. Smithfield requires town zoning approval before county-issued building permits; Selma requires town zoning approval with building-permit applications and directs applicants to County Building Inspections1415. Johnston County Environmental Health handles septic and private-well permits throughout the county45. Submit zoning approval, well/septic permits or utility approval, construction drawings and a detailed site plan; ask Building Inspections which lien document your project requires1617. Simple trade-permit applications may be emailed; other building applications must be delivered or mailed to the office16. Complete submissions generally take about 2.5 weeks for site-plan and construction-plan approval16. Contact County Building Inspections at 919-989-5060, inspections@johnstonnc.gov, or 309 E. Market Street in Smithfield18.

Does Johnston County have zoning?

Johnston County has countywide zoning, and every parcel has a zoning designation with allowable uses19. A proposed use that does not match the parcel's allowed uses may require rezoning before development or construction2. Most of Johnston County is Agricultural-Residential (AR); AR allows houses, while some other uses require a special-use permit2021. Check MapClick GIS and confirm the parcel's district with Planning and Zoning, including IHI and Municipal Transition overlays that add rules in certain areas2022. County zoning applies under county planning authority; town zoning may apply within municipal limits or extraterritorial jurisdictions23. Smithfield, Selma and Archer Lodge administer their own zoning; septic and private-well permits remain with Johnston County Environmental Health24252645. A county Land Use Permit reviews setbacks, floodplain, zoning, proposed use and the site address before other permitting agencies9.

How do septic and well permits work in Johnston County?

Johnston County Environmental Health administers septic and private-well permitting45. The septic application requires the appropriate planning or zoning document, a site plan, property evaluation, applicable survey or plat review, the zoning permit and fees6. Environmental Health inspects a septic system when installed, and systems using an effluent pump receive recurring inspections every five years27. Only about 38% of Johnston County soils are rated without severe limitations for a conventional drain field, making a parcel evaluation more useful than acreage alone28. Contact Environmental Health at (919) 989-5180 or envhealth@johnstonnc.gov29.

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

We could not confirm a current Johnston County rule that directly answers long-term RV occupancy or temporary camping on private land; ask Planning and Zoning before buying or placing an RV9. North Carolina does not accept a recreational park trailer as a permanent dwelling unless the unit is also built and labeled as a qualifying modular or HUD manufactured home30. North Carolina accepts qualifying tiny homes as permanent dwellings, subject to building approval, compliant construction and local zoning; we could not confirm Johnston County's specific tiny-home land-use treatment, so ask Planning and Zoning about the proposed unit and parcel319. We could not confirm a countywide minimum dwelling size; ask Planning and Zoning for the parcel's district requirements9. A newly created lot for a single-wide mobile home must contain at least 1 acre10.

What are the steps to build a home in Johnston County?

  1. Confirm whether county or municipal zoning controls the parcel, then verify the proposed home is allowed32.
  2. Obtain the county Land Use Permit or municipal zoning approval, including the applicable setback and floodplain review933.
  3. Obtain the driveway access permit through the North Carolina Department of Transportation34.
  4. Apply to Johnston County Environmental Health for private-well and septic permits when public services will not serve the lot56.
  5. Submit the building-permit application and required plans to County Building Inspections, or the municipal building office where the town issues building permits173.
  6. Complete building and septic inspections and obtain the required certificate before occupancy3527.

What should you check before buying land in Johnston County?

Confirm the parcel's zoning designation, jurisdiction, allowable use and location-specific setbacks before relying on a seller's description202333. Ask Environmental Health to assess septic feasibility because only about 38% of county soils are rated without severe limitations for a conventional drain field2829. Floodplain construction must meet additional building-code conditions, so ask Planning and Zoning whether the site needs floodplain review369. Confirm public water and sewer availability, driveway access, and any land-division standards373438. Planning's published fee schedule lists a $50 land-use permit for a new single-family dwelling or mobile home, but verify the current charge before applying39.

