If a consumer unit upgrade in London is on your to-do list, chances are one of three things prompted it: an EICR flagged your board, it keeps tripping, or you've just noticed it's still got a wooden back and rewireable fuses. Whatever brought you here, you want a straight answer on price and process, not a sales pitch dressed up as a guide.
Here it is: a full consumer unit upgrade in London typically costs between £450 and £850, depending on property size, the number of circuits, and the type of board fitted. A small flat with a straightforward swap sits at the lower end. A larger house needing a high-integrity board and some remedial wiring sits at the top. Everything in between depends on the specifics this guide walks through.
What most pricing guides miss is that London costs run above the national average, and that a genuine like-for-like swap is increasingly rare now that current regulations shape what your new board is allowed to be made of. That last point alone catches out more homeowners than anything else in this process, so it's worth understanding properly before you book anyone.
How Much Does a Consumer Unit Upgrade Cost in London?
For a standard domestic property with reasonable access and no major complications, expect to pay between £450 and £850, including the new unit, labour, testing, and certification.
Here's a realistic breakdown by property size:
| Property size | Typical cost (London) |
|---|---|
| 1-bed flat, 6-8 circuits | £450 to £550 |
| 2-3 bed terraced or semi, 8-10 circuits | £550 to £700 |
| 4-bed house, 10-12 circuits | £700 to £850 |
| Large house or property with extensive circuits | £850 to £1,200+ |
A word of honesty: a headline price like "starts from £299" or "from £650" tells you almost nothing useful. Two of the most-visited pages on this exact topic quote a single flat figure with no breakdown by property size or circuit count, which means you're comparing a marketing number against your actual home, not a real quote. Ask any electrician for a written price after they've seen your board, not before.
Consumer unit upgrade cost in London also runs somewhat higher than the national average you'll find on general UK cost guides, mostly down to labour rates and travel time rather than the parts themselves costing more.
New Consumer Unit Cost by Property Type
A new consumer unit cost depends on whether you're paying for supply only, or supply plus full installation, testing, and certification, and the two figures are very different.
Supply-only for a populated board with individual RCBOs typically runs £250 to £400, before labour. Full installation, including removing the old unit, fitting the new one, connecting every circuit, testing, and issuing certification, is what pushes the total to the £450 to £850 range above.
What's usually excluded from a standard quote:
- Making good the wall around the new unit (patch plastering, if the old unit was a different size or shape)
- Any rewiring the inspection reveals is genuinely needed
- Relocating the consumer unit to a different position, which is a meaningfully bigger job
Budget separately for these if your electrician flags any of them during the initial inspection, since almost no quote bundles them in as standard.
What Affects the Price of a Consumer Unit Upgrade?
Five things drive your final price: the number of circuits, the type of board specified, the condition of your existing wiring, access, and whether the unit needs relocating.
Number of circuits. More circuits mean a bigger board and more RCBOs or MCBs to fit, which is the single biggest factor in most quotes.
Type of board. A basic dual RCD board costs less than a full high-integrity board with individual circuit protection throughout. More on choosing between them below.
Condition of existing wiring. If your electrician finds faults during the initial inspection, such as damaged insulation or missing earthing, that work has to be resolved before the new board can be safely connected, and it adds to the final bill. In more extensive cases this can point toward a full rewire rather than just a board swap.
Access. A consumer unit in an easily reached hallway cupboard is quicker to work on than one buried behind boxes in a loft or squeezed into a tight understairs space, and London's parking and access constraints add their own layer on top of that, consistent with what drives up costs on almost every electrical job in the capital.
Relocation. Moving the unit to a new position, rather than a like-for-like swap, involves new cable runs and is priced closer to a small rewiring job than a straightforward upgrade.
Do You Need a Metal or Plastic Consumer Unit? (Amendment 3 Explained)
If you're replacing your consumer unit today, it will almost certainly need to be made of metal, or another non-combustible material, rather than the plastic that was standard until fairly recently.
