Bolthole Index

Hidalgo County, Texas

Zoning, building permits and septic rules in Alamo, Texas

The City of Alamo, Texas (Hidalgo County) has its own zoning and adopts its own building code, so construction inside city limits needs a city building permit12. A parked RV may not be hooked up to utilities or lived in3. Septic is the thin spot: the city's rules cover subdivisions, and we could not confirm who permits a single-lot septic system. Outside city limits, Hidalgo County has no zoning4.

At a glance

Zoning
Yes, the City of Alamo zones land inside city limits1
Building permit
Required for covered work inside city limits; starting early doubles the fee2
Building code
International Building Code 2024 edition, with local amendments5
Septic
Subdivision septic needs written TCEQ approval; designs are not approved on lots under one-half acre67
RV living
A parked RV may not be connected to utilities or lived in3
Mobile homes
One mobile home per lot is a listed use in the R-MH district8
Sewer hookup
Required within 90 days of notice if the property line is within 50 feet of active city sewer9
Property tax (Hidalgo County)
Effective rate of 1.8%10

Who to call

Building permits

City of Alamo Planning and Development Department

Building codes, zoning ordinance and building-related questions inside Alamo city limits (option 4 on the main city line)

787-0006

Septic permits

Hidalgo County Health & Human Services – Environmental Health (OSSF)

County septic (OSSF) permit applications; the county's own rules apply outside incorporated municipalities, so ask whether they reach a given Alamo lot

Planning & zoning

Hidalgo County Planning Department (Permitting Division)

Development permits and utility clearances for unincorporated Hidalgo County, outside Alamo city limits

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 Alamo means bringing your own water and power. The kit we’d start with:

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Does Alamo, Texas have zoning, and what does it mean for RVs and mobile homes?

Yes. The City of Alamo adopts zoning regulations and districts made under its Comprehensive Plan, and they apply to land inside Alamo city limits1. The city's zoning ordinance covers every property inside city limits, and the Planning and Development Department is the office to call11.

For RVs, the rule is strict: a parked RV in Alamo may not be connected to utilities or lived in, even temporarily or overnight3. Mobile homes are handled by district: the R-MH Mobile Home and Modular Home District lists one mobile home, one travel trailer or one modular home per lot as a residential use, and district and subdivision requirements still control8.

We could not confirm lot sizes, setbacks, height limits or the rules for tiny homes and accessory dwellings in Alamo's residential districts. Ask the Planning and Development Department for the district table before you buy11.

Do you need a building permit in Alamo, Texas, and who issues it?

Yes, the City of Alamo requires a permit for work covered by its building code, including moving structures2. Alamo has adopted the International Building Code 2024 edition, subject to local amendments5. Starting covered work before the permit is issued doubles the permit fee2.

The city publishes a fee formula for new single-family through fourplex construction: $0.32 per square foot, plus an inspection fee, a curb cut and a RES-Check energy report12. Other formulas apply to additions, remodels and nonresidential work12.

Call the Planning and Development Department for building questions11. We could not confirm a general inspection sequence or an owner-builder exemption for Alamo, so ask the city before you assume either.

How do septic permits work inside Alamo, Texas?

Alamo steers properties toward city sewer. A building that is used, lived in or has an active water meter, and whose property line is within 50 feet of active city sanitary sewer, must get the plumbing permit and connect within 90 calendar days after notice9.

Where a subdivision proposes its own septic systems, written approval from the Texas Commission on Environmental Quality (TCEQ) is required before final-plat approval6. The city will not approve septic tank designs on lots under one-half acre7. The City Engineer can prohibit soil-absorption systems after review by the City or County Health Officer7.

Who issues the permit for a single septic system on one Alamo lot, we could not confirm. Hidalgo County's septic program applies outside incorporated municipalities13, so call the City of Alamo first11, then the county's Environmental Health office14. Texas allows a septic permit exemption only for a single-family home on a tract of at least 10 acres that meets every TCEQ condition15; a typical city lot will not qualify.

Building a home in Alamo, Texas: the steps, in order

  1. Confirm the parcel is inside Alamo city limits, and find its zoning district with the Planning and Development Department11.
  2. Check whether city sewer is within 50 feet of the property line; if it is, plan to connect9.
  3. If you are subdividing, remember that no land may be subdivided or used without complying with the city's subdivision title16.
  4. Get the city building permit before work starts, because starting early doubles the fee2.
  5. Build to the city's adopted International Building Code 2024 edition5.
  6. Where a property sits in both the city's sewer service area and Military Highway Water Supply Corporation's water service area, pay the $150 sewer deposit, because no inspections, final occupancy or certificate of occupancy are issued until it is paid17.

