Water Coming Into the House in Heavy Rain
Find Where It Gets In (2026)

Start with where the water appears

When water is on the floor after a storm, the place it shows up first is the best clue. Water runs downhill and along joints, so the wet patch is often near, but not always exactly at, the entry point.

What to do while it is happening

• Keep away from wet sockets and switch off the circuit at the DB box if water is near power points.
• Move furniture, rugs and electronics off the floor.
• Watch where the water comes from and note the time it starts and the rain at that moment.
• Lift an outside drain cover if it is safe and see whether the drain is overflowing or still flowing.
• After the rain, look for the tide line the water left on walls and doors. It shows the height and the path.

That record is worth more than any guess. A route that only floods in a cloudburst is a capacity problem; one that leaks in every shower is a seal or crack problem.

Under the front or back door

The most common route on landed houses. A porch or back yard that falls towards the house, a missing step at the threshold, or a gap under the door lets surface water run inside. Rain blown against the door adds to it.

• Check the fall: pour water on the porch and see which way it runs.
• A door seal or weatherstrip stops wind-blown spray, but it is not a dam; our door seal guide explains which seal does what.
• Where water reaches the door in every storm, the porch needs a channel drain across it, a better fall, or a raised threshold.
• Where it only happens in a flash flood, a removable barrier is the practical answer; see the flood barrier guide.

Up through floor traps and toilets

If water rises out of a floor trap, shower or toilet only in heavy rain, the drains outside cannot take the flow and it is coming back the way it should leave. Rainwater getting into the sewer, a blocked line or a house that sits low against the public drain are the usual causes. Our sewage backing up guide covers how to tell whether the problem is on your side and what fixes it.

Outside drains that overflow

When the drain round the house is silted, broken or too small, it overflows onto the apron and the water finds the lowest door. Clear it first and watch it in the next storm. If it still overflows when clean, the drain or its outlet is undersized; the perimeter drain guide explains repair, resizing and covers, and the drain cleaning guide explains clearing methods.

Balcony and yard sliding doors

Sliding doors to a balcony, patio or yard leak when the track fills faster than its drainage slots can empty it, when the outside floor falls towards the door, or when the frame was set without a proper step under the track. Water then runs over the track and across the floor. The sliding door track guide walks through the water test and the fixes.

Windows

A window that leaks only in wind-driven rain usually has cracked or debonded sealant round the frame, blocked weep holes, or open corner joints. Water often shows below the window or at one corner of the sill. Our window leak guide covers re-sealing and frame repairs.

Through the walls

Walls that take the full force of the rain, such as a corner lot side wall or an upper floor, can let water through cracks, porous render or a joint between brick and a column. The damp patch grows during storms and dries slowly afterwards. That pattern is different from rising damp, which sits low on the wall all the time, and from condensation, which forms on cold surfaces with no rain at all. The external wall seepage guide covers repair options and, in strata buildings, who pays.

Down from the ceiling

Water from above in heavy rain is often not a roof membrane failure at all: gutters, valleys and downpipes that cannot keep up overflow under the roof edge or down inside a wall. Our heavy-rain roof leak guide explains how to tell an overflow from a real roof leak.

When the house sits lower than the road

Many older terrace houses now sit below the road and the drains in front, because the road has been resurfaced and raised over the years. In heavy rain water flows towards the house rather than away. Small fixes help (a channel drain at the gate, a raised threshold, backflow protection on the drains), and the full answer is raising the floor, covered in our ground floor raising guide.

What the usual fixes cost

These are ClickBina's published figures (indicative 2026, Klang Valley). Work on floors, drains and the house level is priced after the route has been confirmed on site.

If the water route cannot be found from the outside, a leak detection and assessment visit is a separate paid service at RM300 – RM800 per visit on ClickBina's sliding door track guide.

How ClickBina can help

WhatsApp us your job details for a quote: your area, house type, where the water appears and when it happens. ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and coordinates drains, porch falls, thresholds, doors, windows and roof work as one job once the route is known. We reply within the hour, and the price we agree is a flat price with no hidden charges.

Sources & methodology

• ClickBina door seal guide — door perimeter seal price.
• ClickBina window leak guide — weep hole, re-seal and sliding-door track prices.
• ClickBina heavy-rain roof leak guide — gutter and valley clearing price.
• ClickBina sewage backing up guide — drain camera inspection price.
• ClickBina drain cleaning, flood barrier and sliding door track guides — drain clearing, pump and leak assessment prices.

How we estimated prices: every RM figure on this page is quoted unchanged from the ClickBina guides named above; they are indicative Klang Valley ranges for 2026.