Bolthole Index

Harris County, Texas

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

38Index Score / 100
#225 of 254 in Texas

Unincorporated Harris County, Texas requires a county development permit before residential construction; Harris County does not have a full building code12. Harris County has no zoning regulations in its unincorporated area, but floodplain and driveway permits may apply345. Harris County Wastewater Permitting issues septic permits for unincorporated property; municipal development or subdivision review may apply inside municipal extraterritorial jurisdictions67.

At a glance

Building permit
Development permit required; county lacks a full building code12
Zoning
No zoning regulations in unincorporated Harris County3
Septic permits
County Wastewater Permitting reviews plans and issues OSSF permits68
Owner-builder exemption
State installation permit available for qualifying industrialized-home work9
RV / tiny home / manufactured home
No county zoning restriction; development, sanitation and private restrictions still apply101
Permit fees
Variable by application; use the county fee schedule11
Well permits
District permit plus a county approval letter unless an exception applies12
Driveway access
County permit required in county right-of-way; TxDOT process applies on state highways513

Who to call

Building permits

Harris County Office of the County Engineer - Permits Division

Development permits for all construction, plus floodplain (Class I/II) permits and unofficial floodplain determinations, in unincorporated Harris County

713-274-3900

Septic permits

Harris County Office of the County Engineer - Water Quality Permitting Group

On-site sewage facility (septic) permits for unincorporated Harris County, issued as TCEQ's authorized agent under the Harris County Local Order and 30 TAC 285

713-274-3900

Well permits

Harris-Galveston Subsidence District

Water well permits for Harris County; issued by this district rather than the county or TCEQ

281-486-1105

1660 West Bay Area Blvd., Friendswood, TX 77548

Also useful

Harris County Office of the County Engineer

General contact point for the Office of the County Engineer, which administers unincorporated Harris County's development, floodplain and septic permits

713-274-3600

1111 Fannin, 11th Floor, Houston, TX 77002

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 Harris 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 unincorporated Harris County, Texas?

A county development permit is required before building a home in unincorporated Harris County, and Harris County does not have a full building code12. Builders, developers and contractors for single-family residential development must submit notices of foundation, frame and final inspections through ePermits14. A single-family home or duplex built in the floodplain also needs an Elevation Certificate, an As-Built Certificate and a final inspection15. All work in a regulated floodplain needs a Floodplain Development Permit, including grading, filling, paving and construction4. Application, permit and administrative fees vary, so use the fee schedule for each development, septic, driveway or floodplain application1116. The county's Certificate of Compliance applies to qualifying commercial structures, not as a general residential certificate of occupancy17.

Who issues building permits in Harris County, and who handles septic?

The Harris County Office of the County Engineer handles development and floodplain permits in unincorporated Harris County; call the Permits Division at 713-274-39001814. City building offices handle building permits in Pasadena19, La Porte20, Deer Park21, Bellaire22, West University Place23, Webster24, Galena Park25, Jersey Village26. Baytown requires city approval for residential fences and manufactured-home parks27; Tomball requires a city permit to construct or enlarge an RV park28. Harris County Wastewater Permitting issues septic permits for unincorporated property; the Harris-Galveston Subsidence District issues well permits, with a separate county approval-letter requirement unless an exception applies612.

Does Harris County have zoning?

Harris County has no zoning regulations in its unincorporated area, but enforces floodplain, septic, driveway and sign rules3. City zoning applies inside Baytown29, La Porte30, Deer Park31, Bellaire32, South Houston33, West University Place34, Galena Park35, Jacinto City36, Jersey Village37. County Wastewater Permitting’s septic authority described here covers unincorporated land; Galena Park requires city and county health-unit septic approval when its septic conditions apply, while Jacinto City provides a temporary city septic permit where sewer service is unavailable, subject to state requirements and county recommendation63839. Municipal subdivision review may also extend into extraterritorial jurisdictions7.

How do septic (OSSF) permits work in unincorporated Harris County?