What stays with Hidalgo County, and what should you check before you buy in Alamo?

Land outside Alamo city limits falls under unincorporated Hidalgo County rules, which are different: the county says it has no zoning authority under the Texas Local Government Code4, and it requires a development permit for any structure under county jurisdiction18. See the Hidalgo County page for those rules.

A driveway onto a Texas state highway needs a TxDOT permit, applied for with Form 105819.

Hidalgo County's effective property tax rate is 1.8%10. We could not confirm floodplain rules, well permits or short-term rental rules inside Alamo, so ask the city before you buy.

Watch-outs

  • Do not park an RV on an Alamo lot and plan to live in it: parked RVs may not be connected to utilities or residentially occupied inside city limits3.
  • Starting construction before the city permit is issued doubles the permit fee2.
  • Unincorporated Hidalgo County ended development permits and utility clearances for RVs, travel trailers and motor homes used as primary residences in 202520.
  • We could not confirm setbacks, minimum lot sizes, floodplain rules or who permits a single-lot septic system inside Alamo; call the Planning and Development Department before you commit11.

Sources

  1. 10-1-2: Purpose (Alamo), quoted and re-checked
  2. 9-1-3: Building Code Permit Fees (Alamo), quoted and re-checked
  3. 6-3-8: Parking of Certain Vehicles Restricted (Alamo), quoted and re-checked
  4. Fair Housing Activity Statement – Texas, quoted and re-checked
  5. 9-1-1-1: Building Code (Alamo), quoted and re-checked
  6. 11-3-8: Sewer Facilities and Waste Disposal (Alamo), quoted and re-checked
  7. 11-3-8: Sewer Facilities and Waste Disposal (Alamo), quoted and re-checked
  8. 10-11-2: Permitted Uses (Alamo), quoted and re-checked
  9. 8-2-2: Sanitary Disposal Requirements (Alamo), quoted and re-checked
  10. Effective property tax rate: Bolthole Index county data
  11. City of Alamo Planning and Development Department (alamotexas.org)
  12. 9-1-3: Building Code Permit Fees (Alamo), quoted and re-checked
  13. Hidalgo County Permitting Procedures, quoted and re-checked
  14. Hidalgo County Health & Human Services – Environmental Health (OSSF) (hidalgocounty.us)
  15. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  16. 11-1-8: Compliance With Provisions (Alamo), quoted and re-checked
  17. 8-2-2: Sanitary Disposal Requirements (Alamo), quoted and re-checked
  18. Construction Permit, quoted and re-checked
  19. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  20. Hidalgo County Planning Department (Permitting Division) (hidalgocounty.us)

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 Alamo

Alamo’s own rules

  • Building permitRequired

    Work, including moving structures, for which a permit is required under Alamo Title 9.

    • Starting or proceeding with covered work before obtaining the permit doubles the permit fee.
    “In case any work, including moving structures, for which a permit is required by this chapter is started or proceeded with prior to obtaining such permit, the fee for such permit shall be doubled.”
  • Building code adoptedAdopted (with conditions)

    Building construction inside Alamo city limits.

    • Subject to amendments specified in subsection B of § 9-1-1-1.

    building code edition: International Building Code 2024 edition (Subject to local amendments.)

    “The International Building Code 2024 edition is hereby adopted for the purposes expressed in said Code, with consideration given to any amendments specified in (B) below.”
  • Certificate of occupancyLimited

    Structures in Alamo's sanitary-sewer CCN that are also within Military Highway Water Supply Corporation's water CCN.

    • The $150 sanitary-sewer deposit must be paid before inspections, working clearance, final approval, final occupancy, or a certificate of occupancy.
    • The excerpt does not establish a citywide certificate-of-occupancy requirement.

    sanitary sewer deposit: 150 USD (Applies to properties located in both specified CCNs.)

    “there shall be no inspections, no working clearance, no final approval, no final occupancy, and certainly no ‘Certificate of Occupancy’ issued without the City of Alamo first obtaining full payment of the required sewer deposit fee.”
  • Local zoningPresent (with conditions)

    Land inside Alamo city limits.

    • Zoning regulations and districts are made in accordance with the City's Comprehensive Plan.
    “The zoning regulations and districts as herein established have been made in accordance with a Comprehensive Plan”
  • Zoning districtsPublished (with conditions)

    Zoning districts inside Alamo city limits.

    • The reviewed adopted code expressly includes the R-MH Mobile Home and Modular Home District; other district chapters were not fully enumerated in this review.
    “CHAPTER 11 R-MH MOBILE HOME AND MODULAR HOME DISTRICT”
  • Living in an RVLimited

    Recreational vehicles in Alamo city limits.