Watch-outs

  • A Johnston County parcel's zoning designation limits allowable uses; rezoning may be needed before developing a use the district does not allow2.
  • Municipal zoning approval does not necessarily mean municipal building permits: Archer Lodge sets zoning, but Johnston County issues building permits and Environmental Health handles septic and private-well permits there2640415.
  • A newly created lot for a single-wide mobile home must be at least 1 acre10.
  • We could not confirm a countywide private-land RV occupancy rule; ask Johnston County Planning and Zoning before treating an RV as housing9.

Sources

  1. When and Why Building Permits are Required, quoted and re-checked
  2. Zoning and Rezoning Information, quoted and re-checked
  3. Where to Get Building Permits by Town, quoted and re-checked
  4. On-Site Wastewater (Septic Systems), quoted and re-checked
  5. Building Permit Requirements, quoted and re-checked
  6. On-Site Wastewater (Septic Systems), quoted and re-checked
  7. johnstonnc.gov, quoted and re-checked
  8. G.S. 87-1. "General contractor" defined; exceptions. (North Carolina statewide rule), quoted and re-checked
  9. Johnston County Planning and Zoning (johnstonnc.gov)
  10. Subdivision Approval Process, quoted and re-checked
  11. When and Why Building Permits are Required, quoted and re-checked
  12. G.S. 160D-1110. Building permits. (North Carolina statewide rule), quoted and re-checked
  13. Building Codes, quoted and re-checked
  14. Town of Smithfield: Planning Department FAQs (Johnston County), quoted and re-checked
  15. Town of Selma: Permits - Town of Selma (Johnston County), quoted and re-checked
  16. Building Permit Requirements, quoted and re-checked
  17. Frequently Asked Questions, quoted and re-checked
  18. Johnston County Building Inspections (johnstonnc.gov)
  19. Zoning and Rezoning Information, quoted and re-checked
  20. Zoning and Rezoning Information, quoted and re-checked
  21. Zoning Definitions, quoted and re-checked
  22. Zoning and Rezoning Information, quoted and re-checked
  23. Zoning and Rezoning Information, quoted and re-checked
  24. Town of Smithfield: Planning and Development — Unified Development Ordinance (Johnston County), quoted and re-checked
  25. Town of Selma: Unified Development Ordinance - Town of Selma (Johnston County), quoted and re-checked
  26. Town of Archer Lodge: Planning and Zoning (Johnston County), quoted and re-checked
  27. On-Site Wastewater (Septic Systems), quoted and re-checked
  28. 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
  29. Johnston County Environmental Health Department (johnstonnc.gov)
  30. RV Park Design Guidance (North Carolina statewide rule), quoted and re-checked
  31. Guidelines for Tiny Homes in North Carolina (North Carolina statewide rule), quoted and re-checked
  32. Zoning Definitions, quoted and re-checked
  33. johnstonnc.gov, quoted and re-checked
  34. When and Why Building Permits are Required, quoted and re-checked
  35. How to Call for an Inspection, quoted and re-checked
  36. johnstonnc.gov, quoted and re-checked
  37. Building Permit Requirements, quoted and re-checked
  38. Subdivision Approval Process, quoted and re-checked
  39. Johnston County Planning and Zoning Fee Schedule, quoted and re-checked
  40. Town of Archer Lodge: Development Permitting Process (Johnston County), quoted and re-checked
  41. Town of Archer Lodge: Development Permitting Process (Johnston County), quoted and re-checked

Written October 11, 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, Johnston County requires a building permit for a home.

