Bolthole Index

Mercer County, West Virginia

Building permits, zoning and land rules in Mercer County, West Virginia

68Index Score / 100
#10 of 55 in West Virginia

Unincorporated Mercer County, West Virginia generally does not require a county building permit for an ordinary home outside a mapped flood hazard area, and the county has no countywide zoning12. Flood-hazard development does require county review, while septic systems and water wells go through the Mercer County Health Department345.

At a glance

Building permit
Generally not required for an ordinary home outside mapped flood hazard areas1
Zoning
No countywide zoning; municipal rules may still apply inside a town2
Septic
Permitted through the Mercer County Health Department46
Owner-builder
Personal work by an owner or occupant is exempt from contractor licensure7
Floodplain building
County permit review, inspections and a certificate of compliance may apply83
Water well
A county health department permit and site approval are required5
State-highway driveway
A free Division of Highways permit is required9

Who to call

Health department

Mercer County Health Department

Onsite sewage and septic permits, site evaluations and inspections, and water well permits for Mercer County

(304) 324-8367

978 Blue Prince Rd, Bluefield, WV 24701

Online permits →

Floodplain permits

Mercer County Office of Floodplain Management

Floodplain determinations, development permits, inspections and certificates of compliance

304-487-8306

1501 West Main Street, Princeton, WV 24740

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Mercer County, West Virginia?

An ordinary home in unincorporated Mercer County generally needs no county building permit outside a mapped flood hazard area because the county's ordinance list shows no adopted building code and West Virginia building-code requirements apply where a county or municipality adopts the state code110. Mercer County's overall building-code adoption status could not be confirmed in a direct county statement, so ask the County Commission before relying on that answer for an unusual project. Flood-hazard land is different: county officials may inspect construction, and a certificate of compliance is required before occupancy or a permanent utility connection8311. Structures used primarily for agriculture are exempt from the State Building Code and any adopted county or municipal building code10.

Who issues building and land permits in Mercer County?

Mercer County does not have countywide zoning, and we could not confirm a general county building department for ordinary residential construction outside flood-hazard areas21. For a parcel in a mapped flood hazard area, contact the Mercer County Office of Floodplain Management in Princeton about the determination, permit, inspections and certificate of compliance128. The floodplain determination fee is $20, while development-permit fees vary with the project and estimated construction value13. Contact the Mercer County Health Department in Bluefield for onsite sewage and water-well permits645. A new driveway connecting to a state highway needs a free permit from the West Virginia Division of Highways, not a county permit9.

Does Mercer County have zoning?

Mercer County does not have countywide zoning, and the County Commission has stated that Mercer County has no zoning laws2. That answer covers county-administered zoning; it does not establish the rules inside incorporated municipalities, which may regulate land through their own ordinances1415. No county rule was confirmed for tiny-home occupancy, minimum dwelling size, setbacks, building height or short-term rentals in unincorporated areas, so ask the County Commission about the parcel rather than treating silence as permission. Floodplain regulation still applies without zoning: development, placement or relocation of a structure in a regulated flood-hazard area can require a permit, site plan and certificate of compliance16. Mercer County's agricultural exclusion under its dilapidated-building ordinance is limited to that ordinance and is not a blanket exemption from health, floodplain or state requirements17.

How do septic and well permits work in Mercer County?

The Mercer County Health Department issues onsite sewage and septic permits, conducts site evaluations and performs inspections in Mercer County46. Contact that office before choosing a house site because only about 3.4 percent of county soils are rated without severe limitations for a conventional septic drain field18. That soil rating does not make a parcel unbuildable, but it makes early evaluation and room in the budget for an alternative or engineered design especially important. The same Health Department is the local permitting authority for constructing, modifying or abandoning a water well; site approval comes before permit issuance, and a certified well driller must perform the work5. We could not confirm a complete Mercer County rule for privies, holding tanks, composting toilets or other off-grid sanitation, so take a proposed alternative system directly to the Health Department before buying equipment or relying on it in a site plan.

