Generally, large renovation projects, especially those involving structural changes, electrical work, plumbing modifications, or changes to the building's footprint, may require permits. Specific types of renovation work may also require additional approvals from relevant authorities.
Housing and Development Board (HDB) flats in Singapore also typically require permits. It has specific guidelines and regulations in place to ensure that renovations are carried out safely and do not compromise the structural integrity of the overall well-being of the building and its residents.