Installing or upgrading an on-site sewage facility in unincorporated Harris County requires an OSSF septic permit from Harris County Wastewater Permitting86. In ePermits, choose “Residential Onsite Sewage Facility (OSSF)/Septic” and upload the required property information, site evaluation, design plan, technical report, flow diagram and maintenance contract; the published review schedule is 30 business days, and other departments may need to approve the application4041. Harris County cannot issue the county development permit until the OSSF installation-and-operation permit has been issued, so septic belongs early in the schedule42. Initial and final septic inspections are required, and the licensed installer must give at least 24 hours' notice43. Only 2.6% of county soils are rated without severe limits for a conventional drain field, making the site evaluation especially important44. Wastewater must remain in the property's soil rather than surface or discharge into a ditch, stream or gully45.

Can you live in an RV, tiny home or manufactured home on your land in unincorporated Harris County?

Unincorporated Harris County has no county zoning restriction on RV occupancy, tiny-home occupancy, manufactured-home occupancy, accessory dwellings, temporary camping, minimum dwelling size, minimum lot size, setbacks, lot coverage or building height10. That answer concerns county zoning only: a county development permit still applies to development, and an on-site wastewater system needs the applicable septic permit and inspections1843. Municipal subdivision review may reach some extraterritorial jurisdictions7. A homeowner responsible for qualifying work on an industrialized house can seek a state residential installation permit instead of registering as an industrialized builder, but that permit does not waive applicable local permits or inspections9. State trade-license exemptions for work on an owner's residence are conditional, not a blanket exemption for every trade46.

Building a home in unincorporated Harris County: the steps, in order

  1. Confirm whether the parcel is unincorporated, inside a city or in a municipal extraterritorial jurisdiction; municipal development or subdivision review may apply outside the county's unincorporated process7.
  2. Check the floodplain before design; all floodplain work needs a Floodplain Development Permit, and floodplain homes require elevation documents and a final inspection415.
  3. If the site needs septic, apply through ePermits first because Harris County cannot issue the county development permit until the OSSF installation-and-operation permit is issued4042.
  4. Apply for the county development permit before construction and consult the fee schedule for variable application, permit and administrative fees147.
  5. Submit a completed residential application and detailed site plan for a driveway in county right-of-way, including a roadside ditch; state-highway access follows TxDOT's separate driveway-permit process513.
  6. For a private well, obtain the district permit and determine whether the county approval-letter requirement or an exception applies1248.
  7. Submit the residential foundation, frame and final inspection notices, and arrange the septic system's initial and final inspections1443.

What to check before you buy land in unincorporated Harris County

Before buying unincorporated Harris County land, verify city and extraterritorial-jurisdiction boundaries, plat status, floodplain, legal road access, water source and wastewater plan7494. A driveway crossing county right-of-way needs a county driveway permit, while state-highway access follows TxDOT's driveway-permit process513. For a private well, ask the Harris-Galveston Subsidence District about its well permit and the County Engineer about the separate approval letter; county exceptions include parcels of at least 10 acres and qualified open-space land, and the county response time for the notice and diagram is 10 business days1248. Septic feasibility deserves attention because only 2.6% of Harris County soils are rated without severe limitations for a conventional drain field44. Typical property taxes run about 1.7% of value, with a median annual bill near $4,382, while a typical home insurance premium is about $2,702 a year505152. County fees vary by application47.

Watch-outs

  • A county approval-letter exception for a private well does not establish an exemption from the Harris-Galveston Subsidence District’s well-permit process12.
  • Harris County requires a development permit before residential construction even though it does not have a full building code, and residential builders must provide foundation, frame and final inspection notices53214.
  • We could not confirm a general agricultural exemption or universal water/sewer connection rule for unincorporated Harris County; ask the Office of the County Engineer before budgeting a farm project or utility connection54.

