Bolthole Index

Smith County, Texas

Building permits, zoning and land rules in Smith County, Texas

67Index Score / 100
#57 of 254 in Texas

Unincorporated Smith County, Texas has no general county building permit for an ordinary home, although flood-hazard development is separately permitted1. Smith County also has no traditional countywide zoning2. Septic permits are administered through Smith County's contractor, RTS Environmental LLC3.

At a glance

Building permit
No general permit; flood-hazard development is separately permitted1
Zoning
No traditional countywide zoning on unincorporated land2
Septic
Administered by RTS Environmental LLC3
RV and tiny home
Unrestricted under county zoning rules4
Minimum home size
No county zoning rule sets one4
Owner-builder
We could not confirm a specific exemption; ask the county5
Driveway culverts
Regulated in subdivisions and county-road rights-of-way6

Who to call

Floodplain permits

Smith County Engineer / Road & Bridge Department

County rights-of-way and the published floodplain-development permit form

903-590-4800

135 SSE Loop 323, Tyler, TX 75702

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 Smith County, Texas?

Unincorporated Smith County does not require a general county building permit for ordinary home construction; the county says its only local building policies are subdivision regulations1. Development in a mapped flood-hazard area is the important exception and requires a separate flood-development permit1. Road & Bridge publishes the county permit form7. We could not confirm a general inspection program, adopted building code, or certificate-of-occupancy requirement; ask Road & Bridge before work begins.

Who handles Smith County building permits and land questions?

Smith County does not operate a general building-permit office for ordinary construction in unincorporated areas1. The closest first stop is the Engineer / Road & Bridge Department, whose page covers county rights-of-way and publishes the floodplain permit form7. The office is at 135 SSE Loop 323, Tyler, TX 75702, and 903-590-48007. Septic questions go to RTS Environmental LLC at 903-630-4234 or [email protected]38.

Does Smith County have zoning?

Unincorporated Smith County has no traditional countywide zoning ordinance2. County zoning therefore sets no minimum dwelling size, minimum lot size, setback, lot-coverage cap, or height limit there4. County zoning also does not restrict accessory dwellings, manufactured homes, tiny-home occupancy, RV occupancy, or temporary camping4. Separate subdivision, floodplain, and septic rules still apply when triggered219. City rules and private deed restrictions require separate review.

How do septic permits work in Smith County?

Smith County is the local OSSF authority, and RTS Environmental LLC is its contractor3. For a new or repaired system, a licensed installer and registered sanitarian handle the design and permitting process9. Septic and aerobic systems must be maintained and inspected10. A narrow exception can apply on at least 10 acres when every state condition is met11. Only 27.5% of county soils lack severe conventional drain-field limitations, so evaluate the site early12.

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

County zoning does not restrict RV or tiny-home occupancy on unincorporated Smith County land4. County zoning likewise sets no minimum dwelling size there4. Flood-hazard development still requires the county permit1. An OSSF generally enters the county septic process unless the specific state exception applies911. State-highway access also requires an executed TxDOT driveway permit13. Check city boundaries and private covenants separately.

Building a home in Smith County: the steps in order

  1. Confirm the parcel is outside city limits; this guide's permit answer concerns unincorporated Smith County1.
  1. Check mapped flood hazards and contact Road & Bridge if development is proposed there17.
  1. Arrange septic evaluation and permitting through an installer and RTS Environmental98.
  1. Resolve access: county culvert rules cover subdivisions and county-road rights-of-way, while state-highway access requires TxDOT approval613.
  1. Verify utilities, deeds, easements, restrictions, and plat status before construction.

What should you check before buying Smith County land?

Start with flood exposure, septic suitability, access, and municipal boundaries. Flood-hazard development is the main county permit trigger1. Only 27.5% of soils lack severe conventional drain-field limitations12. County culvert rules apply in subdivisions and county-road rights-of-way but do not establish a universal permit for every parcel6. Smith County averages 46.2 inches of annual precipitation, while severe drought occurs in 14.9% of years1415. We could not confirm a general well-permit or utility-connection rule; ask the serving district or utility.

Watch-outs

  • Mapped flood-hazard development needs a separate county permit1.
  • Smith County requires septic and aerobic systems to be maintained and inspected10.
  • The reviewed culvert rule does not establish a universal driveway permit for every parcel6.

