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

The minimum permit fee is $50 for driveway with no culvert required; $325 for OSSF or floodplain permits. Fees are calculated as: Flat fees by permit type. OSSF single-family permit application $325; floodplain single-family determination or permit application $325; driveway no culvert required $50 inspection fee; culvert fees vary by culvert length..

How long does it take to get a building permit in unincorporated Washington County, TX?

Typical processing time is No public county processing-time estimate found..

What work is exempt from building permits in unincorporated Washington County, TX?

The following work is generally exempt: Development or construction outside the floodplain does not require a county floodplain permit; Routine septic maintenance such as tank pumping does not require a septic permit. Note: No comprehensive public exempt-work list for general construction in unincorporated Washington County was found. The record reviewed supports floodplain, OSSF, driveway or culvert, and related development controls, not a blanket county building department exemption schedule.

How do I schedule a building inspection in unincorporated Washington County, TX?

Inspections can be scheduled via: Engineering and Development Services, 979-277-6290. Driveway permit applicants must notify the county when culverts are on site for inspection or installation..

County Building Permits

Washington County, TX - 2026 Building Permit Guide

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

Texas Updated March 2026

Permit Authority

Applies in unincorporated Washington County. Verified county permit controls include floodplain permitting, OSSF or septic permitting, and driveway or culvert permits in county right-of-way. A comprehensive general building permit program for all unincorporated construction was not found in public sources.

Department: Washington County Engineering and Development Services - Environmental Health Division
Address: 3650 Highway 36 North, Brenham, TX 77833
Phone: 979-277-6290
Email: wcrboffice@washingtoncountytx.gov
Website: https://www.co.washington.tx.us/page/washington.environmental

Application Process

Determine which county approval applies: floodplain determination and development permitting, OSSF or septic permitting, or driveway or culvert permits in county right-of-way.
Download the correct county form from the Environmental Health page or driveway permit form.
For floodplain work in unincorporated areas, complete the Floodplain Determination / Development Permit Application. A physical address is required before a permit will be issued.
For septic work, assemble the Septic Permit Packet and checklist items. All new, altered, repaired, or enlarged septic systems require a permit before work begins, regardless of acreage.
For county-road access work, complete the Driveway / Culvert Permit Application and submit to Engineering and Development Services.
Email completed floodplain, septic, or driveway materials to wcrboffice@washingtoncountytx.gov unless the county provides another route.
Pay the applicable fee through Certified Payments online or by phone.
Wait for county review, issuance, and any required field inspections or authorizations before starting covered work.

Typical processing time: No public county processing-time estimate found.

Source: Washington County Engineering and Development Services - Environmental Health Division

General Requirements

Verified county permits are required for floodplain development in unincorporated areas, for all new, altered, repaired, or enlarged septic systems regardless of acreage, and for driveways or culvert work within county right-of-way. A blanket county general building permit requirement for all construction in unincorporated Washington County was not found in public sources.

Required Documents

Floodplain application with deed, map, and other information defining the property and proposed development
Septic checklist items including property information, soil evaluation, site plan, and system-specific materials
Driveway or culvert application materials identifying the property, proposed driveway configuration, and culvert information

Permit validity: The county floodplain application expires one year from the date of application if authorization or exemption has not been issued. No general county expiration rule was identified for septic or driveway approvals.
Building code: No public county ordinance was found that clearly establishes a countywide general building code enforcement program for all unincorporated construction. Verified county controls are floodplain, OSSF, right-of-way, and related development regulation programs.
Owner-builder: No county owner-builder handout was found. Texas-context note: because Washington County does not publish a city-style county building permit and inspection program for all unincorporated residential construction, parcel-specific review can still matter for floodplain, septic, utility, lender, insurer, and private-inspection compliance questions, including possible HB 2833 issues on some residential projects.
Contractor requirements: No countywide general contractor licensing program was identified. OSSF work is governed by county OSSF rules and Texas licensing law where applicable.

