✔️ When You Can Build a Granny Flat Without a Building Consent The granny flat building consent exemption allows you to build a standalone dwelling up to 70m² without applying for a building consent as long as all of the following are true : You must: Use a Licensed Building Practitioner (LBP) to supervise design and construction. (This is non-negotiable; DIY doesn’t qualify.) Meet all Building Code requirements , even without council sign-off. Follow all district plan rul