RuleJohnston CountyWake CountyWayne CountyHarnett CountyWilson CountyFranklin CountyNash County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Env. Health Dept.County Onsite Water Protection Div.Not publishedCounty Health Dept.County Health Dept.County Env. HealthCounty Env. Health

County locator

Johnston County in North Carolina

49
County map
Johnston County highlighted among the North Carolina counties · colored by Index score

How Johnston County scores

Seclusion18100% ev.
Self-Sufficiency79100% ev.
Admin Boringness4290% ev.
Durability77100% ev.
Property Autonomy42100% ev.
Carry Cost72100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$345kTypical home
0.7%Property tax
$6,813Land / acre
48.9"Annual rain
1.6% of yrsSevere drought
9.5 / yr (+8.5)Mid-century 100°F days
13.2 daysMid-century dry spell
2.09" (+5.3%)Mid-century 1-day rain
1.3×Wildfire change factor
100%Forward climate coverage
$1,330Home insurance / yr
1.8% / yrInsurance growth
2.21%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
266,415People within 30 min
6,011,004People within 2 hr
205,297Radius comparison (15 mi)
305.5People / sq mi
0%Federal land
97.5%Land at 15% slope or less
37.6%Soils rated "not limited" for septic (strict USDA rating)
188,980 acWorkable land screen
57.5%Wooded land
51.5 tonsBiomass / forest ac
61.1°FAvg temp

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Cities and towns in Johnston 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 Benson · Town of Micro · Town of Pine Level · Town of Princeton · Town of Wilson's Mills

Answers from the rulebook for Johnston County

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

Johnston County rules

  • Building permitRequired

    Building construction and listed alterations in Johnston County areas served by County Building Inspections.

    • Examples requiring permits include additions/remodels, attic finishing, certain accessory structures, new or replacement mobile homes, decks and porches, certain pools and spas, retaining walls, HVAC changes, electrical repairs, structural roof replacement, county-water hookups, and demolition.
    • Cosmetic work, non-structural door and window replacement, minor plumbing/electrical repairs by licensed contractors without system changes, and fences are listed as not requiring permits.
    • Municipalities may administer permits within their own jurisdictions.
    “The above listed projects are examples of required permits”
    One more reviewed finding on this topic
    • Required — Examples include additions/remodels, finishing attic space, larger accessory structures, mobile homes, decks and porches, pools over 24 inches, retaining walls, HVAC changes, electrical repairs, structural roof changes, county-water hookups, and demolition.
      “The above listed projects are examples of required permits, you will need to contact our office for specific projects not listed.”
  • Owner-builder exemptionAvailable (with conditions)

    An owner acting as the contractor for the owner's building project.

    • The owner must own the property and occupy the building for at least 12 consecutive months after the final inspection and after the Certificate of Occupancy has been issued.

    required occupancy period: 12 months (must be consecutive and follow final inspection and Certificate of Occupancy issuance)

    “An owner can act as their own contractor”
  • Building code adoptedAdopted (with conditions)

    Building-code administration for construction subject to Johnston County Building Inspections.

    • The county page identifies current adopted building codes and links to North Carolina code materials.
    • Most municipalities rely on Johnston County Building Inspections, but Clayton and Four Oaks issue their own building permits and conduct their own inspections inside their town limits.
    “In Johnston County, North Carolina, the majority of municipalities do not have their own building inspections departments. Instead, they rely on the Johnston County Building Inspections Department to issue building permits and conduct building code inspections.”
  • InspectionsLimited

    Construction in the majority of Johnston County municipalities and unincorporated county areas served by County Building Inspections.

    • Clayton and Four Oaks are identified as municipalities that issue their own building permits and handle their own construction inspections within their town limits.
    • Required inspections include footing, foundation, framing, insulation, septic/sewer tie-in, water-line/plumbing underground, conditional utilities, and final inspections.
    “There are two municipalities in the county that do issue their own building permits and handle their own construction inspections”
  • Certificate of occupancyRequired

    Residences inspected by Johnston County Building Inspections.

    • All inspections must be approved and final water and sewer approval from Environmental Health must be in the file before a Certificate of Occupancy can be given.
    • Municipal inspection authorities may apply inside Clayton and Four Oaks.
    “before a Certificate of Occupancy can be given on any residence, all inspections must be approved”
  • County-wide zoningPresent (with conditions)

    Johnston County zoning ordinance and parcel zoning designations.