Sources

  1. County Ordinances & Policies, quoted and re-checked
  2. Smith County Subdivision Regulations (revised 2023) (2026 county census)
  3. On-Site Sewage Facility, quoted and re-checked
  4. Texas law on county zoning and building authority
  5. (2026 county census)
  6. Subdivision Regulations, Revised July 14, 2023, quoted and re-checked
  7. Smith County Engineer / Road & Bridge Department (smith-county.com)
  8. Smith County OSSF Program (RTS Environmental LLC, contractor) (smith-county.com)
  9. On-Site Sewage Facility, quoted and re-checked
  10. On-Site Sewage Facility, quoted and re-checked
  11. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  12. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  13. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  14. Annual precipitation: Bolthole Index county data
  15. Share of years in severe drought: 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.

Found land here? Start a Property Hunt →

County locator

Smith County in Texas

67
County map
Smith County highlighted among the Texas counties · colored by Index score

How Smith County scores

Seclusion29100% ev.
Self-Sufficiency73100% ev.
Admin Boringness7290% ev.
Durability69100% ev.
Property Autonomy71100% ev.
Carry Cost66100% 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 →

$274kTypical home
1.2%Property tax
$7,161Land / acre
46.2"Annual rain
14.9% of yrsSevere drought
27.5 / yr (+20.3)Mid-century 100°F days
21.2 daysMid-century dry spell
2.48" (+6.4%)Mid-century 1-day rain
1.4×Wildfire change factor
100%Forward climate coverage
$2,139Home insurance / yr
0.4% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
183,956People within 30 min
5,796,738People within 2 hr
145,838Radius comparison (15 mi)
266.1People / sq mi
0%Federal land
93.9%Land at 15% slope or less
27.5%Septic soil without severe limits
156,705 acWorkable land screen
54.9%Wooded land
41.3 tonsBiomass / forest ac
65.4°FAvg temp

Scout Smith County

Camp here before you commitBook a few nights nearby on Hipcamp →Already own land here?Earn money hosting campers — get $100 when you become a Hipcamp host →

Some links are affiliate or referral links — we may earn a commission, at no cost to you.

Property hunt

Find land. Bring the promising ones back.

Search live inventory elsewhere, then cost and vet each candidate here. No copied listings, account, or paid data feed.

View your full hunt →
ZillowLand & lotsRealtor.comLand listingsLandSearchRural & vacant land

Each button opens a current land search for Smith County. Listing sites control their own results and filters.

Analyze a property
Add setup-cost allowances

Use rough quotes or placeholders. Blank fields count as $0.

Working estimate

—land + entered setup costs
Asking $ / acre
—
Setup allowance
—
All-in $ / acre
—

A planning estimate, not a valuation or contractor quote. The USDA benchmark includes farm land and buildings; it is context, not a parcel comp.

Before an offer

Parcel due diligence

0/8 checked

Saved properties and checklist progress stay on this device. Bolthole Index does not receive them.

Answers from the rulebook for Smith County

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

Smith County rules

  • Building permitLimited

    Construction and other development in areas regulated by Smith County floodplain rules; ordinary construction outside those county programs is not established by the cited county page as requiring a county building permit.

    • Floodplain development permits apply only where required by the flood-damage-prevention ordinance.
    • Subdivision regulations and municipal rules may impose separate requirements.
    • The county ordinance requires review of other federal, state, or local approvals where prior approval is required.
    “Other than subdivision regulations, Smith County has no local building policies for construction in unincorporated areas of the county.”
    One more reviewed finding on this topic
    • Limited — Construction and development in unincorporated Smith County, especially mapped flood-hazard areas.
      “Other than subdivision regulations, Smith County has no local building policies for construction in unincorporated areas of the county.”
  • InspectionsLimited

    Fire and life-safety inspections, including new-construction inspections, in unincorporated Smith County.

