Leaks and Pipes / Guide section

Leaking and Burst Pipes: Causes, Checks and What to Do

Finding and dealing with leaking and burst pipes, including hidden leaks in walls and floors.

By KL Plumbing Handbook editors Last updated 15 Nov 2026 4 min read

Quick answer

Close the stopcock or your unit valve first, then find out which side of the meter the leak is on. In a landed house, pipes up to the meter are Air Selangor's and pipes after it are yours. In a condo, building management looks after shared tanks and main pipes, and you look after the pipes inside your unit.

Hand reading a water meter dial in a ground level meter box at the gate of a Malaysian landed house — The meter test: if the dial moves with every tap closed, water is escaping on your side of the meter.

What causes pipes to leak?

Most leaks in Kuala Lumpur and Klang Valley homes come from a short list of causes:

Age and corrosion. Older landed houses, especially in mature areas such as parts of Petaling Jaya, may still have galvanised iron pipes that rust from the inside.
Worn joints and fittings. Threaded joints, compression fittings and flexible hoses loosen and perish over the years.
Heat stress on hot water lines. Pipes between the water heater and the shower expand and shrink every day. Standard PVC is not made for hot lines.
Pressure. A strong booster pump or high mains pressure strains weak joints.
Damage. Nails, drilling, tree roots and ground movement can crack pipes.
Poor installation. Joints made without the right fittings may hold for a while and then fail.

A burst pipe is a sudden split or failure, usually at a weak joint or a corroded section. It needs action straight away. Our home plumbing guide for Kuala Lumpur homes lists the first steps for every urgent problem.

What will you notice?

Some leaks are obvious. Many are hidden. Watch for:

A water bill that is suddenly high
The water meter turning with every tap closed
A damp patch on a wall, or a wet floor with no visible source
Tiles lifting or grout darkening
A water stain on the ceiling below a bathroom
The sound of running water when nothing is on

Our guide to hidden leaks in walls and floors lists the signs in detail.

What can you safely check yourself?

Stop the water if it is leaking now. Our guide on how to turn off your main water supply shows where the stopcock and valves usually are.
Run the meter test. Close everything, read the meter, wait a few hours, read it again. Any movement means water is escaping after the meter. The high water bill guide and our Water Meter Leak Test Calculator walk you through it.
Check toilet cisterns and the tank overflow first. They are the most common quiet leaks.
Look along the pipe route from the meter to the house and under sinks.
Photograph and note everything, with dates.

For a short-term stop-gap on an exposed pipe, read temporary fixes for a leaking pipe. Do not try to seal a concealed pipe.

Landed house: the meter is the boundary

Air Selangor is responsible for pipes up to the customer’s meter. Pipes after the meter are the owner’s. If water leaks on the road side of the meter, report it to Air Selangor. If the leak is after the meter, it is yours to repair. Our guide on who to call for a water leak explains the split.

Condo unit: shared pipes and your pipes

In high-rise buildings, building management looks after the shared tanks and main pipes, and you look after the pipes inside your unit. If water comes through your ceiling from above, tell building management in writing. The Condo and Strata Leaks section explains the inspection process.

What does a repair involve?

Exposed pipe: the damaged section or joint is cut out and replaced, then pressure tested.
Concealed pipe: the leak is located, often with a pressure test, thermal imaging or acoustic detection, then the wall or floor is opened, the pipe repaired, tested and closed up. That last part is called making good. Our guide on what a leak inside a wall involves covers it step by step.
Hot water line: the heater is switched off first. The failed joint is replaced with heat-rated pipe such as PPR. See hot water pipe leaks.
Repeat leaks on old pipe: it may be time to compare a repair with repiping. The Pipe Replacement section helps you decide.

The partner’s published prices for leak repairs, with source and date, are listed further down this page.

When should you call a plumber?

Call a plumber when the meter test confirms a leak you cannot find, when the leak is inside a wall, floor or ceiling, when it is on a hot water line, or when you cannot isolate it. Work on pipes and fittings that carry water from the public mains needs a plumber with an IPA Type A permit from SPAN, under the Water Services Industry Act 2006. Ask about the permit, get a written quote, and agree how the leak will be located before any hacking starts.

