Leaks and Pipes / Guide section

Replacing Old House Pipes: When, Which Materials and What It Involves

When old pipes should be replaced, pipe materials, and what repiping involves.

By KL Plumbing Handbook editors Last updated 15 Nov 2026 3 min read

Quick answer

Pipes are due for replacement when you see brown or rusty water, weak flow at every tap, and leaks that keep coming back, especially in older landed houses with galvanised iron pipes. Repiping can use exposed routing to cut down on hacking. Work on mains-fed pipes needs a plumber with a SPAN IPA Type A permit.

Cross section of an old galvanised iron water pipe narrowed by rust build up inside — Rust builds up inside old GI pipes and narrows the flow.

When should old pipes be replaced?

There is no fixed age, but these signs together suggest your pipes are near the end of their life:

Brown water that keeps coming back, often worst in the morning
Weak flow at every tap, not just one
Leaks that keep coming back in different places
Rust on exposed pipes and joints
Pipes that are decades old and have never been replaced

Why galvanised iron pipes fail

Many older landed houses in Kuala Lumpur and Selangor, including many in Petaling Jaya, were built with galvanised iron (GI) pipe. GI is steel with a zinc coating. Over the years the coating wears away and the steel rusts from the inside. Rust narrows the pipe, colours the water and eventually eats through the pipe wall. Once a GI system starts leaking in several places, more leaks usually follow. Older housing stock like this is a recurring theme across our home plumbing guide.

Our guide on brown or rusty tap water helps you rule out the supply and your tank first.

Repair or repipe?

One leak on otherwise sound pipe is a repair. Repeated leaks on old pipe are a sign to compare repair with repiping. Our guide on pipe repair or repiping the house walks through the decision.

Which materials replace old pipes?

Most new home pipework uses plastic:

PVC pipe and uPVC pipe for cold supply and drains
PPR pipe for hot and cold lines, joined by heat fusion
Polyethylene (PE) pipe for underground runs from the meter
Copper pipe in some homes, especially for hot water

Our comparison of PVC, PPR and copper pipes explains which suits which job.

What does repiping involve?

A survey of the existing pipes and planned routes
Running new pipes, concealed in walls or along surfaces as exposed piping
Connecting taps, toilets, the heater and the tank
Pressure testing the new system
Capping or removing the old pipes
Making good where walls were opened

Exposed routing reduces hacking and makes later repairs easy. Concealed routing looks neater but needs more opening and re-tiling.

What drives the cost?

House size and the number of bathrooms and taps
Concealed or exposed routing
Pipe material
Hacking, plastering and re-tiling
Access to roof spaces and under floors
Whether valves, the tank connections and the underground supply are included

The partner’s published PVC pipe replacement price, with source and date, is listed further down this page. It is a per-metre figure, so a full repiping quote will be built from many metres plus fittings and making good.

Landed house

All pipes after the meter are yours, including the underground run to the house.

Condo unit

You can usually repipe inside your unit, but not the shared risers. Check house rules on hacking and contractor hours first.

When should you call a plumber?

Call a plumber for an assessment if you have brown water, weak flow and repeat leaks in an older house. Ask for the pipe material and condition to be shown to you, and ask for a quote for both a repair and repiping. Repiping is work on mains-fed pipes and needs an IPA Type A permit holder. Our hiring checklist explains what to ask.

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)
Replace PVC pipe	RM65 to RM250 per metre

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 replacement at home

Everyday signs, photographed in Klang Valley homes

Brown water running from a bathroom tap into a white basin in an older terrace house — Brown water at every tap can point to rusting pipes.

Rust stains around a threaded joint on an exposed galvanised pipe on an outside wall — Rust at exposed joints shows what may be happening inside walls.

New pipes running neatly along a service yard wall in clips after repiping — Exposed routing means less hacking and easier future repairs.

Plumber pressure testing newly installed pipes with a gauge before the walls are closed — New pipes are pressure tested before anything is closed up.

Pipe Replacement guides

Every guide in the Pipe Replacement section

Guide Brown or Rusty Tap Water Is brown water from the supply or your own rusting pipes? After a water cut vs persistent, one tap vs all, GI pipes and tank sediment. Read guide Decision guide Pipe Repair or Repiping the House? When spot repairs make sense and when full repiping is better: repeat leak patterns, pipe age and material, disruption and cost factors. Read guide Decision guide PVC vs PPR vs Copper Pipes Compare uPVC/PVC, PPR, copper and PE pipes for KL homes: hot water suitability, jointing methods and what affects lifespan. Read guide

Questions people ask

How do I know what my pipes are made of?

Look at any exposed pipes, near the meter, under sinks, at the tank or in the roof space. Grey or white plastic is usually PVC or PPR. Grey metal with threaded joints and rust spots is often galvanised iron. A plumber can confirm.

Is brown water always a pipe problem?

No. It can come from the supply after a water cut, or from sediment in your tank. If it lasts, affects every tap and comes with weak flow, old pipes are a likely cause.

Can repiping be done in stages?

Often, yes. Many owners replace the worst sections first, such as the underground supply or the pipes to one bathroom, and plan the rest later.

Is brown tap water safe?

Do not drink it until you know the cause. Brown water after a water cut is often sediment that clears; brown water that persists at every tap can point to rusting galvanised iron pipes, common in older Petaling Jaya houses. Contact Air Selangor if it affects the supply rather than only your house.

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 Leaks Finding and dealing with leaking and burst pipes, including hidden leaks in walls and floors. Go Water Pressure Causes of weak pressure in landed houses and high-rise units, and when a booster pump makes sense. Go Hiring a Plumber How to check a plumber's permit, what to ask before work starts, and how quotes and warranties work. Go