Bolthole Index

Colorado County, Texas

Zoning, building permits and septic rules in Columbus, Texas

Columbus, Texas, in Colorado County, has its own zoning ordinance, so zoning inside city limits is decided by the city, not the county1. The city also adopts the 2018 International Building Code and a separate residential code for homes2. Septic permits for Colorado County come from the county's Permit Office, and we could not confirm who handles septic for lots inside the city3.

At a glance

Zoning
Yes, the City of Columbus has a zoning ordinance (Ordinance 96-09)1
Building code
2018 International Building Code and 2018 International Residential Code2
Building permits
Contractors register and apply through the city's online permit portal4
Residential lot size (District R)
At least 5,000 square feet for a one-family dwelling5
Septic permits
Colorado County Permit Office for the county; not confirmed for lots inside city limits3
Floodplain
Floodplain development permit required inside the city6

Who to call

Building permits

City of Columbus, Building Official and Code Enforcement

Building codes, zoning code enforcement, floodplain regulation and the contractor registration and permit application portal for land inside Columbus city limits

979.732.2366

605 Spring, Columbus, TX 78934

Online permits →

Septic permits

Colorado County Permit Office (OSSF/Septic)

Septic (OSSF) permit applications, plan review, fees and final inspections for Colorado County

979/732-2435

305 Radio Lane, Room 108, Columbus, Texas 78934

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

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

Does Columbus, Texas have zoning, and what does it mean for lot size and setbacks?

Yes. The City of Columbus publishes its own zoning ordinance, Ordinance 96-09, which covers land inside city limits1. The rules depend on the zoning district your lot falls in, and the official zoning map shows which one7.

In District R, the single-family or two-family residential district, a one-family dwelling needs a lot of at least 5,000 square feet, and a two-family dwelling needs at least 8,000 square feet5. Single-family lots need at least 50 feet of width at the front street building line5. Setbacks in District R are at least 20 feet in front, 5 feet on the sides and 25 feet in the rear, with different rules for double-frontage lots, carports and two-family homes8.

We could not confirm Columbus's rules on RVs, tiny homes, manufactured homes, accessory dwellings, building height or minimum dwelling size, so ask the city's code enforcement office before you buy4.

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

Inside Columbus city limits, the city, not Colorado County, regulates building. The city adopted the 2018 International Building Code and separately adopted the 2018 International Residential Code for one- and two-family homes2. The city's code enforcement page lists a Building Official for building codes4.

A building permit cannot be issued until the fees on file with the city secretary are paid, and a permit amendment needs any added fee paid first9. The city's page directs contractors to register and upload license and insurance information in its online portal before applying for permits4. We could not confirm the exact residential permit trigger, the inspection schedule or any owner-builder exemption from the city's code, so call the Building Official before you start10.

One state rule helps owner-builders: Texas does not require a state electrician license for electrical work on a dwelling you own and live in11. That does not waive a city permit or inspection11.

Who handles building and permit questions in Columbus, and how do you reach them?

Start with the City of Columbus code enforcement page, which names the Building Official as the contact for building codes and a code enforcement officer for the zoning code4. City Hall is at 605 Spring, Columbus, TX 78934, and the city's phone number is 979.732.23664. Permit applications go through the city's online portal4.

Floodplain questions go to the city too. A floodplain development permit is required inside Columbus, applications are presented to the floodplain administrator on city forms, and the city manager serves as that administrator6.

Subdivision of land inside the city is governed by the city's subdivision ordinance, Article 10.02 of its code12.

How do septic permits work in Columbus, Texas?

Colorado County runs the on-site sewage facility (septic) permit program as a state-authorized agent, and the county's Permit Office reviews planning materials and issues the permit to construct3. The county's fee is $250 for a residential system and $350 for a commercial one, and a soil survey and site evaluation by a licensed site evaluator, registered sanitarian or registered engineer follow the application13. The installer must request a final inspection and cannot cover the system before it14.