Can you live in an RV or tiny home in Mercer County?

Mercer County's countywide rules for living in an RV or tiny home outside mapped flood-hazard areas could not be confirmed, so absence of countywide zoning should not be read as automatic approval2. Inside a regulated flood-hazard area, an RV used as temporary living quarters must satisfy the ordinance's construction provision, remain for fewer than 180 consecutive days, or stay fully licensed and ready for highway use; floodplain permitting still applies19. A manufactured home in a flood-hazard area requires a licensed West Virginia manufactured-home installer, a permanent anchored foundation and an engineered design with the lowest floor and utilities at least 2 feet above Base Flood Elevation20. Ask the County Commission about occupancy and parcel-specific restrictions, the Health Department about wastewater, and the relevant municipality if the property lies inside town limits414.

What steps should you follow to build in Mercer County?

  1. Ask the Mercer County Office of Floodplain Management whether the house site is in a regulated flood-hazard area; the determination fee is $201213.
  1. Confirm the permit path with the County Commission, especially because Mercer County's general building-code adoption status could not be confirmed beyond the ordinary-home guidance1.
  1. Apply early to the Mercer County Health Department for septic approval and any needed water-well permit645.
  1. If you will personally perform the work, document the owner-builder exemption from contractor licensure; that exemption does not waive applicable permits or inspections7.
  1. Obtain a free Division of Highways permit before building a driveway onto a state highway9.
  1. If land disturbance reaches 1 acre, or is part of a larger common plan, apply through the state environmental agency's electronic system for stormwater coverage21.

What should you check before buying land in Mercer County?

Start with septic suitability and terrain: only about 3.4 percent of Mercer County soils avoid severe conventional-drain-field limitations, only 24.3 percent of land has a slope of 15 percent or less, and about 87.4 percent is wooded182223. Check the flood map before pricing a house site, driveway or utility run because regulated flood-hazard development can require county permits, inspections and a certificate of compliance83. The nearest city of 100,000 or more people is about 101 miles from the county center, while Mercer County has roughly 58,057 residents and a density near 138.6 people per square mile242526. For carrying costs, the effective property-tax rate is about 0.5 percent and the median annual property-tax bill is about $5892728. Verify legal access and obtain the state permit if the driveway enters a state highway9.

Watch-outs

  • Mercer County's general building-code adoption status could not be confirmed in a direct county statement, so ask the County Commission before treating the ordinary-home permit answer as final for your project1.
  • No countywide rule was confirmed for tiny homes, minimum dwelling size, setbacks, building height or short-term rentals in unincorporated Mercer County; ask the County Commission about the parcel2.
  • A county floodplain determination costs $20, and starting permit-required work before approval doubles the applicable floodplain fees without excusing compliance13.

Sources

  1. Mercer County Commission Ordinances (2026 county census)
  2. January 2025 Meeting Minutes, quoted and re-checked
  3. Floodplain Ordinance - Mercer County Commission WV, quoted and re-checked
  4. Mercer County Health Department - Permits & Applications (2026 county census)
  5. Permits & Applications | Mercer County Health Department, quoted and re-checked
  6. Mercer County Health Department (mercercountyhealthwv.com)
  7. West Virginia Code §30-42-3. Definitions, quoted and re-checked
  8. Floodplain Ordinance - Mercer County Commission WV, quoted and re-checked
  9. Encroachment Permits, quoted and re-checked
  10. West Virginia Code §15A-11-5, Promulgation of rules and statewide building code (West Virginia statewide rule), quoted and re-checked
  11. Floodplain Ordinance - Mercer County Commission WV, quoted and re-checked
  12. Mercer County Office of Floodplain Management (mercercountywv.com)
  13. Floodplain Ordinance, quoted and re-checked
  14. January 2025 Meeting Minutes, quoted and re-checked
  15. West Virginia Code §8A-7-1. Authority for zoning ordinance (West Virginia statewide rule), quoted and re-checked
  16. Floodplain Ordinance, quoted and re-checked
  17. Abandoned and Dilapidated Building Ordinance, quoted and re-checked
  18. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  19. Floodplain Ordinance - Mercer County Commission WV, quoted and re-checked
  20. Floodplain Ordinance - Mercer County Commission WV, quoted and re-checked
  21. Construction Stormwater General Permit (West Virginia statewide rule), quoted and re-checked
  22. Share of land at 15% slope or less: Bolthole Index county data
  23. Wooded share of land: Bolthole Index county data
  24. Distance to the nearest metro area: Bolthole Index county data
  25. County population: Bolthole Index county data
  26. Population density: Bolthole Index county data
  27. Effective property tax rate: Bolthole Index county data
  28. Median property tax bill: Bolthole Index county data

