Signs your house needs a rewire

• Rubber or lead cable means a rewire is due
• Pre-1970s wiring that has never been replaced
• Two bed terrace from £3,400, three bed semi from £4,200
• Expect five to ten days of disruption

“Does it need a rewire?” is a question we get asked at nearly every first visit to an older house, and the honest answer is usually “let’s find out properly”. A lot of homes on the Fylde coast are between 70 and 120 years old: the 1930s semis in Poulton and Bispham, the Edwardian terraces in Fleetwood and Layton, the big Victorian houses on the South Shore. This guide lists the signs that point to a rewire, and what to do about them before anyone gives you a price.

How long wiring lasts

There is no fixed lifespan for wiring, but there are rules of thumb. The PVC-insulated cable used since the 1960s is generally expected to last 50 years or more if it has not been overloaded or damaged. Rubber-insulated cable, used until the late 1950s, is now 65 years old at the youngest and has usually gone brittle. Lead-sheathed cable from the 1930s is older still. The wiring regulations, BS 7671, are updated regularly, so an installation that was fine when it went in may not give the protection a new one would, even if nothing has worn out.

What has been done since matters too. A 1970s rewire with three kitchens and a loft conversion bolted on may be in worse shape than an untouched 1980s one.

Eight warning signs

Rubber, lead or fabric-covered cable

If you can see cable in the loft or under the stairs with a black rubber coating, a dull grey lead sheath, or a woven fabric finish, it is well past its life. Rubber insulation goes hard and crumbles when disturbed, leaving bare copper. Do not handle it; look, then get it inspected.

Round-pin sockets

Older sockets with two or three round holes rather than the modern flat-pin pattern mean the circuit that feeds them is pre-1950s. You may find one or two left in a hall or on a landing, usually for a lamp, after a partial rewire.

Brown Bakelite switches and sockets

Dark brown or black switches and sockets with a glossy, slightly marbled finish were standard before and just after the war. They are not dangerous in themselves, but they date the wiring behind them.

No earth on the lighting circuit

Houses wired before the mid-1960s often have no earth wire to the light fittings. That means a metal light fitting or switch cannot be made safe, and it is why we sometimes have to tell people their new brass pendant cannot go up. An EICR will pick this up.

A very old fuse box

A wooden-backed fuse board, cast-iron switches, or a box with rewirable fuses and no RCD is usually the same age as the wiring behind it. Our guide on signs your fuse box needs replacing goes into detail.

Scorch marks and a fishy smell

Brown marks around a socket or switch, warm faceplates, or a hot plastic smell near a fitting mean something is overheating. Stop using that socket and get it looked at. This one is urgent whether or not the house needs a rewire.

Flickering lights and tripping

Lights that dim when the kettle goes on, fuses that blow regularly or an RCD that trips without reason can point to loose or deteriorating connections. Our guide on why an RCD keeps tripping covers the homeowner checks.

Sockets on extension leads everywhere

Not a fault, but a symptom. A house wired in the 1960s might have one socket per room. If every room has a four-way adaptor and an extension lead under the carpet, the installation is being asked to do something it was not designed for.

Get an EICR first

Before anyone talks about rewiring, get an EICR. An electrical installation condition report is a proper inspection and test of the fixed wiring, with every problem graded by how urgent it is. It tells you whether the house needs a full rewire, a partial one, or a few repairs and a new consumer unit. Our EICRs start from £120 including VAT for a one- or two-bedroom home, from £150 for a three-bedroom and from £180 for four bedrooms and up, with the report back within 48 hours.

We tell customers at least once a week that they do not need the rewire they came to us expecting. A report costs a fraction of a rewire, and a firm that quotes for a rewire without one is guessing.

Full vs partial rewire

A full rewire replaces every cable, socket, switch, light fitting and the consumer unit, back to the meter. It is the right answer when the cable is rubber or lead, when there is no earth, or when the house is being gutted anyway.

A partial rewire replaces the worst of it and keeps the rest. Common versions are rewiring the kitchen and bathroom circuits, replacing the lighting circuits to get an earth, or rewiring one floor. It makes sense when an EICR shows that part of the house was done properly in the 1990s and part was not touched. The new and old parts are tested together and the certificate records exactly what was replaced.

What we will not do is “just add a new fuse box” to rubber wiring. A modern consumer unit on cable that cannot hold its insulation will trip constantly and does nothing for safety.

Living through a rewire

A rewire comes in two halves. First fix is the messy part: lifting floorboards, chasing channels into plaster for the new cables and back boxes, running cables through the loft and under floors. Second fix is fitting the sockets, switches and lights, connecting the consumer unit and testing. Between the two the plasterer fills the chases, and after second fix you decorate.

A two-bedroom terrace takes us around five to seven working days. A three-bedroom semi is more like seven to ten, longer if it has solid floors or a loft conversion. We work room by room so you keep power to the rooms we are not in, and you can live in the house throughout, though many people go to a relative’s for the first-fix week.

The house will be dusty, the carpets will come up, and every room will need some decorating afterwards. If you are planning a new kitchen or bathroom, the rewire goes first.

What it costs

Our guide price for a full rewire of a two-bedroom terrace is from £3,400 including VAT, and from £4,200 for a three-bedroom semi, to a standard specification of lighting and sockets with a new metal consumer unit, testing, certificate and building control notification. Larger houses, more sockets than standard, solid floors, high ceilings and anything over three storeys push it up. Partial rewires are quoted after the EICR.

Every quote is written and itemised, and plastering and decorating are listed separately so you can choose who does them.

Planning extras while the walls are open

A rewire is the one time adding things is cheap, because the floors are up and the plaster is coming off anyway. Think about:

• More sockets, especially double sockets by the bed and behind the TV, and a socket in the loft or landing cupboard.
• Sockets with built-in USB-C charging in the kitchen and bedrooms.
• A network cable to the main TV spot and a home office, which beats Wi-Fi through thick Victorian walls.
• An outdoor socket at the back door and a supply to the shed or garage.
• A spare way and cable route for an EV charger, even if the car is a few years off. Our EV charger guide explains what the charger itself will need.
• Interlinked smoke and heat alarms on every floor, which we fit as standard on a rewire.
• A cable for an electric shower or a hot tub supply if either is on the wish list.

Tell us at the survey stage. A socket added during first fix costs very little; a year later it means chasing a freshly decorated wall.

Need a hand?

If any of the signs above look familiar, start with an EICR and we will tell you honestly whether a rewire is needed. Our rewires page covers what the job involves and the EICR and landlord certificates page covers the report. Get in touch through the contact page.