    • The cited requirement is for fire and life-safety inspections, not a general structural-building inspection program.
    • Inspections are conducted during normal business hours Monday through Friday.
    • The Fire & Life Safety Inspection Standard is NFPA 101 20215 ed., NFPA 1, and other referenced codes and standards.
    “In accordance with Local Government Code, Chapter 352.016, all fire and life safety inspections in unincorporated Smith County must performed by a fire inspector, or approved designee.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum dwelling size · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum lot size · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Setbacks · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Lot coverage · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Building height · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Living in an RV · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Camping on your land · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Tiny homes · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Manufactured homes · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Accessory dwellings · by state lawNo county rule

    Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Who permits septicCounty

    Residential and commercial on-site sewage facilities administered for Smith County.

    • RTS Environmental LLC is identified as the county contractor.
    • State Chapter 285.3 rules apply to the stated 10-acre exception.
    “RTS Environmental LLC, run by Trace Stanley, is the contractor for Smith County.”
    2 more reviewed findings on this topic
    • County (with conditions) — On-site sewage facility administration in Smith County.
      “RTS Environmental LLC, run by Trace Stanley, is the contractor for Smith County.”
    • County (with conditions) — Local administration of on-site sewage facilities in Smith County.
      “RTS Environmental LLC, run by Trace Stanley, is the contractor for Smith County. The office can be reached at 903-630-4234 or [email protected]”
  • Septic permitLimited

    Installation or repair of an OSSF in Smith County.

    • A licensed installer contacts a registered sanitarian to design the system or repair and handle permitting.
    • No planning materials, permits, or inspection are required for an OSSF serving a single-family dwelling on a tract of at least 10 acres when it causes no nuisance or groundwater pollution, all parts are at least 100 feet from the property line, effluent is disposed of on the property, and it is the only dwelling on the tract.

    minimum lot size: >= 0.5 acre (unless the land was plotted before 1989) · 10-acre exception: >= 10 acres (all stated Chapter 285.3 conditions must be satisfied)

    “No planning materials, permits, or inspection are required for an OSSF for a single-family dwelling located on a tract of land that is 10 acres or larger and”
    One more reviewed finding on this topic
    • Limited — New or repaired on-site sewage facilities in Smith County.
      “No planning materials, permits, or inspection are required for an OSSF for a single-family dwelling located on a tract of land that is 10 acres or larger and”
  • Septic inspectionLimited

    Existing septic or aerobic systems and OSSF installation in Smith County.

    • The county page states septic and aerobic systems must be maintained and inspected.
    • The Chapter 285.3 10-Acre Rule states that no inspection is required for a qualifying single-family dwelling OSSF on a tract of at least 10 acres, subject to all listed conditions.

    minimum tract for stated exception: >= 10 acres (The tract must satisfy every listed 10-Acre Rule condition.)

    “If you have a septic or aerobic system, you are required to maintain it and have it inspected.”
    One more reviewed finding on this topic
    • Limited — Existing septic or aerobic systems in Smith County.
      “If you have a septic or aerobic system, you are required to maintain it and have it inspected.”
  • Off-grid sanitationLimited

    On-site sanitation for qualifying single-family dwellings in Smith County.

    • The 10-acre rule applies only to a single-family dwelling on a tract of at least 10 acres.
    • The OSSF must not cause nuisance or groundwater pollution; all parts must be at least 100 feet from the property line; effluent must be disposed of on the property; and the single-family dwelling must be the only dwelling on the tract.

    tract size: >= 10 acres (single-family dwelling only)

    “No planning materials, permits, or inspection are required for an OSSF for a single-family dwelling located on a tract of land that is 10 acres or larger and”
  • Mandatory utility hookupConditional

    Utility service to a manufactured-home rental community or manufactured home governed by the county subdivision regulations.

    • A utility may not provide water, sewer, gas, or electric service unless the owner provides a Certificate of Compliance.
    • The certificate does not indicate compliance with city, state, or federal requirements.
    “A utility may not provide utility services, including water, sewer, gas, and electric services, to a manufactured home rental community or to a manufactured home in the community unless the owner provides the utility with a copy of the certificate of compliance.”
  • Driveway accessLimited

    Subdivision and development access involving Smith County roads or state-maintained rights-of-way.