Written September 28, 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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County locator

Mercer County in West Virginia

68
County map
Mercer County highlighted among the West Virginia counties · colored by Index score

How Mercer County scores

Seclusion55100% ev.
Self-Sufficiency54100% ev.
Admin Boringness88100% ev.
Durability80100% ev.
Property Autonomy26100% ev.
Carry Cost89100% 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 →

$154kTypical home
0.5%Property tax
$2,733Land / acre
42.1"Annual rain
0.9% of yrsSevere drought
0.2 / yr (+0.2)Mid-century 100°F days
11.3 daysMid-century dry spell
1.47" (+8.1%)Mid-century 1-day rain
1.71×Wildfire change factor
100%Forward climate coverage
$1,242Home insurance / yr
0% / yrInsurance growth
0.43%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
49,759People within 30 min
1,374,888People within 2 hr
60,673Radius comparison (15 mi)
138.6People / sq mi
0.1%Federal land
24.3%Land at 15% slope or less
3.4%Septic soil without severe limits
8,723 acWorkable land screen
87.4%Wooded land
70 tonsBiomass / forest ac
52.3°FAvg temp

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Answers from the rulebook for Mercer County

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

Mercer County rules

  • InspectionsLimited

    Development covered by the Mercer County Floodplain Ordinance.

    • During construction, the Floodplain Administrator or another authorized official may inspect the premises for compliance with the permit application and applicable laws and ordinances.
    • The Floodplain Administrator or authorized official may inspect development covered by the current or previous ordinance for later noncompliance.
    • The ordinance also states that certificate issuance is based on inspections prescribed by the ordinance or local administrative procedures.
    “During the construction period, the Floodplain Administrator or other authorized official may inspect the premises to determine that the work is progressing in compliance with the information provided on the permit application and with all applicable laws and ordinances.”
  • Certificate of occupancyLimited

    Occupancy or use of buildings and premises in areas of flood hazard regulated by the Mercer County Floodplain Ordinance.

    • A certificate of compliance must be issued by the Local Floodplain Administrator before occupancy or use.
    • Permanent utility connections require the certificate of compliance.
    • The certificate is issued after satisfactory completion of development in areas of special flood hazard.
    • Issuance is based on required inspections and any required finished construction elevation certificate, hydraulic data, flood-proofing certificate, or encroachment analyses.
    “In areas of flood hazard it shall be unlawful to occupy, or to permit the use or occupancy, of any building or premises, or both, or part thereof hereafter created, erected, installed, changed, converted or wholly or partly altered or enlarged in its use or structure until a certificate of compliance has been issued by the Local Floodplain Administrator stating that the building or land conforms to the requirements of this local law.”
  • County-wide zoningAbsent

    Countywide zoning laws administered by Mercer County.

    • The cited county meeting minutes do not address zoning administered by incorporated municipalities.
    • Floodplain regulation and other non-zoning ordinances may still apply.
    “Since Mercer County does not have zoning laws there is nothing the Mercer County Commission can do about it. They will need to contact the EPA or DEP in the future with their environmental concerns.”
  • Local zoningAbsent

    County-administered zoning in unincorporated Mercer County.

