Expert electrical advice from our NICEIC registered team
Written by Tim, NICEIC registered with 18+ years experience in Poole & Dorset · 5-star Google reviews · Same-day fixed quote, no obligation.
Consumer unit replacement cost in 2026: from £450 for a 6-way RCBO board, £550 for a typical 10-way board, £750 for a 14-way board, plus £95 for surge protection. Fixed NICEIC quote in 24 hours, 4–6 hours on site, Part P certificate posted within a week. Tim’s fitted hundreds across Poole, Bournemouth, Christchurch, Wimborne, and Wareham. Below is the detail on what drives the price, when you actually need an upgrade, and what to expect on the day.
Where Lilliput Electrical works: Dorset only, postcodes BH (Bournemouth, Poole, Christchurch, Wimborne, Wareham, Ferndown) and DT (Dorchester, Weymouth, Bridport). For local pricing and postcode coverage, the consumer unit page has dedicated sections for Poole (BH12–BH17) and Bournemouth (BH1–BH11); for everywhere else see the area pages for Wareham, Wimborne and Christchurch. Outside Dorset? This guide is still useful for understanding the cost drivers, but you’ll need a local NICEIC engineer for the work.
TL;DR: Consumer Unit Upgrade at a Glance
- Typical cost: from £550 for a 10-way board in a 2 to 3 bed home
- What’s included: Consumer unit, MCBs, RCDs, labour, testing, certificate
- Time: Typically 1 day (power off for 4–6 hours)
- Must be done by: A registered electrician (Part P of Building Regulations)
- How often: Every 25–30 years, or when flagged on an EICR
Prices are fully fitted and include the metal RCBO board, all protective devices, labour, the full test schedule and the NICEIC certificate:
| Board | Typical property | Price fitted |
|---|---|---|
| 6-way RCBO board | Small flat, 1-bed | From £450 |
| 10-way RCBO board | Typical 2 to 3 bed home | From £550 |
| 14-way RCBO board | 4 to 5 bed or extended home | From £750 |
| Surge protection device (SPD) | Any board | + £95 |
| Arc fault detection (AFDD), per circuit | Where required | + £65 |
| Three-phase commercial board | Shops, offices, workshops | From £1,200 |
Earthing or bonding upgrades found on the day are quoted separately.
Want a price for your property? Message Tim on WhatsApp with your postcode and he’ll give you a fixed price, usually within the hour. No obligation.
We recently completed a consumer unit upgrade for a 4-bedroom property in Sandbanks, replacing an outdated wire fuse box with a modern Hager dual-RCD board with surge protection. The old unit had no RCD protection and was regularly tripping. The entire job was completed and certified in a single day.
Board size is set by circuit count, and circuit count follows house size. A flat with 4 to 6 circuits takes a 6-way RCBO board, from £450. A semi or terraced house with 6 to 12 circuits takes a 10-way board, from £550, which covers most 2 to 3 bed homes. A 4 to 5 bed detached house, or a smaller home that has been extended, usually needs a 14-way board to fit every circuit, from £750. The price step between the three sizes reflects the extra RCBOs, the larger enclosure and the longer test schedule, not a different quality of work. Every board fitted is metal-enclosed with an RCBO on each circuit as standard. If your property sits between two sizes, we confirm the exact circuit count on site before quoting, so the fixed price you’re given is the price you pay.
Fuse box, fuse board and consumer unit are three names for the same thing. “Fuse box” is the older term from when circuits were protected by rewirable wire-and-ceramic fuses rather than RCBOs. Replacing a rewirable fuse box with a modern RCBO consumer unit is priced by board size in the same way as any other upgrade, from £450 for a small flat up to £750 for a larger home. The usual triggers for swapping a fuse box are a plastic enclosure (modern units must be metal) and no RCD protection at all, since old fuse boards give no shock protection whatsoever. Once the fuse box is replaced with an RCBO board, every circuit is individually protected, and a single fault only trips that one circuit rather than the whole board.
