HDB rewiring cost in Singapore: full vs partial

Rewiring is the one electrical job nobody budgets for and everybody discovers late. As an indicative 2026 figure, a full HDB rewire runs about S$2,500–4,000 for a 3-room flat, S$3,500–5,500 for a 4-room and S$4,500–7,000 for a 5-room or executive, distribution board included. A partial rewire, covering only the circuits actually failing, is typically S$1,200–3,000. This guide covers what moves those numbers, how to tell which one your flat needs, and the single decision that determines whether you pay once or twice.

What rewiring actually means

Rewiring is not the same as electrical works generally. Adding sockets, fitting downlights and running a LAN point are additions to a system that works. Rewiring replaces the system itself: the cables running through your walls and ceiling, the circuits they form, and usually the distribution board they all terminate in.

A full rewire in an HDB flat typically covers:

• New cabling throughout. Lighting circuits, socket circuits and dedicated runs, pulled through existing conduit or newly chased.
• A new distribution board (DB). Modern miniature circuit breakers plus residual current protection, replacing old rewireable fuses.
• Recircuiting. Splitting the flat sensibly so a tripped kitchen doesn't take the bedrooms with it.
• Dedicated circuits for heavy loads: water heater, oven, induction hob, aircon.
• New accessories. Sockets, switch plates and faceplates, since the old ones rarely survive the change.
• Testing and certification by the Licensed Electrical Worker who signs the installation off.

If what you actually want is a few more power points or a set of downlights, you want our HDB electrical works cost guide instead. That page covers per-point pricing. This one is for owners facing the bigger question.

HDB rewiring cost by flat type (2026)

Rewiring is priced by circuit count and access, and both scale with flat size. Indicative Singapore ranges:

Scope	Indicative cost (SGD)	What it covers
Partial rewire	$1,200 – $3,000	Selected failing circuits only; DB may be retained
Full rewire, 3-room	$2,500 – $4,000	All circuits plus new DB
Full rewire, 4-room	$3,500 – $5,500	All circuits plus new DB
Full rewire, 5-room / executive	$4,500 – $7,000	All circuits plus new DB
Distribution board replacement only	$550 – $1,200	New DB, breakers and RCCB on sound existing wiring
Single dedicated circuit	$250 – $500	One new run from DB, e.g. for a water heater or oven
Making good after concealed work	$400 – $1,200	Chasing repair, plastering and repainting affected walls

Read that last row carefully, because it is the one most quotes leave out. Rewiring quotes often price the electrical work and stop there, leaving you with sound wiring inside scarred walls. Ask explicitly whether making good is included, and if it isn't, price it now rather than discovering it later. Our guides to wall plastering and skim coating and HDB painting costs cover what that stage runs.

Seven signs your flat needs rewiring

Age alone doesn't decide it. Behaviour does. Any two of these together and it is worth an inspection:

1. Breakers trip when appliances combine. Kettle, aircon and washing machine together, reliably, in the same pattern.
2. Warm or discoloured faceplates. A socket that is warm to the touch with nothing plugged in is not normal.
3. Rewireable fuses in the DB rather than modern breakers, and no residual current protection.
4. Two-pin sockets still in service. A reliable marker of original 1980s-or-earlier wiring.
5. Lights dim noticeably when the aircon compressor or a pump kicks in.
6. Extension cords everywhere, permanently, because there are not enough points. That is a symptom, not a solution.
7. Any burning smell near a point or the DB. Stop using that circuit and get it inspected the same week.

The seventh is not a budgeting item. Treat it as urgent.

Partial or full? The decision that sets the price

Most owners assume it is all or nothing. It isn't, and the choice is worth real money.

	Partial rewire	Full rewire
Scope	The circuits that are failing	Every circuit, plus DB
Typical spend	$1,200 – $3,000	$2,500 – $7,000
Duration	1 – 2 days	3 – 5 working days
Disruption	Contained to affected rooms	Whole flat, power off in stages
Best when	Wiring is broadly sound; one or two circuits are overloaded or damaged	Flat is 1980s-or-earlier and untouched, or you are renovating anyway
Risk	You may be back in two years for the rest	Higher upfront cost, nothing left behind

The honest rule of thumb: if you are already renovating, rewire fully. If you are not, and only the kitchen circuit is misbehaving, a partial rewire plus a DB upgrade often buys another decade for a third of the price. What you should not do is patch the same flat three times in five years. By the third visit you will have paid for a full rewire and still have old cable in half the walls.

What moves the number

Two flats of the same type can quote a thousand dollars apart. The reasons are usually these:

• Concealed vs surface. Pulling new cable through sound existing conduit is the cheap path. Chasing fresh channels into walls adds labour, plaster and paint. Surface trunking is cheapest of all but visibly runs along your walls forever.
• Conduit condition. If the original conduits are crushed, blocked or were never continuous, the cheap path disappears, and nobody can tell you this reliably before a site visit.
• Circuit count. More points and more dedicated runs means more cable, more breakers and a bigger DB.
• Occupied or empty. Working around furniture and a family living there is slower than an empty flat, and it usually means staged power shutdowns.
• Making good. As above: chasing repair, plastering and repainting is a real cost, not an afterthought.
• Ceiling access. A false ceiling that has to come down and go back up adds to both ends of the job. Where a new false ceiling is planned anyway, that cost largely vanishes.