Sources

  1. Permits FAQ, quoted and re-checked
  2. Commercial Building, quoted and re-checked
  3. oce.harriscountytx.gov, quoted and re-checked
  4. Floodplain Management, quoted and re-checked
  5. oce.harriscountytx.gov, quoted and re-checked
  6. Wastewater Quality Permitting, quoted and re-checked
  7. Platting FAQ, quoted and re-checked
  8. Wastewater Quality Permitting, quoted and re-checked
  9. IHB – Residential Installation Permit Application Instructions, quoted and re-checked
  10. Texas law on county zoning and building authority
  11. oce.harriscountytx.gov, quoted and re-checked
  12. Residential Construction & On-site Sewage System (Septic) — Water Well Regulations, quoted and re-checked
  13. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  14. Tract Home Builders, quoted and re-checked
  15. Tract Home Builders, quoted and re-checked
  16. Minor Site Development & Driveways, quoted and re-checked
  17. Certificate of Compliance, quoted and re-checked
  18. Harris County Office of the County Engineer - Permits Division (oce.harriscountytx.gov)
  19. Pasadena: Fee Schedule (Harris County), quoted and re-checked
  20. La Porte: Building Permits & Inspections FAQs (Harris County), quoted and re-checked
  21. Deer Park: Building Department (Harris County), quoted and re-checked
  22. Bellaire: Development Services (Harris County), quoted and re-checked
  23. West University Place: Permits | West University Place, TX (Harris County), quoted and re-checked
  24. Webster: official source (Harris County), quoted and re-checked
  25. Galena Park: Permits & Inspections (Harris County), quoted and re-checked
  26. Jersey Village: Residential Building Permits (Harris County), quoted and re-checked
  27. Baytown: Sec. 18-1041. Building permit; compliance required (Harris County), quoted and re-checked
  28. Tomball: Code § 26-58, Recreational vehicle parks—Construction or enlargement permits (Harris County), quoted and re-checked
  29. Baytown: Sec. 21-122. Permit required (Harris County), quoted and re-checked
  30. La Porte: Development Ordinances (Harris County), quoted and re-checked
  31. Deer Park: Building in Deer Park (Harris County), quoted and re-checked
  32. Bellaire: Development Services (Harris County), quoted and re-checked
  33. South Houston: South Houston Code of Ordinances, Appendix A, § 1.3 (Harris County), quoted and re-checked
  34. West University Place: Appendix A—Zoning Ordinance, § 7A-101 (Harris County), quoted and re-checked
  35. Galena Park: Sec. 12.501. - District A regulations (Harris County), quoted and re-checked
  36. Jacinto City: Jacinto City Code of Ordinances, Chapter 11, Article 16: Definitions (Harris County), quoted and re-checked
  37. Jersey Village: Residential permitted use table (Harris County), quoted and re-checked
  38. Galena Park: Sec. 58-81. - Septic tanks (Harris County), quoted and re-checked
  39. Jacinto City: Jacinto City Code of Ordinances, Chapter 10, Section 2: Sewer System Connections (Harris County), quoted and re-checked
  40. Residential Construction & On-site Sewage System (Septic), quoted and re-checked
  41. Residential Construction & On-site Sewage System (Septic), quoted and re-checked
  42. Wastewater FAQ, quoted and re-checked
  43. Wastewater Quality Permitting, quoted and re-checked
  44. 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
  45. Wastewater FAQ, quoted and re-checked
  46. Exemptions to Electrician Licensing (Texas statewide rule), quoted and re-checked
  47. Minor Site Development & Driveways, quoted and re-checked
  48. Harris-Galveston Subsidence District (oce.harriscountytx.gov)
  49. Platting, quoted and re-checked
  50. Effective property tax rate: Bolthole Index county data
  51. Median property tax bill: Bolthole Index county data
  52. Typical home insurance premium: Bolthole Index county data
  53. oce.harriscountytx.gov, quoted and re-checked
  54. Harris County Office of the County Engineer (oce.harriscountytx.gov)

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, Harris County has no countywide zoning.