    • A parked RV may not be connected to utilities or residentially occupied.
    • In the R-MH district, one travel trailer per lot is listed as a residential permitted use; site and district requirements still apply.
    “Any parked RV shall not be connected to utilities (electrical/electrical extension/water/sewer), or residentially used or occupied, either temporarily, overnight, or in any other manner.”
  • Who permits septicMixed (with conditions)

    Proposed separate sanitary sewage disposal systems in subdivisions inside Alamo city limits.

    • TCEQ written approval is required before final-plat approval.
    • The City Engineer and City/County Health Officer have roles in review of soil-absorption systems.
    “If a separate sanitary sewage disposal system is proposed, it must be approved, in writing, by the Texas Commission on Environmental Quality (TCEQ) prior to approval of the final plat.”
  • Septic permitLimited

    Separate sanitary sewage disposal systems proposed with subdivision final plats inside Alamo city limits.

    • Written TCEQ approval is required before final-plat approval.
    • The approval must be presented to the City and City Engineer.
    “These written approvals shall be presented to the City and City Engineer.”
  • Off-grid sanitationLimited

    Septic systems proposed in new subdivisions inside Alamo city limits.

    • No septic design may be approved on a lot under one-half acre.
    • The City Engineer may prohibit soil-absorption facilities based on City and/or County Health Officer review.
    • Plat and deed restrictions are required for subdivisions using septic tanks.

    minimum lot area for City septic design approval: >= 0.5 acre (Applies to septic-tank-system installation designs in subdivisions.)

    “No designs shall be approved by the City for installation of septic tank systems on lots less than one-half (½) acre.”
  • Mandatory utility hookupSewer (with conditions)

    Buildings used, resided in, or having an active water meter inside Alamo where active sanitary sewer exists and the property line is within 50 feet of it.

    • Applicable plumbing permit required.
    • Connection must occur within 90 calendar days after notice from an assigned city official.
    • Connections within that period are exempt from sewer-tap connection fees, but a reinspection fee may apply.

    distance from active sanitary sewer: <= 50 feet (Property line must be within the distance.) · connection deadline after notice: <= 90 calendar days

    “where the building’s property line is within fifty feet (50') of any such active sewer, is hereby required to secure the applicable plumbing permit and must connect within ninety (90) calendar days after notice”
  • Subdividing landRegulated (with conditions)

    Land subdivision and use within the jurisdiction of Alamo Title 11.

    • Full compliance with Title 11 and other applicable zoning, official-map, health-code, and related regulations is required.
    “No land shall hereafter be subdivided or used without full compliance with the terms of this title and other applicable regulations”
  • Driveway accessLimited

    New residential construction permits inside Alamo city limits.

    • The new-residential permit fee formula includes a curb-cut component.
    • The opened material does not establish a universal driveway permit requirement.
    “Inspection fee + Curb Cut + Res-Check = Total Permit Fee”
  • Permit feesPublished (with conditions)

    New single-family through fourplex residential permits inside Alamo city limits.

    • The listed formula includes inspection fee, curb cut, and RES-Check.
    • Other fees and formulas apply to additions, remodeling, nonresidential work, and other permits.

    new residential base calculation: per 0.32 USD per square foot (Plus inspection fee, curb cut, and RES-Check.)

    “Total Square Feet X $0.32 + [...] Inspection fee + Curb Cut + Res-Check = Total Permit Fee”

Rules another office applies inside Alamo

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

  • Minimum lot sizeSpecified

    Lots proposed for septic-tank-system installation in subdivisions inside Alamo city limits.

    • This is a septic-design approval floor, not a general zoning minimum-lot-size finding.

    minimum lot area: >= 0.5 acre (For City approval of septic-tank-system installation designs.)

    “No designs shall be approved by the City for installation of septic tank systems on lots less than one-half (½) acre.”
  • Manufactured homesLimited

    R-MH Mobile Home and Modular Home District inside Alamo city limits.

    • One mobile home per lot is a listed residential permitted use.
    • Applicable district, subdivision, and development requirements remain controlling.

    mobile homes per lot: 1 home (R-MH district.)

    “One mobile home; or one travel trailer; or one modular home per lot for residential purposes.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Alamo or Hidalgo County directly.

  • Owner-builder exemption — Owner-built residential construction inside Alamo city limits.
  • Inspections — General building construction inside Alamo city limits.
  • Minimum dwelling size — New residential dwellings inside Alamo city limits.
  • Setbacks — Residential structures inside Alamo city limits.
  • Lot coverage — Residential lots inside Alamo city limits.
9 more unanswered
  • Building height
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Building in a floodplain
  • 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 Alamo publishes no rule on the point, not that none exists. Hidalgo County’s page lists the county offices to call.

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