A consumer unit replacement costs most UK homes between £500 and £1,200 in 2026, with Checkatrade's national cost guide putting the average near £600. In Nottingham the three things that move your quote most are the number of circuits, whether you are fitting a dual-RCD board or a full RCBO board, and whether the earthing and main bonding need upgrading before the new unit can be certified. A consumer unit — the fuse board, the box with all the switches in it — is where every circuit in the house is protected and isolated. Replacing one is notifiable work under Part P of the Building Regulations, so it is a job for a registered electrician, and the price should have testing and certification built in rather than bolted on afterwards. How much does a consumer unit replacement cost in Nottingham? Budget £500 to £1,200 for a straightforward domestic replacement. Nottingham is not an unusually expensive place to have this work done — and it is worth knowing that the Nottingham-specific figures published by cost-comparison sites are modelled from national averages with a regional multiplier, not surveyed from real Nottingham invoices. Treat them as a sense of scale, not a price. The board itself is the cheap part. Labour, testing every circuit and the certification make up most of the bill, which is why an unusually low quote is usually missing one of them. Consumer unit replacement costs in 2026 at a glance What you are having done Typical UK range, 2026 What moves it Like-for-like dual-RCD board £500–£800 Circuit count, board make, how accessible the existing board is Full RCBO board, every circuit protected individually £800–£1,200 One device per circuit, so more parts and more terminations Surge protection (SPD) added £80–£150 on top Whether the board has the space and the right busbar arrangement Earthing conductor or main bonding found inadequate Quoted separately once seen Run length to the water and gas entry points, and whether floors have to come up Circuits that fail testing on the day Quoted separately Cannot be priced before the existing installation is tested These are national ranges from published 2026 cost guides, not a quote for your property. The only way to know what your job costs is for someone to look at the actual board, the supply and the circuits it feeds. Why do two quotes for the same job differ by hundreds of pounds? Usually because one electrician has looked at the supply side and the other has not. Before a new consumer unit goes in, Electrical Safety First's best practice guidance says the installer has to confirm that the main earthing conductor and the main protective bonding to the water and gas services are adequate, that the meter tails are rated for the load, and that the incoming polarity is correct. Where any of those fall short, the customer has to be told that upgrading is required. That check is where the money is. A board swap on a house with sound earthing and bonding is a half-day job; the same board on a 1960s property with undersized bonding is a different job at a different price. An electrician who quotes without looking has simply moved that risk onto you. What should a consumer unit replacement price include? A complete price covers the work and the paperwork that makes it legal: • The consumer unit and its protective devices, supplied and fitted. • Safe isolation, removal of the old board and installation of the new one. • Reconnecting and testing every existing circuit , not just the ones being changed. • An Electrical Installation Certificate with the schedule of test results. • Part P notification through the electrician's competent person scheme, and the Building Regulations completion certificate that follows. • Clear circuit labelling. The current standard is BS 7671:2018 with Amendment 4, published on 15 April 2026, with the previous version due to be withdrawn in October 2026. Amendment 4 brought in Regulation 411.3.4, requiring 30 mA RCD protection on lighting circuits in homes — another reason new boards are RCBO or dual-RCD rather than the older split-load arrangement. Do you actually need a new consumer unit? Not always, and this is the question the cost guides skip. Electrical Safety First is clear that whether a board needs replacing depends on its condition rather than its age, and that a consumer unit need not be replaced simply because it does not have RCD protection — there can be other ways of providing that protection. If your board is sound, correctly rated and everything tests properly, there is no rule that says it has to go. An Electrical Installation Condition Report settles it: it gives you the actual condition of the installation and codes anything that genuinely needs attention, so you spend on evidence rather than on a sales pitch. The clear-cut reasons to replace are a rewirable fuse board with fuse wire in the carriers, signs of overheating or damage, no spare ways for a circuit you need to add, or an EICR that has coded the board itself. Our guide to the signs your fuse board needs replacing covers those symptoms; this page is about what it costs once you have decided. What does a suspiciously cheap quote usually leave out? Compare quotes on what is in them, not the number at the bottom. The common omissions: • The certification. No Electrical Installation Certificate and no Part P notification. This is the expensive one — it surfaces years later when you sell and the buyer's solicitor asks for the paperwork. • Testing the existing circuits. Reconnecting without testing is quicker and cheaper, and means nobody has checked what you are now protecting. • The earthing and bonding. Assumed adequate rather than verified, then raised as an extra mid-job. • Board specification. A basic dual-RCD board quoted against someone else's full RCBO board is not the same product; on a dual-RCD board, one fault takes out half the house. • VAT. Check whether the figure includes it before comparing. How do you check an electrician is registered before booking? Check the register, not the logo on the van. For England and Wales, the Government-authorised search at electricalcompetentperson.co.uk takes a postcode or a company name and shows whether a business is genuinely registered with a competent person scheme. Scheme operators such as NAPIT also publish their own member registers, so you can confirm a registration number directly. Then ask two questions before work starts: which scheme are you registered with, and will I get an Electrical Installation Certificate and a Building Regulations completion certificate? Frequently asked questions How long does it take, and will the power be off? Most straightforward domestic replacements take four to eight hours, and the supply is off for the bulk of that while every circuit is reconnected and tested. Worth planning around freezers, home working and anyone relying on powered equipment. Properties needing earthing or bonding upgrades, or with circuits that fail testing, can run to a second visit. Is replacing a consumer unit notifiable under Part P? Yes. In England and Wales, replacing a consumer unit is notifiable work under Part P of the Building Regulations, even as a like-for-like swap. It must either be notified to building control before work starts, or carried out by an electrician registered with a competent person scheme who self-certifies it and notifies on your behalf. Does a new consumer unit have to be metal? It has to have a non-combustible enclosure, which in practice usually means steel. Regulation 421.1.201 of BS 7671 has required this in domestic premises since 1 January 2016, the aim being to contain a fire inside the enclosure. A consumer unit fitted inside a non-combustible cabinet can also satisfy it. Will an HMO or student let need a bigger consumer unit? Quite possibly. BS 7671 requires arc fault detection devices on final circuits supplying socket outlets rated up to 32 A in houses in multiple occupation, purpose-built student accommodation, care homes and higher-risk residential buildings. AFDDs are around twice the width of a circuit breaker, so a larger board is usually needed — relevant across Nottingham's rental stock. Consumer unit replacements with Somo Electrical Somo Electrical is a NAPIT-registered electrical contractor carrying out consumer unit and fuse board upgrades across Nottingham, including Beeston , West Bridgford and Arnold. We check the earthing, bonding and meter tails before quoting, so the figure you are given is the figure for the job — and we will tell you plainly if your existing board is fine as it is. For a quote, call Somo Electrical on 07733 666004 or use our online quote form . Every property is different, so we look at the installation before pricing it. Sources checked 4 August 2026: GOV.UK Approved Document P; the IET on BS 7671:2018+A4:2026 and on arc fault detection devices; Electrical Safety First guidance on RCDs and Best Practice Guide 1, Replacing a consumer unit in domestic and similar premises; and published 2026 UK cost guides from Checkatrade and BookaBuilderUK. Prices are national ranges, not a quotation.