RuleHarris CountyFort Bend CountyMontgomery CountyWaller CountyLiberty CountyBrazoria CountyChambers County
Building permitLimitedLimitedLimitedRequiredRequiredLimitedRequired
County zoningNoNoNoNoNoNoNo
Septic permitsCounty Office of the County EngineerCounty Env. Health Dept.County Env. Health ServicesCounty Env. Div.County EngineeringCounty Env. Health Dept.County Env. Health & Permitting

County locator

Harris County in Texas

38
County map
Harris County highlighted among the Texas counties · colored by Index score

How Harris County scores

Seclusion10100% ev.
Self-Sufficiency54100% ev.
Admin Boringness7490% ev.
Durability58100% ev.
Property Autonomy71100% ev.
Carry Cost61100% 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 →

$282kTypical home
1.7%Property tax
$9,000Land / acre
53.5"Annual rain
11.4% of yrsSevere drought
13.3 / yr (+11.5)Mid-century 100°F days
18 daysMid-century dry spell
2.99" (+3.6%)Mid-century 1-day rain
1.42×Wildfire change factor
100%Forward climate coverage
$2,702Home insurance / yr
1.1% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
1,447,237People within 30 min
8,925,722People within 2 hr
1,809,170Radius comparison (15 mi)
2,832.6People / sq mi
1.5%Federal land
100%Land at 15% slope or less
2.6%Soils rated "not limited" for septic (strict USDA rating)
27,799 acWorkable land screen
29.1 tonsBiomass / forest ac
69.8°FAvg temp

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Cities and towns in Harris 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: Houston · Humble · Morgan's Point · Southside Place

Answers from the rulebook for Harris County

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

Harris County rules

  • Building permitLimited

    Residential development and construction in unincorporated Harris County.

    • A county development permit is required for development.
    • The source does not establish a general county residential building-code permit equivalent to a municipal building permit.
    • Floodplain, onsite sewage, driveway, subdivision, and other specialized permits may also apply.
    • Construction may begin only after required permits are obtained.
    “A permit is needed for all development within Harris County.”
    One more reviewed finding on this topic
    • Required — Development, including residential construction, in the unincorporated areas of Harris County.
      “Section 4.01 of the Regulations for Flood Plain Management in Harris County states that: "All development within the unincorporated areas of Harris County without first securing a permit is prohibited".”
  • Building code adoptedPartial

    County building-code controls for unincorporated Harris County.

    • The county page states that it does not have a full building code in unincorporated Harris County.
    • Applicable fire, floodplain, health, state, and other referenced codes may still apply.
    • The source does not identify a single residential code edition for all unincorporated residential construction.
    “Other architectural or Mechanical, Electrical, Plumbing (MEP) drawing sheets that are needed to demonstrate compliance with the applicable codes (keep in mind, we do not have a full building code in unincorporated Harris County, so we typically do not need an entire set of structural or MEP drawings).”
  • InspectionsRequired

    Single-family residential development in unincorporated Harris County.

    • Builders, developers, and contractors must provide notices of foundation, frame, and final inspections through E-Permits.
    • For floodplain fill, inspection is required in the floodplain but not for fill outside the floodplain or development outside the floodplain.
    “all builders, developers, and contractors are required to provide a notice of foundation, frame, and final inspection”
    One more reviewed finding on this topic
    • Required — Single-family homes and duplexes on residential property built in the floodplain in unincorporated Harris County.
      “An Elevation Certificate (EC), As-Built Certificate (ABC), and a final inspection are required for single-family homes and duplexes on a residential property that are built in the floodplain.”
  • Certificate of occupancyLimited

    Certificate of Compliance, the county occupancy-related certificate, for businesses and commercial structures requiring Fire Marshal inspection.

    • It is required for businesses to operate in Harris County.
    • It is issued only to commercial structures that require a Fire Marshal inspection.
    • All applicable inspections must be completed and passed, all required permits closed out, and the Fire Marshal inspection passed.
    • Processing time is 10 business days; fee and administrative fee refer to the fee schedule; renewal is not required.

    processing time: 10 business days

    “A Certificate of Compliance is required for businesses to operate in Harris County, and it is only issued to commercial structures that require a Fire Marshal’s inspection.”
  • County-wide zoningAbsent

    County zoning regulations in unincorporated Harris County.

