How much does it cost to rewire a 3-bedroom house in the UK? Expect £4,000–£7,000 for a full rewire of a typical 3-bed semi or terrace, including a new consumer unit — or £5,000–£9,000 in London and the South East. It’s disruptive, dusty and expensive, but old wiring is one of the few genuine safety emergencies in homeownership: faulty electrics cause thousands of house fires a year. If your house still has a fuse box, rubber-insulated cable, or wiring older than 30 years, this isn’t optional maintenance — it’s essential.
Rewiring cost breakdown for a 3-bed house
- Full rewire (labour + materials): £4,000–£7,000 for a standard 3-bed (outside London).
- London / South East: £5,500–£9,000 — labour rates are the driver.
- New consumer unit alone: £400–£800 (if the wiring’s fine but the fuse box is ancient).
- Making good (plastering): £1,000–£2,500 — chasing cables into walls means replastering. Often quoted separately; always ask.
- Extras: additional sockets (£80–£150 each), new light fittings, outdoor electrics, smoke/heat alarms to current regs.
Checkatrade’s rewiring cost data confirms the £4,000–£7,000 band for 3-bed houses from real quotes.
Signs your house needs rewiring
- Fuse box instead of a consumer unit with RCD protection — the clearest sign.
- Rubber or fabric-insulated cable (pre-1960s) — the insulation crumbles with age. Black rubber cable in the loft is the telltale.
- Frequent tripping, flickering lights, or buzzing sockets.
- Scorch marks or a burning smell near sockets — call an electrician immediately, don’t wait.
- Not enough sockets — extension leads everywhere is both a symptom of old wiring and a fire risk itself.
- No earth on lighting circuits — common pre-1970s, means metal light fittings are unsafe.
- An unsatisfactory EICR — an Electrical Installation Condition Report (£150–£300) gives a definitive verdict. Get one if the wiring’s age is unknown.
What the job actually involves
A full rewire means replacing all cable, sockets, switches and the consumer unit — typically 5–10 days for a 3-bed house. The electrician lifts floorboards, chases channels into walls for cables, runs new circuits (sockets, lighting, cooker, shower, smoke alarms), fits a modern consumer unit with RCBO protection, then tests everything and issues an Electrical Installation Certificate plus Part P building regulations compliance.
It’s notifiable work — it must be done by a registered electrician (NICEIC, NAPIT or ELECSA registered) who can self-certify, or notified to building control. Check your electrician’s registration on the NICEIC website — unregistered electrical work is illegal and invalidates your insurance.
How to minimise the disruption (and cost)
Do it empty if possible. Rewiring an empty house (between purchase and moving in, or during an extension) is 20–30% cheaper and infinitely less miserable — no furniture to move, no dust on your belongings, no living around the work. If you’re buying a fixer-upper, schedule the rewire before you move in. This is the single best piece of rewiring advice there is.
Combine with other work. If you’re replastering anyway, the “making good” cost vanishes. If you’re renovating the kitchen or bathroom, coordinate the electrical work — one lot of disruption, one lot of making good.
Plan socket positions generously. While the walls are open, adding sockets costs £80–£150 each vs £200+ as a standalone job later. Think about where you’ll actually charge phones, work from home, and put the TV. Future-you will thank present-you.
Get three quotes from registered electricians, itemised: rewire cost, consumer unit, making good (included or separate?), certification, and extras. The cheapest quote that skips making good isn’t the cheapest.
Partial rewire vs full rewire
Sometimes only part of the installation is bad — a DIY extension wired by someone’s uncle, for example. A partial rewire (£1,500–£3,000) fixes the dangerous bits. But if the whole installation is 40+ years old, partial fixes are false economy — the rest will fail soon enough, and you’ll pay the disruption cost twice. Your electrician’s EICR will guide the decision.
The EICR: what it actually covers
An Electrical Installation Condition Report (£150–£300 for a 3-bed house) is the definitive verdict on your wiring — get one before committing to a rewire, as it might save you thousands. The electrician tests every circuit and codes each finding: C1 (danger present — immediate action), C2 (potentially dangerous — urgent remedial work), C3 (improvement recommended — not dangerous), and FI (further investigation needed).
How to read it: any C1 or C2 means the installation is unsatisfactory — but it doesn’t automatically mean a full rewire. A handful of C2s (no RCD protection, undersized bonding) might be fixed for £500–£1,000. Widespread C2s across every circuit, or C1s on the wiring itself, point to a full rewire. Get the electrician to talk you through it in plain English — a good one will distinguish “this needs doing now” from “this would be nice”. And keep the report: landlords need a satisfactory EICR by law, and buyers increasingly ask for one.
Future-proofing: wiring for the smart home
While the walls are open for a rewire, future-proofing costs little and saves fortunes later. Run Cat6 ethernet to the living room, home office and TV positions (£30–£50 per run while walls are open vs £150+ retrofitted) — Wi-Fi is convenient but wired is faster and more reliable for working from home. Add extra-deep back boxes on sockets (£1 extra each) — they accommodate smart switches and USB sockets that shallow boxes can’t.
Consider neutral wires at light switches (required by most smart switches — standard UK lighting circuits often lack them; adding them during a rewire costs nothing extra). And run a dedicated circuit for any planned EV charger, hot tub or workshop — the cable is cheap while the floor’s up; retrofitting it later means digging up the drive. A rewire happens once every 30 years — wire for the next 30, not the last 30.
The takeaway
Budget £4,000–£7,000 (£5,500–£9,000 in London) for rewiring a 3-bed house, use only registered electricians, and if at all possible do it while the house is empty. Add generous sockets while the walls are open, get the certification paperwork, and treat the making-good cost as part of the budget from day one. It’s the least glamorous money you’ll spend on your house — invisible once done — and the most important for keeping everyone in it safe. Once the electrics are modern, smart upgrades become easy — see how to install a smart thermostat yourself.
