Yes, per the State of Texas Comptroller's Office as a company we are required to charge sales tax and have a certificate on file. Verbiage: “A self-employed person, with no employees does not have to collect sales tax for cleaning services at residential properties but must collect sales tax for such services at nonresidential properties. See Rule 3.356(a)(7) concerning real property services and our tax bulletin 94-111 on janitorial services. A self-employed person, who hires employees or independent contractors, must collect tax on all cleaning services at both residential and nonresidential properties.” – Summed up, the rule requires all cleaning companies to charge and remit sales tax to the state with exception of those that live at a residence such as a nanny or maid, or a single self-employed person.
Pressure washing is taxable as the restoration or maintenance of tangible personal property (see Rule 3.292). Pressure washing buildings, sidewalks, and parking lots is taxable as building or grounds cleaning (see Rule 3.356).
For more details:
Maid and Janitorial Companies: https://www.comptroller.texas.gov/taxes/publications/94-111.php
Carpet Cleaning and Related Services: https://www.comptroller.texas.gov/taxes/publications/98-709.php