Bolthole Index

Williamson County, Texas

Building permits, zoning and septic rules in Round Rock, Texas

Round Rock, Texas requires a City building permit for work on any building or structure inside city limits1. The City sets its own zoning, while Williamson County has no zoning of its own23. Septic is the exception to city control: an alternative to sewer needs approval from the county health department4.

At a glance

Building permit
Required from the City of Round Rock inside city limits1
Zoning
Set by the City; Williamson County has no zoning23
Septic
City requires sewer connection; alternatives need county health department approval54
Owner-builder
Homeowners may act as their own contractor on a primary residence, with normal permits and inspections6
Accessory structures
5-foot side and rear setbacks; 15-foot maximum height78
Property tax (county-level)
Effective rate of 1.7% in Williamson County9

Who to call

Building permits

City of Round Rock Building Inspection Division

Building permits, plan review and inspections inside Round Rock city limits

512-218-5550

301 W Bagdad Ave, Suite 100, Round Rock, TX 78664

Online permits →

Zoning

City of Round Rock Planning and Development Services

Zoning, planned unit developments and subdivision platting inside Round Rock city limits

512-218-5428

301 W. Bagdad Avenue, Suite 210 Round Rock, Texas 78664

Septic permits

Williamson County Engineer's Office - OSSF Program

TCEQ-authorized septic (OSSF) permitting for Williamson County; the first call for any septic question near Round Rock

512-943-3330

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 23, 2026.

Off-grid gear

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

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Do you need a building permit in Round Rock, TX?

Yes. Round Rock requires a building permit for work on any building or structure inside the city limits, and in the Chandler Creek and Vista Oaks Municipal Utility Districts110.

A homeowner may act as the contractor on their own primary residence even if unlicensed, but Round Rock's building codes, fees, permitting and inspection requirements still apply6. Texas's state trade-license exemptions for owners do not replace City permits11.

Williamson County's rule is different, and it applies only outside city limits: the county does not require new residential construction to conform to any building code12. Inside Round Rock that county answer does not apply.

Who issues building permits in Round Rock, and how do you reach them?

The City of Round Rock Building Inspection Division issues building permits and runs inspections; call 512-218-555010. Applications go through the City's online permit portal at permits.roundrocktexas.gov13.

After the City accepts an application, staff calculate the permit fees and notify the applicant through the portal14. Inspections must be requested by 4 p.m. for the next business day, and two inspections of the same type are included in the permit fee; each additional re-inspection after two failed inspections of that type costs $7515.

Driveway work is split: the public side is permitted by the City Transportation Division through its Street Cut and Driveway Approach permit, while private-side maintenance and cosmetic work is unpermitted but must be built to code16.

Does Round Rock have zoning, and what does it mean for RVs, tiny homes and setbacks?

Round Rock zones its own land, and Williamson County does not zone at all23. Zoning here includes site-specific planned unit development (PUD) districts, and a PUD's standards transfer to later owners like any other zoning district17. The Round Rock Development Code covers subdivision platting, zoning, site plans, landscaping and tree protection, signs and technical building codes18.

For accessory structures on residential lots, the City prohibits encroaching into easements or the 5-foot side and rear setbacks7. The maximum height for an accessory structure is 15 feet, measured from existing ground to the highest point of the roof8.

We could not confirm Round Rock's rules on living in an RV, tiny homes, accessory dwellings, minimum lot size or lot coverage. Ask Planning and Development Services at 512-218-5428 which district a parcel is in and what it allows19. The county's no-zoning answer does not fill that gap inside city limits.

How do septic permits work inside Round Rock?

Round Rock requires a connection to a TCEQ-approved sanitary sewer, except where the City decides the connection would cost an unreasonable amount compared with alternate sewage disposal5. Where an alternate system is allowed, the plans must meet City and TCEQ requirements and be approved by the Williamson or Travis County Health Department before the Planning and Zoning Commission approves the final plat4.

Williamson County's Engineer's Office is authorized by TCEQ to run the county's septic (OSSF) program20. We could not confirm how the City handles septic inspections for a lot already inside city limits, so call the OSSF office at 512-943-3330 before planning any septic system21.

USDA rates only about 2.3% of Williamson County's soils as not limited for a conventional drain field, so a site that qualifies for septic will often need an engineered system22.

Building a home in Round Rock: the steps, in order

  1. Confirm the parcel is inside Round Rock. Property in a city or its extraterritorial jurisdiction (ETJ) must be checked with that city, not the county23.
  2. Ask Planning and Development Services for the zoning district and any PUD that applies1719.
  3. Confirm sewer service, or ask whether the City will allow an alternate system with county health department approval5.
  4. Apply for the building permit through the City's permit portal13.
  5. Pay the fees the City calculates after it accepts the application14.
  6. Request each inspection by 4 p.m. for the next business day15.
  7. For a driveway apron on a public street, apply to the City Transportation Division for a Street Cut and Driveway Approach permit16.

