HDB Electrical Wiring and Rewiring in Singapore

The most-discussed thread on this search opens with a homeowner citing an article stating that HDB wiring is typically designed for about 25 years. Two sibling threads ask whether a 32-year-old flat and a 30-year-old three-room need rewiring. That number is the emotional centre of this entire search, and it is used as a sales lever far more often than it is explained.

So: it is a real engineering assumption, and a design life is not an expiry date. Cable insulation sitting in a dry conduit inside a Singapore flat, carrying modest loads, is frequently in good condition well past that mark. Nothing changes on the twenty-fifth anniversary of a block’s completion.

What the figure legitimately does is shift the burden of proof. Below it, an installation is presumed fine unless something says otherwise. Above it, it is worth testing rather than assuming. That is a genuinely different claim from "your flat is 30 years old, you need a rewire", and the difference is a few thousand dollars, more in when HDB wiring needs replacing.

Google asks this on this search and nobody answers it, which is why so many people are surprised on the first day of first fix.

Broadly, no. Published Singapore renovation guidance states that wiring installed in HDB flats must be exposed, and the HDB renovation guidelines electrical works page governs what may be done in a flat. In practice a Singapore rewire looks like surface conduit and trunking, not the buried cable that overseas renovation content trains people to expect.

Two reasons it is not simply bureaucracy. HDB flats contain precast and structural walls that must not be chased, cutting into them is a structural matter, not a finish preference. And exposed wiring stays inspectable and replaceable for the life of the flat, which is precisely why the thirty-year-old installation you are worrying about can be assessed at all.

Where a flush look matters, the route to it is carpentry: trunking runs planned to sit behind or above cabinetry, boxed in as part of the joinery. That has to be designed jointly with the renovation, which is the sequencing point further down this page.

Qanvast’s reporting on Singapore renovation costs contains a finding that no electrical company on this search repeats, presumably because it is not flattering: an electrical package typically represents about 75% of the final cost, with the balance arriving as a variation order.

Read that against the package prices above. A S$2,499 four-room package is, on that evidence, realistically a job somewhere north of S$3,000 by the time it is finished. Not because anyone is behaving badly, because a package is priced on a standard point count, and no actual flat is standard.

The same reporting names the three most expensive late additions, and all three are electrical: data points outside the living room, LED provision for carpentry, and induction hob wiring arriving after the cabinetry was built.

So the defence is simple and it costs nothing. Walk the flat with the furniture plan and count your points before you sign anything. Every point you specify at quotation stage is priced competitively. Every point you specify afterwards is priced by someone who already has the job.

A number without these is not a quote, it is an opening position.

One, the point count: how many 13A power points, light points, data points and dedicated circuits, room by room, and the rate for each additional one. Two, the distribution board: whether it is being replaced, how many ways, and how many spare on completion. Three, testing: insulation resistance, earth continuity and RCCB operation: stated as included, with results provided.

Four, making good: who plasters, who paints, and to what standard. Five, the permit position for your scope, in writing. Six, disposal of the old accessories and cabling. And seven, the name and licence number of the Licensed Electrical Worker responsible for the installation.

That last one you can verify yourself in about a minute, on the ELISE register, step by step.

Google asks who they are. The term merges two separate ideas, which is exactly why the question keeps coming back.

HDB maintains a directory of renovation contractors for renovation work in flats. That is about the renovation relationship, permits, deposits, conduct in the block.

The electrical licence is EMA’s, not HDB’s. The person legally permitted to carry out or supervise electrical installation work is a Licensed Electrical Worker, and the register is ELISE licence register : public, free, about a minute.

So the question worth asking a contractor is not whether they are on a list. It is: which Licensed Electrical Worker is responsible for my installation, and what is their licence number? More on the confusion in whether HDB keeps an approved electrician list.

This is where a rewire is either an asset or an invoice, and the difference is decided in advance by asking.

Test results: insulation resistance, earth continuity and RCCB operation, recorded. The name and licence number of the Licensed Electrical Worker responsible. A labelled board, every way named to a room and a function. A record of what was installed where, which becomes priceless the first time somebody drills a wall. The permit, where one was required.

A rewire that finishes with nothing but a receipt has left you unable to demonstrate that any of it was done: to a buyer, to an insurer, or to the next electrician trying to work out why one circuit behaves oddly.

This page does not publish a package price. Every figure on it belongs to somebody else and is named, collected 18 August 2026. Ask for a quote built from a point count and test results: a package priced before anyone has seen the flat is what produces the 75% problem.

Be wary of a full rewire nobody can evidence. Wiring has no fixed expiry age. If the tests say partial, a good electrician will say partial, and if they say nothing needs doing yet, they will say that.

An earlier version of this page carried a per-metre concealed wiring rate that could not be re-verified, which also sat awkwardly against the exposed-wiring norm in HDB flats. It has been withdrawn.