Electrical Rewiring Cost in Singapore

Rewiring is the electrical job most homeowners discover late — usually after hacking opens a wall in an older flat, or when an ageing distribution board keeps tripping. As an illustrative 2026 industry figure, a full HDB rewire runs about S$2,500–S$4,000 for a 3-room flat, S$3,500–S$5,500 for a 4-room and S$4,500–S$7,000 for a 5-room or executive, with a new distribution board included. A partial rewire of only the failing circuits is typically S$1,200–S$3,000. These are compiled market ranges, not quotes, and not official figures — EMA does not regulate what a Licensed Electrical Worker charges. This guide is the cost companion to the broader electrical works rules and costs page: here the focus is the rewiring decision and what drives its price.

When a flat actually needs rewiring

Rewiring is expensive, so the first money question is whether you need a full rewire, a partial one, or none at all. HDB’s own guidance is the anchor: PVC electrical cables have an estimated average life of about 25 years, and wiring should be replaced once it is past its lifespan. That makes a flat’s age the strongest single signal.

Beyond age, the warning signs are practical: breakers that trip frequently, sockets or switch plates that feel warm or look discoloured, lights that dim when an appliance starts, and a distribution board still using old rewireable fuses rather than modern circuit breakers. Older HDB flats from the 1980s and 1990s often still run on the original roughly 30-amp single-phase supply with a small distribution board, which a modern load — aircon in every room, an instant water heater, an induction hob — pushes to its limit. If your flat shows these signs, have a Licensed Electrical Worker inspect before you assume the worst; sometimes a board upgrade and a few dedicated circuits are enough.

What a full rewire includes

Knowing what a full rewire covers tells you whether a quote is complete. A standard full HDB rewire typically includes:

• New cabling throughout — lighting circuits, socket circuits and dedicated runs, pulled through existing conduit or newly chased into walls.
• A new distribution board — 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 down with it.
• Dedicated circuits for heavy loads — water heater, oven, induction hob and aircon each get their own run.
• New accessories — sockets, switches and faceplates, which rarely survive the change.
• Testing and certification by the LEW who signs the installation off.

If a quote omits the board, the dedicated circuits or the testing, it is not pricing a full rewire — it is pricing part of one.

What rewiring costs in 2026

Treat every figure below as an illustrative industry range for 2026, not a quote or an official price. Ranges differ widely between contractors, so use them to sanity-check a quotation, not to hold anyone to a number.

Illustrative full HDB rewire cost (upper of range, distribution board included), 2026.

Illustrative ranges compiled from 2026 industry price guides (RKEC, MM Engineering, Fortified); figures usually exclude 9% GST. Confirm with a written quote.

The spread is real: some contractors quote a 3-room full rewire from as low as S$1,800 and others toward S$4,000, depending on point count, access, the brand of accessories and the flat’s condition. The reliable move is to count points room by room and get the scope itemised, not to anchor on the lowest headline.

The distribution board is its own cost

The distribution board — the “DB box” — is a significant line within a rewire, and sometimes the only work you actually need. A straightforward MCB/RCCB upgrade (replacing breakers and adding residual-current protection on sound wiring) runs roughly S$380–S$700, while a full board replacement — new enclosure, new breakers, new RCCB, relabelling and testing — is roughly S$700–S$1,800, more for larger landed boards. A rewire almost always includes a new board because the old one is usually the same age as the cabling.

The board is also where the mandatory RCCB lives. Every residential premises must have an RCCB or ELCB rated at not more than 30mA, and homes without one can face a fine of up to S$5,000 since enforcement began on 1 July 2025 — so flats built before 1985, which did not come with one, should have it fitted during any rewire. The electrical works rules page covers the RCCB rule in full.

Concealed vs surface, and “making good”

How the cable is run is one of the biggest price swings in the whole job. Surface trunking — cable in PVC casing fixed to the wall — is the cheaper option because it needs no hacking. Concealed wiring — chased into the wall and plastered over — looks cleaner but adds roughly 30–50% over surface trunking once you count the slotting, conduit, plastering and repainting.

