Not every renovation in an HDB flat needs a permit — but the ones that touch walls, waterproofing or the structure do. Knowing which is which saves time, money and trouble with HDB. Here is how HDB renovation permits work.
General guidance only — HDB requirements change and carry specific conditions. Always confirm with HDB and your registered renovation contractor.
Who applies for the permit
You do not apply directly. In HDB flats you must engage a renovation contractor on HDB’s registered list, and that contractor applies for the necessary permit on your behalf before permit-required work begins. Using a registered contractor is itself a requirement.
Work that typically needs a permit
- Hacking or altering walls (only non-structural walls, where allowed).
- Demolishing or relocating non-structural elements.
- Works affecting waterproofing, such as in bathrooms.
- Changes that affect floor loading or finishes beyond set limits.
- Other works specified by HDB from time to time.
Work that usually doesn’t
Painting, installing built-in furniture, and like-for-like replacement of finishes generally do not need a permit. When in doubt, ask your registered contractor — they will know what triggers a permit.
Renovation hours and your neighbours
HDB also sets when work can happen. General renovation is allowed during set daytime hours on weekdays and Saturdays, while noisy or dusty works such as hacking and drilling are restricted to weekday daytime hours only, are not allowed on Sundays and public holidays, and noisy demolition is limited to a few days early in the project. Confirm the current permitted hours before you schedule work — they are strictly enforced and exist to protect your neighbours.
Why the permit exists
Permits protect the building’s structure and the people in it. Because so many HDB walls are structural, controls on hacking are there to stop unsafe alterations — see can you hack walls in an HDB flat. For non-structural dividers, see partition walls in Singapore.
Frequently asked questions
Do I need a permit to hack a wall in my HDB flat?
If the wall is non-structural and HDB allows it, yes — applied for by your registered contractor. Structural RC walls cannot be hacked at all.
Can I renovate on a Sunday?
Noisy renovation work is not permitted on Sundays and public holidays. Check HDB’s current permitted hours for the details.
How long does approval take?
For most standard works handled by a registered renovation contractor, permits are processed reasonably quickly — but it is not instant, and you should not start permit-required work until approval is in place. Build the lead time into your schedule, and let your contractor manage the application rather than trying to short-cut it.
The cost of skipping the permit
Doing permit-required work without approval — or worse, work that is never allowed, such as hacking a structural wall — can mean being required to reinstate everything at your own cost, on top of the safety risk and possible penalties. The permit system exists to protect the building and your neighbours; treating it as optional is a false economy. When unsure whether a job needs approval, ask your registered contractor before any work starts.
The HDB renovation process, step by step
A typical HDB renovation follows a clear sequence. You appoint a renovation contractor from HDB’s registered list and agree the scope and design. The contractor identifies which works need a permit and submits the application to HDB on your behalf. Once any required permit is approved, work can begin, carried out within the permitted hours and conditions. On completion, the renovation should comply with the approved scope. Treating the permit as a built-in step — not an afterthought once demolition has started — keeps the whole project on the right side of the rules and on schedule.
Choosing a registered renovation contractor
For HDB flats, using a contractor on HDB’s registered list is not optional — and it protects you. Registered contractors know what needs a permit, what is never allowed, and how to work within the rules and hours. Beyond registration, look for relevant experience, clear written quotations, and a willingness to explain what can and cannot be done rather than promising everything. A contractor who tells you a structural wall cannot come down is not being unhelpful; they are keeping you out of trouble.
Deposits, timelines and common rules
HDB renovations come with practical conditions beyond the permit. There are rules on renovation hours, on protecting common areas, and often a renovation deposit arrangement to cover any damage to shared property. Noisy works such as hacking and drilling are restricted to weekday daytime hours and limited to the early part of the project, and are not allowed on Sundays and public holidays. None of this is onerous once you know it — but building it into your plan from the start avoids friction with HDB and with your neighbours.
Permitted hours and your neighbours
HDB sets clear limits on when work can happen, and they are strictly enforced. General renovation is allowed during set daytime hours on weekdays and Saturdays, while noisy or dusty works such as hacking and drilling are confined to weekday daytime hours, are not permitted on Sundays and public holidays, and noisy demolition is usually limited to the first few days of the project. These rules exist to protect the people living around you. Sharing your schedule with immediate neighbours, and keeping noisy work to the allowed windows, prevents most renovation disputes before they start.
BTO or resale: does the process differ?
The core rules are the same, but the starting point differs. A new BTO flat is a blank canvas with no existing renovation to undo, so works tend to be additive and straightforward. A resale flat may carry years of previous alterations, some of which you will want to change or check, and there are specific rules about what can be done and when after you take over. In both cases the same principles apply: registered contractor, permits where required, and respect for the structure and the permitted hours.
Related reading
- HDB Renovation Loans Explained
- The BCA Contractor Registry Explained
- Operable and Movable Walls in Singapore: Flexible Space
- Drywall Partitions in Singapore: Cost, Build and Soundproofing
For private-property structural works that need engineering input, see our structural engineering consultancy. More in Structure.