This comes from Amendment 3 to the 18th Edition Wiring Regulations (BS 7671), which introduced a requirement that consumer units in most domestic installations be housed in non-combustible enclosures. In practice, that means metal has become the standard choice for virtually every new domestic board fitted since.
Here's why this matters more than it sounds like it should: it's the reason a plastic consumer unit that's working perfectly well can still get flagged during an EICR. The board isn't necessarily faulty. It simply no longer meets the fire-safety standard that applies to new installations, and inspectors are required to note that on the report even when everything else tests fine. This single fact explains a huge share of the "why do I need to replace something that isn't broken" confusion that shows up in almost every electrician's inbox.
There are narrow exceptions, mainly around certain surface-mounted, non-combustible situations, but for the overwhelming majority of homes, a metal enclosure is simply what gets fitted today, and it's worth knowing this before your electrician even arrives so the recommendation doesn't come as a surprise.
RCD, RCBO and Split Load: Which Type of Consumer Unit Do You Need?
For most homes, a high-integrity board with individual RCBOs on key circuits offers the best balance of safety and practicality, though a simpler dual RCD board remains a reasonable, cheaper choice for smaller properties with fewer demands on the system.
Three board types come up repeatedly, and the practical difference between them matters more than the technical description:
Dual RCD / split load consumer units. Circuits are split across two RCDs, so a fault on one side doesn't kill power to the whole house. Cheaper and simpler, but a single dodgy appliance can still take out several rooms at once if it shares an RCD with them.
High-integrity consumer units. Combines shared RCD protection for everyday circuits with individual RCBOs on the ones that matter most, such as a freezer, a home office, or medical equipment. A fault on one dedicated circuit trips only that circuit, nothing else.
Full RCBO consumer units. Every single circuit gets its own RCBO. The safest and most fault-tolerant option, and increasingly the standard specification on new installations, but the most expensive of the three.
A practical example: a family relying on a garage freezer full of food, or someone running medical equipment from home, is a strong candidate for at least a high-integrity board, since losing that one circuit to an unrelated fault elsewhere in the house is a genuinely bad outcome. A straightforward flat with modest electrical demands may not need to stretch to a full RCBO board at all.
Consumer Unit Upgrade East London: What's Different?
East London's housing mix, heavy on Victorian terraces and ex-council conversions, means a higher proportion of consumer unit upgrades here involve genuinely old wiring rather than a simple swap.
Areas like Walthamstow, Leyton, and parts of Newham have a lot of period housing stock that hasn't had significant electrical work done in decades. It's common for an initial inspection in these properties to turn up a plastic board well past Amendment 3 standards, alongside circuits that predate current regulations entirely. That combination means East London jobs more often escalate from "straightforward upgrade" into "upgrade plus some remedial work," which is worth budgeting for rather than being surprised by mid-job.
If you're searching specifically for consumer unit upgrade East London, the practical advice is the same as anywhere in the capital: get a proper inspection before assuming the price you've seen quoted online applies to your specific property, since older housing stock in this part of London genuinely does change the scope more often than newer developments elsewhere.
Signs You Need a Fuse Box Replacement
The clearest signs are rewireable fuses instead of trip switches, no RCD protection at all, frequent tripping, a wooden-backed board, and burning smells or scorch marks.
Specifically, watch for:
- Rewireable fuses, where you replace a physical fuse wire rather than flipping a switch
- No RCD protection anywhere on the board, a genuine safety gap by modern standards
- Frequent or unexplained tripping, especially across multiple appliances
- A wooden-backed board, a strong sign it predates current standards by decades
- Burning smells or visible scorch marks around the board itself
- A plastic board flagged on a recent EICR, which, as covered above, doesn't always mean it's faulty, just that it no longer meets Amendment 3
If you're seeing more than one of these, it's worth booking an inspection rather than waiting for a more serious warning sign to appear.
What's Involved in a Consumer Unit Upgrade?
