Key Takeaways
- An old fuse box with rewireable fuses or no RCD is a key warning sign.
- Frequent tripping, flickering lights and a burning smell need urgent attention.
- Old rubber, fabric or lead-sheathed cabling is unsafe and should be replaced.
- Any home not rewired in 30 years should be inspected.
- A rewire is best done during a renovation, before plastering.
Old electrics are a hidden hazard in many London homes, and they often only get attention once something goes wrong. Here are the warning signs that your home needs rewiring, and what to do about them.
The warning signs
- An old fuse box with rewireable fuses or no RCD protection.
- Frequent tripping or blown fuses.
- Flickering or dimming lights.
- Scorch marks or discolouration around sockets.
- A burning smell from outlets or the consumer unit.
- Buzzing sockets or switches.
- Small shocks from switches or appliances.
- Old rubber, fabric or lead-sheathed cabling.
- Too few sockets, with extension leads everywhere.
- No rewiring in 30 years or more.
Why it matters
Degraded wiring is a genuine fire and electrocution risk, particularly without modern RCD protection. If you notice scorch marks, a burning smell or shocks, treat it as urgent and call a qualified electrician. An Electrical Installation Condition Report (EICR) formally assesses the condition and advises whether a full rewire or specific remedial work is needed.
Cost and timing
A full London rewire costs roughly £4,000 to £10,000+, with a three-bed home typically £5,000 to £7,500 including a new consumer unit and certification. The best time is during a renovation, before plastering, when cables can be run easily. See our house rewire cost guide. For an inspection and quote, contact us or call 07472 424 226.