The LEW rule you cannot skip

In Singapore, electrical installation work (new wiring, new circuits, any alteration at the consumer unit) must be carried out or supervised by a Licensed Electrical Worker (LEW) under the Energy Market Authority licensing framework. Rewiring sits squarely inside that definition. There is no interpretation under which a full rewire is handyman work.

What that means practically:

• A proper contractor prices the LEW into the quote as standard and can name them.
• The LEW is professionally accountable for the installation being safe and to code, and that accountability is what you are buying.
• A quote that is dramatically cheaper than the rest and vague about licensing is usually cheaper for exactly that reason.
• Unlicensed wiring is a fire and shock risk sealed inside your walls, and it can complicate an insurance claim after the fact.

Ask for the LEW's licence number before work starts, not after. It takes one message and it is the single highest-value question on this page.

When to rewire during a renovation

Electrical is a first-in, last-out trade. On a whole-flat renovation the order runs:

1. Hacking and masonry. Walls and floors opened. See our guide to HDB hacking and demolition rules.
2. First-fix electrical. Old cable stripped out, new cable and conduit run, point positions fixed. This is the rewire. It must be finished before plastering and before any ceiling closes up.
3. Plastering, ceilings, tiling, carpentry, painting.
4. Second-fix electrical. DB, breakers, sockets, switches, downlights installed and the whole installation tested and certified.

Rewiring at step 2 costs a fraction of rewiring afterwards, because the walls are already open and the making-good is already in the programme. Rewiring a finished flat means chasing, patching and repainting rooms that were fine the week before. If a full renovation is on the table, our itemised whole-flat cost breakdown shows where electrical sits against the other trades.

Living in the flat while it happens

Most owners can, with planning. What to expect:

• Power off in stages, circuit by circuit, for parts of each working day rather than the whole job.
• Fridge and router should be identified on day one and kept on a circuit that stays live, or run from a temporary supply.
• Dust wherever walls are chased, so expect furniture sheeted and a final clean at the end. Our move-in cleaning guide covers what a proper post-works clean involves.
• Bedrooms last, if you ask for it, so there is always somewhere with power to retreat to.

Getting a rewiring quote you can compare

Rewiring quotes are unusually hard to compare because scope varies so much. Insist on four things:

• An on-site inspection before any number. Conduit condition decides the price and cannot be assessed over WhatsApp.
• The circuit schedule. How many circuits, which rooms, which dedicated runs. This is what actually differs between two quotes.
• Concealed or surface, stated in writing, room by room if it varies.
• Making good, in or out. If out, get it priced separately now.

Then check the contractor, not just the price. Our guide to choosing a renovation contractor in Singapore covers what to verify. For rewiring specifically, add the LEW licence number to that list.

Frequently asked questions

How much does it cost to rewire an HDB flat?

Indicatively for 2026: S$2,500–4,000 for a 3-room, S$3,500–5,500 for a 4-room and S$4,500–7,000 for a 5-room or executive, including a new distribution board. A partial rewire of only the failing circuits typically runs S$1,200–3,000.

How do I know if my flat needs rewiring?

Repeated tripping when appliances combine, warm or discoloured faceplates, rewireable fuses instead of breakers, two-pin sockets, lights dimming when the aircon starts, permanent extension cords: any two together justify an inspection. A burning smell justifies one immediately.

Do I need a Licensed Electrical Worker?

Yes. New wiring, new circuits and consumer-unit alterations must be done or supervised by a LEW under EMA's framework. Ask for the licence number before work starts.

How long does it take?

One to two days for a partial rewire; three to five working days for a full 4-room rewire, plus the plastering and repainting that follows any concealed work.

Can it be done without hacking the walls?

Often, by pulling new cable through existing conduit, or running new circuits in surface trunking. Whether the first is possible depends on conduit condition, which only a site visit reveals. Surface trunking is cheaper and stays visible.

Should I rewire before or after renovating?

Before, at first fix, after hacking and before plastering. Rewiring a finished flat means reopening walls you have just paid to finish.

Getting it done by RK E&C

RK E&C is a Singapore-registered renovation and handyman company (UEN 202442767D) working in HDB flats and condos island-wide. We handle rewiring, distribution board upgrades and electrical works with licensed electrical work priced into the quote from the start, and because we also do the plastering, patching and painting, the making-good after a rewire is part of the same job rather than someone else's problem.

Send us your flat type, its approximate age and a photo of your distribution board via our contact form or WhatsApp, and we'll arrange a site inspection and an itemised fixed-price quote. Browse our other guides for the rest of the trades.