Castro County, TX — 2026 Building Permit Guide

§ 01

Permit authority

County Judge's Office

Street address

Castro County Courthouse, 100 E Bedford St., Dimmitt, TX 79027

Phone

806-647-4451

Email

cugccj@castrocounty.org

Coverage

Unincorporated Castro County only. Does not apply inside Dimmitt, Hart, or Nazareth city limits.

Website

Department website

Additional resources

§ 02

When a permit is required

Permit triggers and exempt work for Castro County

No general county building-permit program with public documentation was identified. Verified controls are narrower: county floodplain participation under the NFIP and state-law OSSF/septic permitting rules that apply through the local permitting authority or TCEQ. No evidence was found that Castro County has adopted a county residential building code and inspection program under Texas Local Government Code Chapter 233, Subchapter F.

Note: No public exempt-work list was found for unincorporated Castro County.

Required documents

For OSSF projects: TCEQ OSSF permit application and supporting septic-system materials required by the permitting authority
Floodplain submittal requirements should be confirmed with the county

§ 03

Application process

Application → plan check → issuance → inspection → final

01

Confirm the parcel is in unincorporated Castro County rather than inside Dimmitt, Hart, or Nazareth city limits.
02

Contact Castro County directly to determine whether the project triggers any county-administered floodplain review or other county approval.
03

If the project involves an on-site sewage facility or septic system, follow state OSSF permit rules. TCEQ permits are generally required through the local permitting authority or through TCEQ where no local authorized agent handles permitting.
04

If the parcel lies in a regulated floodplain, confirm the county's current floodplain development permit path. Castro County appears in the March 8, 2022 FEMA community contact listing as an NFIP-participating county.
05

Do not start work until the applicable county or state authority confirms whether a permit, septic approval, floodplain review, or inspection is required.

Source: County Judge's Office ↗

§ 04

Frequently asked

Common questions about unincorporated Castro County permits

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

No general county building-permit program with public documentation was identified. Verified controls are narrower: county floodplain participation under the NFIP and state-law OSSF/septic permitting rules that apply through the local permitting authority or TCEQ. No evidence was found that Castro County has adopted a county residential building code and inspection program under Texas Local Government Code Chapter 233, Subchapter F.

02 How do I apply for a building permit in unincorporated Castro County, TX? ▸

To apply for a building permit in unincorporated Castro County, TX, follow these steps: 1. Confirm the parcel is in unincorporated Castro County rather than inside Dimmitt, Hart, or Nazareth city limits. 2. Contact Castro County directly to determine whether the project triggers any county-administered floodplain review or other county approval. 3. If the project involves an on-site sewage facility or septic system, follow state OSSF permit rules. TCEQ permits are generally required through the local permitting authority or through TCEQ where no local authorized agent handles permitting. 4. If the parcel lies in a regulated floodplain, confirm the county's current floodplain development permit path. Castro County appears in the March 8, 2022 FEMA community contact listing as an NFIP-participating county. 5. Do not start work until the applicable county or state authority confirms whether a permit, septic approval, floodplain review, or inspection is required.