Fees

Minimum permit fee: $50 for driveway with no culvert required; $325 for OSSF or floodplain permits
Permit fee formula: Flat fees by permit type. OSSF single-family permit application $325; floodplain single-family determination or permit application $325; driveway no culvert required $50 inspection fee; culvert fees vary by culvert length.
Reinspection fee: $150 for OSSF
Payment note: Fees are non-refundable. The county accepts cash, checks, money orders, and credit or debit cards. Card payments carry a processing fee. Certified Payments Bureau Code 9235584 and Account Number 1 are listed on forms and payment instructions.

Fees change. Verify current amounts at the official fee schedule (effective April 15, 2025).

Work That Does NOT Require a Permit

Contact the Washington County Engineering and Development Services - Environmental Health Division to confirm whether your project requires a permit before starting work.

Inspections

How to Schedule

Engineering and Development Services (email)
979-277-6290 (phone)

Scheduling deadline: Driveway permit applicants must notify the county when culverts are on site for inspection or installation.
Inspection hours: Monday through Friday, 7:00 AM to 4:00 PM (except county holidays)

Typical inspection sequence: Varies by permit type. Floodplain review includes determination and development authorization before work begins. Septic review involves permit application, technical review, and field inspections under the county OSSF program. Driveway permits involve county review of culvert sizing and inspection or installation before approval.

Additional Resources

Building code: No public county ordinance was found that clearly establishes a countywide general building code enforcement program for all unincorporated construction. Verified county controls are floodplain, OSSF, right-of-way, and related development regulation programs.
OSSF Regulations
Floodplain Determination / Development Permit
Septic Permit Checklist
Driveway / Culvert Permit Application
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 Washington County Engineering and Development Services - Environmental Health Division before applying.

Frequently Asked Questions

Washington County Building Permit FAQ

Do I need a building permit in unincorporated Washington County, TX?: Verified county permits are required for floodplain development in unincorporated areas, for all new, altered, repaired, or enlarged septic systems regardless of acreage, and for driveways or culvert work within county right-of-way. A blanket county general building permit requirement for all construction in unincorporated Washington County was not found in public sources.
How much does a building permit cost in unincorporated Washington County, TX?: The minimum permit fee is $50 for driveway with no culvert required; $325 for OSSF or floodplain permits. Fees are calculated as: Flat fees by permit type. OSSF single-family permit application $325; floodplain single-family determination or permit application $325; driveway no culvert required $50 inspection fee; culvert fees vary by culvert length..
How do I apply for a building permit in unincorporated Washington County, TX?: 1. Determine which county approval applies: floodplain determination and development permitting, OSSF or septic permitting, or driveway or culvert permits in county right-of-way. 2. Download the correct county form from the Environmental Health page or driveway permit form. 3. For floodplain work in unincorporated areas, complete the Floodplain Determination / Development Permit Application. A physical address is required before a permit will be issued. 4. For septic work, assemble the Septic Permit Packet and checklist items. All new, altered, repaired, or enlarged septic systems require a permit before work begins, regardless of acreage. 5. For county-road access work, complete the Driveway / Culvert Permit Application and submit to Engineering and Development Services. 6. Email completed floodplain, septic, or driveway materials to wcrboffice@washingtoncountytx.gov unless the county provides another route. 7. Pay the applicable fee through Certified Payments online or by phone. 8. Wait for county review, issuance, and any required field inspections or authorizations before starting covered work.
How long does it take to get a building permit in unincorporated Washington County, TX?: Typical processing time is No public county processing-time estimate found..
What work is exempt from building permits in unincorporated Washington County, TX?: The following work is generally exempt: Development or construction outside the floodplain does not require a county floodplain permit; Routine septic maintenance such as tank pumping does not require a septic permit. Note: No comprehensive public exempt-work list for general construction in unincorporated Washington County was found. The record reviewed supports floodplain, OSSF, driveway or culvert, and related development controls, not a blanket county building department exemption schedule.
How do I schedule a building inspection in unincorporated Washington County, TX?: Inspections can be scheduled via: Engineering and Development Services, 979-277-6290. Driveway permit applicants must notify the county when culverts are on site for inspection or installation..

Need help with your project?

Navigating permits in Unincorporated Washington County can be complicated.

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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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