Bolthole Index

Williamson County, Texas

Zoning, building permits and septic rules in Cedar Park, Texas

Cedar Park, Texas (Williamson County) zones land inside its city limits under Chapter 11 of its code1. Building permits are required inside the city before work begins2, and the city's building inspector accepts septic tank permit applications3. Williamson County has no county zoning for land outside city limits4.

At a glance

Zoning
Yes, city zoning under Chapter 11 of the code of ordinances1
Building permit
Required inside city limits before work starts; late permits pay a penalty equal to the fee2
Building code
2021 International Residential Code with local amendments5
Septic
City building inspector accepts septic tank permit applications inside the city3
Outside city limits
Williamson County has no county zoning4

Who to call

Building permits

City of Cedar Park Building Permits & Inspections

Building permits and inspections inside Cedar Park city limits.

512-401-5100

450 Cypress Creek Road, Building 1, Cedar Park, TX 78613

Septic permits

Williamson County Engineer's Office - OSSF Program

TCEQ-authorized septic (OSSF) program for Williamson County outside the city; a place to verify who permits a specific lot.

512-943-3330

Online permits →

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

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Does Cedar Park, Texas have zoning?

Yes. Cedar Park's code of ordinances includes a zoning chapter that governs land inside the city limits1, and the code sets out zoning districts and the land uses allowed in each6. Which district a lot sits in decides what you can build on it.

We could not confirm Cedar Park's rules on RV occupancy, tiny homes, accessory dwelling units, minimum lot size or setbacks, because those depend on the district. Ask the city's Planning staff, or read the district tables in Chapter 111, before you buy.

Do you need a building permit in Cedar Park, Texas, and who issues it?

Yes. Anyone who needs a permit under the codes the city has adopted must obtain it before starting work, and starting early adds a penalty equal to the permit fee2. The city has adopted the 2021 International Residential Code with local amendments for buildings inside the city and its extraterritorial jurisdiction5.

The City of Cedar Park Building Permits & Inspections division issues building permits7. Fees follow a published schedule and are non-refundable8. Applications must give enough information for the building official to set the fee9.

How do septic permits work in Cedar Park, Texas?

Inside Cedar Park, the city code directs the building inspector to accept and process septic tank permit applications3. The code also requires a license from the city for each new private sewage facility in the covered area10.

Texas requires a permit to build, install, alter or repair an on-site sewage facility11. Williamson County's Engineer's Office runs the TCEQ-authorized septic program for the county1213. We could not confirm how the city and county divide septic work on a specific lot, so call the county OSSF office to verify before you design a system. Soils matter too: Williamson County rates only a small share of soils as not limited for a conventional drain field, so expect a site evaluation14.

Building a home in Cedar Park: the steps, in order

  1. Confirm the lot's zoning district in Chapter 11 of the city code6.
  2. Ask Building Permits & Inspections which permits your project needs before work starts27.
  3. Build to the adopted 2021 International Residential Code and its local amendments5.
  4. Apply for a septic tank permit through the city's building inspector if the lot is not on a sewer line3.
  5. Obtain a certificate of occupancy before anyone occupies a new building15.

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

Land outside Cedar Park's limits is a different situation. Williamson County has adopted no county zoning for unincorporated land4, and it handles floodplain verification and driveway culverts there16. See the Williamson County page for those rules.

Williamson County's effective property tax rate is 1.7%17. The county is dense, with about 625 people per square mile18, so check city limits and extraterritorial jurisdiction for any address, since the city's building code reaches into its extraterritorial jurisdiction5.

Watch-outs

  • We could not confirm Cedar Park's rules on owner-builders, private wells, floodplain permits or short-term rentals; call Building Permits & Inspections before you rely on any of them7.
  • A Williamson County rule for unincorporated land does not apply inside Cedar Park, and the city's rules do not follow you outside it1.

Sources

  1. City of Cedar Park, TX Code of Ordinances (Cedar Park), quoted and re-checked
  2. Article 3.02 Permits and Fees (Cedar Park), quoted and re-checked
  3. ecode360.com (Cedar Park), quoted and re-checked
  4. Texas law on county zoning and building authority
  5. Article 3.01 Building Code (Cedar Park), quoted and re-checked
  6. Article 11.02 Zoning Districts and Land Uses (Cedar Park), quoted and re-checked
  7. City of Cedar Park Building Permits & Inspections (cedarparktexas.gov)
  8. Article 3.02 Permits and Fees (Cedar Park), quoted and re-checked
  9. Article 3.02 Permits and Fees (Cedar Park), quoted and re-checked
  10. ecode360.com (Cedar Park), quoted and re-checked
  11. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  12. On-Site Sewage Facilities (OSSF) (2026 county census)
  13. Williamson County Engineer's Office - OSSF Program (wilcotx.gov)
  14. 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
  15. Article 3.02 Permits and Fees (Cedar Park), quoted and re-checked
  16. wilcotx.gov, quoted and re-checked
  17. Effective property tax rate: Bolthole Index county data
  18. Population density: 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 Cedar Park

Cedar Park’s own rules

  • Building permitRequired

    Work inside Cedar Park city limits for which a permit is required by an adopted code.

