Building permits, zoning and land rules in Polk County, Texas

Yes. Unincorporated Polk County requires a development permit before building any man-made structure or adding to an existing structure, and a residential development permit is also needed to obtain electric service¹. The permit remains valid for two years after purchase¹. A floodplain project requires an Elevation Certificate before permits can be purchased^1,9. New commercial buildings in unincorporated Polk County must be inspected and comply with NFPA 101 (2021 edition) and NFPA 1 Fire Life Safety Codes⁵. The published commercial rule does not establish a general county residential building-inspection requirement, so ask the Permits Department what inspections, if any, apply to a house⁵. Inside Corrigan, Livingston, Onalaska or Goodrich city limits, the applicable city issues the development permit instead of the county¹. City limits do not move septic permits: the county Permits Department still approves OSSF plans, except near Lake Livingston, where the Trinity River Authority issues them^1,4.

The Polk County Permits Department handles county development permits, OSSF permits and floodplain questions from its office at 602 E Church Street, Suite 141, in Livingston¹. Call 936-327-6820 Ext. 1 or email permits@co.polk.tx.us before finalizing plans¹. The county says commercial development requires Fire Marshal plan review before the development-permit application proceeds¹. A residential development permit costs $150, while a new residential septic permit costs $300 and a residential septic repair permit costs $150⁸. The county generally requires development and septic permits to be obtained at the same time¹. Failure to obtain required permits before construction can lead to administrative charges or court fines and fees⁸.

Unincorporated Polk County has no general county zoning rule setting zoning districts, minimum dwelling size, setbacks, lot coverage or building height². That does not erase the county's development-permit, floodplain, septic, subdivision or special-development rules^1,7,9. Dividing land into two or more tracts outside a municipality generally requires an approved and recorded plat unless a state-law or county exemption applies, such as the Commissioners Court Certificate of Exemption for land used primarily for agriculture, ranching, wildlife management or timber production⁷. Covered residential subdivisions have water-dependent lot minimums: two acres with a private well and approved septic system, or one acre with an approved public groundwater supply and septic system⁷. Those acreage minimums apply to specified residential subdivisions, not automatically to every existing parcel⁷. The cities are different: Corrigan has its own municipal zoning chapter and issues its own development permits, and Goodrich's Planning and Zoning page covers zoning amendments, site plans and plats^1,3. We could not confirm whether Livingston or Onalaska zone, so ask each city before relying on the unincorporated-county answer⁷.

Polk County enforces state OSSF standards, and all on-site sewage facility plans must go to the Polk County Permits Department for approval¹. A narrow exception applies to the first home or residential structure on one deeded tract of at least 10 acres: the owner may avoid purchasing an OSSF permit after filing the county's 10 Acre Exemption Form¹. The exemption does not waive septic standards, does not cover another home on the tract and does not apply to a tract under 10 acres¹. It is a septic-permit exception, not a general owner-builder exemption from the development permit¹. Properties within 2,000 feet of Lake Livingston are directed to the Trinity River Authority for the on-site septic permit, and the permitting authority may impose rules stricter than state minimums⁴. Permitted installations must be inspected before the system is covered, and the county requests at least three working days' notice¹⁰. Only 12.5% of county soils lack severe limitations for a conventional drain field, so obtain a site evaluation before choosing a house location or septic design¹¹.

Unincorporated Polk County does not use general zoning to prohibit tiny-home occupancy or temporary camping, but the development, septic and floodplain rules still apply to the site^1,2,9. A privately operated RV park accommodating two or more RVs for dwelling or sleeping requires an approved infrastructure development plan before construction and a Certificate of Compliance before utilities connect⁶. An unincorporated manufactured-home rental community offering two or more rented spaces for manufactured homes or tiny homes has a similar approval process⁶. Polk County caps qualifying RV parks at 10 units per acre⁶. For a single RV or tiny home, describe the proposed utilities, wastewater arrangement and duration of use to the Permits Department before buying, because the park rules do not answer every parcel-specific servicing question^1,6.

1. Confirm that the parcel is outside city limits and ask the Permits Department whether it lies in a floodplain; floodplain construction needs an Elevation Certificate before permits can be purchased¹.

1. Check whether a recent division of the tract required an approved and recorded subdivision plat⁷.

1. Arrange the septic site evaluation and submit the OSSF plan; use the 10-acre form only when the first-home exemption actually applies¹.

1. Apply for the development and septic permits together, and budget $150 for residential development plus $300 for a new residential septic permit unless the septic exemption applies^1,8.

1. If access crosses a county road right-of-way, obtain the precinct commissioner's driveway or culvert authorization before construction⁷.

1. Keep the septic installation uncovered until inspection and keep the development permit within its two-year validity period^1,10.

Check flood status first because floodplain construction requires an Elevation Certificate before county permits can be purchased¹. Verify that the tract was lawfully divided and that recorded access and utility easements match what the seller promises⁷. If the parcel will use a well, every well in the Lower Trinity Groundwater Conservation District must be registered before drilling, even when the well qualifies for a permit exemption¹². Test the proposed septic area early because only 12.5% of Polk County soils lack severe limitations for a conventional drain field¹¹. Polk County is 78.3% wooded and receives about 53.6 inches of precipitation annually, so include clearing, drainage and all-weather access in the site budget¹¹. Finally, ask the Permits Department whether any certificate is required before occupancy, because the county's published materials do not confirm a general certificate-of-occupancy rule^1,5.