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Codes, exemptions & field inspections

Build to the adopted code. Verify every exception.

This guide translates the available agency record into a preconstruction checklist for structural scope, minor work, and inspection release. The adopted code and the issuing official control when a field condition is disputed.

Regulatory framework

The code baseline for Mason County.

Mason County administers a county development/floodplain permit for residential and nonresidential new construction, substantial improvements, houses, mobile homes, commercial work, fill, and alteration of waterways or drainage courses. It enforces its floodplain regulations and NFIP requirements, county subdivision regulations, and an authorized-agent OSSF program under Texas Health and Safety Code Chapter 366 and 30 TAC Chapter 285. The county OSSF rule is stricter than the state acreage exception: every new OSSF must be permitted regardless of tract size. No countywide ICC structural building-code edition or general trade-permit code was found.

Inspection lane

Submit the complete OSSF packet, floor/construction plan, and nonrefundable fee to the county Designated Representative. After plan approval and issuance of Authorization to Construct, call Eli Castillo at 325-347-2477 at least five working days before the system is ready; do not cover it before inspection. The county issues a Notice of Approval after a successful inspection and payment of all fees. For floodplain/development review, file the included development application and provide one copy of plans and specifications for construction in a floodplain; the administrator determines flood-hazard status, other required permits, and approval or rejection.

Minor-work playbook

Understand what may be exempt—and what is not.

Mason County expressly does not recognize an acreage exemption for new OSSF installations: every new system must be permitted regardless of property size. The floodplain administrator may issue an exemption certificate when a proposed development is outside an identified special flood hazard area, but the county warns that this is not a guarantee against flooding and does not waive other county, state, or federal approvals. No cosmetic-building-work exemption list is published.

Field rule

A permit exemption generally addresses one narrow construction trigger. It does not automatically waive zoning, land-use, floodplain, shoreline, fire, energy, electrical, utility, septic, or right-of-way requirements. Obtain written confirmation when the project involves a new structure, structural alteration, change in occupancy, or concealed work.

Inspection pipeline

Keep the work visible at every release point.

  1. 1

    Request with lead time

    Submit the complete OSSF packet, floor/construction plan, and nonrefundable fee to the county Designated Representative. After plan approval and issuance of Authorization to Construct, call Eli Castillo at 325-347-2477 at least five working days before the system is ready; do not cover it before inspection. The county issues a Notice of Approval after a successful inspection and payment of all fees. For floodplain/development review, file the included development application and provide one copy of plans and specifications for construction in a floodplain; the administrator determines flood-hazard status, other required permits, and approval or rejection.

  2. 2

    Preserve access

    Do not cover framing, reinforcement, wiring, piping, damp-proofing, or life-safety work until the required inspection has been completed and documented.

  3. 3

    Close the record

    Retain the approved plans, inspection approvals, correction responses, and final certificate or occupancy release with the property file.

Contractor verification

Verify the builder before the contract is signed.

Use the state licensing system to verify active registration, trade credentials, bond status, and liability coverage where available. Match the legal business name to the proposal and permit application.

Verify contractor ↗

Planning reference

Keep the parcel rules beside the building plans.

A building permit is only one part of statutory compliance. Check the local zoning, ordinance, map, or land-use reference before finalizing setbacks, height, lot coverage, access, drainage, or accessory structure placement.

Open planning reference ↗

Source trail

Official sources for this profile

Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.

Agency websiteOpen official source ↗Application instructionsOpen official source ↗Fee scheduleOpen official source ↗Planning or zoning referenceOpen official source ↗Contractor license lookupOpen official source ↗

Project questions

Frequently asked questions for Mason County

Who handles permitting for this jurisdiction?

Mason County Sanitation and Floodplain Office is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.

How should I begin an application?

No verified online portal was located in the reviewed public materials. Contact Sanitation/Floodplain Officer Eli Castillo: 325-347-2477 and request the current application route before preparing a final submittal.

How long might review take?

The OSSF Authorization to Construct is valid for one year; inspection must be requested at least five working days in advance, and a Notice of Approval is issued approximately five working days after a successful inspection. The county development/floodplain permit is valid one year and must be renewed if work is not completed. No standard initial plan-review duration is published.

How are inspections scheduled?

Submit the complete OSSF packet, floor/construction plan, and nonrefundable fee to the county Designated Representative. After plan approval and issuance of Authorization to Construct, call Eli Castillo at 325-347-2477 at least five working days before the system is ready; do not cover it before inspection. The county issues a Notice of Approval after a successful inspection and payment of all fees. For floodplain/development review, file the included development application and provide one copy of plans and specifications for construction in a floodplain; the administrator determines flood-hazard status, other required permits, and approval or rejection.

Which codes and exemptions should I review?

Mason County administers a county development/floodplain permit for residential and nonresidential new construction, substantial improvements, houses, mobile homes, commercial work, fill, and alteration of waterways or drainage courses. It enforces its floodplain regulations and NFIP requirements, county subdivision regulations, and an authorized-agent OSSF program under Texas Health and Safety Code Chapter 366 and 30 TAC Chapter 285. The county OSSF rule is stricter than the state acreage exception: every new OSSF must be permitted regardless of tract size. No countywide ICC structural building-code edition or general trade-permit code was found. Mason County expressly does not recognize an acreage exemption for new OSSF installations: every new system must be permitted regardless of property size. The floodplain administrator may issue an exemption certificate when a proposed development is outside an identified special flood hazard area, but the county warns that this is not a guarantee against flooding and does not waive other county, state, or federal approvals. No cosmetic-building-work exemption list is published.

Field sequencing matters

The inspector needs to see the work at the right moment.

Code compliance is not only a plan-review exercise. Footings, reinforcement, framing, fireblocking, wiring, piping, insulation, weather protection, and life-safety systems each have points where the work must remain accessible. Build the inspection calendar into the trade schedule instead of treating it as a final administrative step.

When a project qualifies for a narrow minor-work exemption, keep a written explanation of why it qualifies and confirm that related zoning, utility, fire, energy, or environmental rules do not create a separate approval requirement.

Closeout file

Keep the approved plan set, inspection approvals, correction responses, contractor license verification, final certificate, and any occupancy release together. A clean record protects the owner, builder, lender, insurer, and future buyer.