    • The source states that Mercer County does not have zoning laws.
    • This claim does not determine whether incorporated municipalities within Mercer County have their own zoning ordinances.
    • Floodplain regulation and other non-zoning ordinances may still apply.
    “Since Mercer County does not have zoning laws there is nothing the Mercer County Commission can do about it. They will need to contact the EPA or DEP in the future with their environmental concerns.”
  • Camping on your landLimited

    Temporary camping or temporary placement of recreational vehicles within Mercer County floodplain areas.

    • The RV must meet Section 6.1, remain on site fewer than 180 consecutive days, or be fully licensed and ready for highway use.
    • Ready-for-highway-use status requires wheels or jacking system, quick-disconnect utilities and security devices, and no permanently attached additions.
    • Floodplain development or placement requires a permit application and certificate of compliance.

    maximum site duration under the temporary-placement alternative: < 180 consecutive days (The ordinance also allows compliance with Section 6.1 or fully licensed and ready-for-highway-use status.)

    “temporary living quarters for recreational, camping, travel, or seasonal use.”
  • Manufactured homesLimited

    Placement and residential use of manufactured homes within identified Mercer County flood-hazard areas.

    • Installation must be performed by a contractor possessing a valid West Virginia Manufactured Home Installer’s license.
    • The installation design must be engineered for flood hazards specific to the site.
    • The lowest floor, ductwork, and utilities, including HVAC/heat pump, must be elevated two feet above the Base Flood Elevation.
    • The home must be elevated on reinforced piers or equivalent engineered foundation elements attached to a permanent foundation.
    • The frame must be anchored to resist flotation, collapse, and lateral movement.
    • Dry-stacked block installation designs and ground anchors as permanent foundation systems are not allowed in flood-hazard areas.
    • The licensed installer must inspect the site and certify in writing that the home meets the stated standards.
    • Placement or relocation within the floodplain also requires a permit application and certificate of compliance.

    minimum elevation above Base Flood Elevation: >= 2 feet

    “elevated two feet above the Base Flood Elevation.”
  • Well permitRequired

    Construction, modification, or abandonment of a water well in Mercer County.

    • A permit is required from the local county health department.
    • A certified well driller must perform the work.
    • Site approval is required before the permit is issued.
    • New wells should be tested for bacteria by state-certified laboratories.
    “In West Virginia, constructing, modifying, or abandoning a water well requires a permit from the local county health department. A certified well driller must perform the work, with site approval required before a permit is issued. New wells should be tested for bacteria by state-certified labs.”
  • Mandatory utility hookupConditional

    Permanent utility connections to buildings or premises in Mercer County areas of flood hazard regulated by the Mercer County Floodplain Ordinance.

    • The inspector may not inspect and approve a permanent utility connection until possessing a certificate of compliance from the Local Floodplain Administrator.
    • A permanent utility connection may not be installed until the certificate of compliance has been issued.
    • The certificate states that the development conforms to the local floodplain law.
    • The rule applies to buildings or premises created, erected, installed, or rebuilt in areas of flood hazard.
    “In areas of flood hazard it shall be unlawful to install a permanent utility connection to any building or premises, or both, or part thereof hereafter created, erected, installed or rebuilt until a certificate of compliance has been issued by the Local Floodplain Administrator stating that the development conforms to the requirements of this local law.”
  • Agricultural exemptionAvailable (with conditions)

    Agricultural improvements, materials, and related accumulations on land used in whole or part for farm, ranch, other agricultural, or similar purposes, under Mercer County's Abandoned and Dilapidated Building Ordinance.

