Bolthole Index

Travis County, Texas

Building permits, zoning and septic rules in Lago Vista, Texas

Lago Vista, Texas (Travis County) requires a city permit for new construction and major remodels, applied for through the City's MGO Project Permitting Portal1. The City also has its own zoning, handled by its Development Services Department2. Travis County's unincorporated-land rules do not apply inside city limits. We could not confirm who issues septic permits inside the city, so ask Development Services before you buy3.

At a glance

Building permit
Required for new construction and major remodels inside city limits1
Zoning
The City has its own zoning ordinance2
Building code
2021 International Building and Residential Codes, with City amendments4
Owner-builder
Conditional: owner's primary residence, with documentation and an affidavit5
Water
Connection to City water required when supply is within 300 feet and no well is in use6
Septic
Not confirmed inside city limits; ask Development Services3

Who to call

Building permits

City of Lago Vista Development Services

Building permits, inspections, subdivision plats, zoning matters and certificate of occupancy changes inside Lago Vista city limits

512-267-5259

5803 Thunderbird St Suite 101 Lago Vista, TX 78645

Online permits →

Septic permits

Travis County Development Services - On-Site Sewage Facility (OSSF) Program

Septic permits and inspections in unincorporated Travis County; a useful second call for septic questions, but not confirmed as the office for addresses inside Lago Vista

512-854-4438

700 Lavaca, Suite 540, Austin, TX 78701

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

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Do you need a building permit in Lago Vista, Texas?

Yes. Lago Vista requires new construction projects and major remodels inside city limits to apply for a permit, and the City directs applicants to its MGO Project Permitting Portal1. Most applicants must register with the City first, a rule in effect since January 20237.

The City has adopted the 2021 International Building Code, the 2021 International Residential Code and the 2021 International Fire Code, with its own amendments4. Work that needs a permit is inspected by the City or its agents, and covered work must be inspected before it is closed up8.

Who issues building permits in Lago Vista, and how do you reach them?

The City of Lago Vista's Development Services Department handles building permits, inspections, subdivision plats, zoning matters and certificate of occupancy changes3. The office is at City Hall, 5803 Thunderbird St Suite 101, Lago Vista, TX 78645, and the phone is 512-267-52593.

Inside Lago Vista, send building questions here rather than to Travis County's permit counter; the county's development permit applies outside city limits. Applications are filed online through the MGO portal7.

Does Lago Vista have zoning, and what does it mean for RVs, tiny homes and setbacks?

Yes. Every residential building in Lago Vista must conform to the City's building regulations and to Chapter 14, the Lago Vista Zoning Ordinance2. Zoning-related matters go through Development Services3.

We could not confirm the district-specific minimum lot size, minimum dwelling size, setbacks, lot coverage or height limits, or the rules for RV living, tiny homes, manufactured homes and accessory dwellings inside the city. Ask Development Services which district a lot is in and what that district allows before you make an offer. Travis County has no county zoning, but that applies only to unincorporated land and says nothing about lots inside Lago Vista.

How do septic permits work inside Lago Vista?

We could not confirm which agency issues septic permits, or what the inspection rules are, for lots inside Lago Vista city limits. Call Development Services to ask whether a lot must connect to City sewer or may use a septic system3.

Travis County's On-Site Sewage Facility program permits septic systems in unincorporated Travis County9, and its inspection team can be reached at 512-854-443810. Whether it also covers an address inside the city is a question to settle with the City first. Septic soil ratings are county-level: only a small share of Travis County soils rate as not limited for a conventional drain field11, so expect a site evaluation.

What are the owner-builder rules and water rules in Lago Vista?

Lago Vista allows property owners to obtain permits for work on their primary residence if the home is exempt from state and local ad valorem taxes, with documentation and an affidavit naming contractors in good standing with the City5. Work that requires a state license is outside that exception5.

A new structure used for human habitation that is not on a water well must connect to City water if the supply is within 300 feet, measured in the street right-of-way or a utility easement to the nearest property line6. Once connected, a habitation structure may not be disconnected6. We could not confirm whether the City requires a permit for a private well.

