Willacy County, TX Building Permits, Zoning & Septic Rules

Unincorporated Willacy County, Texas has no zoning ordinance, so the county sets no minimum lot size, setback or use restriction on a parcel¹². It does run a building-permit program through its Permits Department, covering residential and commercial construction, manufactured homes, and electrical, plumbing and demolition work, tied to the county's floodplain and subdivision rules rather than a full municipal building code³. The same office issues on-site sewage facility (septic) permits as the Texas Commission on Environmental Quality's local authorized agent⁴. Willacy County is also one of just two counties Texas law lets adopt zoning near Padre Island, though nothing on the county's own site shows it has⁵.

At a glance

Building permit: Required for residential and commercial construction, tied to floodplain and subdivision rules rather than a full building code³
Zoning: None; no minimum lot size, setback or use restriction is set countywide¹²
Septic permit: Required for new construction and system modifications; the Permits Department issues them as TCEQ's authorized agent⁴
RV, tiny home or manufactured home: No zoning-based restriction on occupancy, though a manufactured home still needs a county permit²³
Minimum lot size / setbacks: None set countywide; there's no zoning ordinance to set them²
Owner-builder exemption: Unconfirmed; the county's own site doesn't state one⁶
Septic-favorable soils: About 36.7% of the county's land is rated free of severe limits for a conventional septic drain field⁷
Property tax: About 1.9% effective rate; median bill around $1,164/year⁸⁹

Who to call

Building permits

Willacy County Permits Department

Issues residential and commercial building permits, electrical, plumbing/gas and mechanical permits, manufactured-home and moving permits, demolition permits and underground/utility permits, and administers the county's Flood Plains Ordinance and Subdivision Rules and Regulations for unincorporated Willacy County

(956) 689-3393

576 W. Main Ave, Raymondville, Texas 78580

Septic permits

Willacy County Permits Department - On-Site Sewage Facility (OSSF) Program

Issues on-site sewage facility (OSSF) permits for new construction and system modification, as the Texas Commission on Environmental Quality's authorized agent for unincorporated Willacy County

(956) 689-3393

576 W. Main Ave, Raymondville, Texas 78580

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

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

Yes, in most cases: unincorporated Willacy County runs a building-permit program through its Permits Department, covering residential and commercial construction, manufactured homes, and electrical, plumbing, gas and mechanical work, plus demolition³¹⁰. The county's own applications list also includes a moving permit and an underground-and-utility permit, alongside its Flood Plains Ordinance and Subdivision Rules and Regulations¹⁰. This isn't a full municipal building code, though: Texas law generally reserves general building-code authority to cities, and gives counties that power only in narrow situations tied to population size or proximity to an international border, neither of which fits a county Willacy County's size¹¹. Willacy County's permitting instead ties to its floodplain and subdivision authority and to manufactured-home and septic rules specifically³.

Who is the Willacy County building department, and how do you reach them?

The Willacy County Permits Department issues building, electrical, plumbing/gas, mechanical, demolition, manufactured-home and moving permits, and is reached at (956) 689-3393 from the Willacy County Courthouse at 576 W. Main Ave, Raymondville, Texas 78580¹⁰. Applications are posted on the county's own site as downloadable forms, and finished permits are submitted to the county Tax Office, Monday through Friday, 8:00am to 11:30am and 1:00pm to 4:00pm¹⁰. Permit fees are cash or check only¹⁰. The same office issues the on-site sewage facility (septic) permit application, so there's no separate septic counter to find¹².

Does Willacy County have zoning?

Willacy County has no zoning ordinance: its own Permits page lists a Flood Plains Ordinance and Subdivision Rules and Regulations, but no zoning code¹¹⁰. Without a zoning ordinance, the county sets no minimum lot size, no setback, no lot-coverage limit and no building-height limit anywhere in unincorporated Willacy County, and places no zoning-based restriction on an accessory dwelling, an RV, a tiny home or a manufactured home used as a residence². Willacy County is unusual in one respect: state law names it, alongside Cameron County, as one of only two counties that may adopt zoning for the part of Padre Island within two miles of a public park or a beach used by at least 500 people a year⁵. Nothing on the county's own site shows it has adopted that authority, so treat a Padre Island parcel the same as the rest of unincorporated Willacy County unless you confirm otherwise with the county¹.