    • A rezoning may be required before development or construction when the property's zoning designation and permitted uses do not coincide with the desired use.
    • Municipal zoning may apply within incorporated municipalities or extraterritorial jurisdictions.
    “Johnston County adopted a county-wide zoning ordinance 1992. Every parcel of land has a specific zoning designation which carries certain allowable uses.”
    One more reviewed finding on this topic
    • Present (with conditions) — Johnston County zoning ordinance and parcel zoning designations.
      “Johnston County adopted a county-wide zoning ordinance 1992. Every parcel of land has a specific zoning designation which carries certain allowable uses.”
  • Local zoningVaries (with conditions)

    Aggregate of Johnston County and municipal zoning within the county; the county does not administer each municipality's zoning code.

    • The County and each municipality maintain their own zoning codes.
    • Municipality-specific rules must be confirmed with the relevant municipality.
    “The County and each municipality maintain their own zoning codes.”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning regulation across Johnston County; incorporated municipalities may administer separate local zoning and land-use approvals.
      “If the property is located within the city limits or within the town's extraterritorial jurisdiction, then the zoning permit would need to be obtained from the Town's Planning Office.”
  • Zoning districtsPublished

    County zoning districts and associated overlay zoning in Johnston County, North Carolina.

    • The county GIS page advises checking with the Johnston County Planning Department to ensure parcel-level zoning reflects the most recent data.
    • To see county zoning in its entirety, the source instructs users to also download Zoning - IHI Districts and Zoning - Municipal Transition Districts.
    • The IHI and Municipal Transition Districts files contain overlay zoning that adds additional rules to certain zoned areas.
    • Municipal zoning is separately represented in the county GIS data and is not treated as county-administered zoning in this claim.
    “Zoning - County | 3.3MB | This file shows the zoning districts in Johnston County.”
    2 more reviewed findings on this topic
    • Published — Johnston County zoning districts and general district definitions.
      “AR: Agricultural and Residential. This includes houses, churches, etc. With a special use permit, uses can include kennels, day cares, community centers, etc. RR: Resort/Residential. Campgrounds, stables, marinas, etc.”
    • Published (with conditions) — County zoning designations and allowable-use rules in Johnston County planning jurisdiction.
      “Johnston County adopted a county-wide zoning ordinance 1992. Every parcel of land has a specific zoning designation which carries certain allowable uses.”
  • SetbacksDistrict specific (with conditions)

    Structure setbacks in Johnston County, where the applicable setback depends on the property's location and street.

    • The county does not provide numeric setback measurements on the opened FAQ page.
    • The county directs applicants to the Building Setbacks document and Planning Department.
    “Setbacks are based on location/street where the property is located.”
  • Manufactured homesLimited

    Single-wide mobile/manufactured homes on lots subject to Johnston County land-development rules.

    • Lots created for single-wide mobile homes may not be permitted for lots less than 1 acre.
    • The county FAQ states that a single-wide mobile home is the only structure requiring one acre.
    • New or replacement mobile homes require a building permit.

    minimum lot size: >= 1 acre

    “Lots created for single-wide mobile homes may not be permitted for lots less than 1 acre.”
  • Who permits septicCounty (with conditions)

    On-site wastewater systems in Johnston County.

    • North Carolina rules are referenced for system responsibilities and pump inspections.
    “Environmental Health has several responsibilities”
  • Septic permitRequired

    New and existing-lot septic permitting in Johnston County.

    • The application requires a planning/zoning document, site plan, property evaluation, applicable survey or plat review, zoning permit, and fees.
    • The permit may be released upon receipt of the proper zoning permit and other fees.
    “Issuing or denying a permit based on the results of the lot evaluation.”
  • Septic inspectionRequired

    Septic systems installed in Johnston County and systems utilizing an effluent pump.

