Consumer Unit Replacement Cost UK: 2026 Prices Explained

Your fuse box is tripping constantly, an EICR has flagged it as unsafe, or you're simply planning ahead before problems start. Whatever brought you here, you want a straight answer on consumer unit replacement cost uk wide, not a vague "it depends" from a salesperson. Fair enough. Prices vary more than most homeowners expect, and knowing why helps you spot a reasonable quote from an inflated one.

On average, a straightforward domestic swap runs from around £350 to £800, though larger properties, dual RCD boards, or split-load setups can push that towards £1,200 or more. The final figure depends on board type, the number of circuits, how accessible your existing wiring is, and where in the country you're based, London jobs typically sit at the higher end. Labour, parts, and the Part P certification that makes the work legal all factor into the final invoice too.

Below, we break down actual price ranges by consumer unit type, explain what drives costs up or down, and cover what a compliant, certified installation should include so you're not caught out by corners cut on safety.

Why consumer unit replacement costs vary so much

Ask five electricians for a consumer unit replacement cost uk wide and you'll likely get five different figures. That's not dodgy pricing, it reflects genuine differences in the job itself. A one-bedroom flat with six circuits and easy loft access costs far less to rewire than a five-bedroom house with 15 circuits, an outbuilding supply, and a board buried under the stairs behind boxes of Christmas decorations.

Board type and specification

The unit itself is one of the biggest cost drivers. A basic dual RCD board suits most small properties and comes in cheapest, while high-integrity or split-load boards with individual RCBOs on every circuit cost more upfront but reduce nuisance tripping when one fault knocks out half the house.

The board itself is often the smallest line on your quote, labour and certification usually cost more than the parts.

Number of circuits and complexity

Every extra circuit adds testing time, cabling checks, and sometimes new cable runs if the old ones don't meet current standards. A property with underfloor heating, an EV charger, or a converted loft with its own lighting circuit takes noticeably longer than a standard three-bed semi with lights and sockets on separate rings.

Location and accessibility

Where you live affects the bill too. London labour rates typically run higher than the South East average, and properties with restricted access, think basement flats, listed buildings, or boards squeezed into tight cupboards, take longer to work on safely.

Finally, the condition of your existing wiring plays a role few homeowners anticipate. If an engineer opens up the old board and finds scorched terminals, undersized cables, or bodged additions from a previous owner's DIY attempt, that's remedial work on top of the swap itself. It's worth budgeting a contingency of 10-15% above your quote for exactly this scenario, particularly in older London properties where the original wiring predates current regulations by decades.

How to get an accurate quote for the job

Getting a reliable consumer unit replacement cost uk figure means skipping the guesswork stage entirely. A phone quote based on "it's a three-bed semi" tells an electrician almost nothing about your actual circuits, wiring age, or access. You want a proper site visit before anyone commits to a number.

Insist on an in-person assessment

Qualified engineers should look at your existing board, count the circuits, check cable condition, and confirm where the new unit will sit before quoting. This takes twenty minutes and saves you from surprise add-ons later. Skip anyone willing to price the job sight unseen, they're either guessing or padding the figure to cover themselves.

A quote given without seeing your board isn't a quote, it's a guess with a price tag attached.

Get the scope in writing

Once you've had the visit, ask for a written breakdown rather than a single lump sum. This protects both sides if anything unexpected turns up during the work.

• Unit type and RCBO count specified by brand and model

• Labour hours estimated, with hourly rate shown separately

• Certification included, confirming Part P notification and an Electrical Installation Certificate

• Remedial work clause, stating how extra faults found mid-job get priced and approved

Comparing three quotes on this basis takes the mystery out of pricing and flags anyone quoting suspiciously low by leaving out certification or using unbranded parts to hit a number.

What's included in the price and what can add to it

A fair consumer unit replacement cost uk quote covers more than just swapping a box on the wall. Knowing what should already be baked into the price helps you spot when an "extra" charge is genuinely unavoidable or just an attempt to squeeze more out of the invoice after work has started.

What a standard quote should cover

Standard jobs include removing the old unit, fitting the new board, connecting existing circuits, testing every circuit, and issuing the Electrical Installation Certificate along with Part P notification to the local authority. This is the baseline you should expect for the headline figure, not an upsell.

• Removal and safe disposal of the old consumer unit

• Supply and installation of the new board

• Testing and certification of all connected circuits

• Building control notification under Part P

• A written certificate confirming compliance

If certification isn't itemised on your quote, assume it isn't included, and ask before you book.

What commonly adds to the bill

Extras usually stem from what's discovered once the old board comes off, not from the swap itself. Damaged or undersized cables often need replacing before a new circuit can be safely connected. Bonding and earthing upgrades come up frequently in older properties where the original earthing arrangement no longer meets current standards. Additional circuits, such as adding a dedicated EV charging supply or splitting an overloaded ring, add both parts and labour. Access difficulties, like a board hidden in a tight cupboard or behind pipework, can extend the job by an hour or more, which shows up as additional labour cost on the final invoice.

Signs it's time to replace your consumer unit

Some consumer units announce their age before anything trips or fails. Others give quieter warnings that are easy to miss until an EICR inspection flags them or a genuine fault forces the issue. Knowing what to look for means you can act before a small problem becomes an electrical hazard.

Outdated fuse boxes and missing RCD protection

Wooden-backed boards, rewireable fuse wire, or a unit with no RCD protection at all are the clearest red flags. These setups predate current BS 7671 wiring regulations and won't protect you from electric shock the way a modern RCBO board does. If your board looks like something from a 1970s semi, it probably needs replacing regardless of whether it's still technically working.

A board that still works isn't the same as a board that's still safe.

Frequent tripping or physical damage

Repeated nuisance trips, scorch marks, a burning smell near the board, or switches that feel warm to the touch all point to internal faults that a swap resolves properly rather than patching over.

Planned upgrades that your current board can't support

Adding an EV charger, a home office circuit, or extra kitchen appliances often exceeds what an older board was designed to handle.

• Fuse wire or wooden-backed board

• No RCD protection fitted

• Frequent unexplained tripping

• Visible scorching or burning smell

• Planned EV charger or major appliance addition

Spotting any of these means it's worth booking an inspection sooner rather than later.

Making sense of the costs

Getting your consumer unit replacement cost uk figure right comes down to matching the quote to the actual job, not the other way round. A dual RCD board suits a small flat, a split-load or high-integrity board earns its higher price in a busy family home, and location and access nudge the final number up or down regardless of which board you choose. The cheapest quote isn't always the best one if it skips certification or glosses over remedial work that surfaces once the old board comes off.

What matters most is safety, not shaving a few pounds off the invoice. An outdated board with no RCD protection puts your household at real risk, and that's not somewhere to cut corners. If any of the warning signs above sound familiar, get a proper assessment booked rather than waiting for a fault to force the issue. Request a quote from our qualified engineers and get a clear, honest price for your property.