Rewiring an Older Flat: When & What It Costs (2026)

Wiring has a working life, and in many resale flats it ran out a while ago. A flat built in the 1980s may still be running on its original cables, an ageing distribution board and sockets designed for a home with one TV and a rice cooker — now asked to power aircon units, an induction hob, a dryer and a dozen chargers. Most of the time it copes. The signs that it’s struggling are worth taking seriously, because the failure modes for old wiring are electric shock and fire.

Here’s how to tell whether an older flat needs rewiring, what the law requires, what a rewiring job actually involves, and what it’s likely to cost in 2026.

Signs an older flat needs rewiring

You don’t need to be an electrician to spot the red flags:

• Frequent tripping. A breaker that trips regularly under normal use — or worse, fuses that blow — points to overloaded or deteriorating circuits.
• Two-pin sockets. Unearthed round two-pin outlets are a hallmark of old installations with no earth wire on those circuits. Adapters don’t fix the missing earth.
• No RCCB or ELCB. Open your distribution board. If there’s no residual current device — the breaker with a “test” button — the installation predates modern shock protection and should be upgraded as a priority.
• Heat and discolouration. Socket faceplates that are warm, browned or crackle when you plug in are showing you loose or degraded connections.
• Flickering lights and undersized boards. Lights that dim when the aircon starts, or a small DB with only a handful of circuits feeding the whole flat, suggest the installation is running near its limits.

Any one of these justifies getting the installation inspected. Several together usually mean rewiring is a question of when, not if.

The legal bit: it must be an LEW

In Singapore, electrical work isn’t a DIY or handyman job. Electrical works must be carried out by, or under the supervision of, a Licensed Electrical Worker (LEW) licensed by the Energy Market Authority (EMA). That covers rewiring, adding circuits, replacing a distribution board and installing new power points — not just major installations.

On top of that, HDB requires a permit for electrical works in flats, which your LEW or renovation contractor arranges as part of the works. If you’re rewiring during a renovation, this folds into the same approval process as your other works — our HDB renovation permit guide covers what needs a permit and who applies. The practical takeaway: when you collect quotes, ask directly who the LEW on the job is. A contractor who can’t answer that isn’t one to hire for wiring.

What a full rewiring job involves

Rewiring is more than pulling new cables. A typical full job covers:

• A new distribution board with modern circuit breakers and RCCB protection, sized with enough ways for today’s loads plus spare capacity.
• New circuits — separating high-draw appliances like aircon, water heaters and the hob onto dedicated circuits instead of daisy-chaining everything.
• New wiring runs from the DB to every lighting and power point, replacing the old cables entirely.
• New points and faceplates — earthed three-pin sockets where the two-pin ones were, plus any additional points you add.
• Testing and turn-on by the LEW before the installation goes live.

The big layout decision is concealed conduits versus surface trunking. Concealed wiring runs inside the walls and ceiling in embedded conduits — the clean result everyone wants, but it requires hacking and making good, which is why it’s dramatically cheaper to do during a renovation than as a standalone job. Surface trunking runs cables in plastic casing along walls and skirtings — visibly less elegant, but faster, cheaper and non-destructive, which makes it the pragmatic choice for occupied flats and rental units.

Partial versus full rewiring

Not every older flat needs the full treatment. Partial works make sense when the core installation is sound but specific areas fall short: upgrading the DB and adding RCCB protection while keeping healthy wiring, adding dedicated circuits for a new aircon system or induction hob, or converting a cluster of two-pin sockets in one room. An LEW can test insulation resistance and earthing to tell you which circuits are actually degraded rather than guessing.

Full rewiring becomes the sensible call when the flat still has original wiring from several decades ago, when multiple warning signs show up across different rooms, or when you’re renovating anyway and the walls are already open. Half-measures on genuinely old wiring often end up costing more across a few years of piecemeal fixes than one proper job.

What rewiring costs in 2026

Pricing is driven by flat size, the number of lighting and power points, concealed versus trunked runs, and how much making-good is needed. As a rough guide only — get two or three itemised quotes and verify current rates:

• Full rewiring of a smaller HDB flat often starts in the low thousands of dollars, with larger flats and higher point counts pushing well beyond that — concealed wiring with hacking and plastering at the top of the range.
• DB replacement alone is commonly a few hundred dollars, and is one of the highest-value safety upgrades per dollar you can make.
• Individual new points are typically priced per point, with concealed points costing more than trunked ones.

Quotes should itemise the DB, the per-point count and rates, trunking or hacking, and making good. For a sense of how electricians price smaller jobs, see our guide to electrician, plumber and handyman costs.

Time it with your renovation

If a renovation is on the horizon, rewiring belongs in it — not after it. Wiring happens early in the reno sequence, after hacking and before plastering, painting and carpentry, so the walls are opened once and closed once. Retrofitting concealed wiring into a freshly renovated flat means damaging finishes you just paid for.

It’s also the moment to plan points properly: sockets where the TV console and bedside tables will actually be, dedicated circuits for aircon and kitchen appliances, and a few spares where you might want them later — worth thinking through if you’re eyeing smart plugs and home automation down the line. Adding points during rewiring costs a fraction of adding them afterwards.

Buying an older resale? Budget for it upfront

If you’re viewing resale flats from the 1970s–1990s, look at the DB and the sockets during viewings. Original wiring isn’t a reason to walk away — but it is a line item to add to your renovation budget and your negotiation, not a surprise to discover after keys. Factor it alongside the usual works in our breakdown of renovation costs by flat type, and have an LEW assess the installation early so the scope is clear before you sign a reno contract.

The bottom line

Old wiring fails quietly until it doesn’t. If your flat has two-pin sockets, no RCCB, a tired DB or breakers that trip weekly, get an LEW to inspect it and price the fix — sometimes that’s a targeted upgrade, sometimes it’s full rewiring. Insist on a licensed LEW and the proper HDB permit, choose concealed or trunked runs with open eyes, and if a renovation is coming, do the wiring inside it rather than around it. Safe, modern electrics are the least visible upgrade in your home and among the most important. More planning guides live in our renovation and services hub.

Ready to sort out old wiring properly? Drop your details below and we’ll match you with renovation contractors who work with licensed LEWs.