Lavaca County, TX — 2026 Building Permit Guide

On this page 6

§ 01

Permit authority

Flood Plain Management Administration; On-Site Sewage Facility Information

Street address

109 N. LaGrange, P.O. Box 243, Hallettsville, TX 77964

Phone

Floodplain Administration: 361-798-2301; OSSF inspector/designated representative: 361-772-4296

nailener@co.lavaca.tx.us

Coverage

Applies only in unincorporated Lavaca County. No verified countywide general building department or city-style general building permit program was found. Verified county permit controls are floodplain/development screening, OSSF permitting, subdivision platting, and selected road, driveway, pipeline, waterline, and oil and gas permits.

Website

Department website

Additional resources

§ 02

When a permit is required

Permit triggers and exempt work for Lavaca County

No verified countywide general building permit requirement was found for unincorporated Lavaca County. Verified county controls are narrower. The county requires floodplain determination/development permit review before construction in unincorporated areas, mandatory floodplain permitting for development in Special Flood Hazard Areas, OSSF permits for installation, replacement, or repair of on-site sewage facilities, subdivision applications and plats for division of land outside municipal limits unless exempted by law or Commissioners Court, and specific road, driveway, pipeline, waterline, and oil and gas permits.

Scope of work

Permit?

If the proposed property is outside a Special Flood Hazard Area, no further floodplain documentation is necessary after applicable fees are received

Exempt

Subdivision exemptions may apply per state law or discretionary exemption; applicants must still submit an application and proposed surveyed plat for county determination

Exempt

Exempt If the proposed property is outside a Special Flood Hazard Area, no further floodplain documentation is necessary after applicable fees are received
Exempt Subdivision exemptions may apply per state law or discretionary exemption; applicants must still submit an application and proposed surveyed plat for county determination

Note: No broad public exempt-work list for unincorporated county construction was found.

Required documents

Floodplain Determination Application with applicant information, legal and physical description, proposed construction description, and aerial map if over 2 acres
OSSF application packet: county OSSF application, soil and site evaluation, floodplain application, and related affidavits
Subdivision review documents: completed application, surveyed plat, and fees

Building code: No countywide building code adoption for unincorporated general construction was verified. Reviewed county materials confirm adoption of a flood damage prevention ordinance and an OSSF regulatory order/program instead.
Permit validity: No public general expiration rule was found for county floodplain or subdivision permits in the reviewed sources.
Owner-builder: The county states no homeowner is allowed to install or maintain an OSSF if the system requires it.
Contractor requirements: All septic permits must be applied for through a TCEQ-licensed professional OSSF installer of the applicant's choice. No countywide general contractor license requirement was found for general building work.

§ 03

Application process

Typical processing: OSSF designated representative will approve or deny an application within 30 days of receiving the application. No public county-wide time estimate was found for floodplain or subdivision review.

01

For proposed construction or development in unincorporated Lavaca County, submit a Floodplain Determination Application with the applicable fee to Flood Plain Management Administration before construction starts. The county states a development permit must be completed and returned before the start of any construction.
02

If the county determines the property is inside a Special Flood Hazard Area, file the required floodplain development permit and any supporting floodplain documentation. If the site is outside the SFHA, the county states no further floodplain documentation is necessary.
03

If the project requires an on-site sewage facility, have a TCEQ-licensed OSSF installer submit the OSSF application packet by appointment to the county's designated representative. The county says an Approval to Construct will be issued by email or fax within 30 days of receiving the application, and no OSSF construction may begin before the ATC is received.
04

If land is being divided outside municipal limits, submit the subdivision application and surveyed plat even if the applicant believes the plat may be exempt. The county states it will determine exemptions and issue any certificate of exemption through Commissioners Court.
05

For road, driveway, pipeline, waterline, and oil and gas activity, submit the specific county permit forms listed on the Permits & Applications page.
06

Schedule OSSF inspections directly with the designated representative.

Typical processing time: OSSF designated representative will approve or deny an application within 30 days of receiving the application. No public county-wide time estimate was found for floodplain or subdivision review.

Source: Flood Plain Management Administration; On-Site Sewage Facility Information ↗

§ 04

Fee schedule

Lavaca County building permit fees

Fee type

Amount

Minimum permit fee

$20 for residential/commercial floodplain development permit; $250 for final plat

Plan check fee

No separate plan-check fee was identified in the reviewed county sources.

