Key Takeaways
- A full house rewire in the UK costs £3,000 to £10,000+, with London 20 to 30% higher (TradeCalcs / EcoFlow, 2025).
- A 3-bedroom semi typically costs £4,500 to £6,500 including labour, materials, consumer unit and certification.
- Rewiring is notifiable under Part P and must be certified by a qualified electrician.
- Best done during a renovation, before plastering and decorating.
- Signs you need a rewire include a fuse box with rewireable fuses, frequent trips and old rubber or fabric cabling.
Old wiring is a safety risk and a barrier to selling, and many London homes still have installations decades past their best. This guide covers what a rewire costs in 2026, the signs you need one, and the certification that matters.
How much does a house rewire cost in London?
A full house rewire in the UK costs £3,000 to £10,000 or more, with London running 20 to 30% above national rates, according to 2025 trade data. A typical three-bedroom semi costs around £4,500 to £6,500 including labour, materials, a new consumer unit and certification.
| Property size | Typical London cost |
|---|---|
| 1 to 2 bed flat | £3,500 to £5,500 |
| 3 bed house | £5,000 to £7,500 |
| 4 to 5 bed house | £7,500 to £12,000+ |
Signs you need a rewire
Have your wiring inspected if you notice any of the following, or if the home has not been rewired in 30 years:
- An old fuse box with rewireable fuses, or no RCD protection
- Frequent tripping, flickering lights or buzzing sockets
- Scorch marks around sockets or a burning smell
- Old rubber, fabric or lead-sheathed cabling
- Too few sockets, with extension leads everywhere
Part P and certification
Rewiring is notifiable under Part P of the Building Regulations and must be carried out and certified by a qualified electrician. On completion you should receive an Electrical Installation Certificate, which you will need for safety and when you sell. Always insist on it.
When to rewire
The best time to rewire is during a renovation, before plastering and decorating, because running cables and lifting floors is far cheaper when the property is already opened up. Rewiring is a core part of most of our full house renovations. For a free quote, contact us or call 07472 424 226.