What to check first
Before booking anyone, note exactly when the leak appears (during rain, hours after rain, or constantly), where the stain is relative to the outer wall, and whether the roof above is common property or your own. Those three answers decide who you call first.
Check the ceiling stain's shape and edge. A stain that grows during rain and stops soon after usually means an active crack; one that stays damp long after the rain stops can mean pooling water rather than a fast leak.
The likely causes, in order
The wet season finding an existing crack (most common). Singapore's wet season is the most common trigger for a leak that was already there to show itself. The Meteorological Service Singapore states that higher rainfall occurs from November to January, with December recording 331.9mm and November 252.3mm — the two highest monthly totals in the year. A hairline crack that held through the dry months can start leaking once that rain arrives.
Not knowing whose responsibility it is (second, and worth settling before you spend anything). Whether the leak is your responsibility is the second thing to establish, and it is not automatic. HDB's home care guidance for flat owners states that as a flat owner, you are responsible for the upkeep and maintenance of your flat, but for leaks from common property, contact your Town Council. A top-floor flat's roof is typically common property, not the flat owner's to repair.
A leak that returns after a first fix (third). A leak that returns after a first repair is the third pattern, and it usually means one fix did not address the whole crack. HDB's guidance notes that contractors will recommend a repair method based on the severity of the leak and the flat owners' needs, and that some ceiling leaks may require multiple repair methods. A roof leak is the same: one patch is not always the full fix.
When to call, and who
Report it to your Town Council first if you are in an HDB flat and the roof above is common property — this is the most common situation for a top-floor unit, and the repair cost and arrangement is not yours to carry alone.
Call a roofing contractor directly if the roof is your own, such as a landed property, or if HDB or the Town Council has confirmed the repair is yours to arrange. Larger roof repairs can require a Qualified Person, not just a contractor. HDB's renovation permit guidance states that certain renovations require you to engage a Qualified Person (QP) to certify or supervise the work, which applies to structural roof work in the same way it applies to other major building works.
What it costs
Ask two or three for a written quote instead.
Give each contractor the same description: when the leak appears, where the stain is, how long it has been happening, and whether a first repair has already been tried. A quote for "fix roof leak" with no history given is guessing at the scope.
Ask whether the quote includes tracing the leak to its source before quoting a fix price, and what happens if the first patch does not hold through the next heavy rain.
Who to call, and how to judge them
Roof leak repair is not licensed work in Singapore in the way plumbing is, so there is no public register to check. Judge a roofing contractor on a written scope, a stated call-out fee and a business you can verify instead. An ACRA registration confirms the business exists, nothing more.
Prefer a contractor who asks when the leak happens relative to rain, over one who quotes a fixed price with no questions.
Frequently asked questions
Why does my roof only leak when it rains heavily?
Singapore's wet season is the most common trigger for a leak that was already there to show itself. The Meteorological Service Singapore states that higher rainfall occurs from November to January, with December recording 331.9mm and November 252.3mm — the two highest monthly totals in the year.
Is a roof leak in my HDB flat my responsibility to fix?
Whether the leak is your responsibility is the second thing to establish, and it is not automatic. HDB's home care guidance for flat owners states that as a flat owner, you are responsible for the upkeep and maintenance of your flat, but for leaks from common property, contact your Town Council.
Why did my roof leak come back after it was repaired once?
A leak that returns after a first repair is the third pattern, and it usually means one fix did not address the whole crack. HDB's guidance notes that contractors will recommend a repair method based on the severity of the leak and the flat owners' needs, and that some ceiling leaks may require multiple repair methods.
Sources
- Meteorological Service Singapore, "Climate of Singapore" (fetched 15 Sep 2026)
- HDB, "Ceiling Leaks" home care guide (fetched 15 Sep 2026)
- HDB, "Application for a Renovation Permit" (fetched 15 Sep 2026)
Compare roofing providers and give each the same three answers: when it leaks, where the stain is, and whether the roof is common property.
