Victorian terraces were built for gaslight, coal fires and a single cold tap in the yard. A hundred and thirty years later, the same house is expected to run an induction hob, a heat pump, a home office and a router in every room. Somewhere in the walls, the wiring has usually been left behind — and it is the one part of the house most owners never look at until a socket starts buzzing.

A rewire is not a small job, but it is a manageable one if you know what you are walking into. Here is what actually happens, in what order, and where it should sit in a wider renovation.

How to tell whether your terrace really needs rewiring

Older homes often have a patchwork: original rubber or fabric-covered cable in the front rooms, 1970s PVC in the kitchen extension, and a modern spur someone added for a shower. Warning signs worth taking seriously include round-pin sockets, black or fabric-wrapped cable, lighting circuits with no earth, and a fuse box with rewireable fuses or push-in breakers but no RCD protection.

Warm socket fronts, a persistent smell of hot plastic, a breaker that trips when the kettle goes on, or the need for an adaptor in every room are all reasons to stop and get the installation looked at. The sensible starting point is a periodic inspection from a registered electrician, which gives you a written report on what is safe, what is deteriorating and what has to be replaced. If you are buying the house, ask for one before you exchange — it is far cheaper than discovering the problem after completion.

What a full rewire involves

A rewire is two separate jobs. The first fix is the messy one: cables pulled through floors and walls, back boxes set into plaster, and a new consumer unit installed with individual RCBO protection. It also includes main protective bonding to the incoming gas and water supplies, and dedicated circuits for the kitchen, boiler, shower and any outbuilding.

The second fix happens after plastering, when sockets, switches, light fittings, extractor fans and alarms go on. It usually takes a day or two, but it cannot be rushed, because every fitting has to be tested and the whole installation certified.

Worth planning in at the same time

• Sockets in sensible places — beside beds, under windows for lamps, where a desk or television will actually be.
• Interlinked mains smoke and heat alarms, which are easier to wire now than retrofit later.
• Network cable to a central cupboard, plus coax or satellite feeds if you use them.
• A cable run to the drive for a future EV charger, and to the loft or garden for solar and battery equipment.
• External sockets, garden lighting and a doorbell transformer.
• Spare capacity in the consumer unit. You will add something later.

What drives the cost

Quotes for a rewire vary enormously, so treat any headline figure you read with caution. The real drivers are the number of points, the size of the house, how much access there is behind floors and ceilings, and how much of the house is already stripped out. A rewire done as part of a full renovation, with floors up and walls bare, will cost less per point than one done in a furnished, occupied home where every carpet has to be lifted.

Other things that push the price up include chimney breasts and lath-and-plaster walls, a consumer unit that has to move, a supply or meter upgrade arranged with the network operator, and any building control or listed building consent you need. Ask for an itemised quote so you can see what is included, and check specifically which of these are excluded:

• Making good plaster after chasing and lifting boards
• Skimming ceilings and walls
• Re-fitting or replacing skirtings and architraves
• Skip hire and waste removal
• Testing, certification and building control notification

The cheapest quote is often the one that leaves you to sort the plastering. For anything involving contracts, deposits or building regulations, it is worth taking proper advice rather than relying on a handshake.

The disruption, honestly

Expect dust in places you did not know you had, and expect it to travel. A full rewire of a three-bedroom terrace is measured in weeks, not days, because the electrician shares the house with the plasterer, the plumber and possibly the roofer.

Power will be off for stretches of the working day. If you stay in the house, agree with the electrician which circuits stay live and when, and move anything valuable out of the rooms being worked on. Most families find that living through a rewire room by room is possible but slow, and that an empty house is finished faster and cheaper.

Victorian lathe-and-plaster ceilings are the main casualty. They do not take new holes neatly, and you should budget for patching or a full skim once the cables are in. Floorboards are the second casualty — boards lifted with a saw rarely go back flush, so ask for them to be lifted and numbered rather than cut.

Protecting period features

The good news is that a rewire can be done largely out of sight. Cables can often run under floors, up behind skirtings and through existing voids rather than being chased into decorative walls. Original cornices, ceiling roses, picture rails and dado rails are the parts most easily damaged and the hardest to replace, so mark them in advance and talk through the cable routes before work starts.

If your terrace is listed, or sits in a conservation area, check with the local planning authority before anything is cut, drilled or removed. Internal alterations in a listed building may need consent, and a rewire that disturbs historic plasterwork usually counts.

Where rewiring fits in a renovation

Sequence matters more than anything else. Get the order wrong and you will be paying twice.

1. Survey and design. Decide the layout, kitchen position, bathroom, lighting plan and where the consumer unit will live.
2. Strip out. Remove old wiring, redundant heating and anything being demolished, including chimney breasts.
3. Structural and damp work. New joists, steels, tanking and roof repairs all happen before cables go in.
4. First fix. Electrics, plumbing and ventilation run side by side. Photograph every wall and floor before it is covered.
5. Insulation and plastering. Boarding, sound insulation, then plaster. Nothing gets second-fixed until this is dry.
6. Second fix. Sockets, switches, lights, alarms, consumer unit connection and testing.
7. Kitchens, bathrooms and decoration. Fitted furniture goes in last, once the certificate is in your hand.

Practical steps before the first cable goes in

Use an electrician registered with a competent person scheme, and confirm in writing that they will notify building control and issue an Electrical Installation Certificate along with the test results. Keep those documents — they matter when you sell, and again when you insure or remortgage.

Write a room-by-room socket plan based on where furniture will actually stand, then add a little more. Label the consumer unit clearly. Agree a daily routine for dust sheets, power and access, and keep a copy of the cable routes and photographs somewhere safe. A rewire is the one chance you get to put everything where you want it — take the extra evening to plan it properly, and the next thirty years of the house will thank you.

Photo: lecreusois / Pixabay