    • The county expressly identifies floodplain management, on-site sewage facilities, driveways, and signs as regulations it does enforce.
    • Municipal regulations may apply in incorporated areas or municipal extraterritorial jurisdictions.
    “No, Harris County does not have zoning regulations in the unincorporated area. However, they do enforce regulations related to floodplain management, on-site sewage facilities, driveways and signs.”
    One more reviewed finding on this topic
    • Absent — Zoning regulations in unincorporated Harris County.
      “Harris County does not have zoning regulations in the unincorporated area.”
  • Local zoningVaries (with conditions)

    Aggregate local zoning and land-use controls across Harris County, including incorporated municipalities and municipal extraterritorial jurisdictions.

    • Harris County has no zoning regulations in unincorporated areas.
    • Several municipalities extend development ordinances into their extraterritorial jurisdictions and may require municipal review and approval of subdivision land.
    • This is an aggregate county claim and does not state that Harris County administers municipal ordinances.
    “Several municipalities have extended their development ordinances to require municipal review and approval of subdivision of land within their extraterritorial jurisdictions in unincorporated Harris County.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning.

    • 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 (with conditions)

    Residential and commercial septic systems/OSSFs in unincorporated Harris County.

    • Harris County Wastewater Permitting reviews plans and issues permits; submissions use ePermits.
    • The county page also links the Harris County Local Order and TCEQ rules.
    “Wastewater Permitting reviews plans and issues permits for Septic Systems/On-Site Sewage Facilities (OSSFs) as well as reviews plan sets for Wastewater Treatment Plants in unincorporated Harris County.”
    One more reviewed finding on this topic
    • County (with conditions) — Permitting administration for septic systems and OSSFs in unincorporated Harris County.
      “Wastewater Permitting reviews plans and issues permits for Septic Systems/On-Site Sewage Facilities (OSSFs) as well as reviews plan sets for Wastewater Treatment Plants in unincorporated Harris County.”
  • Septic permitRequired

    Residential septic systems and other on-site sewage facilities in unincorporated Harris County.

    • Wastewater Permitting reviews plans and issues permits for septic systems/OSSFs.
    • Residential system plans must be submitted through ePermits for review by a Texas-registered Professional Engineer or Licensed Registered Sanitarian.
    • The Authorization to Construct is issued after fees are paid.
    • The septic application must include a valid address and HCAD property tax number, an affidavit to the public, testing acknowledgment, site evaluation, design site plan, technical report, system flow diagram, and other listed documents.
    “Wastewater Permitting reviews plans and issues permits for Septic Systems/On-Site Sewage Facilities (OSSFs) as well as reviews plan sets for Wastewater Treatment Plants in unincorporated Harris County.”
    One more reviewed finding on this topic
    • Required — Installation or upgrade of an on-site sewage facility in unincorporated Harris County.
      “To install an on-site sewage facility, or to upgrade an existing facility, an on-site sewage facility permit must be obtained.”
  • Septic inspectionRequired

    Residential septic systems and other on-site sewage facilities administered by Harris County in unincorporated Harris County.

    • An inspection may be scheduled only with a valid septic permit and approved septic plans bearing the Permit Office's stamps.
    • A licensed septic installer must notify the Permits Office at least 24 hours before the system will be ready for inspection.
    • If the system fails inspection, reinspection fees may be required.
    • The Authorization to Construct is issued after fees are paid.

    advance inspection notice: >= 24 hours (The notice is required before the septic system will be ready for inspection.)

    “When an OSSF design is approved and permitted, Initial and Final Inspections are required for the system.”
  • Off-grid sanitationLimited

    On-site sanitation through an OSSF/septic system in unincorporated Harris County.

    • An OSSF permit is required before installation or upgrade.
    • Wastewater must seep into the soil on the property and must not rise to the surface or discharge into a roadside ditch, stream, or gully.
    • The system must be properly maintained.
    “All wastewater must seep into the soil on the property”
  • Well permitLimited

    Private water wells drilled in unincorporated Harris County.

    • A Harris County approval letter is required unless an enumerated exception applies.
    • Exceptions include a parcel of at least 10 acres, qualified open-space land, certain groundwater or subsidence district locations, mineral exploration or production, and a public water system permitted by TCEQ.
    • The county page states that water-well permits are issued by the Harris-Galveston Subsidence District.

    parcel size exception: >= 10 acres (The parcel must otherwise satisfy the page's listed exception conditions.) · county response time: 10 business days (The County Engineer reviews the notice and diagram and responds with approval or disapproval.)