    • Permit must be obtained before work begins.
    • If work begins before issuance, the applicant must pay a penalty equal to the permit fee in addition to the permit fee.
    “Any person who is required to obtain a permit by the codes adopted by reference in this article shall obtain such permit prior to initiating any work. In the event work is initiated prior to issuance of a permit, a penalty equal to the permit fee must be paid in addition to the permit fee before the permit may be issued.”
  • Building code adoptedAdopted (with conditions)

    Buildings and structures within Cedar Park city limits.

    • The adopted residential code may be amended from time to time so long as amendments do not conflict with state or federal laws.

    residential code edition: 2021 International Residential Code (Includes listed appendices and local amendments.)

    “There is hereby adopted the 2021 International Residential Code, including appendices "AA," "AB," "AC," "AE, "AG," "AH," "AJ," "AK," "AN" and "AP" as may be amended from time to time as such amendments are not in conflict with state or federal laws, as the residential code for the City, for the purpose of establishing rules and regulations for the erection, construction, alteration, enlargement, repair, moving, removal, conversion, demolition, occupancy, equipment, use, height, area and maintenance of buildings or structures within the corporate limits of the City, and within its extraterritorial jurisdiction.”
  • Certificate of occupancyLimited

    New buildings and changes in use or occupancy inside Cedar Park city limits; the stated provision excepts single-family dwelling purposes from the existing-building change-of-use clause.

    • No new building may be occupied before a temporary or permanent certificate is issued.
    • Temporary certificates may be issued during completion or partial occupancy for no more than 30 days when accompanied by fiscal surety.

    temporary certificate maximum period: <= 30 days (When accompanied by fiscal surety.)

    “No change in the use or occupancy of any land or any change of use or occupancy in an existing building other than for single-family dwelling purposes, shall be made nor shall any new building be occupied until a temporary or permanent certificate of occupancy has been issued by the Building Official in compliance with the Chapter 3 of this Code.”
  • Local zoningPresent (with conditions)

    Land inside Cedar Park city limits.

    • Chapter 11 contains the City's zoning regulations.
    “Chapter 11 Zoning (§ 11.01.001 – § 11.09.001)”
  • Zoning districtsPublished (with conditions)

    Land inside Cedar Park city limits subject to Chapter 11 zoning.

    • The municipal code publishes Article 11.02 concerning zoning districts and land uses.
    “ARTICLE 11.02 ZONING DISTRICTS AND LAND USES”
  • Who permits septicLocal (with conditions)

    Private sewage facilities inside Cedar Park city limits.

    • The City code contains a dedicated article regulating private sewage facilities.
    “The building inspector of the city or his duly authorized representative is hereby authorized and directed to accept and process all septic tank permit applications within the jurisdiction of the city.”
  • Off-grid sanitationLimited

    Private sewage facilities used for sanitation inside Cedar Park city limits.

    • Private sewage facilities are subject to the City's dedicated regulatory article.
    “After the effective date of this section, a license must be obtained from the city or its licensing authority for each new private sewage facility which is to be constructed and utilized within the area described in section 18.03.002 above.”
  • Permit feesPublished (with conditions)

    Municipal development and building permits inside Cedar Park city limits.

    • Unless otherwise provided in the code, permits and fees are collected under the appendix schedule.
    • All fees in the fee schedule are non-refundable.
    “Unless otherwise provided for in this code of ordinances, permits and fees shall be collected in the amounts provided for in the schedule found in the appendix of this code. Any reference to fees contained in any code adopted by reference in this code or contained in any chapter of this code shall be superseded by the comprehensive permit and fee schedule in the appendix of this code. All fees provided for in the fee schedule shall be non-refundable.”
  • Permit processPublished (with conditions)

    Permit applications under Cedar Park Chapter 3.

    • Applications must contain adequate information for the building official to determine applicable fees.
    • Submitting false or inaccurate application information is a violation.
    “All applications for permits pursuant to this chapter shall contain adequate information to enable the building official to determine the fees applicable thereto, and it shall be deemed a violation of this article for any person to submit an application containing false or inaccurate information.”

Still unanswered

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

  • Owner-builder exemption — Owner-built residences inside Cedar Park city limits.
  • Inspections — Residential construction inside Cedar Park city limits.
  • Minimum dwelling size — Residential zoning districts inside Cedar Park city limits.
  • Minimum lot size — Residential zoning districts inside Cedar Park city limits.
  • Setbacks — Residential zoning districts inside Cedar Park city limits.
15 more unanswered
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic permit
  • Septic inspection
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • 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 Cedar Park 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