House Rewiring Guide 2026: Signs, Process & What To Expect

Rewiring is one of those projects that fills people with dread, partly because nobody wants the mess, and partly because the word is often used to mean everything when the actual job might be a lot smaller. This guide walks through how to tell if a full rewire is really what you need, what happens on the job, what I test to BS 7671:2018+A4:2026, and what to plan for.

Signs your house might need rewiring

Not every older house needs a full rewire. But if several of the following appear, it is worth getting an electrician in for a proper look:

• Round-pin sockets. Almost always pre-1960s, well past safe service life.
• Rubber or fabric-covered cable in the loft. Modern cable is PVC-sheathed. Rubber insulation goes brittle and cracks.
• Wooden-backed fuse box with rewireable fuses. Pre-1990s, no RCD protection, no compliance with current regulations.
• Frequent tripping or blown fuses. Occasional is normal. Repeated trips across circuits often mean insulation breakdown.
• Flickering lights across multiple rooms. Points at cable or connection issues rather than a bulb problem.
• Burning smell or discoloured sockets. Stop using and call an electrician the same day.
• No RCD protection. Modern shock protection is missing entirely.

How old is too old?

Electrical cable has a useful life of roughly 25 to 30 years before the insulation degrades enough to show up as a C2 on an EICR. But use matters as much as age. A busy family home running a washing machine, tumble dryer, dishwasher, electric shower and heat pump every day ages cable much faster than a quiet property. Same age, very different condition.

York has a lot of older stock, Victorian terraces, Edwardian semis, 1930s estates. Many have had partial updates over the years. Partial updates can mask problems if the older wiring underneath has not been assessed. A proper EICR tells you exactly where each circuit stands.

Full rewire vs partial rewire

What a rewire actually involves

A full rewire replaces every cable, back box and accessory in the house, plus the consumer unit. It is a big job, and it is also the best opportunity you will get to design the electrics you actually want: extra sockets where you use them, USB charging, outdoor power, EV charger circuit, smart lighting wiring. While walls and floors are open, the marginal cost of additions is small.

It is done in two phases with plastering in between:

• First fix. Cable pulled through walls, floors and ceilings. Back boxes installed. Consumer unit terminated. Dust sheets, protected furniture, clean-up every day.
• Plastering. Your plasterer makes good the channels and any patched ceilings.
• Second fix. Sockets, switches and light fittings installed. Final labelling inside the consumer unit.
• Test and certify. Every circuit tested. EIC issued on the day. Part P notified to NICEIC.

First fix, second fix, certification, step by step

1. Site survey and written estimateWe visit the property, map every circuit you want, discuss extras, and give you a detailed written estimate with every fitting listed.
2. Pre-start walk-throughA day before we start, we walk the house with the plan, mark every accessory position in pencil, and confirm cable routes. Last chance to move a socket.
3. First fixNew cable pulled, back boxes installed, consumer unit fitted. Floorboards lifted and relaid. Channels cut and filled ready for plaster. Dust sheets down every day.
4. Plaster and decoratePlasterer makes good the channels. Walls repainted. This stage is the householder's responsibility or a separate trade I can recommend.
5. Second fixSockets, switches, fittings and fire alarms installed. Everything terminated to torque spec.
6. Test and certifyEvery circuit tested for insulation resistance, continuity, polarity, earth fault loop impedance and RCD trip time. EIC issued on the day. Part P registered with NICEIC.

Living in the house during a rewire

In most cases, yes, you can stay. I work room by room, and at the end of every working day you have lighting and at least one working socket circuit. It is disruptive (dust, noise, some lifted floorboards), but it is manageable with planning. For larger rewires, or when someone in the household works from home, moving out for the first-fix week is sometimes easier.

What I'll do to minimise disruption:

• Dust sheets over furniture and floors in every working room.
• Clean-up at the end of every day, not just at the end of the job.
• A working route for the fridge, freezer and kettle throughout.
• Clear daily plan so you know which rooms are live tomorrow.

Upgrades worth considering while walls and floors are open

• Extra sockets and USB charging. Roughly one socket per wall is the modern expectation. USB-C built in is increasingly standard.
• Outdoor power and garden lighting. External socket, garden feature lighting, path lights, shed circuit.
• Dedicated EV charger circuit. Run the cable now even if the charger itself goes in later. Type B RCD or a charger with 6 mA DC sensing, per BS 7671:2018+A4:2026.
• Smoke and heat alarm upgrade. Interconnected Grade D2 system to BS 5839-6.
• Smart lighting. Wired smart switches or a mesh system. Cable back to a control cupboard.
• Spare conduit runs. Empty containment from the consumer unit to key locations, for whatever you cannot predict.

A note on cost

Every rewire is scoped on a site visit. The cost depends on property size, wall construction (solid, cavity, lath and plaster, plasterboard), how accessible the floors and ceilings are, the number of rooms, the fittings you choose, and any additional circuits being added. I give you a detailed written estimate before any work starts. Book a rewire survey.

A word on suspiciously cheap quotes

I'm not the cheapest electrician in York, and we never will be. From fifteen years of working with customers, one rule holds: buy cheap, buy twice. A bargain rewire usually means cheap cable, corners cut, and problems that show up six months later when the plasterer has long gone. Then you pay someone else to fix it.

If you are offered a rewire at a price that seems too good to be true, it probably is. Ask what is included, what cable brand and specification they are using, whether they will issue a full Electrical Installation Certificate, whether they are NICEIC-registered, and who notifies Building Control. The answers tend to separate the serious from the shortcuts.