Building permits, zoning and septic rules in Southlake, Texas

At a glance

Building permits

City Building Inspections; confirm the application for your project¹

Zoning

Southlake administers its own zoning ordinance²

Building codes

2021 International Codes with local amendments⁵

Septic systems

Tarrant County Engineering regulates OSSF in Southlake⁴

Sewer connection

Required for qualifying development when the city sewer line is within 100 feet of the property line⁶

Short-term rentals

Residential rentals under 30 days prohibited, subject to the defined leaseback exception⁷

Who to call

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

Do you need a building permit in Southlake, Texas?

Southlake’s building-permit service covers home improvements, new construction, remodeling, pools, electrical work and plumbing; the city says these projects may require a building permit.¹ Southlake uses the 2021 International Codes with local amendments, effective May 1, 2022.⁵ Before ordering plans or starting work, describe the proposed project to Southlake Building Inspections and ask which application applies.¹ We could not confirm the complete permit-exemption list or a city owner-builder exemption; ask Building Inspections about the specific work rather than assuming owner construction is exempt.¹

Who handles Southlake building permits and zoning applications?

For Southlake building permits and inspections, call Building Inspections at 817-748-8236.¹ For Southlake zoning, plats and development applications, call Planning & Development Services at 817-748-8621.⁸ Southlake’s online permitting system supports building permit applications, document uploads, fee payments, application-status checks, review comments and inspection scheduling.¹ Planning applications include zoning changes, site plans, plats and special use permits, with forms, fees and submission deadlines available through the city’s development page.⁸ Septic-system regulation stays with Tarrant County Engineering in Southlake, so discuss wastewater approval separately from the city building application.⁴

Does Southlake have zoning, lot-size rules and setbacks?

Southlake adopts and administers its own zoning ordinance inside city limits.² Southlake’s development-related ordinances also include subdivision, landscape, exterior masonry, airport-compatible land use, driveway and lighting ordinances.² Ask Southlake Planning for the parcel’s zoning district and the applicable lot size, dwelling size, setbacks, coverage and height requirements before choosing a house footprint.⁸ We could not confirm those district-specific dimensions or a general agricultural exemption.⁸ For land outside Southlake city limits, consult the Tarrant County guide: the county’s absence of zoning applies to unincorporated land.³

How do septic permits and sewer connections work in Southlake?

Tarrant County Engineering lists Southlake among the cities where the county regulates on-site sewage facilities, or OSSF.⁴ Direct septic permit and system questions to the county OSSF program at 817-212-7082.⁹ Texas generally requires a permit and approved plan to construct, alter, repair, extend or operate an OSSF.¹⁰ For Southlake property developed after July 5, 1988, a city sewer line within 100 feet of the property line triggers a sewer-connection requirement before a certificate of occupancy is granted.⁶ For septic-to-sewer conversion, Southlake publishes a $100 plumbing permit fee, a $1,000–$1,674.63 wastewater impact fee and a $1,700 sewer tap fee; these are conversion charges, not a general building-permit price.¹¹

Can you live in an RV or tiny home in Southlake?

We could not confirm Southlake’s rules for residential RV occupancy, temporary camping, tiny homes or accessory dwellings; ask Southlake Planning about the proposed use and parcel before buying a unit.⁸ Southlake has municipal zoning, so the county’s unincorporated-land answer does not establish permission inside the city.²³ Southlake prohibits short-term rentals of residences or residential structures for less than 30 days, with the leaseback exception preserved in the definition.⁷ That rental prohibition does not resolve whether a particular tiny home or RV can be occupied; request a separate land-use answer from Planning.⁸

Building a home in Southlake: what are the steps?

1. Ask Southlake Planning to identify the parcel’s zoning and the development applications needed for the proposed home, including any plat or site-plan work.⁸
2. Resolve wastewater early: ask Tarrant County’s OSSF program about septic approval, and check Southlake’s sewer-connection condition before relying on septic.⁹⁶
3. Ask Southlake Building Inspections which building application and plans the project requires; design against the city’s adopted codes and local amendments.¹⁵
4. Use Southlake’s online permitting system to submit the building application, upload documents, pay fees, review comments and schedule inspections.¹

Before committing to a parcel, ask Planning which office should confirm floodplain, driveway and domestic-well requirements; we could not confirm the complete city requirements for those topics.⁸

Watch-outs

• Southlake’s municipal zoning applies inside city limits; Tarrant County’s lack of zoning applies outside city limits.²³
• A qualifying Southlake development may need city sewer connection before receiving a certificate of occupancy, even if the buyer intended to use septic.⁶
• We could not confirm Southlake’s RV, tiny-home or owner-builder exemptions; ask Planning about occupancy and Building Inspections about construction before committing.⁸¹

Sources

1. Southlake Building Inspections (cityofsouthlake.com)
2. City Charter & Code of Ordinances (Southlake), quoted and re-checked
3. Guidelines for Development in the Unincorporated Areas of Tarrant County, quoted and re-checked
4. Tarrant County Engineering — Southlake OSSF Service Area (tarrantcountytx.gov)
5. Building Codes (Southlake), quoted and re-checked
6. Sec. 19-86. Required connection to city sewer system (Southlake), quoted and re-checked
7. Sec. 11-94. Short term rentals prohibited (Southlake), quoted and re-checked
8. Southlake Planning & Development Services (cityofsouthlake.com)
9. Tarrant County OSSF Program (Engineering Services) (tarrantcountytx.gov)
10. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
11. Moving from Septic to Sewer — Summary of Fees (Southlake), quoted and re-checked

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.