If you are the homeowner doing work on the property that is your homestead, you do not have to hire a contractor for electrical, mechanical, or plumbing work. However, you are required to get a permit, and the work must be able to pass inspection.
Additional resources
When do I need an engineer?
A variety of project types require the services of an engineer. For example, remodeling a building to remove structural columns or constructing a retaining wall that is four feet taller. This handout from the Texas Board of Professional Engineers is a good starting point to determine whether you need an engineer. You can also call our Permits office at 817-297-2201 ext. 3000.
When do I need an architect?
The Texas Board of Architectural Examiners provides this handout to help you determine if your project requires an architect.