    • The exemption is limited to regulation under the Abandoned and Dilapidated Building Ordinance; it does not establish a general exemption from all county, state, floodplain, health, or other requirements.
    • The ordinance applies exclusive of incorporated towns and cities, United States and West Virginia government properties, and farm, ranch, or other agricultural properties as described in the recitals.
    • Covered agricultural items include buildings, barns, sheds, outbuildings, storehouses, houses, cabins, cribs, silos, bins, shelters, pens, coops, corrals, parlors, fences, gates, appurtenances, and listed agricultural materials or byproducts.
    “all agricultural improvements and materials are completely and permanently excluded from regulation under this ordinance”
  • Subdividing landRegulated (with conditions)

    Subdivision proposals and related development in Mercer County identified floodplain areas, including the Floodway Fringe (F2) and Approximated Floodplain (F4).

    • A permit application must be completed and a certificate of compliance obtained from the Floodplain Administrator before development, new construction, substantial improvement, repair of substantial damage, or placement or relocation of a structure.
    • Where land is subdivided or otherwise developed, a site plan must be submitted to and approved by the Floodplain Administrator before development.
    • In the Approximated Floodplain (F4), subdivision proposals and other proposed new developments fully or partially within F4 that are greater than ten lots or two acres, whichever is lesser, must include base flood elevation data.
    • Development must comply with the floodplain ordinance and other applicable codes, ordinances, and regulations insofar as consistent with the floodplain ordinance and flood-hazard minimization.
    • Within a floodway, encroachment is allowed only upon the required hydrologic and hydraulic showing, demonstration that no reasonable alternative exists, and proof that the encroachment is the minimum necessary.

    F4 base flood elevation data threshold: > 10 lots (Applies to subdivision proposals and other proposed new developments fully or partially within F4; the alternative threshold is two acres, whichever is lesser.) · F4 base flood elevation data threshold: > 2 acres (Applies to subdivision proposals and other proposed new developments fully or partially within F4; the alternative threshold is ten lots, whichever is lesser.)

    “greater than ten (10) lots or two (2) acres, whichever is the lesser, shall include base flood elevation data.”
  • Permit feesVariable (with conditions)

    Floodplain development permits and related determinations in Mercer County.

    • A $20.00 floodplain determination fee applies to all proposed development.
    • A $50.00 fee applies for completion of a Special Flood Hazard Determination Form for real estate, loan, or insurance purposes.
    • Permit fees for development in a regulated flood hazard area are based on estimated construction value as determined by the Floodplain Administrator.
    • Site plans, grading, and filling incur an additional $25.00 per acre or part thereof.
    • Floodway development reviews incur an additional $100.00 per thousand dollars.
    • Applicants must reimburse additional review or inspection service costs, including professional engineering and surveying; the Floodplain Administrator may require a deposit.
    • Fees are doubled when work requiring a permit begins before the permit is obtained; doubled payment does not excuse compliance or other penalties.

    floodplain determination fee: 20 USD (all proposed development) · special flood hazard determination form fee: 50 USD (real estate, loan, or insurance purposes) · 1 & 2 family dwelling permit fee: per 10 USD per thousand dollars of estimated construction value · accessory structures permit fee: per 8 USD per thousand dollars of estimated construction value · other structures permit fee: per 20 USD per thousand dollars of estimated construction value · site plans, grading & filling additional fee: per 25 USD per acre or part thereof · floodway development review additional fee: per 100 USD per thousand dollars of estimated construction value

    “A Floodplain Determination fee of $20.00, payable to the Mercer County Floodplain Development Fund shall be assessed on all proposed development.”
  • Building permitNot required

    Mercer County's official ordinance list includes no adopted building code; per WV framework building permits are only required where a county adopts the state code, so unincorporated residential construction generally needs no county building permit (floodplain/subdivision ordinances aside).

    Mercer County Commission Ordinances ↗Scouted from the county site, not yet independently re-checked

  • Who permits septicMercer County Health Department

    The Mercer County Health Department (Bluefield, WV) issues onsite sewage/septic permits (Form SS-182A) and performs site evaluations and inspections under WV DHHR authority.