How do septic permits work in Willacy County?

Willacy County requires an on-site sewage facility (OSSF) permit for new construction and for modifying an existing system, and the county's Permits Department issues it as the Texas Commission on Environmental Quality's local authorized agent⁴¹². Statewide, Texas law requires a permit before you construct, install, alter, extend or repair an OSSF, with a narrow exemption for a single-family home on at least 10 acres that meets a list of conditions, including keeping every part of the system at least 100 feet from the property line and it being the only dwelling on the tract¹³. An authorized agent like Willacy County, or its designated representative, reviews plans, issues the permit and inspects installation¹⁴. Soils here are more workable than in many nearby counties: about 36.7% of Willacy County's land is rated free of severe limits for a conventional septic drain field⁷.

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

Willacy County places no zoning-based restriction on RV occupancy, tiny-home occupancy or manufactured-home occupancy on private land, because the county has no zoning ordinance to set one²¹. That's consistent with Texas law generally: counties get zoning power only in specific, named situations, and while Willacy County is named in the Padre Island exception, nothing on the county's site shows it has adopted a zoning ordinance under it⁵. Removing a zoning restriction doesn't remove the county's other permits, though: a manufactured home still needs a manufactured-home permit, and a new septic system needs its own permit regardless of what kind of dwelling sits on top of it¹⁰¹². If your land sits in the floodplain, expect the county's Flood Plains Ordinance to apply no matter what kind of structure you place there¹⁰.

Building a home in Willacy County: the steps, in order

Confirm whether your parcel is in a flood zone or falls under the county's Subdivision Rules and Regulations before you apply for anything, since both shape what the Permits Department will require¹⁰.
Apply for your septic (on-site sewage facility) permit first if you won't be on a municipal sewer system, since Willacy County issues it as TCEQ's authorized agent¹²⁴.
Submit your residential or commercial building permit application, plus electrical, plumbing/gas and mechanical applications as needed, to the Permits Department at 576 W. Main Ave, Raymondville, Texas 78580, (956) 689-3393¹⁰.
If you're placing a manufactured home, use the county's manufactured-home permit application instead of the standard residential one¹⁰.
Pay your permit fees in cash or by check, and submit permits to the county Tax Office Monday through Friday, 8:00am to 11:30am or 1:00pm to 4:00pm¹⁰.
If your driveway connects to a state highway, submit TxDOT's Form 1058 and get a fully executed driveway permit, giving TxDOT 24-hour notice, before starting construction¹⁵.
Budget for property tax: Willacy County runs about a 1.9% effective rate, with a median bill near $1,164 a year⁸⁹.

What to check before you buy land in Willacy County, Texas

Willacy County is sparsely populated: density runs about 33.9 people per square mile across roughly 20,037 residents, and the county sits about 35 miles from the nearest metro area¹⁶¹⁷¹⁸. Terrain is flat -- all of the county sits at 15% slope or less, and only about 5.9% is wooded¹⁹²⁰. Water is a real planning question: the county averages about 25.3 inches of rain a year, with severe drought in roughly 20.2% of recent years, though septic-favorable soils are more common here than in many nearby counties, at about 36.7% rated free of severe limits for a conventional drain field²¹²²⁷. Federal land covers about 11.9% of the county, more than in most of its neighbors, so check whether a specific parcel borders federal land before counting on unrestricted access²³. Farmland has recently valued around $2,789 an acre and a typical home around $174,196, against a roughly 1.9% effective property tax rate and a median bill near $1,164 a year²⁴²⁵⁸⁹.

Watch-outs

Willacy County has no zoning ordinance, even though state law lets it adopt zoning near Padre Island; don't assume a setback or lot-size rule exists anywhere in the county without confirming with the Permits Department¹⁵.
Get your septic (OSSF) permit before your building permit if you won't be on a municipal sewer system -- Willacy County's own applications list both under the same office¹²⁴.
Whether Willacy County recognizes an owner-builder exemption from contractor licensing is not something the county's own site confirms; ask the Permits Department directly before assuming one applies⁶.

Sources

Written September 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.

