A house needs rewiring when the fixed wiring is no longer safe or able to cope with what the home asks of it. There is no fixed lifespan, but the clearest signs are rubber or fabric-insulated cabling, a fuse box with rewireable fuses, no RCD protection, warm sockets, and repeated breaker trips. An EICR is the reliable way to confirm whether a rewire is actually needed, and the cost depends on the size and age of the property.
Key takeaways
- Age alone does not decide it. Rubber, fabric, or lead-sheathed cable is the clearest sign that replacement is overdue.
- A 3 bedroom house rewire typically takes 3 to 5 days empty, or 6 to 10 days occupied, and every job is estimated individually.
- Most families stay in the property throughout. Circuits are phased so kitchen, heating, and essential lighting stay live.
- You receive an Electrical Installation Certificate and a Building Regulations Compliance Certificate at handover. Keep both with the house.
- Listed buildings and conservation areas in Bath and Wiltshire may need Listed Building Consent before chasing walls or lifting protected floors.
Most houses only get rewired once every fifty years or so. That means most owners have never lived through one, and the question of whether it’s time is usually answered by an electrician after an inspection, not by the owner themselves.
There are some fairly reliable indicators that a rewire is due. If several of the following apply, book an EICR (see our EICR cost guide), and expect the conversation to turn towards a rewire.
1. The wiring has never been updated
There is no fixed lifespan for house wiring. PVC-insulated cable, used from the 1960s onwards, can last for decades if it was installed well and never overloaded, but the connections, accessories, and consumer unit around it usually wear out sooner. If the wiring in an older home has never been updated, it is worth having it inspected.
2. Rubber, fabric, or lead-sheathed cabling
These are the tell-tale signs of pre-1960s installations. Rubber insulation degrades and cracks, exposing conductors. Fabric-covered (TRS) and lead sheathed cable are fine when first installed but brittle by the time they are this old. If any survives in your property, replacement is not a question of if, but when.
3. A round-pin socket, even one
Round-pin sockets belong to a 15A / 5A radial system that was gradually replaced from 1947 onwards, once BS 1363 introduced the 13A three-pin plug and the modern ring circuit. Finding even one round-pin socket means at least one part of the installation was never brought up to standard.
4. A fuse box with rewireable fuses
If your consumer unit uses wire fuses that you replace with a screwdriver and a length of fuse wire, the fuse box itself is due for retirement. Modern consumer units use miniature circuit breakers (MCBs) and residual current devices (RCDs). Since Amendment 2 to BS 7671 (2022), 30 mA RCD protection is required on nearly all final circuits, and Amendment 4 (published April 2026) extended it further to AC lighting circuits in dwellings. Consumer units built to the current standard use an RCBO per circuit as the default.
5. No RCD protection at all
If your installation has no RCD protection, and you rely purely on fuses or MCBs, you have no earth-leakage protection on any circuit. That is a fail on modern standards.
6. Sockets that get warm to the touch
A warm socket usually means a loose or corroded connection, and the accessory is dissipating heat where it should not. Occasionally it’s the appliance drawing too much, but on a socket that runs warm with light loads, the cause is in the wiring.
7. Frequent breaker trips or blown fuses
Occasional trips are normal. Repeated trips on the same circuit, especially with no obvious cause, point to insulation breakdown, a nuisance-tripping RCD reaching the end of its life, or an overloaded circuit that was never sized for the current use.
8. Scorch marks around sockets or switches
Any scorching, discolouration, or melting around a socket, switch, or the consumer unit is a stop-everything sign. Isolate the circuit at the consumer unit and call an electrician the same day.
9. A buzzing or humming from the consumer unit
A well-maintained consumer unit is silent. Buzzing usually means a loose neutral, a failing MCB, or an accessory going bad.
10. Lights that flicker or dim under load
Occasional flickering during a kettle boil is normal on a marginal supply. Persistent dimming when appliances turn on suggests undersized cables or a loose main terminal.
11. A failed EICR with multiple C2 codes
If your EICR comes back Unsatisfactory with C2 codes on more than a couple of circuits, remedial work may be more expensive than a full rewire when totalled up. An honest estimate will lay both options out side by side.
12. You want an EV charger, a heat pump, or a full solar and battery install
Modern loads are much heavier than they were even ten years ago. A supply that was fine for a family in 1985 may not have capacity for a 7 kW EV charger, a heat pump, and modern kitchen appliances at the same time. Sometimes the answer is a supply upgrade with the DNO; often it’s a consumer unit change or a partial rewire alongside the EV work. On the EV side we install Simpson & Partners chargers as our preferred domestic option, and it is common for us to estimate a consumer unit change (and sometimes a partial rewire) as part of the same visit.
What affects the cost of a house rewire?
Every rewire is estimated individually, because the cost is driven by the number of rooms and circuits, the age and construction of the property, how easy it is to run new cable, and whether you stay in during the work. Older homes with solid walls, original features or several outbuildings take longer than a modern house of the same size.
Your written estimate sets out exactly what is included, including whether making good the plaster is part of the job, so you can compare like with like.
| Property size | Empty property | Occupied |
|---|---|---|
| 1 to 2 bedroom flat | 3 to 4 days | 5 to 7 days |
| 3 bedroom house | 3 to 5 days | 6 to 10 days |
| 4 to 5 bedroom house | 5 to 8 days | 10 to 15 days |
| Period or listed property | By survey | By survey |
Typical time on site. Your survey and free written estimate confirm the programme for your home.
Do you have to move out during a rewire?
An empty property rewires in 3 to 5 days for a 3-bedroom house. Occupied, the same job takes 6 to 10 days because circuits are phased so kitchen, essential lighting, and heating stay live where possible. Most families stay in for the duration. A short break (a weekend or a school-holiday week) is worth it if the rest of the house is being redecorated at the same time.
What paperwork do you get after a rewire?
A full rewire produces:
- Electrical Installation Certificate (EIC), listing every new circuit and its test values
- Building Regulations Compliance Certificate, issued under Part P via the NICEIC scheme
- Updated circuit chart mounted inside the consumer unit
- An “as-fitted” record of any variation from the original estimate
Keep the paperwork with the house. It reassures buyers, insurers, and any future contractor working on the installation.
What changes for listed buildings and conservation areas?
Listed buildings and homes in a conservation area often need extra permissions before a rewire can start. Listed Building Consent may be required for chasing walls, junction-box positions, and lifting protected floorboards. Any change that is visible from a public thoroughfare (external light fittings, meter cabinets, EV charger housings) can also fall under the local planning authority.
This matters in Bath, Corsham, Bradford-on-Avon, and many Wiltshire villages, where a significant share of the housing stock is listed or in a conservation area. We regularly work on period properties in the area, from barn conversions to Victorian terraces, and we handle the coordination with conservation officers as part of the estimate.
When is a partial rewire enough?
Not every rewire has to be everything at once. A partial rewire targets the circuits that need attention, whether that’s the kitchen ring, the upstairs lighting, or the shower supply. It’s a good option when the rest of the installation is sound but one area is not.
An EICR (start with our EICR testing page) is almost always the sensible first step. It gives you an evidence-based answer to the “do I need a rewire” question, and the report is useful whatever route you take from there. For the full rewire process from survey to certificate, see our house rewire page.
If you’re in Chippenham, Bath, or the wider Wiltshire area and want a conversation about your installation, get in touch.
Service areas: Nulectrics is based in Chippenham, Wiltshire. We cover domestic work across Chippenham, Corsham, Calne, Melksham, Devizes, Trowbridge, Bath and the surrounding area, and commercial work UK-Nationwide.