Bolthole Index

Bexar County, Texas

Building permits, zoning and septic rules in Kirby, Texas

Kirby, Texas directs homeowners to contact the city before starting new construction or renovations and requires a building permit before permitted work begins.12 Kirby has its own zoning; Bexar County handles septic permitting, while Kirby also sets subdivision septic standards.345

At a glance

Building permits
Apply through Kirby; submitting an application does not authorize work.2
Zoning
Kirby publishes its own zoning map.3
Septic permits
Bexar County permits septic systems; Kirby subdivision requirements also apply.45
Residential lot size
In R-1, minimum internal lots are 5,000 square feet and corner lots 6,000 square feet.6
Public water
Connection required for covered buildings abutting a street or alley with a public water line, or within 200 feet of the line.7
RV and tiny-home living
We could not confirm occupancy permission; ask Kirby City Hall about the proposed use and zoning district.3

Who to call

Building permits

Kirby City Hall — Building Applications and Zoning

Kirby building applications; contact City Hall for plan requirements and routing of zoning questions.

(210) 661-3198

112 Bauman Street Kirby, Texas 78219

Online permits →

Septic permits

Bexar County Environmental Services

County septic permits, renewals and installation inspections, including systems inside Kirby.

210-335-6700

612 Nogalitos San Antonio, TX 78204

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

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

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Do you need a building permit in Kirby, TX?

Kirby’s building application says that filing the application does not constitute permission to begin work, and starting without a building permit triggers an investigation fee equal to the permit fee.2 Contact Kirby before beginning new development or renovations, rather than relying on the county’s residential construction rules.1 For land outside city limits, read the Bexar County guide: single-family residential permitting in unincorporated Bexar County is voluntary.8 That county rule is expressly limited to unincorporated land.8

Who handles building applications in Kirby, and what should you submit?

Kirby City Hall’s building application directs applicants to call (210) 661-3198 ext. 7 about plan requirements and states that all new construction requires complete plans.2 Kirby’s development page lists building inspection, plumbing, electrical, mechanical and right-of-way user applications, plus a certificate-of-occupancy application.1 Applicants must attach supporting documents: contractor license, liability insurance or surety bond, and plan drawings showing the scope of work.1 Ask City Hall for the current building fee, required inspection stages and whether a certificate of occupancy applies to your project; we could not confirm those project-specific requirements.1

Does Kirby have zoning, and what are the residential lot limits?

Kirby has municipal zoning and publishes a zoning map, so ask City Hall to identify the parcel’s district before choosing a home design.3 In Kirby’s R-1 Single Family Dwelling District, minimum lot area is 5,000 square feet for an internal lot and 6,000 square feet for a corner lot, with no more than 8 dwelling units per gross acre.6 Kirby’s R-3 Manufactured Home Dwelling District has the same lot-area and density limits.9 These are district-specific requirements; ask City Hall for the applicable setbacks and allowable uses for the parcel rather than treating a lot-area minimum as complete development approval.3

How do septic permits work inside Kirby?

Bexar County requires septic permits for on-site sewage facilities throughout the county, including Kirby, and inspects septic installations at various points during construction.410 Kirby adds a subdivision condition: the city cannot issue a septic-tank permit for a subdivision lot unless the final plat is approved and recorded and subdivision standards are fully satisfied.5 Kirby’s City Engineer also has authority to set sewage-disposal, septic-tank and water-well standards.11 For an existing standard septic system, Bexar County requires renewal every 5 years, a tank-pumping receipt and a $30 renewal fee.12 Contact county Environmental Services and Kirby before designing a new system.1311

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

We could not confirm a general right to occupy an RV or tiny home on private land inside Kirby; ask City Hall for a determination covering your proposed dwelling and the parcel’s zoning district.3 We also could not confirm a separate accessory dwelling allowance, temporary-camping permission or a minimum dwelling floor area for Kirby.3 Water arrangements are a separate constraint: Kirby requires covered occupied buildings to connect to a public water line when abutting a street or alley containing the line, or when within 200 feet of the line.7 An off-grid plan therefore needs a water-connection review as well as an occupancy answer.7

What are the steps to building a home in Kirby?

First, ask Kirby City Hall to confirm the zoning district and review the proposed use before starting work.31 Next, assemble the building application, scope-of-work drawings and required contractor supporting documents, then obtain the building permit before beginning permitted work.12 Resolve water service early: Kirby’s connection fees are on file in the City Secretary’s office and are collected when building permits are issued.7 If the parcel will use septic, coordinate Bexar County’s septic permit with Kirby’s subdivision requirements before installation.125 Ask City Hall to specify inspection stages and occupancy requirements for the approved project.1

Watch-outs

  • Kirby’s building application warns that starting work without a building permit adds an investigation fee equal to the permit fee.2
  • Kirby’s water-connection requirement can affect plans for independent water supply; ask City Hall to review the public-line location before committing to a well.7
  • We could not confirm Kirby’s RV, tiny-home or temporary-camping occupancy rules; ask City Hall before buying land for those uses.3

