Unincorporated Irion County

No evidence of a countywide general building permit requirement for ordinary construction in unincorporated Irion County was found. The verified county approval programs are subdivision plat approval and MHRC review under the adopted 2025 county regulations. The same regulations also require applicants to address floodplain status and note that the county's active floodplain management regulations remain applicable. For OSSF/septic, the regulations state permits must currently be obtained directly from TCEQ Region 8 because the county is not the permitting agent as of the regulations' effective date.

Note: No public exempt-work list was found for a countywide general building permit program. The public record reviewed does not support a blanket county building permit for all construction in unincorporated Irion County. The adopted regulations discuss statutory platting exceptions and no-local-exceptions treatment in the subdivision context, but that is not the same as a public exempt-work list for ordinary building permits.

Building code

No public countywide building code adoption for ordinary construction was found. The verified adopted county regulations are the 2025 Subdivision and Manufactured Home Rental Community Regulations. For septic/OSSF, the regulations point applicants to TCEQ/state requirements. No county webpage implementing Texas HB 2833 private-inspection procedures was found.

1. 01
   Confirm the parcel is in unincorporated Irion County. If the site is inside Mertzon city limits, city rules may apply instead.
2. 02
   Identify which county approval is actually triggered. The public record does not support a blanket county building permit for all construction. The verified county approvals are subdivision plat review and manufactured home rental community review, plus related floodplain and septic/OSSF compliance.
3. 03
   For a subdivision plat, assemble the plat application and all supporting documents required by the adopted 2025 regulations. The county's application requires owner, engineer, surveyor, utility, floodplain, tax, and other supporting documentation, and asks whether the project is in a municipality or ETJ, whether other permits are required, and whether the land is in a floodplain.
4. 04
   Submit the completed application and required fees to the Office of the County Clerk at P.O. Box 270, Mertzon, TX 76941, or at the Irion County Courthouse, 209 N Park View St, Mertzon, TX 76941.
5. 05
   If the county determines the application is missing required items, the regulations state the county must notify the applicant not later than the 10th business day after receipt.
6. 06
   After a completed application is received, the county reviews it for completeness, sufficiency, and compliance with the regulations and applicable Texas Local Government Code provisions.
7. 07
   The Commissioners Court approves, conditionally approves, or disapproves the plat by recorded vote at a public meeting. No lots may be sold until the final plat is approved and filed with the County Clerk.
8. 08
   For MHRC projects, follow the separate MHRC application path in the same regulations and submit the required infrastructure-development materials and fees through the County Clerk.
9. 09
   For OSSF/septic in unincorporated Irion County, the regulations expressly state the county does not currently serve as TCEQ's permitting agent; permits must be obtained directly from TCEQ Region 8.

Typical processing time: The regulations require missing-item notice not later than the 10th business day after the county receives the application. No separate county-published overall processing estimate for plat or MHRC approval was found.

Source: Irion County Commissioners Court and Irion County Clerk ↗

The regulations require application, filing, and recording fees to be paid by cashier's check or money order payable to Irion County, Texas and delivered to the County Clerk by mail or hand delivery.

Fees change periodically. Confirm at the official fee schedule ↗ (effective 2025) before budgeting.

Typical sequence: Application submission, completeness review, Commissioners Court action for plat or MHRC approval, then county inspection and enforcement activity as needed for compliance with the adopted regulations. No public inspection scheduling page found. The adopted regulations authorize county officers, employees, agents, or consultants to inspect proposed or active development projects in the unincorporated area.