A full house rewire is the most extensive electrical project most homeowners will undertake. It involves removing and replacing virtually all fixed wiring — lighting circuits, power circuits, and the consumer unit — along with all back-boxes and accessories. Done well, a rewire provides a safe, certificated installation that meets current standards and requires no major attention for 25–30 years. Done poorly, it creates problems that are expensive and disruptive to put right.
Signs a Rewire Is Needed
An EICR is the definitive way to establish whether a rewire is necessary, but there are visible warning signs. Rubber or cloth-insulated wiring (pre-1966) is beyond its safe service life and should be replaced. Round-pin sockets indicate original 1930s–1960s wiring. Black plastic accessories (rather than white) may date from the 1970s–1980s, when aluminium wiring was sometimes used — a serious concern if confirmed. A wiring survey from a registered electrician will establish the condition without assumptions.
"Wiring with rubber insulation (pre-1966) is beyond its expected service life. The rubber becomes brittle and cracks over time, exposing conductors. We recommend replacement rather than continued reliance on deteriorated insulation."— NICEIC — Older Wiring Guidance
What a Full Rewire Includes
A standard domestic rewire includes: all lighting circuits (new cable, new ceiling roses or back-boxes for pendants, new switches); all power circuits (ring mains, spurs, dedicated circuits for cooker, shower, and other high-demand appliances); a new consumer unit complying with current standards (metal enclosure, RCDs or RCBOs, appropriate circuit breakers); bonding of water and gas services; testing of the completed installation to BS 7671; and a full Electrical Installation Certificate with test schedule.
First Fix and Second Fix
A rewire happens in two stages. First fix is the cable-chasing stage: channels are cut in plasterwork, cables are routed, back-boxes are set. This is the disruptive part — rooms need to be cleared and the house is genuinely dusty and difficult to live in during this phase. After first fix, a plasterer makes good the channels and any damage. Second fix takes place once the plaster has dried: consumer unit installation, fitting of switches and sockets, commissioning and testing. The finished installation then needs decorating.
Coordinating with Other Trades
A rewire is often the right time to have other concealed services updated — plumbing, heating pipework, or building works. Coordinating these in sequence avoids reopening newly plastered walls. If you are having an extension built, the rewire (or first-fix extension to the rewire) should be timed to coincide with the build phase before the extension is plastered.
"A rewire is best co-ordinated with any other major building works to avoid repeat disruption. The electrical first fix should be completed, inspected, and approved before plastering begins."— NAPIT — Guidance for Homeowners on Rewiring
The Electrical Installation Certificate
On completion of a full rewire, the electrician issues an Electrical Installation Certificate (EIC) — not a Minor Works Certificate. This document records the installation details, the design specifications, and the test results for every circuit. Keep this document safely — mortgage lenders, conveyancers, and future buyers will ask for it. If a rewire was carried out without a certificate (or by an unregistered electrician who could not self-certify), a retrospective inspection by building control can be arranged, but it is disruptive and expensive.
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