What stays with Williamson County, and what to check before you buy near Round Rock

Williamson County runs the septic program and, for land outside any city, the Certificate of Compliance, floodplain and driveway permits2024. Within city corporate boundaries, the city has floodplain jurisdiction24. We could not find a Round Rock floodplain permit rule, so ask the Building Inspection Division about any parcel near a creek10.

For land outside Round Rock, see the Williamson County page for the county's own answers.

Property taxes are a county-level figure: Williamson County's effective property tax rate is 1.7%, and the median property tax bill is $7,079 a year925.

Watch-outs

  • We could not confirm which building code edition Round Rock has adopted, so ask the Building Inspection Division at 512-218-5550 before you design10.
  • Round Rock's rules on private wells, short-term rentals and agricultural uses were not confirmed; ask Planning and Development Services at 512-218-542819.
  • Williamson County's no-zoning and no-building-code answers apply to land outside city limits only; inside Round Rock the City's rules govern122.
  • A county permit does not replace a City permit: a Certificate of Compliance or floodplain permit from the county does not cover work inside city limits24.

Sources

  1. Building Inspection Division (Round Rock), quoted and re-checked
  2. Zoning Application Information (Round Rock), quoted and re-checked
  3. FAQs - Infrastructure - Developers, quoted and re-checked
  4. Utility Criteria Manual — Water Reuse Water and Wastewater (Round Rock), quoted and re-checked
  5. Utility Criteria Manual — Water Reuse Water and Wastewater (Round Rock), quoted and re-checked
  6. Building Inspection Division (Round Rock), quoted and re-checked
  7. roundrocktexas.gov (Round Rock), quoted and re-checked
  8. Building Inspection Division (Round Rock), quoted and re-checked
  9. Effective property tax rate: Bolthole Index county data
  10. City of Round Rock Building Inspection Division (roundrocktexas.gov)
  11. Exemptions to Electrician Licensing (Texas statewide rule), quoted and re-checked
  12. wilcotx.gov, quoted and re-checked
  13. Homeowner Projects (Round Rock), quoted and re-checked
  14. roundrocktexas.gov (Round Rock), quoted and re-checked
  15. roundrocktexas.gov (Round Rock), quoted and re-checked
  16. Transportation Permits (Round Rock), quoted and re-checked
  17. Zoning Application Information (Round Rock), quoted and re-checked
  18. Long-Range Planning (Round Rock), quoted and re-checked
  19. City of Round Rock Planning and Development Services (roundrocktexas.gov)
  20. On-Site Sewage Facilities (OSSF), quoted and re-checked
  21. Williamson County Engineer's Office - OSSF Program (wilcotx.gov)
  22. 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
  23. wilcotx.gov, quoted and re-checked
  24. Williamson County Development Permits: Online Applications, quoted and re-checked
  25. Median property tax bill: Bolthole Index county data

Written October 23, 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 Round Rock

Round Rock’s own rules

  • Building permitRequired

    Accessory structures inside Round Rock city limits.

    • The combined permit must include associated electrical, plumbing, or mechanical work.
    “If you are planning to work on any building or structure within the City of Round Rock or in the Chandler Creek and Vista Oaks Municipal Utility Districts, you will need to obtain a building permit.”
  • Owner-builder exemptionAvailable (with conditions)

    A homeowner performing work on their own primary residence inside Round Rock city limits.

    • Standard building codes, fees, permitting, and inspection requirements apply.
    “Homeowners may serve as contractors and perform work on their own primary residence even if unlicensed. Standard building codes, fees, permitting and inspection requirements apply.”
  • InspectionsRequired

    Work performed under a City of Round Rock permit.

    • Inspections must be requested by 4 p.m. for the next business day; availability is not guaranteed.
    • Two inspections of the same type are included in the permit fee; after two failed inspections of the same type, each additional re-inspection costs $75 and must be paid before scheduling the final inspection.

    re-inspection fee after two failed inspections: 75 USD (Must be paid before scheduling the final inspection.)

    “An inspection is required when pulling a permit with the City of Round Rock.”
  • Certificate of occupancyLimited

    Spaces inside Round Rock city limits that are newly constructed, remodeled, or renovated.

    • A certificate is not issued where a new occupant takes over an existing space with only cosmetic changes.
    “The City of Round Rock Building Inspections Division issues a certificate of occupancy only under specific circumstances. A certificate is provided when a space is newly constructed, remodeled, or renovated. However, if a new occupant simply takes over an existing space without any changes other than cosmetic ones, a certificate of occupancy will not be issued.”
  • Local zoningPresent (with conditions)

    Land inside Round Rock city limits subject to the City's zoning ordinance and district map.

    • PUDs are site-specific zoning districts; their standards transfer to later owners.
    “A Planned Unit Development (PUD) is a site-specific zoning district tailored to a specific location and use(s).”
  • Zoning districtsPublished (with conditions)

    Zoning districts inside Round Rock city limits, including site-specific PUD districts.

