Full House Rewire in London: Complete Guide to Triggers, Process and Costs
Learn when your London property needs a full rewire, what the process involves, how long it takes, and what Part P compliance means for you as a homeowner.
When Does a London Property Need a Full Rewire?
Most London homes built before 1980 contain wiring that no longer meets current safety standards. The triggers for a full rewire are not always dramatic — you do not need to see sparks or blown fuses to need one. An Electrical Installation Condition Report (EICR) is the starting point. If the report returns a C1 (danger present) or multiple C2 (potentially dangerous) codes, a rewire is almost certainly the right outcome.
Practical triggers include: rubber-insulated or aluminium wiring, a fuse board with no residual current devices (RCDs), round-pin sockets, lack of earthing on older metallic pipes, or regular tripping under normal load. Properties with single-skin wiring from the 1960s or earlier are strong candidates regardless of visible condition.
What the Process Actually Looks Like
A rewire involves first fixing a circuit plan with your electrician, then isolating the supply and stripping back existing wiring from the consumer unit outward. New twin-and-earth cabling is chased into walls or run through conduit where chasing is not viable (common in London period properties with thick masonry or lath-and-plaster walls).
First fix covers running cable and positioning back boxes. Second fix installs sockets, switches, light fittings and the new consumer unit. The finished installation is tested to BS 7671 (18th Edition) before connection is made to the supply.
London properties present specific challenges: Victorian terrace walls are often solid brick, requiring deeper chasing and more making-good plaster work. Listed buildings or properties in conservation areas may restrict surface-chasing, meaning more surface conduit. Factor in plastering and decoration costs separately — electricians make good to a surface standard, not a decorating standard.
Disruption and Timescales
A standard London terrace (three bedrooms, two floors) typically takes two to four days for the electrical work itself. However, if the property has complex lath-and-plaster ceilings that need careful access, or if there are more circuits than average, five days is realistic. You will be without power in sections of the property during work, and some circuits will be isolated overnight.
Most Londoners plan the rewire alongside a broader refurbishment so decoration disruption overlaps. Attempting to rewire a lived-in, furnished property is possible but significantly more disruptive and time-consuming.
Part P and Notifiable Work
A full rewire is notifiable work under Part P of the Building Regulations. This means either a registered competent person scheme member (such as an NICEIC or NAPIT-registered electrician) self-certifies the work, or you apply for a building regulations application through your London borough council before work starts.
Failing to comply means you cannot demonstrate legal compliance when you sell the property, and mortgage lenders increasingly require this documentation. Always request the Electrical Installation Certificate (EIC) and Building Regulations compliance certificate on completion.
Costs in London
London rewire costs are broadly higher than national averages due to labour rates and the complexity of older stock. A two-bedroom flat typically runs between £2,500 and £4,500. A three-bedroom terrace ranges from £3,500 to £6,000. Larger Victorian houses with multiple floors and additional circuits can reach £8,000 to £12,000 or more. These figures exclude plastering, decoration, or any asbestos-related work if older materials are discovered.
Always obtain three quotes and ask each contractor to break down materials from labour. Unusually low quotes often reflect missing certification or reduced-circuit scope — clarify exactly which circuits are included.