An RCBO board fits a combined RCD and MCB into a single module for every circuit, so one fault only trips that circuit. A dual-RCD board instead splits the whole property across two RCDs, so a fault on one circuit can trip everything sharing that RCD, including circuits with no fault at all. All three boards priced above, the 6-way, 10-way and 14-way, are RCBO boards, from £450, £550 and £750. Surge protection (SPD) adds £95 on any of them, protecting the electronics on the installation against voltage spikes from lightning or grid switching. For a straightforward domestic upgrade, an RCBO board at these prices gives better fault isolation than a dual-RCD board for a modest difference in cost.
We upgrade consumer units across Poole, Bournemouth, Wimborne, and the surrounding Dorset area. Many of the properties we work on (particularly 1960s and 70s estates in Broadstone and Ferndown, and older period homes in Christchurch) still have their original fuse boxes with no RCD protection at all.
A consumer unit upgrade typically takes a full day and involves:
Not every consumer unit upgrade is the same price, and the final cost depends on a few key factors.
Number of circuits is the biggest variable. A small flat with 5 circuits is a much quicker job than a 4-bed detached with 14. More circuits means more MCBs, more testing, and more time.
Earthing and bonding condition matters too. If your existing main earth or bonding connections are undersized, corroded, or non-compliant, we’ll need to upgrade those at the same time. This is common in properties built before the mid-1970s and can add £80–£150 to the job.
Surge protection (SPD) is now a standard expectation on new installations. Adding an SPD module costs £95, and it’s money well spent (more on that below).
Access plays a role as well. If your meter cupboard is cramped, buried behind built-in furniture, or in an awkward location, it takes longer to work safely. We occasionally need to relocate a consumer unit entirely, which is a separate piece of work.
Earthing system upgrades matter too. Some older properties, particularly rural ones, run on a TT earthing system with an earth rod in the ground. If your supply has since been upgraded to TN-C-S (PME) by your DNO but the consumer unit hasn’t been updated to match, there’s additional bonding and earthing work involved.
The 18th Edition of BS 7671 (in force since 2019) introduced the surge protection assessment, and Amendment 2 in 2022 removed the old opt-out that let single dwellings skip it. In practice, this means any new consumer unit installation should include an SPD unless a formal risk assessment says otherwise.
An SPD protects your electrical system against transient overvoltages, the sudden spikes caused by nearby lightning strikes, grid switching, or faults on the supply network. These surges can damage sensitive electronics like computers, smart home devices, EV chargers, and solar inverters. Given that a typical home now has thousands of pounds’ worth of electronics plugged in, the £95 cost of adding an SPD is trivial by comparison.
Strictly speaking, a like-for-like consumer unit replacement doesn’t always trigger the SPD requirement. But we fit them as standard on almost every upgrade we do. The cost is minimal, the protection is genuine, and it future-proofs the installation. If you’re already paying for a new board, it makes no sense to leave surge protection off.
When we quote for a consumer unit upgrade, customers often ask about the difference between a dual-RCD board and an RCBO board. Both are compliant, but they work differently.
A dual-RCD board splits your circuits into two groups, each protected by its own RCD. It’s the more common and more affordable option. The downside is that if one circuit develops a fault, the RCD trips and takes out every circuit on that side of the board. In a worst case, you lose your lights, sockets, and kitchen circuits all at once because of a single dodgy appliance.
An RCBO board gives every circuit its own combined MCB and RCD protection. If one circuit trips, everything else stays on. No nuisance tripping, no sitting in the dark because your outdoor light has a moisture issue. It’s a better system.
An RCBO board costs a little more than a dual-RCD board, depending on the number of circuits. All the boards we fit as standard, at the prices above, are RCBO.
Written by Tim, NICEIC registered with 18+ years experience in Poole & Dorset · 5-star Google reviews · Same-day fixed quote, no obligation.
We carry out consumer unit upgrades right across Dorset. Here’s what we typically see in each area.