We could not confirm whether the county or the city handles septic for a lot inside Columbus city limits, and many in-town lots may connect to city sewer instead, so ask the City of Columbus and the Colorado County Permit Office which applies15.

Soil matters. Only about 2.9% of Colorado County's soils rate as not limited for a conventional drain field, so expect a site evaluation and possibly an engineered system16. Texas's 10-acre exemption needs a single-family home on a tract of at least 10 acres, so it will not apply to a typical city lot17.

Building a home in Columbus: the steps, in order

  1. Confirm the zoning district on the official zoning map and check the lot against the District R minimums if the lot is zoned R75.
  2. Ask the Building Official which permits your project needs; register as a contractor in the city's online portal if a contractor is doing the work4.
  3. Check flood status; a floodplain development permit is required inside the city6.
  4. Ask whether the lot has city sewer or needs a septic permit from the Colorado County Permit Office3.
  5. Pay the permit fees on file with the city secretary before the permit issues9.
  6. If your driveway meets a state highway, you need Form 1058 from the local TxDOT district office18.

What stays with Colorado County, and what should you check before you buy?

Septic permits and, outside the city, development permits sit with the county. For land outside Columbus city limits, see the Colorado County page, because the city's zoning and building rules do not reach unincorporated land.

Wells: the Colorado County Groundwater Conservation District requires every water well within its boundaries to be registered, and new wells must be registered before drilling begins19. We could not confirm whether the district's rules cover a given lot inside the city.

Costs are county-level: Colorado County's effective property tax rate is about 1.1% and the median property tax bill is $2,117 a year2021. A typical home insurance premium there is about $2,485 a year22.

Watch-outs

  • Columbus's code does not publish the residential building permit trigger, an inspection schedule, a certificate-of-occupancy rule or an owner-builder exemption in the material we reviewed, so ask the Building Official before you buy or build10.
  • Rules on RVs, tiny homes, manufactured homes and accessory dwellings inside Columbus city limits were not confirmed; do not assume they are allowed7.
  • Lot size and setback figures here are for District R only; other zoning districts have different standards8.
  • Septic authority for lots inside Columbus city limits was not confirmed; the Colorado County Permit Office runs the county program3.

Sources

  1. ARTICLE 14.02: Zoning Ordinance - City of Columbus, TX (Columbus), quoted and re-checked
  2. ARTICLE 3.02: Building Code - City of Columbus, TX (Columbus), quoted and re-checked
  3. Colorado County On-Site Sewage Facility (OSSF) Permitting Process, quoted and re-checked
  4. City of Columbus, Building Official and Code Enforcement (columbustexas.net)
  5. Part II: District R, Single-Family or Two-Family Residential District - City of Columbus, TX (Columbus), quoted and re-checked
  6. Division 2: Administration - City of Columbus, TX (Columbus), quoted and re-checked
  7. Division 3: District Regulations - City of Columbus, TX (Columbus), quoted and re-checked
  8. Part II: District R, Single-Family or Two-Family Residential District - City of Columbus, TX (Columbus), quoted and re-checked
  9. ARTICLE 3.02: Building Code - City of Columbus, TX (Columbus), quoted and re-checked
  10. ARTICLE 3.02: Building Code - City of Columbus, TX (Columbus), quoted and re-checked
  11. Exemptions to Electrician Licensing (Texas statewide rule), quoted and re-checked
  12. City of Columbus, TX Subdivisions (Columbus), quoted and re-checked
  13. Colorado County On-Site Sewage Facility (OSSF) Permitting Process, quoted and re-checked
  14. Colorado County On-Site Sewage Facility (OSSF) Permitting Process, quoted and re-checked
  15. Colorado County Permit Office (OSSF/Septic) (co.colorado.tx.us)
  16. 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
  17. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  18. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  19. Colorado County Groundwater Conservation District Rules & Regulations, quoted and re-checked
  20. Effective property tax rate: Bolthole Index county data
  21. Median property tax bill: Bolthole Index county data
  22. Typical home insurance premium: 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 Columbus

Columbus’s own rules

  • Building code adoptedAdopted (with conditions)

    Property, buildings, and structures inside Columbus city limits; the residential code separately governs single- and two-family residential properties.

