Last updated: 2026-10-10
Seepwise arranges water seepage repair for walls in Singapore homes: damp patches, bubbling or peeling paint, white salt deposits (efflorescence) and musty corners. The first job is deciding whose wall it is, because in HDB blocks the external facade walls are the Town Council's responsibility (HDB).
What happens on the first visit
The specialist reads moisture across the wall to find where it is wettest, then checks what is on the other side: an external facade, a neighbouring bathroom, a planter box, a concealed pipe or a window. Seepage from a wet area next door is treated like a ceiling leak; seepage through an external wall is a facade job; seepage from a pipe is a plumbing job.
Reading the signs
- Bubbling or peeling paint low on a wall next to a bathroom: usually the wet area next door
- White powdery deposits (efflorescence): salts left behind as water evaporates through masonry
- Damp band after heavy rain on an external wall: facade cracks or a failed window seal
- Damp that never dries, with a higher water bill: a concealed pipe (water leak detection)
Who is responsible
In HDB flats, the Town Council looks after common areas and external facade walls, and HDB asks owners to report external wall cracks to the Town Council (HDB). New HDB flats carry a 5-year warranty covering external seepage (HDB).
In condominiums, BCA's guide notes that seepage can originate within a unit or at common property, recommends a joint inspection with the management to find the cause, and points disputes to the Strata Titles Boards (BCA Guide 13). See condo water seepage: who pays.
How seepage is fixed
The repair follows the source: re-waterproofing the wet area or planter behind the wall, injecting and sealing facade cracks, resealing a window frame, or repairing a pipe. Only after the source is dry is the wall itself treated: damaged plaster removed, a breathable finish applied and repainted. Painting a wet wall traps the moisture and the paint fails again within months.
What is included
- Moisture map across the wall
- Other side of the wall identified
- Responsibility under HDB or condo rules stated
- Source fixed before the wall is treated
- Damaged plaster removed and made good
- Breathable finish where needed
- Photos for the Town Council or MCST if it is theirs
- Written finding and scope
Painting over it vs a quick fix vs a proper repair
| DIY | Quick fix | Proper repair | |
|---|---|---|---|
| First step | Anti-mould paint | Repaint | Find the wet side |
| Responsibility checked | No | No | HDB / MCST rules applied |
| Source fixed | No | Rarely | Yes, before the wall |
| Lasts beyond a season | No | Seldom | Yes, once dry |
| Evidence | None | None | Photos and readings |
What it costs
Seepage repairs are priced after the source is identified, because the fix ranges from resealing a window to re-waterproofing a wet area.
Try the cost estimator or read the waterproofing cost guide.
Related guides
- Who Pays for Water Seepage in a Singapore Condo?
- Is My BTO Leak Covered by HDB's Warranty?
- How to Choose a Waterproofing Contractor in Singapore
How it is done
- Map the damp. Moisture readings show where the water is entering.
- Find the other side. Facade, wet area, planter, pipe or window.
- Fix the source. Or route it to the Town Council or MCST if it is theirs.
- Restore the wall. Plaster made good and refinished once dry.