Waterproofing · Singapore
HDB Waterproofing & Leak Repair
Leaks between HDB flats cause headaches for both neighbours. We find the source fast and fix it within HDB's rules.
HDB waterproofing fixes bathroom, balcony and ceiling leaks in HDB flats while following HDB's renovation rules. Where possible, we use no-hacking methods such as nano sealant or PU injection, which don't need an HDB renovation permit and are suitable for BTO flats within the 3-year restriction on removing bathroom finishes.
Last updated November 2026
Working within HDB rules
- Hacking floor or wall finishes in an HDB flat needs an HDB renovation permit.
- Newly completed BTO flats have a 3-year restriction on removing bathroom finishes.
- Structural elements such as reinforced concrete walls, columns and beams must never be hacked.
No-hacking methods avoid the first two constraints, so the work can go ahead quickly.
Who is responsible for the leak?
For leaks between two flats, responsibility is usually shared between both owners, unless the upper flat's renovation caused the leak. Top-floor roof leaks are handled by the Town Council. Read our full ceiling leak guide.
Our approach
We confirm where the water is coming from before quoting, so you aren't paying to waterproof the wrong area, and both neighbours can see the evidence.
How we work
- InspectWe find where the water is actually coming from: tiles, grout, floor trap, pipes, walls or roof.
- QuoteYou get a clear written quote with the method and timeline before any work starts.
- RepairWe fix the source with the right system: nano sealant, PU injection, membrane or roof coating.
- TestWhere the method allows, we water-test before handover so you can see it holds.
Frequently asked questions
Who is responsible for a ceiling leak in an HDB flat?
Usually the upper and lower flat owners share responsibility, unless the upper flat's renovation caused the leak. Top-floor roof leaks go to the Town Council.
Do I need an HDB permit for waterproofing?
Only if the work involves hacking floor or wall finishes. No-hacking treatments don't need one.
Can you fix a leak in a new BTO flat?
Yes. Because of the 3-year restriction on removing bathroom finishes, we use no-hacking methods for these.