    Mercer County Health Department - Permits & Applications ↗Scouted from the county site, not yet independently re-checked

West Virginia rules that apply here

  • Owner-builder exemptionAvailable

    A property owner or occupant personally performing construction work on a structure, for purposes of exemption from West Virginia contractor licensure.

    • The exemption concerns contractor licensure and does not itself waive any applicable building permit, State Building Code, State Fire Code, inspection, or certificate-of-occupancy requirement.
    • The statute separately exempts work personally performed by an owner or lessee on property whose primary use is agricultural or farming enterprise.
    • If the owner hires another person to perform the work for compensation, the hired person may be subject to contractor licensure requirements and building-permit prerequisites.
    “Except as otherwise provided in this code, the following are exempt from licensure: [...] Work personally performed on a structure by the owner or occupant thereof;”
    One more reviewed finding on this topic
    • Available (with conditions) — Owner-builders and owner-occupants personally performing construction work on property in Mercer County, for purposes of West Virginia contractor licensing.
      “Except as otherwise provided in this code, the following are exempt from licensure: [...] Work personally performed on a structure by the owner or occupant thereof; and”
  • Building code adoptedPartial

    West Virginia's State Building Code framework and its application in counties and municipalities that adopt the code.

    • The State Building Code has force and effect in counties and municipalities adopting it; it is not automatically applicable statewide solely by state promulgation.
    • A county or municipality may adopt the code only prospectively, not retroactively.
    • Buildings or structures utilized primarily for agricultural purposes are exempt from the State Building Code, the State Fire Code, and any adopted county or municipal building code or ordinance such as the ICC International Property Maintenance Code.
    • If another state law, county or municipal ordinance, or agency regulation imposes a more stringent or higher standard and is not inconsistent with West Virginia law or contrary to recognized standards and good engineering practices, that provision governs.
    • Enforcement is the responsibility of the respective local jurisdiction.
    • The active State Building Code rule is West Virginia Code of State Rules 87-04, effective August 1, 2022.

    effective date: 2022-08-01

    “The rules shall be in accordance with standard safe practices so embodied in widely recognized standards of good practice for building construction and all aspects related thereto and have force and effect in those counties and municipalities adopting the State Building Code: Provided, That each county or municipality may adopt the code to the extent that it is only prospective and not retroactive in its application; Provided, however, That buildings or structures utilized primarily for agricultural purposes shall be exempt from the provisions of the State Building Code, the State Fire Code, and any county or municipal building code or ordinance that is or may be adopted, such as the ICC International Property Maintenance Code.”
  • Zoning districtsPartial

    West Virginia zoning ordinances and zoning district maps adopted by county or municipal governing bodies.

    • West Virginia law permits counties and municipalities to enact zoning ordinances; it does not provide a single statewide district map in the cited sources.
    • A county zoning ordinance may cover the entire county or only parts of it.
    • A municipality's zoning ordinance covers its entire jurisdiction.
    • Zoning boundaries and classifications must be shown on a zoning district map.
    • Certified maps must be filed with the applicable governing body, planning commission, and county clerk.
    • The cited sources do not identify the actual district names or maps for each county or municipality.
    “The boundaries of each zone and the designated classifications must be shown on a zoning district map. The boundaries may only be changed after appropriate public hearing and zoning district map changes are adopted by the governing body.”
  • Minimum lot sizeSpecified

    Subdivision and land-development ordinances adopted by applicable West Virginia governing bodies and administered through applicable planning commissions.

    • The cited statute requires local subdivision and land-development ordinances to include lot-size standards but does not establish a single statewide numeric minimum lot size.
    • Actual requirements may vary by local ordinance, zoning district, subdivision type, or applicable exemption.
    • The statute also provides for waivers from minimum standards.

    lot-size regulation: Subdivision and land-development ordinances must include standards for lot sizes. (Local standards and waivers may apply.)

    “The standards for setback requirements, lot sizes”
  • Accessory dwellingsAllowed (with conditions)

    At least one accessory dwelling unit by right on a lot or parcel containing a single-family dwelling within a West Virginia municipality, subject to the statutory definition and applicable regulatory requirements.