    • TxDOT access concurrence is required when proposed access includes ingress or egress to a state-maintained right of way.
    • Subdivision drainage plans must identify driveway culvert lengths and diameters.
    • Driveway culverts must be designed to carry a ten-year storm with headwater depth not exceeding a height equal to the pipe diameter.

    driveway culvert design storm: 10 year storm

    “TxDOT access concurrence when proposed access will include ingress and/or egress to a state maintained right of way.”
    One more reviewed finding on this topic
    • Limited — Driveway culvert and access design within subdivisions and county-road rights-of-way in unincorporated Smith County.
      “Driveway culverts shall be designed to carry a ten-year storm, with the headwater depth not exceeding a height equal to the diameter ofthe pipe;”
  • Building in a floodplainRequired

    Development in areas of special flood hazard regulated by the Smith County Flood Damage Prevention Ordinance.

    • The County Engineer or Road & Bridge Administrator acts as Floodplain Administrator.
    • The administrator reviews permit applications, including manufactured-home placement, and reviews required federal, state, or local approvals.
    • Where no regulatory floodway is designated, new construction, substantial improvements, or other development including fill in Zones A1-30 and AE require demonstration that cumulative effects will not increase base-flood elevation more than one foot at any point.

    maximum cumulative base-flood elevation increase: <= 1 foot (where no regulatory floodway has been designated and the cited zone conditions apply)

    “Review, approve or deny all applications for development permits required by the adoption of this ordinance.”
  • Permit processPublished (with conditions)

    Smith County subdivision plat applications and floodplain development permits.

    • Plat applications must include required documentation.
    • Incomplete applications require notice of missing documents within 10 business days.
    • Final action is generally due within 60 days after a completed application is received, subject to stated extensions.
    • Floodplain applications are reviewed by the Floodplain Administrator.

    missing-document notice: <= 10 business days · final plat action: <= 60 days (subject to statutory extensions)

    “If a person submits a plat application to the commissioners court that does not include all of the documentation or other information required by Subsection (a), the commissioners court or the court's designee shall, not later than the 10th business day after the date the commissioners court receives the application, notify the applicant of the missing documents or other information.”
  • County-wide zoningAbsent

    Smith County regulates subdivisions and floodplain development in unincorporated areas; its current county regulations do not establish traditional county-wide land-use zoning.

    Smith County Subdivision Regulations (revised 2023) ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

  • Building code adoptedPartial

    Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.

    • The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
    • The effective date is July 1, 2024.
    • The International Existing Building Code applies to alterations of portable industrialized buildings.
    • Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
    • Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
    • Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.

    effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)

    “July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
  • county zoning authorityLimited

    Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.

    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    • Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
    • The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.

    Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)

    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • county building authorityLimited

    Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.

    • Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
    • Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
    • The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
    • A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
    • The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
    • Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
    • Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
    • A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
    • Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.

    county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)

    “The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemptions potentially applicable to construction in Smith County.
  • Certificate of occupancy — Certificates of occupancy in unincorporated Smith County.
  • Local zoning — Aggregate local zoning across Smith County and incorporated municipalities.
  • Well permit — Private and other water wells in Smith County.
  • Agricultural exemption — Agricultural exemptions from Smith County development, building, or land-use requirements.
1 more unanswered
  • 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 Smith County, Texas

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

Smith County scores 67/100 on the Bolthole Index, a strong county profile. Its strengths: workable self-sufficiency basics: 46.2″/yr rainfall and 54.9% wooded land and low administrative friction for a quiet rural property. Watch-outs: about 183,956 people within a 30-minute drive.

Do you need a building permit in Smith County, Texas?

Smith County requires a building permit only in limited cases (such as floodplains or specific zones), and it has no county-wide zoning. Onsite septic is permitted by Smith County (TCEQ Authorized Agent), OSSF program administered via RTS Environmental LLC. 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 Smith County?

Living in an RV on your own land in Smith County is allowed: Unincorporated Smith County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Smith County has no zoning ordinance. The county legal census found no county zoning ordinance, citing smith-county.com. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Smith County, Texas?

Land in Smith County runs about $7,161 per acre, based on the latest county data.

What is the water situation in Smith County?

Smith County gets about 46.2" of rain a year, with severe drought in roughly 14.9% of years.

How remote is Smith County?

A representative private-land location has about 183,956 people within a 30-minute drive and 5,796,738 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 Smith County means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

How Smith compares in Texas

Compare side-by-side →See all 254 Texas counties ranked →