How much does a building permit cost in unincorporated Irion County, TX?

The minimum permit fee is $3,000.00 base fee for subdivision plat applications, plus $300.00 per lot, space, or divided part, plus required filing and recording fees, plus reimbursement of county engineering or technical consultant fees if incurred. Subdivision variance application fee: $250.00.. Fees are calculated as: Flat base fee plus per-lot/space/divided-part fee for subdivision applications; additional filing, recording, consultant, and variance fees as applicable. Plan check fee: Full reimbursement to the county of all engineering and/or technical consultant fees, if any, incurred for plat review.

County Building Permits

Irion County, TX - 2026 Building Permit Guide

How to apply for a building permit in unincorporated Irion County, Texas. Permit authority, application steps, fees, and inspection requirements.

Texas Updated March 2026

Permit Authority

Covers unincorporated Irion County only. No clearly documented countywide general building-permit department for ordinary vertical construction was found. The verified county controls are narrower and project-specific: subdivision plat review, manufactured home rental community review, floodplain-management compliance, and septic/OSSF controls that route directly to TCEQ Region 8.

Department: Irion County Commissioners Court and Irion County Clerk
Address: Irion County Courthouse, 209 N Park View St, Mertzon, TX 76941
Phone: (325) 835-2421
Email: shirley.graham@co.irion.tx.us
Website: https://www.co.irion.tx.us/

Application Process

Confirm the parcel is in unincorporated Irion County. If the site is inside Mertzon city limits, city rules may apply instead.
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.
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.
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.
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.
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.
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.
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.
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

General Requirements

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.

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.

Fees

Minimum permit fee: $3,000.00 base fee for subdivision plat applications, plus $300.00 per lot, space, or divided part, plus required filing and recording fees, plus reimbursement of county engineering or technical consultant fees if incurred. Subdivision variance application fee: $250.00.
Plan check fee: Full reimbursement to the county of all engineering and/or technical consultant fees, if any, incurred for plat review
Permit fee formula: Flat base fee plus per-lot/space/divided-part fee for subdivision applications; additional filing, recording, consultant, and variance fees as applicable
Payment note: 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. Verify current amounts at the official fee schedule (effective 2025).

Work That Does NOT Require a Permit

Contact the Irion County Commissioners Court and Irion County Clerk to confirm whether your project requires a permit before starting work.

Inspections

How to Schedule

Typical inspection 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.

Additional Resources

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.
County Home Page
County Contact Page
County Judge Page
Approved 2025 Subdivision / MHRC Regulations
License lookup guide: Texas Contractor License Requirements
Contract template: Texas Homeowner-Contractor Agreement
Texas hub: Texas Contractor License & Permit Hub

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Irion County Commissioners Court and Irion County Clerk before applying.

Frequently Asked Questions

Irion County Building Permit FAQ

Do I need a building permit in unincorporated Irion County, TX?: 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.
How much does a building permit cost in unincorporated Irion County, TX?: The minimum permit fee is $3,000.00 base fee for subdivision plat applications, plus $300.00 per lot, space, or divided part, plus required filing and recording fees, plus reimbursement of county engineering or technical consultant fees if incurred. Subdivision variance application fee: $250.00.. Fees are calculated as: Flat base fee plus per-lot/space/divided-part fee for subdivision applications; additional filing, recording, consultant, and variance fees as applicable. Plan check fee: Full reimbursement to the county of all engineering and/or technical consultant fees, if any, incurred for plat review.
How do I apply for a building permit in unincorporated Irion County, TX?: 1. Confirm the parcel is in unincorporated Irion County. If the site is inside Mertzon city limits, city rules may apply instead. 2. 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. 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. 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. 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. 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. 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. 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. 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.
How long does it take to get a building permit in unincorporated Irion County, TX?: Typical processing time is 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..

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authority listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.

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