Partner published prices

KL1 Plumber's published starting prices, read from kl1plumber.com/price on 15 November 2026

Job	KL1 Plumber published price (read 15 Nov 2026)
Repair leaking pipe	RM200 to RM380
Repair hot water pipe leak	RM100 to RM220
Leak inside walls	from RM500
On-site checking fee	RM30, waived if the quotation is accepted

Source: kl1plumber.com/price, read 15 November 2026. These are the partner's own prices, not market averages. Prices can change, so check the source before you rely on them.

Signs of pipe leaks at home

Everyday signs, photographed in Klang Valley homes

Damp patch with flaking paint low on a wall beside a bathroom door in a Kuala Lumpur home — A damp patch low on a wall often means a concealed pipe.

Water stain spreading across a ceiling board below an upstairs bathroom in a terrace house — A stain below a bathroom can be a pipe, a toilet seal or waterproofing.

Wet driveway tiles along the route from the front gate meter to a terrace house on a dry day — Wet ground on a dry day can point to the underground supply pipe.

Drips falling from a corroded joint on an exposed pipe along an outside wall of an older house — Corroded joints on old exposed pipes tend to leak again and again.

Pipe Leaks guides

Every guide in the Pipe Leaks section

Guide Hidden Leak in a Wall or Floor: Signs to Look For Damp patches, wet floors with no source, lifting tiles and mould: how to spot a concealed pipe leak early in a KL home. Read guide Guide High Water Bill? How to Check Your Meter for a Hidden Leak Turn a high Air Selangor bill into a simple meter test that confirms or rules out a hidden leak on your side of the meter. Read guide Guide Hot Water Pipe Leaks: Causes and What Happens Next Why heater supply lines leak, how to isolate the heater safely, and KL1 Plumber's published hot water pipe repair price (Nov 2026). Read guide Guide Temporary Fixes for a Leaking Pipe: What Is Safe to Try Safe stop-gaps for a leaking pipe until it is repaired: isolate the supply, tape and clamp limits, and what not to try. Read guide Decision guide Air Selangor, Building Management or a Plumber: Who to Call Air Selangor, building management or a plumber? Who handles a leak depends on where it is. A plain guide for landed houses and condos. Read guide Decision guide Leak Inside a Wall: What the Repair Involves How concealed leaks are found and fixed: detection methods, hacking and making good, time, and KL1 Plumber's published price. Read guide

Questions people ask

What should I do first when a pipe bursts?

Close the stopcock near the meter in a landed house, or your unit valve in a condo. If you have a roof tank, close its outlet valve too. Then switch off power to any wet area if you can reach the board safely, and switch off the water heater and booster pump.

How long does it take to fix a leaking pipe?

An exposed pipe can often be repaired in one visit. A concealed leak takes longer, because it has to be found, opened up, repaired, tested and closed again. Ask for a timeline in writing.

Will the plumber need to hack my wall or floor?

For a concealed leak, usually some opening is needed. Detection methods can narrow down the spot first, so the opening is smaller. Ask how much may be opened and whether making good is included.

Is a leak before the water meter my problem or Air Selangor's?

In a landed house, pipes up to the customer's meter are Air Selangor's responsibility and pipes after the meter are the owner's. Report a leak on the supply side to Air Selangor; a leak after the meter is yours to repair.

How do I check for a hidden leak with my water meter?

Close every tap and water-using appliance, note the meter reading, and check it again after a period with nothing running. If the meter keeps moving with every tap closed, there is likely a leak on the owner's side. Check toilet cisterns and the tank first, as they are common hidden sources.

About the authors

KL Plumbing Handbook editors

The KL Plumbing Handbook editors write plain-language guides on home plumbing problems, repair costs and hiring a plumber for homes in Kuala Lumpur and the Klang Valley. Each guide covers one problem and states the source and date of every cost figure.

Spotted an error? Send a correction. See our editorial policy.

Related sections

Pipe Replacement When old pipes should be replaced, pipe materials, and what repiping involves. Go Water Pressure Causes of weak pressure in landed houses and high-rise units, and when a booster pump makes sense. Go Roof Leaks and Waterproofing Ceiling stains, roof leaks, bathroom and balcony waterproofing. Go Condo and Strata Leaks Inter-floor leakage, who is responsible, and how the building management process works. Go