How Willacy County scores

Seclusion42100% ev.

Self-Sufficiency1896% ev.

Admin Boringness7190% ev.

Durability39100% ev.

Property Autonomy71100% ev.

Carry Cost82100% ev.

Evidence strength: 97%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$174kTypical home

1.9%Property tax

$2,789Land / acre

25.3"Annual rain

20.2% of yrsSevere drought

45.1 / yr (+34.2)Mid-century 100°F days

31.3 daysMid-century dry spell

1.97" (+2.3%)Mid-century 1-day rain

1.32×Wildfire change factor

100%Forward climate coverage

$2,219Home insurance / yr

-2% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

17,694Radius comparison (15 mi)

33.9People / sq mi

11.9%Federal land

100%Land at 15% slope or less

36.7%Septic soil without severe limits

114,914 acWorkable land screen

5.9%Wooded land

7 tonsBiomass / forest ac

74.5°FAvg temp

Answers from the rulebook for Willacy County

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

Willacy County rules

Building permitLimited
County building-permit administration for residential, commercial, manufactured-home, demolition, moving, electrical, plumbing/gas, mechanical, and underground/utility work
- The county page publishes applications and a Building Inspector, but the opened official material does not establish a universal building-permit requirement for every structure or location.
- Municipal requirements may apply inside incorporated municipalities.
“Applications (Click link to download) ▲ 1. Checklist for Initial Application (Residential/Commercial) 2. Residential Building Permit Application 3. Commercial Building Permit Application”
Permits ↗Re-checked Sep 26, 2026
Zoning districts · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum lot size · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Setbacks · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Lot coverage · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Living in an RV · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Camping on your land · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Tiny homes · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Manufactured homes · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us.
- 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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Who permits septicCounty
On-site sewage facilities in Willacy County
- The county application identifies a Willacy County designated representative and county approval process.
- TCEQ rules and Texas Health and Safety Code requirements continue to govern the program.
“Willacy Willacy County AA Adam Ramirez (956) 689-3393”
Application for On-Site Sewage Facility New Construction and Modification ↗Re-checked Sep 26, 2026
Septic inspectionRequired
Installation of on-site sewage facilities in Willacy County
- The permit to operate follows successful inspection of the installed system.
- The inspection concerns compliance with Texas OSSF rules, TAC 30, Chapter 285.
“a permit to operate the facility will be granted following successful inspection of the installed system”
Application for On-Site Sewage Facility New Construction and Modification ↗Re-checked Sep 26, 2026
Off-grid sanitationLimited
On-site sanitation where organized sewage service is unavailable or where an OSSF is proposed
- The subdivision checklist requires the proposed on-site sewerage system to comply with applicable TCEQ rules.
- The county OSSF application requires site evaluation, design materials, approval, and inspection.
“The disposal system does not utilize a borehole, cesspool, or seepage pit (unauthorized systems under 30 TAC 285.3(i)), or a pit privy or portable toilet.”
Willacy County Subdivision Plat Checklists ↗Re-checked Sep 26, 2026
Subdividing landRegulated (with conditions)
Subdivision platting and development in Willacy County
- The checklist applies to all divisions.
- Preliminary and final plat review, county approval, utility documentation, drainage, floodplain, and construction requirements may apply.
- The preliminary approval process becomes void if final approval is not completed within one year.
submission fee: 50 USD · preliminary plat review fee: 350 USD · additional fee: per 100 USD per lot (additional fees listed in the checklist)
“These checklists have been developed by Willacy County to help the Sub-divider comply with the minimum subdivision rules and regulations set forth by state statute for subdivisions”
Willacy County Subdivision Plat Checklists ↗Re-checked Sep 26, 2026
Building in a floodplainLimited
Subdivision and development involving flood-hazard areas in Willacy County
- Subdivision plats must identify flood-hazard areas and proposed floor elevations.
- If an area is within a floodplain, documentation must explain how it will be removed from the floodplain.
- Floodplain certification and applicable drainage documentation are required in the subdivision checklist.
“Limits of flood hazard areas and the proposed floor elevation of buildings within flood hazard areas on each lot.”
Willacy County Subdivision Plat Checklists ↗Re-checked Sep 26, 2026
Permit processPublished (with conditions)
County permit-submission process in Willacy County
- Permit submissions are listed as occurring Monday through Friday, 8:00am–11:30am and 1:00pm–4:00pm.
- Applications are published for residential/commercial building, electrical, plumbing/gas, mechanical, OSSF, demolition, manufactured-home, moving, and underground/utility permits.
“Permits Submitted to Tax Office: Monday - Friday 8:00am - 11:30am 1:00pm - 4:00pm”
Permits ↗Re-checked Sep 26, 2026
County-wide zoningAbsent
Texas counties have no zoning authority in unincorporated areas; the county's land-use controls are limited to a Floodplain Ordinance and Subdivision Rules & Regulations, with no zoning ordinance.
Willacy County Permits Department ↗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:”
Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 12, 2026
Septic permitRequired
Construction, installation, alteration, extension, or repair of an OSSF in Texas
- A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.
- A 10-acre exemption may apply only if all listed conditions are met: site evaluation by a TCEQ-licensed site evaluator or professional engineer; single-family dwelling on at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; effluent disposed of on the property; and the single-family dwelling is the only dwelling on the tract.
- Emergency repairs listed by TCEQ do not require a permit but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- Grandfathered systems may also be exempt if the stated conditions are met.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other TCEQ conditions must be met) · minimum OSSF distance from property line for 10-acre exemption: >= 100 feet (all parts of the OSSF) · emergency repair reporting deadline: <= 72 hours (after repairs have begun; written report to permitting authority)
“A permit is required to construct, install, alter, extend, or repair an OSSF. [...] An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
Driveway accessRequired
New or modified access driveways connecting property to a Texas state highway right of way.
- A local public agency may receive access driveway permitting authority for state highways, but TxDOT approval remains required for drainage impacts on the state highway system before local approval.
- No access driveway is permitted within a flared or widened right-of-way section at an intersection of a state highway with another highway, road, or street.
- All entrances and exits, including radii, must be confined within the permittee's property frontage.
- One-way 45-to-90-degree driveways are permitted for connections to one-way frontage roads or lane-divided highways; otherwise the driveway angle must be 75 to 90 degrees.
- ADAAG and Texas Accessibility Standards apply.
private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · driveway-to-pavement radius: >= 15 feet
“A driveway must be constructed in accordance with a fully executed driveway permit”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
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.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
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.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026

