It will rarely tell you whether the wiring behind the plaster is safe, because most standard surveys only look at what is visible and then recommend a specialist check if anything looks wrong. Electrics are exactly the kind of defect that hides well — until a fault trips a board, or a rewire quote arrives the week after you've moved in.
There's no legal requirement for a buyer to commission an Electrical Installation Condition Report before completing a purchase. That obligation exists for privately rented homes in England, which require a valid EICR at intervals of no more than five years under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 — a duty that falls on landlords, not homeowners. If you're buying to live in, nothing in law forces the question. That doesn't mean the question isn't worth asking; it just means asking it is entirely down to you.
What an EICR actually checks
An EICR is an inspection and testing exercise carried out against BS 7671, the wiring regulations, covering the fixed installation — the consumer unit, the circuits, the earthing and bonding, the accessories. It doesn't cover appliances you'll bring with you; it covers the parts of the building's electrical system that you can't easily see or test yourself on a viewing. The report states whether the installation is satisfactory or unsatisfactory and lists coded observations, from minor recommendations up to anything classed as dangerous. Our guide to EICR certificate cost in London goes through what those codes mean and what typically drives the price of an inspection.
Why this matters more in Central London stock than elsewhere
Flats in W1, W2, NW8 and W9 are disproportionately period conversions — houses split into flats decades apart, each round of work leaving its own layer of wiring behind. It's common to find a consumer unit that's been added to three or four times by three or four different people, sometimes with no RCD protection at all, sometimes with circuits that don't match what's labelled on the board. None of that is visible on a viewing. Our guide to rewiring a period property in London and our period property refurbishment guide both cover why this stock behaves differently to a modern new-build, where the installation is recent, documented and largely untouched.
Mansion blocks add another layer: shared risers, an intake cupboard controlled by the building rather than the flat, and sometimes a supply arrangement that's genuinely unusual. None of that shows up in a solicitor's pack unless someone has specifically gone looking.
If the flat has been rented out, ask for the paperwork first
Before paying for anything new, ask your solicitor to request the seller's most recent EICR if the flat has ever been let. If it was a rental within the last five years, the landlord was legally required to hold one, and it may still be current — in which case you get the information for free. It won't necessarily still be valid on the day you complete if it's close to its five-year mark, but it's a useful starting point and often flags whether the consumer unit is old news or a recent upgrade. Sellers are also increasingly asked for an electrical certificate as part of the sale process itself; our page on the electrical certificate for selling a flat covers that from the seller's side, which is worth reading if you want to understand what a seller may already have been asked to provide.
What to do if there's nothing on file
If no EICR exists, or the one that does is old, elderly or clearly predates a run of work you can see evidence of — a newer kitchen, an obviously recent bathroom, downlights that weren't there in old estate agent photos — it's worth commissioning your own before or shortly after completion. That's a straightforward electrician call-out, from £80 excluding VAT for the visit, with the inspection itself scoped and priced against the size of the installation rather than guessed on the day. See our electrical services page for how call-outs, fault-finding and EICRs are structured.
Timing it before completion, if your solicitor and the seller allow access, means any findings can feed into negotiation rather than arriving as a surprise bill in month two. Timing it just after, if access before exchange isn't practical, at least means you know what you're dealing with early — while it's still a planned job rather than an emergency one.
What an unsatisfactory result actually means for you
An unsatisfactory EICR is not, on its own, a reason to walk away from a purchase — most older London installations will find something. What matters is what the something is. A missing bit of bonding or a couple of unlabelled circuits is a morning's work. A consumer unit with no RCD protection at all, or fuse carriers of a type that hasn't been fitted in decades, is usually a bigger conversation, and our guides to consumer unit upgrade regulations and fuse board replacement costs in London explain what that conversation tends to involve. Either way, the report should tell you which category you're in, and a competent electrician will walk you through the findings rather than just emailing a PDF.
Nobody can honestly quote remedial work before the inspection has happened, because nobody knows what it will find until it looks. The right structure is: price and carry out the inspection, then price the findings separately and itemised, so you know exactly what's required versus merely recommended before you commit to anything.
The practical takeaway
Buying in Central London already means budgeting for surveys, searches and solicitor's fees most buyers elsewhere skip. An EICR is a relatively small addition to that list, and it's one of the few checks that can save you from discovering, six months after moving in, that the board behind the airing cupboard door needs replacing and the last owner never mentioned it because they never asked either.
If you're weighing this up on a flat you're about to complete on — or you've just moved in and want to know what you're actually working with — get in touch and we'll tell you what's involved and what it's likely to cost before anyone touches a screwdriver.