    • A PUD can be amended or removed by rezoning to another zoning district or PUD.
    “A list of existing PUDs in Round Rock is posted online. PUD agreements are adopted as amendments to the Zoning Ordinance and transfer to subsequent property owners just like any other zoning district.”
  • SetbacksSpecified

    Accessory structures on residential property inside Round Rock city limits.

    • The requirement concerns side and rear setbacks and does not establish the primary-dwelling setback schedule.

    side and rear setback: >= 5 feet (Accessory structures may not encroach into easements or these setbacks.)

    “Ensure that the separation in feet between the structure and the property line is noted, as encroachment into easements or 5-foot side and rear setbacks is prohibited.”
  • Building heightSpecified

    Accessory structures inside Round Rock city limits.

    • This is the accessory-structure limit and does not establish the primary-dwelling height schedule.

    maximum height: <= 15 feet (Measured from existing ground level to the highest point of the roof.)

    “The maximum permitted height for any accessory structure is 15 feet 0 inches, measured from the existing ground level to the highest point of the roof.”
  • Off-grid sanitationLimited

    Alternative sewage disposal inside Round Rock city limits.

    • Allowed only where the City determines sewer connection would require unreasonable expenditure compared with alternate sewage disposal.
    • Plans must meet City and TCEQ requirements and obtain approval from the applicable county health department before final-plat approval.
    “Connection with a TCEQ approved sanitary sewer system shall be required except where the City determines that such connection would require unreasonable expenditure of funds when compared with alternate methods of sewage disposal.”
  • Mandatory utility hookupSewer (with conditions)

    Development inside Round Rock city limits requiring wastewater disposal.

    • An alternate method is allowed only where the City determines that sewer connection would require unreasonable expenditure compared with alternate sewage disposal.
    • If alternate disposal is permitted, City, TCEQ, and applicable county-health-department requirements apply before final-plat approval.
    “Connection with a TCEQ approved sanitary sewer system shall be required except where the City determines that such connection would require unreasonable expenditure of funds when compared with alternate methods of sewage disposal.”
  • Subdividing landRegulated (with conditions)

    Subdivision platting and land development inside Round Rock city limits.

    • The City Development Code also addresses zoning, site-plan review, landscaping and tree protection, signs, and technical building codes.
    “The Round Rock Development Code (RDC) is a separate section of the Code of Ordinances that addresses all aspect of land development, including subdivision platting, zoning, site plan review, landscaping and tree protection, signs, and technical building codes.”
  • Driveway accessLimited

    Driveway work inside Round Rock city limits.

    • Private-side general maintenance, cosmetic repairs, and modifications are unpermitted but must be built to code.
    • Public-side work is permitted by the City Transportation Division under its Street Cut and Driveway Approach permit process.
    “General maintenance, cosmetic repairs and modifications, remain the property owner’s responsibility on the private side (unpermitted but must be built to code, contact Building Inspections) and on the public side (permitted by our office, see our “Street Cut & Driveway Approach Permits” section).”
  • Permit feesVariable (with conditions)

    City building permits inside Round Rock city limits.

    • After an application is accepted, the City calculates permit fees and notifies the applicant through the permit portal.
    • Building-permit fees are non-refundable and non-transferable.

    additional same-type re-inspection fee after two failed inspections: 75 USD (Due before final-inspection scheduling.)

    “After your application is accepted, we will calculate the permit fees and notify you via the permit portal to pay.”
  • Permit processPublished (with conditions)

    Homeowner project permit applications inside Round Rock city limits.

    • Applicants must create or log into the permit portal.
    • The cited submission instructions are for accessory-structure applications.
    “Please create an account and/or log in to the Permit Portal (online permitting software) at https://permits.roundrocktexas.gov.”

Rules another office applies inside Round Rock

Round Rock does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Who permits septicMixed (with conditions)

    Alternate sewage-disposal systems associated with development inside Round Rock city limits.

    • The alternative system must meet City and TCEQ requirements.
    • The applicable Williamson or Travis County Health Department must approve the plans before Planning and Zoning Commission final-plat approval.
    “Where alternate sewage disposal is permitted, the plans for such system must meet the requirements of the City, the TCEQ, and be approved by the Williamson or Travis County Health Department, whichever is appropriate, prior to approval of the final plat by the Planning and Zoning Commission.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Round Rock or Williamson County directly.

  • Building code adopted — Construction inside Round Rock city limits.
  • Minimum dwelling size — Single-family dwellings inside Round Rock city limits.
  • Minimum lot size — Single-family residential districts inside Round Rock city limits.
  • Lot coverage — Residential lots inside Round Rock city limits.
  • Living in an RV — RV occupancy on private land inside Round Rock city limits.
9 more unanswered
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Building in a floodplain
  • 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 Round Rock publishes no rule on the point, not that none exists. Williamson County’s page lists the county offices to call.

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