Building a home in Lago Vista: the steps, in order

  1. Ask Development Services which zoning district the lot is in and what that allows3.
  2. Confirm the lot sits on a public or platted private street, which a single-family home requires12.
  3. Check whether City water is within 300 feet6.
  4. Ask Development Services how sewage is handled for the lot3.
  5. Register with the City and apply through the MGO portal7.
  6. Schedule inspections as work proceeds8.
  7. Pass final inspection; the certificate of occupancy is not issued until all fees are paid13.

What to check before you buy land in Lago Vista

Confirm the lot is inside city limits, since city and county rules differ. Land outside the limits falls under the Travis County page. Property tax figures are county-level: Travis County's effective property tax rate is 1.5%14. Ask Development Services about the lot's zoning district, sewer or septic, and street access before closing3.

Watch-outs

  • We could not confirm who issues septic permits inside Lago Vista city limits; ask Development Services before you buy3.
  • We could not confirm the City's current building permit fee schedule; a certificate of occupancy is held until all fees are paid13.
  • We could not confirm Lago Vista's rules for RV living, tiny homes or short-term rentals; ask Development Services3.

Sources

  1. Permitting | Lago Vista, TX (Lago Vista), quoted and re-checked
  2. Development Services | Lago Vista, TX (Lago Vista), quoted and re-checked
  3. City of Lago Vista Development Services (lagovistatexas.gov)
  4. CHAPTER 3 - BUILDING REGULATIONS | Code of Ordinances | Lago Vista, TX | Municode Library (Lago Vista), quoted and re-checked
  5. CHAPTER 3 - BUILDING REGULATIONS | Code of Ordinances | Lago Vista, TX | Municode Library (Lago Vista), quoted and re-checked
  6. CHAPTER 3 - BUILDING REGULATIONS | Code of Ordinances | Lago Vista, TX | Municode Library (Lago Vista), quoted and re-checked
  7. Permitting | Lago Vista, TX (Lago Vista), quoted and re-checked
  8. CHAPTER 3 - BUILDING REGULATIONS | Code of Ordinances | Lago Vista, TX | Municode Library (Lago Vista), quoted and re-checked
  9. On-Site Sewage Facility (Septic System) Permit (2026 county census)
  10. Travis County Development Services - On-Site Sewage Facility (OSSF) Program (traviscountytx.gov)
  11. 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
  12. CHAPTER 3 - BUILDING REGULATIONS | Code of Ordinances | Lago Vista, TX | Municode Library (Lago Vista), quoted and re-checked
  13. CHAPTER 3 - BUILDING REGULATIONS | Code of Ordinances | Lago Vista, TX | Municode Library (Lago Vista), quoted and re-checked
  14. 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 Lago Vista

Lago Vista’s own rules

  • Building permitRequired

    New construction projects and major remodels inside Lago Vista city limits.

    • Most permits require applicant registration with the City as of January 1, 2023.
    • The City directs applicants to use its MGO Project Permitting Portal.
    “To ensure development occurs according to the Lago Vista Municipal Code and accepted safety standards, we require that new construction projects and major remodels apply for a permit. The MGO Project Permitting Portal is where to submit your permit request.”
  • Owner-builder exemptionConditional

    Property-owner permit work on the owner's primary residence inside Lago Vista city limits.

    • The residence must be exempt from state and local ad valorem taxes.
    • Proper documentation and an affidavit identifying contractors with City registration records in good standing are required.
    • Work requiring a state license is not within the stated owner-performed exception.
    “Property owners can obtain permits for work on their primary residence that is exempt from state and local ad valorem taxes with proper documentation and an affidavit that identifies the contractors with a registration record in good standing with the City of Lago Vista.”
  • Building code adoptedAdopted (with conditions)

    Buildings and structures inside Lago Vista city limits.

    • The City code lists amendments, clarifications, and excluded appendices and provisions.
    • The City states it will not enforce an ordinance restricting a building material or method otherwise permitted by an adopted model building code after September 1, 2019.

    adopted building codes: 2021 International Building Code; 2021 International Residential Code; 2021 International Fire Code; 2021 Existing Building Code; NFPA 101 (Subject to the City's stated requirements, amendments, and clarifications.)