    • The accessory dwelling unit must be self-contained and independently accessed, be on the same parcel as a larger single-family dwelling, and include cooking, sleeping, and sanitation facilities.
    • The unit may be attached, detached, or internal to the single-family dwelling.
    • An attached or detached unit may not exceed 75 percent of the single-family dwelling's gross floor area or 1,000 square feet, whichever is less.
    • The municipality may impose applicable fire, building, construction, zoning, and other federal, state, and local regulatory requirements.
    • A municipality may require a water-system and sewer-system will-serve letter, or Department of Health approval where municipal or private water or sewer service is unavailable.
    • A municipality may charge an application-review fee up to $250 per accessory dwelling unit, in addition to usual building fees.
    • The statutory restrictions apply to policies, regulations, or ordinances in effect on or after January 1, 2027, and conflicting provisions are invalid to the extent of the conflict.
    • The statute does not regulate short-term rentals and does not supersede applicable regulatory requirements.

    maximum detached or attached ADU size: <= 75 percent of primary dwelling gross floor area (The alternative cap is 1,000 square feet, and the lesser limit controls.) · maximum detached or attached ADU size: <= 1000 square feet (The alternative cap is 75 percent of the primary dwelling gross floor area, and the lesser limit controls.) · maximum application-review fee: <= 250 USD per accessory dwelling unit (Usual building fees may be charged in addition to the application fee.) · conflicting municipal policy effective date: >= 2027-01-01 (Conflicting provisions are invalid to the extent of the conflict.)

    “a municipality shall not adopt a policy, regulation, or ordinance that restricts, prohibits, or otherwise regulates the use of at least one accessory dwelling unit”
  • Driveway accessRequired

    New driveways or approaches connecting private property to West Virginia state highways or located within state highway rights-of-way.

    • The permit is free of charge from any Division office.
    • Permits are granted only for legitimate access to private property and when location, design, and construction comply with Division of Highways specifications.
    • Driveways must not be located in sharp curves, on steep grades, within intersections, or where they interfere with signs, signals, or drainage.
    • Unauthorized driveway installation can result in a fine or removal.
    • The source directs applicants to check with the applicable District Office before building.
    “A reminder from the Division of Highways to property owners building new driveways — don’t forget your permit. Available free of charge from any Division office, permits are required by state law in order to assure that there is no uncontrolled access to state highways that would reduce the road’s safety or interfere with efficient movement of traffic.”
    One more reviewed finding on this topic
    • Required — New driveways or approaches connecting private property in Mercer County to state highways.
      “Available free of charge from any Division office, permits are required by state law”
  • Building in a floodplainRequired

    Development in floodplains regulated by participating West Virginia counties and flood-prone municipalities, including dredging, filling, grading, excavation, and stream crossings.

    • Every county and flood-prone municipality participates in the NFIP and has an ordinance regulating floodplain development.
    • Most stream-restoration projects involving dredging, filling, grading, or excavation are considered development for which a county or community permit is required.
    • Before altering or relocating a watercourse, the applicant must consult the local floodplain permit officer regarding whether a permit is required and the fee.
    • Approximate A zones require written assurance that flood-carrying capacity will be maintained; except for extremely small projects, this generally requires pre- and post-development engineering studies showing no unacceptable rise of 1 foot or greater.
    • AE zones without a designated floodway may not create more than a 1-foot cumulative rise, and an engineering study may be required.
    • AE zones with floodways require hydrologic and hydraulic analysis showing zero rise in base flood elevation.
    • Before issuance, the permit officer requires copies of all other federally or state-required permits.
    • Permit cost varies.

    unacceptable rise threshold: >= 1 ft (Except for extremely small projects in Approximate A zones.) · cumulative rise limit in AE zones without floodway: <= 1 ft · base flood elevation rise in AE zones with floodway: 0 ft · permit cost: varies

    “Every county and flood prone municipality in West Virginia participates in the National Floodplain Insurance Program (NFIP), and has an ordinance to regulate development in the floodplain. The ordinance includes a flood map that designates floodplain areas, and establishes a permitting system to regulate new development in the floodplain.”
  • Permit processPartial

    WVDEP construction stormwater authorization for residential, commercial, and industrial land-disturbance operations statewide.

