Rusty taps, leaking riser ducts and patchy pressure are signs the building's common pipes are failing. Here is how the replacement project should be run.
In an older condo, the water risers — the vertical pipes that carry water from the roof tanks down to every floor — and the common distribution pipes are common property, so replacing them is a JMB or MC project, not something one owner can fix. Rusty water, repeated leaks in the riser ducts and patchy pressure on some floors are the usual signs. The job is planned like any major building project: a condition survey, an engineer's specification, a tender, and phased floor-by-floor works that keep water running. If water is already coming through a ceiling, ClickBina's leak detection visit is RM300 – RM800, charged separately (indicative 2026, Klang Valley).
In a high-rise building, mains pressure cannot lift water to the top floors, so water is pumped up to storage tanks on the roof and then flows down again through vertical pipes called risers. On each floor a branch leaves the riser and runs to the unit meters, and from the meter the pipe belongs to the unit. Most buildings also have common pipes in car parks, podiums and plant rooms: the suction and delivery lines of the pumps, the tank outlets, and pipes feeding the pool, landscape taps and common toilets.
Our condo water pump set guide explains the pumps and tanks at the top of this system and notes that, in high-rise buildings, the JMB or MC is responsible for the internal plumbing, the pumps and the tanks. The risers and common pipes are the part in between, running through every floor.
| Part | Where it runs | Usually belongs to |
|---|---|---|
| Roof and suction tanks, pumps | Roof, plant rooms | Common property (JMB / MC) |
| Risers (vertical supply pipes) | Riser ducts or shafts, often next to lifts or stairs | Common property (JMB / MC) |
| Floor branches up to the meter | Common corridors, ceilings | Common property (JMB / MC) |
| Pipes after the unit meter | Inside the unit | The unit owner |
| Pipes feeding common facilities | Podium, car park, pool, landscape | Common property (JMB / MC) |
Where exactly the boundary sits depends on the building's strata plan and by-laws, so check them before deciding who pays for a particular length of pipe.
ClickBina's re-piping cost guide describes the same pattern inside a house: rusty water points to corroding galvanised iron, and repairing the same stretch repeatedly signals that the system, not one joint, is failing. It puts the lifespan of galvanised iron pipe in Malaysia's humid climate at 20–30 years, which is why the question comes up in many buildings from the 1990s and earlier.
Because the risers are common property, the management body has to maintain and replace them, funded through the maintenance charges and the sinking fund. Large works like a riser replacement are normally paid from the sinking fund, and where the fund is short the committee may have to propose a special levy at a general meeting. Our JMB tender guide explains when a tender is worth running and how sinking-fund spending is approved.
Owners still have a part to play. If the riser runs inside some units, those owners must give access. Pipes after each meter remain each owner's own job, and some buildings take the chance to offer owners the same contractor for in-unit re-piping at their own cost.
Before anyone prices a replacement, find out what is actually there. A good survey maps every riser and common line, records the pipe material and diameter, opens a sample of ducts, lists every leak repair from the maintenance records and notes where valves no longer shut. It should also say whether the whole system needs replacing or only the worst risers, and whether the pumps and tanks should be done at the same time.
| Approach | When it fits | Watch out for |
|---|---|---|
| Spot repairs | Isolated leaks on a system that is otherwise sound | Costs add up if leaks keep moving |
| Replace the worst risers | Survey shows problems concentrated in certain risers or blocks | Old and new sections must be joined properly |
| Full riser and common pipe replacement | Rusty water and leaks across the building | Largest disruption; needs careful phasing |
| Surface-run new risers, abandon old ones | Old ducts are inaccessible or full | Needs space, casing and committee approval for the look |
New pipework is usually a non-corroding material chosen by the engineer for pressure, diameter and fire-stopping requirements where pipes pass through floors. Ask for the material, the pressure class and the jointing method to be written into the specification, not left to the contractor.
The hardest part of a riser project is not the pipe, it is the residents. Work is usually phased riser by riser, with short planned shutdowns. The contractor installs the new riser alongside the old one, then switches floors across one at a time. The pump set guide describes the same principle for pumps: change one while the other keeps the building supplied.
Where risers run through units rather than common ducts, the contractor will need to enter homes, open boxing, and sometimes hack tiles or ceilings. Agree before the tender how access is booked, who removes and replaces cabinets and ceiling boards, and what standard of making good the owners will get. A clear, written access policy prevents most complaints, and a written record of each unit's condition before work begins protects both sides.
A project of this size needs a written specification from a qualified engineer, a tender to comparable contractors and independent supervision. Ask every tenderer to price the same scope: the risers and floors included, materials, valves, fire-stopping, phasing, shutdown limits, access to units, making good and testing. Insist on pressure testing of each new section before it is put into service, and on a final set of as-built drawings for the management office.
A riser project can take a long time to approve. Meanwhile, if water is dripping into your unit, get the source located before anything is hacked. ClickBina's concealed pipe leak detection guide explains how a leak is traced to a marked location. Report leaks from common pipes to management in writing, with dates, so the repair history supports the case for replacement.
Common pipe and riser works are specified and priced per building. WhatsApp us your job details for a quote: the building age, the number of floors and blocks, where the leaks are and whether a survey has been done. ClickBina's leak detection visit is RM300–RM800, charged separately. ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and trade coordination. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.
How we estimated prices: the only RM figures on this page are ClickBina's leak detection and site visit charges. Riser replacement is priced per building from a survey and specification, so no project price is printed here.
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