County Building Permits

Mason County, TX - 2026 Building Permit Guide

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

Texas Updated March 2026

Permit Authority

All unincorporated areas of Mason County. County authority over general building permits is not clearly published; verified controls include OSSF permits, floodplain development review, and subdivision/plat regulation.

Department
Mason County Designated Representative and Floodplain Administrator; Mason County Commissioners Court
Address
201 Ft. McKavett Street, Mason, TX 76856
Phone
325-347-5556
Website
https://www.co.mason.tx.us/

Application Process

  1. No countywide general building permit process was found on the official county website. Verified county permit processes include OSSF, floodplain review, and subdivision approvals.
  2. For OSSF permits: Obtain application forms from the Mason County Designated Representative.
  3. Have the appropriate individual (usually the installer) complete all applicable OSSF forms.
  4. Submit completed forms and fee to the Mason County Designated Representative. Plans must show bedrooms, restrooms, square footage, and water-softener information.
  5. County reviews the OSSF application and plans. Upon approval, it issues an Authorization to Construct valid for one year.
  6. Install the system and contact the Mason County Designated Representative at least 5 working days in advance for the required inspection before covering the system.
  7. After successful inspection, the county issues a Notice of Approval within approximately 5 working days.
  8. For floodplain work: Complete the Mason County Development Permit Application with applicant information, property location, proposed construction details, and one copy of plans and specifications if in a floodplain.
  9. The Floodplain Administrator determines whether the property is in a mapped flood hazard area and whether additional permits are required.
  10. For subdivision approvals: Submit applications to Commissioners Court under the county subdivision regulations and Texas Local Government Code deadlines.

Typical processing time: OSSF Notice of Approval issued within approximately 5 working days after successful inspection. Subdivision and floodplain processing times not published.

Source: Mason County Designated Representative and Floodplain Administrator; Mason County Commissioners Court

General Requirements

No public countywide general building permit requirement was found for ordinary building construction in unincorporated Mason County. Verified county permit or approval triggers: all new OSSF installations and major repairs require an OSSF permit; floodplain development in mapped flood hazard areas uses the county development permit application; subdivision and plat activity is regulated by county subdivision regulations.

Required Documents

  • For OSSF: completed forms, permit fee, and floor or construction plans showing bedrooms, restrooms, square footage, and water-softener information
  • For floodplain review: county development permit form with applicant and property information and one copy of plans and specifications if in a floodplain
  • For subdivision review: applicable application and plat materials per county regulations
Permit validity
OSSF Authorization to Construct valid for one year from issue. Floodplain development permit valid for one year from issue and must be renewed if work is not completed.
Building code
No public countywide building code adoption for general construction was found. Verified county regulatory programs are subdivision rules adopted by Mason County Commissioners Court and county-administered OSSF permitting under TCEQ-authorized local administration.
Owner-builder
OSSF packet expressly contemplates homeowner installation; homeowner must pay any reinspection fee if the homeowner installs the OSSF themselves.
Contractor requirements
No public Mason County contractor-license requirement for general building work found. For septic work, state OSSF licensing rules apply through TCEQ rather than a separate county general-contractor licensing program.

Fees

Minimum permit fee
$210 for single-family residential OSSF permit
Permit fee formula
Flat OSSF fees: $210 for single-family residential and $410 for all other system types (commercial and multi-family)
Reinspection fee
One-half of the permit fee each time the system must be reinspected
Payment note
All OSSF fees are non-refundable and must be paid by personal check, cashier's check, or money order. No cash accepted. Floodplain development permit fees amount not published.

Fees change. Verify current amounts at the official fee schedule (effective October 2024).

Work That Does NOT Require a Permit

Contact the Mason County Designated Representative and Floodplain Administrator; Mason County Commissioners Court to confirm whether your project requires a permit before starting work.

Inspections

How to Schedule

  • 325-347-5556 (phone)
Scheduling deadline
For OSSF inspections, contact the Mason County Designated Representative at least 5 working days before the inspection

Typical inspection sequence: OSSF: authorization to construct, installation, inspection before covering the system, then county Notice of Approval after successful inspection. Floodplain: administrative review by the Floodplain Administrator. Subdivision: review through Commissioners Court.

Additional Resources

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Mason County Designated Representative and Floodplain Administrator; Mason County Commissioners Court before applying.

Frequently Asked Questions

Mason County Building Permit FAQ

Do I need a building permit in unincorporated Mason County, TX?
No public countywide general building permit requirement was found for ordinary building construction in unincorporated Mason County. Verified county permit or approval triggers: all new OSSF installations and major repairs require an OSSF permit; floodplain development in mapped flood hazard areas uses the county development permit application; subdivision and plat activity is regulated by county subdivision regulations.
How much does a building permit cost in unincorporated Mason County, TX?
The minimum permit fee is $210 for single-family residential OSSF permit. Fees are calculated as: Flat OSSF fees: $210 for single-family residential and $410 for all other system types (commercial and multi-family).
How do I apply for a building permit in unincorporated Mason County, TX?
1. No countywide general building permit process was found on the official county website. Verified county permit processes include OSSF, floodplain review, and subdivision approvals. 2. For OSSF permits: Obtain application forms from the Mason County Designated Representative. 3. Have the appropriate individual (usually the installer) complete all applicable OSSF forms. 4. Submit completed forms and fee to the Mason County Designated Representative. Plans must show bedrooms, restrooms, square footage, and water-softener information. 5. County reviews the OSSF application and plans. Upon approval, it issues an Authorization to Construct valid for one year. 6. Install the system and contact the Mason County Designated Representative at least 5 working days in advance for the required inspection before covering the system. 7. After successful inspection, the county issues a Notice of Approval within approximately 5 working days. 8. For floodplain work: Complete the Mason County Development Permit Application with applicant information, property location, proposed construction details, and one copy of plans and specifications if in a floodplain. 9. The Floodplain Administrator determines whether the property is in a mapped flood hazard area and whether additional permits are required. 10. For subdivision approvals: Submit applications to Commissioners Court under the county subdivision regulations and Texas Local Government Code deadlines.
How long does it take to get a building permit in unincorporated Mason County, TX?
Typical processing time is OSSF Notice of Approval issued within approximately 5 working days after successful inspection. Subdivision and floodplain processing times not published..
How do I schedule a building inspection in unincorporated Mason County, TX?
Inspections can be scheduled via: 325-347-5556. For OSSF inspections, contact the Mason County Designated Representative at least 5 working days before the inspection.

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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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