    “This section contains the building code for the city. The 2021 International Building Code, the 2021 International Residential Code, the 2021 International Fire Code, the 2021 Existing Building Code, and the 2021 National Fire Protection Association's Life Safety Code (NFPA 101) are hereby adopted and made part of this article with the following requirements, amendments, and clarifications:”
  • InspectionsRequired

    Construction or work requiring a permit inside Lago Vista city limits.

    • No work may cover work requiring inspection until proper inspection occurs.
    • The City requires final inspection and approval when the building or structure is completed.
    “All construction or work for which a permit is required shall be subject to inspection by the city or its agent(s).”
  • Certificate of occupancyRequired

    Buildings subject to the City's final approval and certificate-of-occupancy inspection inside Lago Vista city limits.

    • The building inspector performs a certificate-of-occupancy inspection upon final approval.
    • The certificate is not issued until all fees, including assessed re-inspection fees, are paid.
    “Upon obtaining final approval, the city building inspector will perform a certificate of occupancy inspection. However, the Certificate of Occupancy shall not be issued until all fees are paid, including any assessed re-inspection fees.”
  • Local zoningPresent (with conditions)

    Land inside Lago Vista city limits.

    • The City's Development Services Department processes zoning-related matters and enforces City ordinances.
    “Every building, structure, or part thereof erected or altered, or used for residential use in the city containing one or more dwelling units shall conform to the provisions of this article and Chapter 14, the Lago Vista Zoning Ordinance.”
  • Mandatory utility hookupWater (with conditions)

    New structures used for human habitation or occupancy inside Lago Vista city limits.

    • The structure must not be using a water well at time of permitting.
    • The City water supply must be within 300 feet measured within street right-of-way or a utility easement from supply to nearest property line.
    • After a habitation structure connects to City water it may not be disconnected.
    • Harvested rainwater remains allowed for non-domestic use.

    water-service proximity: <= 300 feet (Measured within street ROW or utility easement from water supply to nearest property line.)

    “Effective, March 1, 2013, all new structures utilized for human habitation or occupancy that are not utilizing a water well at the time of permitting shall connect to a city water supply if such supply is within 300 feet as measured within street ROW or a utility easement from the water supply to the nearest property line on which the structure is to be located.”
  • Subdividing landRegulated (with conditions)

    Subdivision plats and related development inside Lago Vista city limits.

    • Development Services receives and processes subdivision plats.
    “Development services receives and processes all building related permits, manages inspections, subdivision plats, zoning - related matters, business licenses, certificate of occupancy changes and more.”
  • Driveway accessRequired

    Single-family dwellings inside Lago Vista city limits.

    • The dwelling must be on a lot abutting a public or platted private street.
    • Multifamily dwellings require public-street or paved-private-street access.
    • A planned development district may explicitly exempt itself when stated architectural conditions apply.
    “Each single-family dwelling unit in the city shall be on a lot abutting a public or platted private street. Multifamily dwellings, including patio homes, condominiums and townhouse projects, shall have access to a public street or a paved private street.”
  • Permit processPublished (with conditions)

    New construction projects and major remodels inside Lago Vista city limits.

    • Applicants use the MGO Project Permitting Portal.
    • The City describes an interactive permit guide that requires an account and project questions.
    • Most permit applicants must be registered with the City as of January 1, 2023.
    “Create an account, Answer the questions about your project and Receive a custom step-by-step guide to permitting your project.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Lago Vista or Travis County directly.

  • Minimum dwelling size — Residential dwellings inside Lago Vista city limits.
  • Minimum lot size — Residential lots inside Lago Vista city limits.
  • Setbacks — Residential structures inside Lago Vista city limits.
  • Lot coverage — Residential lots inside Lago Vista city limits.
  • Building height — Residential structures inside Lago Vista city limits.
13 more unanswered
  • 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
  • Agricultural exemption
  • 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 Lago Vista publishes no rule on the point, not that none exists. Travis County’s page lists the county offices to call.

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