How Much Does It Cost to Rewire an Old House in the UK?

How much does it cost to rewire an old house in the UK? It is one of the most common renovation cost questions buyers of period and older properties ask — and the answer is almost always higher than the electrical quote alone suggests.

Does an old house always need rewiring?

• Old-style fuse wire consumer unit rather than a modern RCD-protected board
• Round-pin sockets or single sockets rather than modern twin sockets
• Rubber or cloth-wrapped wiring visible anywhere in the property
• No earth connection on older two-core wiring
• No RCD protection — required for bathroom and kitchen circuits
• Evidence of DIY electrical work: cables clipped along skirtings, mismatched sockets and switches
• An electrical installation condition report (EICR) showing category C1 or C2 defects

What does a full house rewire cost in the UK?

For a typical 3-bedroom period property, a full rewire costs between £8,000 and £14,000 for the electrical work. This includes new consumer unit with full RCD protection, new cabling throughout, new sockets, switches and light fittings, smoke and carbon monoxide detectors, dedicated circuits for kitchen appliances, shower, and outdoor supply, and an electrical installation certificate on completion.

For larger properties — 4 or 5 bedrooms — expect £12,000–£20,000 for the electrical work itself.

What is the making good cost that buyers always forget?

Rewiring requires electricians to chase cables through walls, lift floorboards, and sometimes open ceilings. Once the electrical work is complete, every surface that was opened up needs reinstating — replastering chases, patching ceilings, making good floorboards. This is a separate cost that is almost never included in an electrician's quote.

For a full rewire on a 3-bedroom property, making good work typically adds £3,000–£6,000 to the total. The true cost of a full rewire on a 3-bedroom period property is therefore typically £11,000–£20,000 all in — not the £8,000–£14,000 the electrical quote alone suggests.

Why does understanding rewiring costs matter before you make an offer?

Many buyers receive a survey that says the electrics are "old" or "require updating" without any indication of what that will cost. By the time they have exchanged and begun getting quotes, they are committed to the purchase with a significant unexpected cost to absorb. Knowing the electrical scope — and its true all-in cost including making good — before you make an offer is the difference between a renovation budget that works and one that falls apart.