    • Installed systems are inspected to ensure proper installation.
    • Effluent-pump systems are inspected every five years under 15A NCAC 18E .1365.

    effluent-pump inspection interval: 5 years

    “Inspecting septic systems when they are installed”
  • Well permitRequired

    Private wells associated with new and existing lots in Johnston County.

    • Building permit applications require a copy of well and septic tank permits for new and existing lots.
    • A completed well log must be on file for water and sewer authorization.
    • A negative bacteriological water test is required to approve the well.
    “Copy of the Well and Septic Tank Permits for New and Existing Lots”
  • Mandatory utility hookupConditional

    Water and sewer approvals for building permits and final occupancy.

    • Town water and sewer requires written town approval for hookup.
    • Public water and sewer requires approval from Johnston County Public Utilities.
    • Final water and sewer approval is required before a residential Certificate of Occupancy.
    “the Town needs to supply written approval for hookup.”
  • Subdividing landRegulated (with conditions)

    Residential subdivision and division of land in Johnston County.

    • Residential division requires at least 1.33 acres with public water or 2 acres without a public water source.
    • Residential density may not exceed 1.5 housing units per acre with public water or 1 unit per acre with well water.
    • Single-wide mobile-home lots may not be permitted below 1 acre.
    • Minor subdivisions create three or fewer lots from a tract created before September 2000.
    • Fees are subject to change under the annual fee schedule.

    minimum land with public water: >= 1.33 acres (residential division) · minimum land without public water: >= 2 acres (residential division) · maximum density with public water: <= 1.5 housing units per acre · maximum density with well water: <= 1 housing unit per acre

    “Planning Staff will review the development proposals for conformance with local development regulations.”
  • Driveway accessRequired

    Driveway access permits for development in Johnston County.

    • The reviewed county page directs applicants to the North Carolina Department of Transportation for driveway permits.
    “Driveway permits are obtained at Department of Transportation 919.934.6176”
  • Building in a floodplainLimited

    Development and construction in floodplain areas of Johnston County.

    • Johnston County participates in FEMA and FIRM programs.
    • The county states that building in the floodplain requires compliance with certain building codes.
    • The county directs applicants to the Flood Plain Administrator for more information.

    annual flood probability: 1 percent

    “there are certain building codes that must be met”
  • Permit feesPublished (with conditions)

    Johnston County Planning and Zoning fees.

    • The schedule states it was adopted June 17, 2024 and effective September 1, 2024.
    • The page states the open-space fee-in-lieu was revised July 1, 2026.
    • Fees are subject to the listed categories and may change through later fee schedules.

    new single family dwelling land use permit: 50 USD · mobile home land use permit: 50 USD · minor subdivision review 1-3 lots: 250 USD · open-space fee-in-lieu: per 1200 USD per lot

    “Adopted June 17, 2024, Effective September 1, 2024 [...] New Single Family Dwelling: $50.00 Mobile Home: $50.00 [...] 1-3 Lots (minor): $250.00 [...] Fee-in-Lieu: $1200.00/lot”
  • Permit processPublished (with conditions)

    County building-permit application and review process.

    • Applications require a completed application, construction drawings, site plan, septic permit, county water receipt if applicable, and lien agent where applicable.
    • Simple trade permits may be emailed; other applications must be brought to or mailed to the office.
    • Online application was not available on the reviewed FAQ page.
    • Site Plan and Construction Plan approval takes about two and a half weeks after a complete submission, subject to reviewer questions or requests for additional information.

    typical site-plan and construction-plan approval time: 2.5 weeks (after receipt of completed application and necessary documents)

    “it takes about two and a half weeks for Site Plan and Construction Plan approval.”
    One more reviewed finding on this topic
    • Partial — Building permit applications and county planning/environmental-health approvals.
      “Once we have received a completed permit application, and all the necessary documents, it takes about two and a half weeks for Site Plan and Construction Plan approval.”

North Carolina rules that apply here

  • Tiny homesAllowed (with conditions)

    Tiny homes intended for use as permanent single-family dwellings in North Carolina.

