Bolthole Index

Hardin County, Texas

Zoning, building permits and septic rules in Sour Lake, Texas

Sour Lake, Texas prohibits installing a recreational vehicle as a residential dwelling inside city limits1. The city has its own zoning districts, including AG and R23, and its City Secretary takes permit and zoning applications4. We could not confirm who issues septic permits inside the city; Hardin County's rules cover the unincorporated land around it.

At a glance

RV as a home
Prohibited inside Sour Lake city limits1
Manufactured homes
Allowed with a city location permit in areas the city approves; Sour Lake's $125 fee applies to parks and manufactured-home lots56
Zoning
City zoning with AG (agricultural) and R (single-family residential) districts23
Minimum lot, R district
7,000 sq ft3
Minimum lot, AG district
32,670 sq ft (three-quarters of an acre)2
Building height
35 feet in AG and R districts78
Floodplain
Floodplain development permit required9
Septic inside city
We could not confirm the permitting office; ask the City Secretary4

Who to call

Building permits

City of Sour Lake (City Secretary)

Planning and zoning applications and building permit questions inside Sour Lake city limits.

(409) 287-3574

625 TX-105 Sour Lake, Texas 77659

Building permits

City of Sour Lake permit information

Residential, commercial and repair/alteration permit applications.

(409) 287-3574

625 TX-105 Sour Lake, Texas 77659

Floodplain permits

Hardin County Floodplain Administration

Hardin County's development and floodplain permits for unincorporated land; the county page does not say whether it applies inside cities.

(409) 246-5250

[email protected]

225 Crocker Street, Kountze, TX 77625

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

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

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Does Sour Lake, Texas have zoning, and what does it mean for RVs and manufactured homes?

Sour Lake has zoning of its own, with named districts such as AG (Agricultural) and R (Residential Single-Family Dwelling)23. The city prohibits installing a mobile home or recreational vehicle as a residential dwelling within its corporate limits1. The prohibition looks forward only: a mobile home that was legally permitted and lived in earlier can be replaced with a HUD-code manufactured home1.

A HUD-code manufactured home needs a city location permit, and installation is allowed only in areas the city has determined appropriate, such as subdivisions, single lots, rental communities and parks5. An application is deemed approved unless the city denies it in writing within 45 days and gives a reason10. Valid deed restrictions still apply5. We could not confirm any tiny-home or temporary-camping rule; ask the City Secretary4.

What are the lot size, setback and height rules in Sour Lake?

Rules depend on the district. In the R district, a lot must be at least 7,000 square feet, 70 feet wide and 100 feet deep3. Setbacks there are 25 feet in front and 25 feet in the rear, with 5 feet on interior sides, or 7.5 feet for buildings of two or more stories11. The R district also sets a minimum living area of 120 square feet12.

In the AG district, the minimum lot is 32,670 square feet, or three-quarters of an acre, and each lot needs at least 25 feet of frontage on a dedicated public street2. AG setbacks are 25 feet in front, 7 feet on the side and 10 feet in the rear13. No building in either district may exceed 35 feet78.

Do you need a building permit in Sour Lake, and who issues it?

Inside Sour Lake, the city runs its own permitting. The city's permit page answers "Do I need a permit?" with "Likely," and lists the work that does not need one instead14. Residential, commercial and repair/alteration applications are listed under the city's Permitting menu14. For zoning and development requests, applicants contact the City Secretary, and the City Manager reviews the application before the Planning & Zoning Commission and City Council act4.

We could not confirm the city's adopted building code, inspection rules or certificate-of-occupancy requirements. Call the city at (409) 287-3574 before you design anything4. A floodplain development permit is also required inside the city9.

How do septic permits work inside Sour Lake?

We could not confirm which office issues septic permits for lots inside Sour Lake. Texas requires a permit and approved plan to build, alter, repair or operate an on-site sewage facility15. In most areas a local government acts as a TCEQ-authorized agent, and the TCEQ regional office issues permits where none has been authorized16. For unincorporated Hardin County, the county subdivision manual names the Hardin County Environmental Health Department or TCEQ17.

A tract of at least 10 acres can qualify for an exemption, but only when every condition is met, including a site evaluation and 100 feet from the property line15. The soil survey rates almost none of Hardin County's soils as unlimited for a conventional drain field, so expect a site evaluation and possibly an engineered system18. Ask the City Secretary whether city sewer reaches your lot4.