That last stage, “making good,” is the line most quotes quietly omit. A rewire quote may price the electrical work and stop there, leaving you with sound cabling inside scarred walls. Making good after concealed work is an illustrative S$400–S$1,200. Ask explicitly whether it is included, and if not, price it now.

Resale vs BTO and condo

Where you live changes the bill. A new BTO almost never needs rewiring — its cabling and board are new — so “electrical” there means renovation wiring for new points, not a rewire. A resale flat, especially an older one, is the classic rewire case: ageing cable, an undersized board and a load the original design never anticipated. That is a major reason resale renovations run higher overall, as the resale flat renovation cost guide sets out.

A condo typically costs more than an HDB flat of similar bedroom count — longer cable runs, more points, and coordination with the MCST for any work touching shared services — with 2–3 bedroom rewires reaching S$3,000–S$9,000 in industry ranges. The condo renovation rules and costs guide covers the MCST side.

The rules in brief (and why they add time)

Rewiring is regulated, and the rules shape both cost and schedule. In short:

• The work must be carried out or supervised by an EMA Licensed Electrical Worker (LEW); a handyman cannot legally rewire. Electrical workers are licensed under section 82 of the Electricity Act 2001.
• New wiring, rewiring and extensions must be tested by SP Services before supply is turned on — in an HDB flat via the SP Services Form CS/5H endorsed by HDB. Build that submission-and-test window into your schedule; power does not come back the moment the electrician packs up.
• HDB rules cap how wiring is run (no embedding in RC slabs/beams/columns; nails and screws limited to 6mm diameter and 40mm penetration), and a flat without higher electrical loading needs an HDB permit to add new 15-amp points.

For the full detail on LEW classes, the permit triggers and certification, see the electrical works rules and costs guide and the HDB renovation permit guide.

How to budget and vet the quote

A sound rewiring quote should let you check the arithmetic, not just the total:

1. Count the points room by room — sockets, lights, data and aircon — and have each priced, with the rate for extra points stated.
2. Confirm the board — whether it is replaced, how many ways, and how many spare circuits.
3. Pin down concealed vs surface for each area, and whether making good is included.
4. Check testing is in scope — insulation resistance, earth continuity and RCCB operation, with the certificate provided.
5. Confirm GST — many quotes exclude 9% GST, so a tax-exclusive quote is not comparable to a tax-inclusive one.

FAQ

How much does it cost to rewire an HDB flat? Indicatively for 2026, about S$2,500–S$4,000 for a 3-room, S$3,500–S$5,500 for a 4-room and S$4,500–S$7,000 for a 5-room or executive, with a new distribution board. A partial rewire of only the failing circuits runs about S$1,200–S$3,000. These are illustrative ranges, not quotes.

Is a distribution board upgrade part of the rewire? Almost always. A standalone MCB/RCCB upgrade is roughly S$380–S$700 and a full board replacement about S$700–S$1,800, but a full rewire bundles a new board in.

Why is concealed wiring more expensive? It requires chasing the wall, laying conduit, plastering and repainting — adding roughly 30–50% over surface trunking. Budget separately for “making good” if it isn’t in the quote.

Can I rewire part of the flat to save money? Yes — a partial rewire renews only the failing circuits and can keep a sound board, for about S$1,200–S$3,000. Have an LEW confirm the rest of the wiring is safe to keep.

Do I legally need a licensed electrician? Yes. Rewiring must be done or supervised by an EMA Licensed Electrical Worker and tested by SP Services before power is restored. A handyman cannot legally do it.

Related

• Electrical works: rules and costs
• Resale flat renovation cost
• Condo renovation rules and costs
• HDB renovation permit guide
• How to save on your renovation
• How to choose a renovation firm

General information only, not legal or electrical advice. Cost figures are illustrative industry ranges (approximate, 2026), not quotes; safety rules and requirements are from EMA and HDB. Rules and prices change — confirm current figures with EMA, HDB and a Licensed Electrical Worker before you start.