How Much Does It Cost to Rewire a House in London?
A full house rewire is one of the most important — and most disruptive — improvements in an older London property. Most Victorian, Edwardian, and inter-war houses still have electrical wiring that is decades old, and while older wiring isn't automatically dangerous, it frequently fails to meet modern safety standards, lacks the capacity for the electrical loads of modern households, and may have insulation that has degraded over time. Here's what a rewire involves, what it costs in London, and when you should be considering one.
What a Rewire Involves
A full rewire involves: replacing the consumer unit (fuse board) with a modern unit incorporating residual current devices (RCDs) and circuit breakers; stripping out all existing wiring back to the consumer unit; running new cable from the consumer unit to every socket outlet, light fitting, switch, and fixed appliance throughout the property; installing new back boxes at every socket and switch position; and testing and certifying the installation to BS 7671 (the IET Wiring Regulations).
A rewire is highly disruptive: to run new cable through the walls and ceilings, first-fix chasing (cutting channels in the plaster) is required. All plastered surfaces that are chased will need to be made good (filled and replastered). In practice, a rewire is best carried out when a property is either vacant or is being refurbished — the replastering that follows the rewire can be part of the wider refurbishment plastering package rather than a separate cost.
Signs That a Rewire May Be Needed
Rubber or fabric-sheathed cables (rather than PVC — visible at the consumer unit or in the loft). Old ceramic fuses rather than modern circuit breakers. Fewer than two ring circuits for sockets (a single ring circuit for the whole house is inadequate for modern demand). No RCD protection (indicated by older-style consumer units without the characteristic double-width RCD device). Persistent tripping, flickering lights, or scorch marks around sockets or switches. An EICR (Electrical Installation Condition Report) that has identified the installation as C1 (danger present) or C2 (potentially dangerous) will confirm whether a rewire is required.
Cost Ranges for London
One-bedroom flat: £3,500–£6,000.
Three-bedroom terraced house: £6,000–£10,000.
Four-bedroom Victorian terrace: £8,000–£15,000.
Larger house or complex layout: £12,000–£25,000+.
These ranges are for the electrical works only and do not include the making-good (plastering and decoration) that follows the first-fix work. Where a rewire is part of a wider refurbishment, the making-good cost is typically absorbed into the broader refurbishment package.
Certificate of Completion
Any notifiable electrical work — including a rewire — must be certified by a registered Part P electrician. The electrician provides an Electrical Installation Certificate (EIC) on completion, which should be retained and made available to future buyers as evidence of the installation's condition. Do not accept any electrician who is unwilling to provide this documentation.
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