Harris County explains that all development requires a permit to build legally. According to the county engineering department
: “Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation or drilling operations or storage of equipment or materials.”
However, according to the Houston Public Works Department, “Permits shall not be required for… uncovered wood decks, accessory to a one- or two-family dwelling that are not more than 30 inches above grade.”
Ultimately, you will need a permit to build a deck in Houston if your deck will be covered or higher than 30 inches. The Public Works department has a standard drawing available for use while building an elevated residential deck that will be attached to your home.