A platted lot in the state of Texas is approved by the county if it is initially approved by the Plan Commission's Executive Secretary and filed for record with the respective county clerk; a copy of a recorded plat can be obtained online or at the county's clerk's office. Plat approval is valid for 18 months. If it is not recorded in that time frame, an extension must be filed and approved by the Planning and Zoning Committee.
Approved lots are recorded at the county clerk's office. If the property is identified by the lot number and subdivision's name, it is most likely an approved lot. If it is identified otherwise, it probably is not. Copies can be obtained online or through the county's recording office.
Plat approval applications are available on the City's Planning and Development website.