In Wimborne, we frequently upgrade consumer units in 1960s and 70s properties along the Leigh Road and Merley estates. These homes were built with rewirable fuse boards that have been in service for over 50 years. If you’re searching for a fuse board change in Wimborne, chances are your property falls into this category. We’ve done dozens of them.
Christchurch properties, especially in the Highcliffe and Mudeford areas, tend to be a mix of 1930s bungalows and post-war semis. Many still have original or early plastic consumer units with no RCD protection. The bungalows in particular often have limited circuit counts, which keeps the upgrade cost at the lower end.
Poole and Broadstone have many ex-council properties from the 1970s and 80s that were built with basic split-load boards. These are due for replacement. They don’t meet current regulations and the MCBs are often obsolete types that are no longer manufactured.
Bournemouth BH1–BH11 covers a huge range of property types. Terraced houses and HMOs in Boscombe and Springbourne often need consumer unit upgrades as part of landlord compliance work, and an EICR frequently flags the board as a C2. Victorian and Edwardian conversions in Westbourne and Charminster sometimes need dual boards to handle the circuit count across multiple floors.
Wareham and Ferndown include some rural properties on TT earthing systems. These jobs sometimes involve upgrading the earthing arrangement alongside the consumer unit, which adds to the scope. We always check the earthing system before quoting so there are no surprises on the day.
Sandbanks and Canford Cliffs properties are typically high-specification homes with extensive electrical installations, with 15 to 25+ circuits, home automation, underfloor heating zones, and dedicated EV charger supplies. These properties almost always warrant an RCBO board, and we often install Hager units with integrated surge protection and metering capabilities.
A consumer unit upgrade is the most cost-effective safety improvement for older properties, but it only addresses the fuse box itself. If your wiring is also in poor condition (rubber-insulated cables, burning smells, frequent tripping), a full rewire may be necessary. An EICR (Electrical Installation Condition Report) from £120 is the best way to assess whether your wiring needs attention beyond the consumer unit.
A consumer unit upgrade typically takes one full day, usually between 6 and 8 hours from start to finish. That includes removing the old board, installing and wiring the new one, testing every circuit, and completing the paperwork. For large properties with 16+ circuits or where additional earthing work is needed, it can occasionally run into a second morning.
No, you don’t need to leave, but your electricity will be off for roughly 4–6 hours during the main part of the work. We always let you know before we isolate the supply so you can charge phones, fill the kettle, and plan around it. The power comes back on circuit by circuit as we test, so you’ll usually have some circuits back before the end of the day.
Yes, absolutely. A consumer unit upgrade is a standalone job and one of the most common pieces of work we do. It brings your electrical protection up to current standards without the disruption and cost of a full rewire. That said, if your wiring is in poor condition, we’ll flag it during the work. We won’t just bolt a new board onto dodgy cables.
No, not legally, unless you’re prepared to pay Building Control to inspect and certify the work directly, and even then it’s dangerous DIY territory. The incoming supply can’t be isolated without pulling the main fuse, and every circuit must be tested on energisation. Consumer unit replacement is notifiable under Part P precisely because getting it wrong is a fire and shock risk. A registered electrician self-certifies the whole job, and the certificate is what your insurer and any future buyer’s solicitor will ask for.
Generally no. Home insurance covers damage from insured events (fire, flood, storm), not the cost of upgrading outdated equipment. However, some policies do include home emergency cover that might contribute towards electrical repairs. It’s worth checking your policy, but most homeowners treat a consumer unit upgrade as planned maintenance rather than an insurance claim.
They’re essentially the same thing: the box where your electricity supply is distributed to individual circuits around your home. “Fuse box” is the older term from when circuits were protected by rewirable fuses. Modern units use MCBs (miniature circuit breakers) and RCDs instead of fuses, so the industry calls them consumer units. If someone tells you they need to “upgrade your fuse box,” they mean replacing it with a modern consumer unit.
Yes, replacing a consumer unit is notifiable work under Part P of the Building Regulations (England and Wales). This means it must be carried out by a registered electrician who can self-certify the work through their competent person scheme. We’re registered with NICEIC, so when we complete your upgrade, we notify Building Control on your behalf and you receive an Electrical Installation Certificate. You don’t need to arrange any inspections or approvals yourself.