Permit fee formula

Floodplain residential/commercial permits are flat-fee; subdivision plats are flat plus per-lot: plat without designated floodplain is $2,000 plus $10 per lot; plat in designated floodplain is $2,500 plus $10 per lot; final plat is $250; pipelines are $20 application fee plus $100 permit fee for each flood zone crossed; well/platform locations are $20 application fee per well or rig

Reinspection fee

No public reinspection fee sheet was identified in the reviewed county sources.

OSSF page states all payments are made out to Lavaca County. Floodplain determination form and permit pages direct submission with appropriate fee to county offices.

Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.

§ 05

Required inspections

Scheduling and sequence

How to schedule

Neiland Dean (OSSF): 361-772-4296 (phone)

Typical sequence: For floodplain matters, county process starts with a determination application, then requires a development permit if the site is in the SFHA. For OSSF work, the county requires a complete application packet, issues Approval to Construct, then the applicant schedules inspections with the designated representative before operation.

Source: Flood Plain Management Administration; On-Site Sewage Facility Information ↗

§ 06

Frequently asked

Common questions about unincorporated Lavaca County permits

01 Do I need a building permit in unincorporated Lavaca County, TX? ▸

02 How much does a building permit cost in unincorporated Lavaca County, TX? ▸

Building permit fees in unincorporated Lavaca County, TX are set by the local building department and vary by project type and valuation. The minimum permit fee is $20 for residential/commercial floodplain development permit; $250 for final plat. Fees are calculated as: Floodplain residential/commercial permits are flat-fee; subdivision plats are flat plus per-lot: plat without designated floodplain is $2,000 plus $10 per lot; plat in designated floodplain is $2,500 plus $10 per lot; final plat is $250; pipelines are $20 application fee plus $100 permit fee for each flood zone crossed; well/platform locations are $20 application fee per well or rig. Plan check fee: No separate plan-check fee was identified in the reviewed county sources..

03 How do I apply for a building permit in unincorporated Lavaca County, TX? ▸

To apply for a building permit in unincorporated Lavaca County, TX, follow these steps: 1. For proposed construction or development in unincorporated Lavaca County, submit a Floodplain Determination Application with the applicable fee to Flood Plain Management Administration before construction starts. The county states a development permit must be completed and returned before the start of any construction. 2. If the county determines the property is inside a Special Flood Hazard Area, file the required floodplain development permit and any supporting floodplain documentation. If the site is outside the SFHA, the county states no further floodplain documentation is necessary. 3. If the project requires an on-site sewage facility, have a TCEQ-licensed OSSF installer submit the OSSF application packet by appointment to the county's designated representative. The county says an Approval to Construct will be issued by email or fax within 30 days of receiving the application, and no OSSF construction may begin before the ATC is received. 4. If land is being divided outside municipal limits, submit the subdivision application and surveyed plat even if the applicant believes the plat may be exempt. The county states it will determine exemptions and issue any certificate of exemption through Commissioners Court. 5. For road, driveway, pipeline, waterline, and oil and gas activity, submit the specific county permit forms listed on the Permits & Applications page. 6. Schedule OSSF inspections directly with the designated representative.

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

Building permit processing times in unincorporated Lavaca County, TX typically run OSSF designated representative will approve or deny an application within 30 days of receiving the application. No public county-wide time estimate was found for floodplain or subdivision review.. Timelines can vary based on project complexity and current department workload.

05 What work is exempt from building permits in unincorporated Lavaca County, TX? ▸

Not all construction work requires a permit in unincorporated Lavaca County, TX. The following work is generally exempt: If the proposed property is outside a Special Flood Hazard Area, no further floodplain documentation is necessary after applicable fees are received; Subdivision exemptions may apply per state law or discretionary exemption; applicants must still submit an application and proposed surveyed plat for county determination. Note: No broad public exempt-work list for unincorporated county construction was found. When in doubt, confirm with the local building department before starting work.

06 How do I schedule a building inspection in unincorporated Lavaca County, TX? ▸

Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Lavaca County, TX via: Neiland Dean (OSSF): 361-772-4296.

last verified April 2026 source Flood Plain Management Administration; On-Site Sewage Facility Information ↗ entry id permits/texas/lavaca/unincorporated

Report a correction

Educational reference. Permit rules and fees change — confirm current requirements directly with Flood Plain Management Administration; On-Site Sewage Facility Information before applying. Jaspector is not legal advice.

Unincorporated Lavaca County