    • The tiny home must be permitted by the local building official having jurisdiction over the building site.
    • The unit must be of open construction for inspection, unless off-site closed construction is inspected and certified under the North Carolina Modular Construction Program.
    • Applicable local zoning and setback requirements must be met.
    • Applicable community protective covenant requirements must be met.
    • The unit and foundation must comply with the North Carolina State Residential Code, 2018 Edition, Section 101.3.2.10 of the North Carolina Administrative Code.
    • Habitable rooms must have at least 70 square feet, except kitchens, and must be at least 7 feet in every horizontal dimension.
    • Ceilings must be at least 7 feet in habitable spaces, hallways, bathrooms, and toilet rooms.
    • The dwelling unit must have toilet facilities, a kitchen area with a sink, approved sewer or private sewage disposal, heating, compliant means of egress, and energy conservation compliance.
    • If constructed through the NC Modular Construction Program, additional modular-home design and foundation standards apply.
    • If constructed through the HUD Manufactured Housing Construction Program, the unit must contain at least 320 square feet when erected.
    • Units manufactured and certified by the Recreational Vehicle Industry Association are recreational vehicles and should be treated as such.

    minimum habitable room area: >= 70 square feet (Kitchens) · minimum habitable room dimension: >= 7 feet · minimum HUD-program floor area when erected: >= 320 square feet (Applies if constructed through the HUD Manufactured Housing Construction Program)

    “Tiny Homes are acceptable as permanent single-family dwellings in North Carolina provided they meet the following minimum requirements.”
  • Accessory dwellingsLimited

    Accessory dwelling units in cities with a population of 50,000 or greater that are not in the coastal area, in areas zoned for residential use that allow single-family detached dwellings.

    • The requirement applies only to cities with a population of 50,000 or greater that are not in the coastal area.
    • The subsection requiring local governments to allow the ADU becomes effective January 15, 2027 and applies to applications for ADU permits on or after that date.
    • Local governments must adopt implementing development regulations by July 1, 2027; if they fail to do so, ADUs must be allowed without limitations.
    • The ADU must conform to the North Carolina Residential Code, including applicable fire-prevention-code provisions.
    • The primary dwelling and ADU may be used for long-term rentals by separate households.
    • A local government may not require conditional zoning, impose minimum parking requirements or other parking restrictions, prohibit connection to existing utility systems when the primary dwelling has capacity to serve both dwellings, charge fees exceeding those for a similar single-family dwelling permit, or set a maximum ADU size below 800 square feet or above 1,000 square feet.
    • A local government may impose a setback of 10 feet or the generally applicable setback for the same zoning classification, whichever is less; require side or rear placement; and require the ADU to be smaller than the primary dwelling.
    • The provision does not apply to private covenants or contractual dwelling-type restrictions, historic preservation districts, National Historic Landmarks, or ADUs not connected to water, well and septic, and sewer.
    • After permitting, the parcel may not be subdivided so that the ADU and primary dwelling are on different parcels.

    minimum maximum accessory dwelling unit size: 800-1000 square feet (A local government may not set a maximum size below 800 square feet or above 1,000 square feet.) · implementation deadline: July 1, 2027 (If the local government fails to adopt regulations by this date, ADUs must be allowed without limitations.)

    “This section applies only to cities with a population of 50,000 or greater, that are not in the coastal area, as that term is defined in G.S. 113A‑103.”
  • Off-grid sanitationLimited

    Chemical and portable toilets and other sanitation arrangements used instead of or alongside permanent wastewater treatment systems.

    • A chemical or portable toilet may be placed where it can be operated and maintained under sanitary conditions.
    • It may not replace or substitute for a water closet or urinal connected to a permanent wastewater treatment system where the North Carolina State Building Code requires that permanent connection.
    • It may supplement a water closet or urinal during periods of peak use.
    • It may not be used as an alternative to repair of a water closet, urinal, or wastewater treatment system.
    • Human waste may be discharged only into a wastewater system approved by the Department under Commission or Environmental Management Commission rules, or at a site permitted under G.S. 130A-291.1.
    “A chemical or portable toilet shall not be used as an alternative to the repair of a water closet, urinal, or wastewater treatment system.”
  • Agricultural exemptionAvailable (with conditions)

    Qualifying nonresidential farm buildings, primitive camps, and primitive farm buildings under North Carolina building rules.