There’s no fixed expiry date, but consumer units typically have a service life of 25–30 years. In practice, the trigger for replacement is usually an EICR that flags the board as unsatisfactory, either because it lacks RCD protection, the enclosure is plastic (non-fire-rated), or the components are obsolete. If your property was built or last rewired in the 1990s or earlier and still has the original board, it’s almost certainly due for an upgrade.
We use Hager and Wylex consumer units. Both are established, quality manufacturers with a strong track record in the UK market. Hager is our go-to for most installations. Their boards are well-built, easy to work with, and have excellent component availability. For larger properties or where we need specific configurations, we sometimes use Wylex. We don’t use budget brands. The consumer unit is the single most important safety device in your home, and it’s not the place to cut corners.
A new consumer unit in 2026 costs from £450 for a 6-way RCBO board, £550 for a 10-way board and £750 for a 14-way board, fully fitted. That includes the board, labour, testing and the Part P certificate. Add £95 for surge protection. The exact figure depends on circuit count and on whether any remedial work is found when the cover comes off.
Across the UK a consumer unit replacement runs from about £450 to £1,200 fitted, set mainly by board size and by the condition of the existing wiring. If circuits fail their tests on energisation, those faults must be made safe before the certificate can be issued. We give a fixed quote in 24 hours with no call-out fee, so there are no surprises on the day.
Installation cost is included in the prices above, so there’s no separate fitting charge. A standard replacement takes 4–6 hours with the power off and is carried out by a NICEIC-registered engineer who self-certifies the work under Part P. You receive the Electrical Installation Certificate and Part P notification on completion.
Consumer unit: the board where your incoming electricity supply splits into the individual circuits around your home. Modern industry name; older homes call it the “fuse box.”
MCB (Miniature Circuit Breaker): a switch that automatically trips when a circuit draws more current than it’s rated for (e.g. short circuit, overload). Replaces the rewirable fuses found in pre-1980 boards.
RCD (Residual Current Device): a switch that trips when it detects current leaking to earth, protecting against electric shock. Older boards have one RCD covering many circuits, a nuisance because any fault trips the whole group.
RCBO (Residual Current Breaker with Overload): combines MCB + RCD in a single module per circuit. A fault on one circuit only trips that circuit. Recommended spec on modern boards.
SPD (Surge Protection Device): protects sensitive electronics (TVs, computers, EV chargers, solar inverters) from voltage spikes caused by nearby lightning or grid switching. Required by BS 7671 in some installations, optional in others.
AFDD (Arc Fault Detection Device): detects arc-faults in damaged or loose cabling that conventional RCDs miss. A common cause of house fires. Required for HMOs and high-risk residential under BS 7671 amendments; nice-to-have on standard family homes.
Part P: the section of the UK Building Regulations covering domestic electrical safety. Consumer unit work is notifiable: either a registered electrician self-certifies, or the homeowner pays Building Control directly.
BS 7671 / 18th Edition: the UK wiring regulations. Latest 18th Edition (with amendments) sets the metal-enclosure rule for new consumer units, SPD and AFDD requirements, and RCD-protection scope.
Like-for-like swap: replacing the consumer unit without changing any circuits or wiring. Cheaper (£450 typical) and faster, but doesn’t address underlying wiring issues. Use when the existing wiring is in good condition.
Notifiable work: work that legally requires Part P notification to Building Control before the certificate is valid for insurance and house sale.
Ready to upgrade? Message Tim on WhatsApp or call 07809 680068 for a free, no-obligation quote. We cover Poole, Bournemouth, Wimborne, and all surrounding areas. We’ll arrange a free visit to assess your installation.
Tim and his team are happy to answer questions or provide a free, no-obligation quote. 5-star Google reviews and counting.
Tim and his NICEIC-registered team are here to help. Message us on WhatsApp or call 07809 680068 for a free, no-obligation quote.
