Building permits, zoning and land rules in Austin, Texas

At a glance

Building permits

Required for construction and many alterations; specified work exemptions apply¹

Zoning

City base and combining districts govern uses and site development²⁵

Septic authority

Austin Water within the city’s full jurisdiction and designated annexed areas⁴

Owner-builder

Homeowners can register as contractors, with qualification limits and inspection duties⁶

Additional dwelling units

Verify parcel eligibility before applying; address, building permits and inspections required⁷

Occupancy

Residential buildings require a Certificate of Occupancy for their current use⁸

Short-term rentals

Rentals of fewer than 30 consecutive days require an operating license inside city limits⁹

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 Austin, TX?

Austin requires a building permit to construct, enlarge, alter, repair, improve, convert, relocate or demolish a building or structure within the city’s zoning jurisdiction.¹ Specified residential work is exempt, but exempt work must still comply with applicable codes and ordinances.¹ Austin adopts the 2024 International Residential Code with local amendments for residential construction.¹⁰

An Austin homeowner can register as a contractor and take responsibility for activating building permits and scheduling and passing inspections; work exceeding homestead-permit qualifications requires a licensed contractor.⁶ Treat owner-builder eligibility as a way to manage the project, rather than permission to skip the building-permit and inspection steps.⁶

Who handles Austin building permits and residential zoning questions?

Start with Austin Development Services at 512-978-4000 or the Permitting and Development Center at 6310 Wilhelmina Delco Dr. Austin, TX 78752.¹¹ Austin’s Residential Plan Review Division reviews new construction, additions, interior remodeling and demolition for single-family, duplex or two-family homes and additional buildings on a lot.¹²

For an Austin residential parcel, book a Residential Zoning Questions appointment through the Residential Plan Review page to discuss the Land Development Code and additional dwelling units.¹² Submit the appropriate residential building-permit application and supporting documents through the city’s residential application web forms.¹³ Bring the proposed use and building layout to the residential zoning discussion before committing to an ADU application, because Austin requires verification that the property allows an ADU.¹²⁷

Does Austin have zoning, and how do lot size and setbacks work?

Austin has base zoning districts and combining districts that establish allowed uses and site-development regulations.² Austin’s published residential districts include Rural Residence and Family Residence; combining districts may modify or supplement the base district’s rules.⁵ A residential district name therefore belongs at the start of the parcel discussion, alongside any combining district, rather than a single citywide assumption about what can be built.⁵

We could not confirm the numeric lot-size, setback, lot-coverage or height rules for Austin’s Rural Residence district here, or a minimum dwelling size for Rural Residence or Family Residence; ask Residential Plan Review for the standards that apply to the proposed home.¹² For land outside Austin city limits, use the Travis County guide: the county’s unincorporated-area zoning answer differs from Austin’s city zoning.³²

How do septic permits work inside Austin?

Austin Water is the septic authority within Austin’s full jurisdiction and areas annexed for implementing the Health and Safety Code; Lake Austin or tributary frontage falls within city jurisdiction regardless of house or drainfield location.⁴ Call the Austin Water OSSF Program at 512-972-0050 and submit septic applications and inspection requests through Austin Build + Connect.¹⁴ Texas generally requires a septic permit and approved plan to construct, alter, repair, extend or operate an OSSF, subject to exemptions and potentially stricter local requirements.¹⁵

For remodeling an Austin property with an existing septic system, Austin Water approval must come before Austin Development Services issues the building permit.¹⁴ Austin Water also conducts construction inspections during septic installation.¹⁴ Travis County’s soil figures show only 4.2% rated not limited for conventional drain fields; that countywide rating supports getting a site evaluation, not assuming septic is impossible on an Austin lot.¹⁶

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

We could not confirm permission to occupy an RV on a private Austin residential lot while building; ask Austin Development Services about the proposed use before buying land for that plan.¹¹ Austin’s sewer rule for recreational vehicle parks requires connection to city sewer where available, or a compliant private septic system; that park-specific rule does not establish permission to live in an RV on an ordinary residential lot.¹⁷

For a small additional home in Austin, the verified ADU route starts with confirming that the particular property allows an additional dwelling unit, obtaining a unique address or building number, and applying for a building permit.⁷ Austin’s ADU process also requires review and permit fees, permit activation and inspections.⁷ We could not confirm a separate tiny-home occupancy rule or complete manufactured-home occupancy requirements; take the proposed structure and use to Residential Plan Review.¹²

What are the steps to build a home in Austin?

1. Ask Austin Residential Plan Review about residential zoning and the proposed use; for an ADU, verify property eligibility and obtain the required unique address or building number.¹²⁷
2. If the Austin property uses septic, contact Austin Water about septic approval and applications; remodeling with an existing system needs Austin Water approval before the building permit is issued.¹⁴
3. Submit the Austin residential building-permit application and documents, pay plan-review fees and complete review.¹³
4. Pay building-permit fees, activate the approved permits and begin construction.¹³
5. Schedule inspections and secure final approval; Austin provides a new Certificate of Occupancy after a successful final inspection for new construction or significant renovations.¹³⁸

What should you check before buying land in Austin?

Ask Austin’s Floodplain Office to review the property’s floodplain situation: the office maintains floodplain maps and reviews applications to build or remodel in the floodplain.¹⁸ Austin residential review requires floodplain review for property inside the city’s 100-year floodplain or within 100 feet of its boundary.¹²

Austin’s private-property driveway exemption applies to work outside the public right-of-way; a driveway approach in the right-of-way that is installed, relocated, removed or repaired triggers transportation review.¹⁹¹² We could not confirm private-well permit requirements inside Austin; ask Austin Water before relying on a well for the proposed home.¹⁴ If the plan includes renting the Austin residence for fewer than 30 consecutive days, budget for the required short-term-rental operating license.⁹

Watch-outs

• Austin Water approval comes before an Austin building permit when remodeling property with an existing septic system.¹⁴
• Austin’s nitrogen-reduction septic systems require manufacturer-trained and certified maintenance personnel; homeowners may not maintain those systems themselves.¹⁴
• Austin Energy no longer requires the Building Service Planning Application when submitting residential permit applications, according to the city’s October 2026 process notice.¹²

Sources

1. Homeowner's Permit (Austin), quoted and re-checked
2. Zoning Resources & Site Regulations (Austin), quoted and re-checked
3. traviscountytx.gov, quoted and re-checked
4. On-Site Sewage Facilities (Austin), quoted and re-checked
5. Zoning Resources & Site Regulations (Austin), quoted and re-checked
6. Homeowner's Permit (Austin), quoted and re-checked
7. Additional Dwelling Units (Austin), quoted and re-checked
8. Certificate of Occupancy (Austin), quoted and re-checked
9. Short-Term Rentals (Austin), quoted and re-checked
10. § 25-12-243 - Local Amendments to the International Residential Code (Austin), quoted and re-checked
11. Austin Development Services (austintexas.gov)
12. Austin Development Services — Residential Plan Review (austintexas.gov)
13. austintexas.gov (Austin), quoted and re-checked
14. Austin Water Utility Development Services — OSSF Program (austintexas.gov)
15. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
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. library.municode.com (Austin), quoted and re-checked
18. Austin Watershed Protection — Floodplain Office (austintexas.gov)
19. § 25-12-243 - Local Amendments to the International Residential Code (Austin), 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.