Sources

  1. Development - The City of Kirby Texas (Kirby), quoted and re-checked
  2. Kirby City Hall — Building Applications and Zoning (kirbytx.org)
  3. Development - The City of Kirby Texas (Kirby), quoted and re-checked
  4. On-Site Sewage Facilities, quoted and re-checked
  5. library.municode.com (Kirby), quoted and re-checked
  6. § 153.016 - R-1 Single Family Dwelling District (Kirby), quoted and re-checked
  7. § 53.01 - When Connections Required; Fees (Kirby), quoted and re-checked
  8. Fire Marshal - New Construction FAQs, quoted and re-checked
  9. § 153.018 - R-3 Manufactured Home Dwelling District (Kirby), quoted and re-checked
  10. On-Site Sewage Facilities, quoted and re-checked
  11. § 152.96 - Authority of City Engineer (Kirby), quoted and re-checked
  12. On-Site Sewage Facilities, quoted and re-checked
  13. Bexar County Environmental Services (bexar.org)

Written October 11, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Kirby

Kirby’s own rules

  • Local zoningPresent

    Kirby city land subject to the city's zoning ordinance.

    • The city's official development page publishes a zoning map and directs applicants to city development requirements.
    “DO NOT BEGIN ANY WORK WITHOUT CONTACTING THE CITY OF KIRBY FOR NEW DEVELOPMENT AND RENOVATION REQUIREMENTS”
  • Minimum lot sizeSpecified

    R-1 Single Family Dwelling District inside Kirby city.

    • Internal lot: 5,000 square feet.
    • Corner lot: 6,000 square feet.
    • Density may not exceed 8 dwelling units per gross acre.

    internal lot area: >= 5000 square feet · corner lot area: >= 6000 square feet · maximum density: <= 8 dwelling units per gross acre

    “Minimum lot area: (a) Internal: 5,000 square feet. (b) Corner: 6,000 square feet. (c) No R-1 development shall exceed a density of more than 8 dwelling units per gross acre.”
    One more reviewed finding on this topic
    • Specified — R-3 Manufactured Home Dwelling District inside Kirby city.
      “Minimum lot area: (a) Internal lot: 5,000 square feet. (b) Corner lot: 6,000 square feet. (c) No R-3 development shall exceed a density of more than 8 dwelling units per gross acre.”
  • Building heightSpecified

    R-2 Multi Family Dwelling District inside Kirby city.

    maximum structure height: 45 feet or 3 stories, whichever is less

    “Maximum height of structures: 45 feet or 3 stories, whichever is less.”
    One more reviewed finding on this topic
  • Who permits septicMixed (with conditions)

    Subdivision sewage disposal, septic tanks, and related standards inside Kirby city.

    • Kirby's City Engineer promulgates local standards for sewage disposal systems, septic tanks, and water wells.
    • For a sanitary sewage disposal system in a subdivision, plans must be approved by the State Health Department before final-plat approval.
    “The City Engineer is hereby authorized and directed to promulgate rules, regulations, standards and specifications for the construction, installation, design, location and arrangement of streets, curbs, street lights, street signs, alleys, utility layouts, utility easements, gates for utility easement, sidewalks, water supply and water distribution systems, fire hydrants, sewage disposal systems, septic tanks, water wells, monuments, criteria for drainage, easement requirements, drainage, facilities and crosswalk ways.”
  • Septic permitLimited

    Septic-tank installation on lots in subdivisions inside Kirby city.

    • No city septic-tank permit may issue unless the subdivision final plat has been approved and filed for record.
    • The subdivision standards must have been fully satisfied.
    “No permit shall be issued by the city for the installation of septic tanks upon any lot in a subdivision for which a final plat has not been approved and filed for record, or upon any lot in a subdivision in which the standards contained herein or referred to herein have not been complied with in full.”
  • Mandatory utility hookupConditional

    Residences, businesses, and other occupied or employed places inside Kirby city.

    • Connection is required when the property abuts a public street or alley containing a public water supply line or is within 200 feet of that line.
    • The connection must be made in the most direct manner possible and include a meter and meter box.
    • Connection fees are on file in the City Secretary's office and are collected at building-permit issuance.

    maximum distance from public water supply line: <= 200 feet (Applies when the building is not abutting a street or alley containing a public water supply line.)

    “Every residence, place of business, or other building or place where people reside, congregate or are employed which abuts a public street or alley containing a public water supply line or within 200 feet of such public water supply line shall be connected to such public water supply line in the most direct manner possible, together with a meter and meter box. The connection fees, which are on file in the City Secretary's office, shall be collected by the city. Connection fees shall be paid at the time building permits are issued and all funds collected shall be deposited in the water system fund.”
  • Permit processPublished (with conditions)

    Kirby development and renovation permit process.

    • Applicants are instructed to contact the city before beginning work.
    • The development page lists building inspection, plumbing, electrical, mechanical, right-of-way user, and certificate-of-occupancy applications.
    • Supporting documents include contractor license, liability insurance or surety bond, and plan drawings including scope of work.
    “ATTENTION: All applicants please attach all supporting documents (Contractor license, liability insurance/surety bond and plan drawing to include scope of work) to application”

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemptions from Kirby construction permits.
  • Inspections — Building inspection requirements inside Kirby city.
  • Certificate of occupancy — Certificates of occupancy inside Kirby city.
  • Minimum dwelling size — R-1 Single Family Dwelling District inside Kirby city.
  • Camping on your land — Temporary camping on private land inside Kirby city.
8 more unanswered
  • Tiny homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Short-term rentals
  • Permit fees

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 Kirby publishes no rule on the point, not that none exists. Bexar County’s page lists the county offices to call.

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