    • Building rules do not apply to farm buildings outside the building-rules jurisdiction of any municipality.
    • Inside a municipality's building-rules jurisdiction, the exemption applies to greenhouses and therapeutic equine facilities.
    • The exemption also applies to primitive camps and primitive farm buildings.
    • A farm building means a nonresidential building or structure used for a bona fide farm purpose under G.S. 160D-903(a).
    • Qualifying farm buildings remain subject to specified annual safety inspections for grandstands, bleachers, or other spectator-seating structures.
    • A produce display and sale structure must be no more than 1,000 square feet, open to the public no more than 180 days per year, and certified as a Certified Roadside Farm Market.
    • Certain agricultural storage buildings must be surrounded and adjoined by public ways and yards at least 60 feet wide and must display the required Ag. Exempt placard.

    maximum produce-market area: <= 1000 square feet (Structure must also be open to the public no more than 180 days per year and certified by the Department of Agriculture and Consumer Services as a Certified Roadside Farm Market.) · minimum surrounding public ways and yards: >= 60 feet (Applies to qualifying agricultural storage buildings; required Ag. Exempt placard must also be posted.)

    “Building rules do not apply to (i) farm buildings that are located outside the building-rules jurisdiction of any municipality,”
    One more reviewed finding on this topic
    • Available (with conditions) — Bona fide farm property subject to county zoning, and qualifying bona fide farm property in a city's extraterritorial planning and development regulation jurisdiction.
      “County zoning regulations may not affect property used for bona fide farm purposes;”
  • Campground & park staysLimited

    Camping and habitation within the boundaries of North Carolina Coastal Reserve components.

    • Camping and habitation are prohibited on Reserve uplands and wetlands except on the uplands at Masonboro Island Reserve.
    • Masonboro Island camping is limited to no more than two consecutive nights.
    • The rule applies to the Reserve components identified in 15A NCAC 07O .0105.

    maximum camping duration at Masonboro Island Reserve: <= 2 consecutive nights (Applies only on the uplands at Masonboro Island Reserve.)

    “Camping or any form of habitation on the uplands or wetlands of the Reserve is prohibited except on the uplands at the Masonboro Island Reserve, where camping is allowed for no more than two consecutive nights.”
    One more reviewed finding on this topic
    • Limited — Permanent dwelling use of recreational park trailers or park model trailers in North Carolina RV parks.
      “Recreational Park Trailer – Permanent Installation: Recreational Park Trailers “cannot be accepted as a permanent dwelling structure in North Carolina” unless the units are dual labeled and “also constructed and labeled under either the NC Modular Construction Program as a single-family modular dwelling or under the Federal Manufactured Housing Construction and Safety Standards as a single family (HUD) manufactured home.””
  • county zoning authorityGeneral

    North Carolina counties adopting zoning or subdivision regulations in their county planning and development regulation jurisdiction, including unincorporated areas not subject to municipal planning and development regulation jurisdiction.

    • County powers under Chapter 160D may be exercised throughout the county except in areas subject to municipal planning and development regulation jurisdiction.
    • A county may apply zoning or subdivision regulations to all or part of its county planning and development regulation jurisdiction.
    • The local government's planning and development regulation jurisdiction does not include an area ceded pursuant to an agreement under G.S. 160D-203.
    “(b) Counties. - All of the powers granted by this Chapter may be exercised by any county throughout the county except in areas subject to municipal planning and development regulation jurisdiction. (c) Partial Jurisdiction Regulation in Cities and Counties. - If a city elects to adopt zoning or subdivision regulations, each must be applied to the city's entire planning and development regulation jurisdiction. If a county elects to adopt zoning or subdivision regulations, each may be applied to all or part of the county's planning and development regulation jurisdiction.”
  • county building authorityLimited

    County building-permit requirements and local building-related codes for residential construction in North Carolina, including unincorporated areas.