A standard consumer unit upgrade takes between 4 and 8 hours for most homes, longer if remedial work or relocation is needed.
The process typically runs like this: an initial inspection to check the existing wiring and confirm the board can be safely upgraded, safe isolation and removal of the old unit, installation of the new one with every circuit connected and labelled, full testing of each circuit, and finally certification.
One detail almost nobody mentions outside of trade circles: consumer units must be positioned at least 150mm from a gas meter. This catches people out specifically during kitchen or utility cupboard renovations, where a consumer unit and gas meter can end up planned too close together without anyone realising until an electrician flags it on site. If you're renovating a space that houses both, raise this early rather than after the layout's already decided.
Power will be off for the duration of the works, so plan around that, particularly if you work from home or have anyone in the property who relies on powered medical equipment.
Is a Consumer Unit Upgrade a Legal Requirement?
There's no blanket legal requirement to upgrade a working consumer unit, but the work itself is notifiable once you do carry it out, and it must be certified by a registered electrician.
Under Part P of the Building Regulations, consumer unit replacement is notifiable electrical work. Your electrician should be registered with a Competent Person Scheme such as NICEIC, NAPIT, or ELECSA, allowing them to self-certify the work rather than needing separate council sign-off.
After completion, you should receive an Electrical Installation Certificate (EIC), confirming the new work meets current standards. This is a different document from an EICR, which is an inspection of existing wiring rather than a certificate for new work, a distinction that trips people up constantly across this entire topic area.
In practice, the most common real-world trigger for this job isn't a homeowner deciding out of nowhere to upgrade. It's a failed or unsatisfactory EICR, often carried out for a landlord's rental compliance, recommending the board as remedial work. If that's what's brought you here, it's worth reading our guide on landlord electrical safety certificates to understand exactly how that process and its deadlines work.
Consumer Unit Upgrades for Flats and Leasehold Properties
If you own a leasehold flat, check whether your consumer unit is individually metered before booking any work, since some older conversions share distribution infrastructure across multiple flats.
This is a smaller consideration than it is for a full rewire, since a consumer unit swap is a contained job rather than one that touches shared building fabric extensively. Still, where the upgrade is part of a wider renovation, it's worth a quick check of your lease for any notification requirements to your freeholder or management company, particularly if access to a shared riser or cupboard is involved. A five-minute check now avoids an awkward conversation with your freeholder later.
Frequently Asked Questions
How much does a consumer unit upgrade cost in London?
Most homes pay between £450 and £850, depending on property size, circuit count, and board type. Larger properties or ones needing remedial work can run higher.
Do I need to upgrade my consumer unit if it still works?
Not automatically, but if it's a plastic board, it's likely to be flagged on your next EICR under Amendment 3 fire-safety standards, even if it's functioning perfectly well electrically.
How long does a consumer unit upgrade take?
Typically 4 to 8 hours for a standard property. Add extra time if remedial wiring work or relocation is needed.
Does a consumer unit upgrade require rewiring?
Not usually, but your existing wiring must pass inspection before the new unit is connected. If faults are found, that work needs resolving first, which adds time and cost.
What's the difference between an EICR and a consumer unit upgrade?
An EICR is an inspection report on your existing wiring. A consumer unit upgrade is the actual replacement work, which, once completed, gets its own certificate (an EIC), separate from any EICR.
Can I fit a consumer unit myself?
No. This is notifiable electrical work under Part P, and it must be carried out and certified by a registered, competent electrician.
Do I need a metal consumer unit in my home?
For almost all domestic installations today, yes. Amendment 3 requires non-combustible enclosures for new consumer units, and metal is the standard choice electricians now fit.
Every property's wiring history is different, and the only way to get a genuinely accurate price for yours, whether it's a straightforward flat or a period house with decades-old circuits, is a proper inspection rather than a number pulled from a table. Get in touch for a written, itemised quote, and we'll walk you through exactly what your upgrade would involve.
