In many cases, no. Structures up to 20 m² that are open-sided, attached to an existing building, and at ground level are generally exempt from building consent. Larger shelters (up to 30 m²) may also qualify if designed or reviewed by a Licensed Building Practitioner or Engineer.
Because local rules can vary, it’s best to speak with your local Flexiroof Agent or council for advice — we’re always here to help.