    • The International Building Code adoption includes appendix chapters C–N except A and B and amendments that become an official part of the code.
    • parameters are not a substitute for the separately adopted International Residential Code for single- and two-family properties.

    International Building Code edition: 2018 (Appendix chapters C–N included; appendices A and B excluded.) · International Residential Code edition: 2018 (Appendix chapters A–K and M–T included; appendix L excluded.)

    “International Building Code, 2018 edition”
  • Local zoningPresent (with conditions)

    Land inside Columbus city limits.

    • The published zoning ordinance is Ordinance 96-09, adopted May 14, 2009, as enacted and amended.
    “This article consists of the zoning ordinance, Ordinance 96-09 adopted 5/14/09.”
  • Zoning districtsPublished (with conditions)

    Zoning districts inside Columbus city limits.

    • District applicability depends on the official zoning map and the applicable district regulations.
    “Part II District R, Single-Family or Two-Family Residential District”
  • Subdividing landRegulated (with conditions)

    Subdivision activity inside Columbus city limits.

    • The published code contains Article 10.02, titled Subdivision Ordinance; detailed application standards were not extracted.
    “ARTICLE 10.02 SUBDIVISION ORDINANCE (§ 10.02.001 – § 10.02.213)”
  • Building in a floodplainRequired

    Floodplain development inside Columbus city limits.

    • Application is presented to the floodplain administrator on city forms and may include duplicate scale plans.
    • The city manager is the floodplain administrator.
    • The article provides variance procedures and floodplain-development standards.
    “A floodplain development permit shall be required to ensure conformance with the provisions of this article.”
  • Permit feesVariable (with conditions)

    City building permits inside Columbus city limits.

    • A permit cannot issue until fees on file with the city secretary are paid.
    • An amended permit cannot be approved until an additional fee due to increased estimated installation cost is paid.
    “A permit shall not be issued until the fees [...] have been paid.”
  • Permit processPartial

    City building permits inside Columbus city limits.

    • The opened code publishes a payment condition but not the complete application procedure or fee schedule.
    “No amendment to a permit shall be approved”

Rules another office applies inside Columbus

Columbus 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

    District R, Single-Family or Two-Family Residential District, inside Columbus city limits.

    • Lots in separate ownership on the effective date of the article may be used as stated in § 14.02.433(b)(4); a two-family dwelling on such a lot may not be on less than 6,000 square feet.

    one-family dwelling minimum lot area: >= 5000 square feet · two-family dwelling minimum lot area: >= 8000 square feet (Existing separately owned lots are subject to § 14.02.433(b)(4).) · single-family minimum lot width at front street building line: >= 50 feet (Average width must not be less than 60 feet.)

    “No two-family dwelling shall be constructed on any lot of less than 8,000 square feet.”
  • SetbacksSpecified

    District R, Single-Family or Two-Family Residential District, inside Columbus city limits.

    • Double-frontage lots require the front yard on both streets.
    • Carport exceptions and different side-yard dimensions apply as specified in § 14.02.433(a).

    front yard depth: >= 20 feet (Double-frontage and carport provisions apply.) · side yard width: >= 5 feet (Two-family, side-street, and allowable nonresidential uses have different stated minimums.) · rear yard depth: >= 25 feet

    “In the R district, there shall be a front yard”

Still unanswered

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

  • Building permit — Residential construction inside Columbus city limits.
  • Owner-builder exemption — Owner-built residential construction inside Columbus city limits.
  • Inspections — Residential construction inside Columbus city limits.
  • Certificate of occupancy — Residential occupancy inside Columbus city limits.
  • Minimum dwelling size — District R, Single-Family or Two-Family Residential District, inside Columbus city limits.
16 more unanswered
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • 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 Columbus publishes no rule on the point, not that none exists. Colorado County’s page lists the county offices to call.

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