Electrical Rewiring Costs in Wales 2026
Full house rewiring costs in Wales in 2026 depend primarily on property size and the number of circuits and sockets required.
Typical full rewire costs in Wales:
| Property size | Typical cost range |
|---|---|
| 1-bed flat | £1,800–£3,500 |
| 2-bed house | £2,500–£4,500 |
| 3-bed semi | £3,500–£6,500 |
| 4-bed detached | £5,000–£9,000 |
| 5-bed detached | £7,000–£12,000+ |
Costs above include: removal of old wiring, first and second fix of new cables, consumer unit replacement, all new sockets and switches, testing, and certification.
Additional costs to budget for:
- Plastering/patching after rewire: £500–£2,000 for a typical semi
- Decoration after plastering: £1,000–£3,000 for a full repaint
- EV charger addition: £500–900
When Does a House Need Rewiring in Wales?
Welsh housing stock includes significant numbers of older properties whose wiring is approaching or past its safe service life:
Definite rewire needed:
- Round-pin sockets (pre-1947 wiring)
- Rubber-insulated wiring (brittle and cracked with age)
- Rewirable fuses in the consumer unit (no MCBs)
- Aluminium wiring (installed in some 1960s–70s properties)
- EICR result of Category 1 (immediate danger) or multiple Category 2 defects
Consider rewiring:
- Houses built before 1970 not rewired since
- Wiring showing signs of overheating (brown marks around sockets)
- Persistent RCD tripping without explanation
- Before major renovation where replastering will happen anyway (rewiring during a renovation saves significant cost and disruption)
In Welsh valleys housing, particularly 1930s and 1950s coal board housing, old wiring with inadequate earthing is common. An EICR will identify problems.