    “You need our approval letter if you are drilling a private water well within the unincorporated area of Harris County.”
    One more reviewed finding on this topic
  • Subdividing landRegulated (with conditions)

    Subdivision and platting in unincorporated Harris County areas outside municipal ETJs.

    • In no-ETJ areas, Harris County Platting solely reviews and approves subdivision land.
    • Municipalities may require municipal review and approval in their ETJs.
    • An OSSF subdivision planning report is required before approval of plats not located within a known public-sewer service area.
    • Platting exception requests are available where applicability is uncertain.
    “Subdivision of land in certain areas (No ETJ) is solely reviewed and approved by Harris County Platting Group.”
  • Driveway accessRequired

    A driveway built within the County Right-of-Way in unincorporated Harris County.

    • Any driveway built within the Right-of-Way requires a permit.
    • For residential applications, Harris County requires a completed residential application and an accurate and detailed site plan.
    • If a ditch is in front of the property and lies within the County Right-of-Way, the same permitting requirement applies.
    “The area between your property line and the street is called the Right-of-Way. Any driveway built within that Right-of-Way will require a permit.”
    One more reviewed finding on this topic
    • Required — Driveways built within Harris County right-of-way for residential property.
      “Any driveway built within that Right-of-Way will require a permit.”
  • Building in a floodplainRequired

    Work and structures in the Special Flood Hazard Area or other floodplain areas regulated by Harris County.

    • A post-construction finished-floor elevation certificate certified by a Texas-registered surveyor, engineer, or architect is required for SFHA structures.
    • For structures in or adjacent to the SFHA, two elevation certificates are required: one before slab pouring and one post-construction.
    • SFHA work includes grading, filling, paving, construction, and other projects.
    • The county FAQ states that all development in unincorporated areas without first securing a permit is prohibited.
    “A Floodplain Development Permit is required for all work in the floodplain.”
  • Permit feesVariable (with conditions)

    Residential and minor-site-development permit fees in unincorporated Harris County.

    • Fees depend on the application and may include application, permit, and administrative fees.
    • The county pages refer applicants to a fee schedule but do not provide the numeric amounts in the opened pages.
    “The application fee, permit fee, and admin fee (if applicable) must be paid”
    2 more reviewed findings on this topic
    • Published (with conditions) — County residential, floodplain, driveway, septic, and related permit pages that provide fee-schedule references.
      “Fee See Fee Schedule Administrative Fee See Fee Schedule”
    • Published (with conditions) — County permit fees for development and related permit applications in unincorporated Harris County.
      “The application fee, permit fee, and admin fee (if applicable) must be paid prior to downloading the approved plans or the reviewer’s comments.”
  • Permit processPublished (with conditions)

    Residential OSSF/septic permit application process in unincorporated Harris County.

    • Applicants must register for ePermits, locate the address, select the Residential OSSF/Septic application, provide required information, complete the application, and upload necessary documents.
    • A valid address and HCAD property tax number, affidavit, site evaluation, design plan, technical report, flow diagram, and maintenance contract are among the listed requirements.

    processing time: 30 business days (Residential septic page schedule.)

    “Here are the steps for applying through E-Permits:”
    One more reviewed finding on this topic

Texas rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    A homeowner who purchases an industrialized house or residential modular component and takes responsibility for some or all construction involved in its installation, including in unincorporated Harris County.

    • The homeowner must be responsible for the construction covered by the permit and must complete it in accordance with mandatory building codes, engineered foundation drawings, engineered unique on-site construction details, and the manufacturer's approved on-site construction details.
    • The industrialized builder or its subcontractors may not complete the work covered by the residential installation permit; if they will complete the work, the house is not eligible for the permit.
    • The permit cannot be used for non-code-compliant construction, construction that does not match engineered documents, or construction that does not match approved manufacturer installation instructions or other approved documents.
    • The homeowner must submit the application before the work is completed; an application cannot be filed after completion.
    • The homeowner must complete and notarize the certification and submit the application with the non-refundable $75 registration fee.
    • The residential installation permit permits the homeowner to complete the covered construction without registering as an industrialized builder; it does not eliminate applicable local permits or inspections. In a municipality, local building permits and inspections remain required. Outside a municipality or where there is no municipal building inspection department, required inspections and a final on-site inspection report with no outstanding violations are required.
    • Electrical utility connections may only be completed by a Texas-licensed electrician; homeowners may not make those connections themselves.