    • A permit is required for sites disturbing one acre or greater, including smaller sites that are part of a larger common plan of development.
    • The owner/developer is responsible for obtaining the permit when ownership and operation differ.
    • Applications must be submitted through WVDEP's Electronic Submittal System.
    • A Notice of Termination is required after completion and stabilization.

    disturbance threshold: >= 1 acre (Smaller sites that are part of a larger common plan of development are included.)

    “If you are going to disturb one acre or greater you are required to first obtain a stormwater construction permit. All applications for coverage under the construction stormwater general permit must be submitted through WV DEP's Electronic Submittal System (ESS).”
  • county zoning authorityGeneral

    West Virginia counties adopting zoning for all or part of their jurisdiction, including unincorporated areas.

    • The county governing body must work with the planning commission and the public to develop the zoning ordinance.
    • The ordinance may cover the county's entire jurisdiction or only parts of it.
    • The statute also authorizes municipalities to regulate land use within their own jurisdictions; municipal zoning is not county zoning.
    • No effective date or fee is stated in the cited provision.
    “(3) Enacting a zoning ordinance. (b) A zoning ordinance may cover a county's entire jurisdiction or parts of its jurisdiction.”
  • county building authorityGeneral

    West Virginia county commissions adopting and enforcing building and housing codes for residential construction in unincorporated portions of the county.

    • The county commission must act by order duly entered of record.
    • Codes may establish and regulate minimum building and housing standards for improving health, safety, and well-being.
    • Codes may apply to the entire county or any portion or portions constituting an effective area; the county need not adopt the code for other portions.
    • The code does not apply within a municipal corporation that has adopted and has in effect a housing and building code unless and until the municipality provides otherwise by ordinance.
    • Structures on parcels used primarily for agricultural purposes are excluded.
    • Any county property-maintenance code or ordinance must exempt property used for agricultural purposes and is unenforceable as to agricultural property.
    • Existing county building codes became void one year after promulgation of a state building code by the State Fire Commission; after that voidance, a county adopting a building code must adopt the state building code.
    • A county may adopt the state building code after promulgation, but it does not apply within a municipal corporation that has not adopted it.
    “county commissions are hereby authorized and empowered, by order duly entered of record, to adopt building and housing codes”
    One more reviewed finding on this topic

Still unanswered

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

  • Minimum dwelling size — Minimum dwelling size requirements for residential dwellings in unincorporated Mercer County.
  • Setbacks — Building and structure setbacks in unincorporated Mercer County.
  • Lot coverage — Lot-coverage limits in unincorporated Mercer County.
  • Building height — Building-height limits in unincorporated Mercer County.
  • Tiny homes — Occupancy of tiny homes in Mercer County, including unincorporated areas.
2 more unanswered
  • Off-grid sanitation
  • 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 Mercer County, West Virginia

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

Mercer County scores 68/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and low administrative friction for a quiet rural property. Watch-outs: a weaker property-autonomy legal backdrop.

Do you need a building permit in Mercer County, West Virginia?

Mercer County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Mercer County 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 Mercer County, West Virginia?

Land in Mercer County runs about $2,733 per acre, based on the latest county data.

What is the water situation in Mercer County?

Mercer County gets about 42.1" of rain a year, with severe drought in roughly 0.9% of years.

How remote is Mercer County?

A representative private-land location has about 49,759 people within a 30-minute drive and 1,374,888 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.

Off-grid gear

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

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How Mercer compares in West Virginia

Compare side-by-side →See all 55 West Virginia counties ranked →