Building a home in Sour Lake: the steps, in order

  1. Confirm the lot's district (AG or R) with the City Secretary and check lot size, frontage and setbacks43.
  2. Check for deed restrictions, which still apply5.
  3. If you plan a manufactured home, apply for the city location permit5.
  4. Apply for the building permit through the city's Permitting menu14.
  5. Ask who permits septic or whether sewer is available, since we could not confirm it4.
  6. Check flood status and get a floodplain development permit if required9.
  7. Do not plan to live in an RV on site while you build1.

What stays with Hardin County, and what to check before you buy near Sour Lake

The county's rules apply to unincorporated land, not city lots. Hardin County has no county zoning ordinance, so land outside city limits is not zoned by the county19. Hardin County runs a development permit program through its Floodplain Administration at (409) 246-525020, but its page does not say whether it applies inside cities21. For land outside the city, see the Hardin County page.

A driveway onto a state highway needs a TxDOT permit on Form 105822. Hardin County's effective property tax rate is 1.2%23.

Watch-outs

  • The RV ban covers living in an RV inside Sour Lake city limits; it does not tell you the rule on land outside the city1.
  • We could not confirm the city's building code, inspection rules, septic authority or tiny-home rules, so call the City Secretary at (409) 287-3574 before buying4.
  • Hardin County's septic, floodplain and subdivision rules apply to unincorporated land, and its page does not say they reach inside cities21.

Sources

  1. Sour Lake Code of Ordinances, § 157.03 Prohibition of Mobile Homes and Recreational Vehicles (Sour Lake), quoted and re-checked
  2. Sour Lake Code of Ordinances, § 153.21 AG - Agricultural District (Sour Lake), quoted and re-checked
  3. Sour Lake Code of Ordinances, § 153.22 R - Residential Single-Family Dwelling District (Sour Lake), quoted and re-checked
  4. City of Sour Lake (City Secretary) (cityofsourlake.com)
  5. Sour Lake Code of Ordinances, § 157.04 Permit for Manufactured Home Location (Sour Lake), quoted and re-checked
  6. Sour Lake Code of Ordinances, § 157.04 Permit for Manufactured Home Location (Sour Lake), quoted and re-checked
  7. Sour Lake Code of Ordinances, § 153.21 AG - Agricultural District (Sour Lake), quoted and re-checked
  8. Sour Lake Code of Ordinances, § 153.22 R - Residential Single-Family Dwelling District (Sour Lake), quoted and re-checked
  9. Sour Lake Code of Ordinances, § 151.08 Development Permit (Sour Lake), quoted and re-checked
  10. Sour Lake Code of Ordinances, § 157.04 Permit for Manufactured Home Location (Sour Lake), quoted and re-checked
  11. Sour Lake Code of Ordinances, § 153.22 R - Residential Single-Family Dwelling District (Sour Lake), quoted and re-checked
  12. Sour Lake Code of Ordinances, § 153.22 R - Residential Single-Family Dwelling District (Sour Lake), quoted and re-checked
  13. Sour Lake Code of Ordinances, § 153.21 AG - Agricultural District (Sour Lake), quoted and re-checked
  14. City of Sour Lake permit information (cityofsourlake.com)
  15. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  16. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  17. Hardin County Subdivision Manual, quoted and re-checked
  18. 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
  19. Texas law on county zoning and building authority
  20. Hardin County Floodplain Administration (hardincountytx.gov)
  21. Permits | Hardin County, Texas, quoted and re-checked
  22. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  23. Effective property tax rate: Bolthole Index county data

Written October 24, 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.

Answers from the rulebook for Sour Lake

Sour Lake’s own rules

  • Living in an RVProhibited

    Use or occupancy of a recreational vehicle as a residential dwelling inside Sour Lake city limits.

    • The prohibition is prospective and excludes a mobile home previously legally permitted and used or occupied as a residential dwelling; city permits must be granted for replacement of such a mobile home with a HUD-code manufactured home.
    “The city prohibits the installation of a mobile home or recreational vehicle for use or occupancy as a residential dwelling within its corporate limits.”
  • Manufactured homesLimited

    HUD-code manufactured homes proposed as residential dwellings inside Sour Lake city limits.

    • A city location permit is required.
    • Installation is permitted only in areas determined appropriate by the city, including subdivisions, planned unit developments, single lots, rental communities, and parks.
    • An application is deemed approved unless denied in writing within 45 days stating the reason.
    • Valid deed restrictions remain effective.

    city review period before deemed approval: <= 45 days (The city may deny in writing within that period and state the reason.)

