HDB renovation: A guide to understanding allowable modifications

Modifications involving structural changes, such as hacking walls, altering door locations, or modifying electrical and plumbing systems, usually need HDBs approval.
Yes, you can change the flooring, but ensure the new flooring doesnt add excessive weight and complies with HDBs regulations on floor loading.
Yes, there are restrictions. You must ensure that the air conditioning unit complies with HDBs guidelines on placement and water discharge to prevent inconvenience to neighbors.
Merging HDB flats is possible but subject to HDBs approval based on specific criteria, including the eligibility of both units and the proposed design.
Common mistakes include neglecting to obtain necessary HDB permits, underestimating renovation costs, and hiring unlicensed contractors.
Seek recommendations from friends or family, check online reviews, verify licenses, and request detailed quotations from multiple contractors before making a decision.