    • The North Carolina State Building Code applies throughout the State from the time of adoption.
    • Any political subdivision, including a county, may adopt a fire prevention code and floodplain management regulations within its jurisdiction.
    • Local fire-prevention-code provisions may not apply to dwellings subject to the North Carolina Residential Code unless they are prescriptively required by that Code.
    • County jurisdiction for the State Building Code includes all other areas of the county after municipal corporate limits and qualifying extraterritorial jurisdiction are excluded.
    • Local codes or regulations, other than floodplain management regulations and regulations permitted by G.S. 160D-1128, require official approval by the responsible Code Council before becoming effective.
    • Construction, reconstruction, alteration, repair, movement, removal, or demolition of a building or structure generally requires permits before work begins, subject to the statutory exceptions in G.S. 160D-1110(c) and G.S. 160D-1110.1(h).
    “(e) Effect upon Local Codes. - Except as otherwise provided in this section, the North Carolina State Building Code shall apply throughout the State, from the time of its adoption. Approved rules shall become effective in accordance with G.S. 150B-21.3. However, any political subdivision of the State may adopt a fire prevention code and floodplain management regulations within its jurisdiction. Provided a political subdivision shall not adopt local fire prevention code provisions which apply to dwellings subject to the North Carolina Residential Code which are not prescriptively required by the North Carolina Residential Code. The territorial jurisdiction of any municipality or county for this purpose, unless otherwise specified by the General Assembly, shall be as follows: Municipal jurisdiction shall include all areas within the corporate limits of the municipality and extraterritorial jurisdiction areas established as provided in G.S. 160D-202 or a local act; county jurisdiction shall include all other areas of the county.”
    One more reviewed finding on this topic
    • General — North Carolina statutory authority for counties to administer building-code inspections and require permits for residential construction in county planning and development regulation jurisdiction, including unincorporated areas outside municipal jurisdiction.
      “The duties and responsibilities set forth in subsection (a) of this section include the receipt of applications for permits and the issuance or denial of permits, the making of any necessary inspections in a timely manner, the issuance or denial of certificates of compliance, the issuance of orders to correct violations, the bringing of judicial actions against actual or threatened violations, the keeping of adequate records, and any other actions that may be required in order adequately to enforce those laws.”

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 minimum dwelling size for residential dwellings in Johnston County.
  • Minimum lot size — Minimum lot size requirements outside the specific subdivision land-division standards.
  • Lot coverage — Lot coverage or impervious-surface limits in Johnston County.
  • Building height — Building-height limits in Johnston County.
  • Living in an RV — Residential or long-term occupancy of recreational vehicles on private land in Johnston County.
2 more unanswered
  • Camping on your land
  • Short-term rentals

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.

Living off-grid in Johnston County, North Carolina

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

Johnston County scores 49/100 on the Bolthole Index, a solid county profile. Its strengths: strong self-sufficiency basics: 48.9″/yr rainfall plus 57.5% wooded land and mixed durability signals. Watch-outs: about 266,415 people within a 30-minute drive and more administrative friction around building and land use.

Do you need a building permit in Johnston County, North Carolina?

Johnston County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Johnston County Environmental Health Department. 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.

How much does land cost in Johnston County, North Carolina?

Land in Johnston County runs about $6,813 per acre, based on the latest county data.

What is the water situation in Johnston County?

Johnston County gets about 48.9" of rain a year, with severe drought in roughly 1.6% of years.

How remote is Johnston County?

A representative private-land location has about 266,415 people within a 30-minute drive and 6,011,004 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 Johnston compares in North Carolina

Compare side-by-side →See all 100 North Carolina counties ranked →