    “Upon application, the installation of HUD-code manufactured homes shall be permitted as residential dwelling in those areas determined appropriately by the city, including subdivisions, planned unit developments, single lots and rental communities and parks.”
  • Building in a floodplainRequired

    Floodplain development inside Sour Lake city limits.

    • The permit is required to ensure conformance with Chapter 151.
    “A floodplain development permit shall be required to ensure conformance with the provisions of this chapter.”
  • Permit feesPublished (with conditions)

    Placement of a manufactured home in a mobile-home park or on a manufactured-home lot inside Sour Lake city limits.

    • The published fee applies only to the specified manufactured-home placement category.

    manufactured home placement permit fee: 125 USD (Per manufactured-home placement within a mobile-home park or on a manufactured-home lot.)

    “A non-refundable fee of $125 per manufactured home placement within a mobile home park or on a manufactured home lot.”
  • Permit processPartial

    City permit applications to install HUD-code manufactured homes inside Sour Lake city limits.

    • The city may deny the application in writing within 45 days and must state the reason.
    • The section does not establish the general building-permit process.

    deemed approval period: <= 45 days (Applies unless the city denies the application in writing and gives the reason.)

    “An application to install a HUD-code manufactured home for use and occupancy as a residential dwelling is deemed approved and granted unless the city denies the application in writing within 45 days from receipt of the application setting forth the reason.”

Rules another office applies inside Sour Lake

Sour Lake does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum dwelling sizeSpecified

    Dwellings in the R - Residential Single-Family Dwelling District inside Sour Lake city limits.

    • Garages and covered or enclosed porches are excluded from dwelling-size calculations.
    • A principal dwelling below 1,000 square feet must meet the stated county-appraisal median-taxable-value condition.

    minimum living area: >= 120 square feet (Garages and porches are excluded.)

    “One hundred and twenty square feet shall be the minimum living area of a dwelling in this zoning district.”
  • Minimum lot sizeSpecified

    Lots in the R - Residential Single-Family Dwelling District inside Sour Lake city limits.

    • A preexisting lot of record under 7,000 square feet may be used for permitted use if the requirements in § 153.22(C)(1)-(3) and (7) are met.

    minimum lot area: >= 7000 square feet (Preexisting lots of record are subject to the stated exception.) · minimum lot width: >= 70 feet (Measured at the required front-yard setback line.) · minimum lot depth: >= 100 feet

    “The minimum area of the lot shall be 7,000 square feet; however, a lot having an area of less than 7,000 square feet that was of record prior to the passage of this chapter may be used for any use permitted in this section provided the requirements of divisions (C)(1) - (3) and (7) are met.”
    One more reviewed finding on this topic
  • SetbacksSpecified

    Residential structures in the R - Residential Single-Family Dwelling District inside Sour Lake city limits.

    • For interior side yards, a two-or-more-story building requires a 7.5-foot setback.
    • For exterior side yards on corner lots, the setback is 15 feet if abutting a neighboring side yard and 10 feet if abutting a neighboring back yard.

    front setback: >= 25 feet (On the addressed street.) · interior side setback: >= 5 feet (7.5 feet for buildings with two or more stories.) · rear setback: >= 25 feet

    “For interior side yards, there shall be a five foot setback. A seven-and-one-half foot setback shall be required for buildings with two or more stories.”
    One more reviewed finding on this topic
  • Building heightSpecified

    Buildings in the AG - Agricultural District inside Sour Lake city limits.

    maximum building height: <= 35 feet

    “Height restrictions. No building shall exceed 35 feet in height.”
    One more reviewed finding on this topic

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Sour Lake or Hardin County directly.

  • Building permit — General residential construction inside Sour Lake city limits.
  • Owner-builder exemption — Owner-built residences inside Sour Lake city limits.
  • Building code adopted — Construction inside Sour Lake city limits.
  • Inspections — Building construction inside Sour Lake city limits.
  • Certificate of occupancy — Occupancy of structures inside Sour Lake city limits.
12 more unanswered
  • Lot coverage
  • Camping on your land
  • Tiny homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • 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.

Unanswered questions are usually a sign that Sour Lake publishes no rule on the point, not that none exists. Hardin County’s page lists the county offices to call.

← All of Hardin County: county rules, score and offices