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 from county construction permitting or inspection
Certificate of occupancy — Certificate-of-occupancy requirements in Willacy County
Local zoning — Aggregate local zoning in Willacy County, including incorporated municipalities and unincorporated areas
Well permit — Private or subdivision water-well permits in Willacy County
Mandatory utility hookup — Water and sewer connection requirements in Willacy County

2 more unanswered

Agricultural exemption
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 Willacy County, Texas

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

Willacy County scores 43/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and low administrative friction for a quiet rural property. Watch-outs: workable self-sufficiency basics (25.3″/yr rainfall) and elevated current hazard exposure.

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

Willacy 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 Willacy County Permits Department (TCEQ authorized agent). 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 Willacy County?

Living in an RV on your own land in Willacy County is allowed: Unincorporated Willacy County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Willacy County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.willacy.tx.us. 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 Willacy County, Texas?

Land in Willacy County runs about $2,789 per acre, based on the latest county data.

What is the water situation in Willacy County?

Willacy County gets about 25.3" of rain a year, with severe drought in roughly 20.2% of years.

How remote is Willacy County?

A typical private-land location has about 17,694 people within 15 miles and 3,390,360 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and septic rules in Willacy County, Texas

At a glance

Who to call

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

Who is the Willacy County building department, and how do you reach them?

Does Willacy County have zoning?

How do septic permits work in Willacy County?

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

Building a home in Willacy County: the steps, in order

What to check before you buy land in Willacy County, Texas

Watch-outs

Sources

Willacy County in Texas

How Willacy County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Willacy County

Willacy County rules

Texas rules that apply here

Still unanswered

Living off-grid in Willacy County, Texas

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

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

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

How much does land cost in Willacy County, Texas?

What is the water situation in Willacy County?

How remote is Willacy County?

How Willacy compares in Texas