Water Seepage in a New Bangalore Flat: Where It Comes From and Who Has to Fix It
Why brand-new Bangalore apartments leak, how to tell which of the six common causes you have, what the builder is obliged to fix under RERA, and what to document before you complain.
Updated · 7 min read · by HomeGyan certified engineers
The short answer
- Seepage in a new flat is almost always a workmanship defect, not wear and tear — which places it squarely inside the builder's liability.
- Under RERA Section 14(3), a builder must rectify workmanship defects reported within five years of possession, at no cost, within 30 days.
- The six common sources behave differently: knowing which one you have determines who fixes it and how.
- Bangalore seepage is seasonal. A flat handed over in February can look perfect and leak in June, which is why the five-year window matters more than the handover date.
- Photographs with dates, a moisture-meter or thermal record, and a written complaint are what make a claim enforceable. Verbal complaints to a site engineer rarely are.
The six places water actually gets in
A stain on a wall tells you where water emerged, not where it entered. Those are often different rooms. Diagnosing the source correctly is the difference between a fix that holds and one that reappears next monsoon.
| Source | Typical sign | Usually whose responsibility |
|---|---|---|
| Bathroom waterproofing failure | Damp patch on the far side of a bathroom wall, or on the ceiling below | Builder — workmanship |
| External wall penetration | Damp on the weather-facing wall, worse after wind-driven rain | Builder — workmanship |
| Terrace or roof waterproofing | Top-floor ceiling staining, spreading from a corner | Builder, or association if post-liability |
| Plumbing joint leak | Localised, persistent damp that does not vary with rain | Builder — workmanship |
| Window and balcony door seals | Damp below the sill, appears only during rain | Builder — workmanship |
| Expansion joints in high-rise façades | Damp on upper floors, often several units in a vertical line | Builder — workmanship |
Why new flats leak at all
- Waterproofing membranes are applied early and then worked over by other trades. A membrane punctured during tiling fails invisibly until the first heavy rain.
- Curing gets compressed when handover dates slip. Concrete cured for too short a period is more permeable.
- Bangalore's rain arrives sideways. Wind-driven rain on a tall façade finds joints that vertical rain never tests, which is why upper floors leak more.
- Sanitary and plumbing penetrations through slabs are the single most common failure point, because each one is a deliberate hole through the waterproofing.
- A flat handed over in the dry season has not been tested. Nothing about a February handover proves the building is watertight in June.
What the builder is obliged to do
RERA Section 14(3) covers defects in workmanship, quality or provision of services brought to the promoter's notice within five years of possession. The builder must rectify them at no cost to you, and the Act sets 30 days for doing so.
Seepage arising from failed waterproofing is a workmanship defect. The five years run from the date of possession, not from when the defect appears — so a leak that first shows in the third monsoon is still inside the window.
If the builder does not act within 30 days, the Act provides for compensation, and the complaint route is the state RERA authority.
What to document before you complain
- Dated photographs of the affected surface, wide enough to show which room and wall it is.
- A moisture reading or thermal image, which distinguishes active ingress from an old dried stain. Without instrumentation this is the point most disputes stall on.
- The weather at the time. Damp that appears only after rain points to envelope failure; damp that persists in dry weather points to plumbing.
- A written complaint — email or the builder's ticketing system — so the five-year clock and the 30-day obligation both have a provable start date.
- Any earlier verbal complaints, reconstructed with dates. These are weaker but still worth recording.
If the builder refuses
The most common builder response is that the defect is caused by the occupant — a blocked balcony drain, an aftermarket fitting, or "normal settlement". Some of those are legitimate; most are not, and an independent dated record is what settles the question.
An independent inspection report matters here precisely because it is not yours or theirs. It states what was found, where, and when, with instrumentation behind it.
Frequently asked questions
The builder says seepage is normal in the first monsoon. Is it?
No. Some minor efflorescence on fresh masonry is normal; water entering the flat is not. New construction is expected to be watertight at handover, and seepage points to a workmanship defect rather than a settling-in period.
My defect liability period has expired. Do I have any recourse?
The RERA route closes after five years from possession, but a claim may still exist under the sale agreement or general consumer law depending on its terms. If the defect is in common areas, the owners' association is usually the body that pursues it.
Can seepage be fixed from inside the flat?
Sometimes, but internal treatment of a defect whose source is external is usually cosmetic — the stain is covered and returns. Correct repair addresses the point of entry, which for façade and terrace failures means working from outside.
Does thermal imaging actually find this?
It finds moisture behind finished surfaces that is not yet visible, by detecting the temperature difference wet material creates. That matters because it identifies the extent of an affected area, and often catches ingress before it has stained anything.
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