    registration fee: 75 USD (non-refundable)

    “The Residential Installation Permit only allows you, the homeowner, to complete this construction yourself without registering as an industrialized builder. Local permits are still required to be obtained and inspections of the construction will be performed by the local building inspection office (if within the jurisdiction of a city or municipality).”
    2 more reviewed findings on this topic
    • Conditional — An owner performing electrical, plumbing, or air-conditioning and refrigeration work on the owner's own residence or homestead in Texas.
      “A person who perform electrical work on a dwelling that they own and reside in is not required by the state to be licensed as electricians.”
    • Conditional — Electrical work on a dwelling owned and occupied by the property owner in Texas.
      “A person who perform electrical work on a dwelling that they own and reside in is not required by the state to be licensed”
  • 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.”
    One more reviewed finding on this topic
    • Limited — County zoning authority over unincorporated land in Texas, where a specific statutory grant applies.
      “As you suggest, a county has very limited and specific zoning authority, and none that may be used to regulate construction or operation of the proposed facility.”
  • 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.”
    One more reviewed finding on this topic
    • Limited — County fire-code adoption and building-permit authority for specified buildings in unincorporated areas of qualifying Texas counties, including multifamily residential dwellings of four or more units.
      “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.”

Still unanswered

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

  • Mandatory utility hookup — Water and sewer utility connections in unincorporated Harris County.
  • Agricultural exemption — Agricultural exemptions from Harris County development or permit requirements.
  • Short-term rentals — Short-term rentals in unincorporated Harris County.

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

Water rights & wells in Harris County

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

Over-appropriated / declining

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

Household wellExempt up to a limit

Texas groundwater is governed by the rule of capture; a Groundwater Conservation District must exempt qualifying domestic/livestock wells and may not restrict their production, but well registration and spacing rules can still apply and the exemption does not cover wells serving a platted subdivision.

Limit: Domestic/livestock well exempt from GCD production permitting if on a tract >10 acres AND incapable of producing >25,000 gal/day (Tex. Water Code §36.117)

Texas Water Code §36.117 / TWDB ↗
  • Harris-Galveston Subsidence Districtpartial of county

    Created 1975 to end land subsidence by cutting groundwater use; a science-based Regulatory Plan caps groundwater at 10-20% of demand by 2035 and requires district permits and Groundwater Reduction Plans for large users. Small domestic wells largely exempt.

    Texas Water Development Board — Groundwater Districts ↗

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

Living off-grid in Harris County, Texas

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

Harris County scores 38/100 on the Bolthole Index, a marginal county profile. Its strengths: low administrative friction for a quiet rural property and a stronger property-autonomy legal backdrop. Watch-outs: little seclusion — roughly 1,447,237 people within a 30-minute drive.

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

Harris 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 Harris County Office of the County Engineer - Watershed Protection / Wastewater Quality Permitting (TCEQ authorized agent). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

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

Living in an RV on your own land in Harris County is allowed: Unincorporated Harris County: no county rule sets this, because Harris County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Harris County's own reviewed answer confirms it has no county-wide zoning. 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 Harris County, Texas?

Land in Harris County runs about $9,000 per acre, based on the latest county data.

What is the water situation in Harris County?

Harris County gets about 53.5" of rain a year, with severe drought in roughly 11.4% of years. On water rights, Harris County lies in the Harris-Galveston Subsidence District — Created 1975 to end land subsidence by cutting groundwater use; a science-based Regulatory Plan caps groundwater at 10-20% of demand by 2035 and requires district permits and Groundwater Reduction Plans for large users. Small domestic wells largely exempt..

How remote is Harris County?

A representative private-land location has about 1,447,237 people within a 30-minute drive and 8,925,722 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 Harris compares in Texas

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