Last updated 7 October 2026
Short answer: in North East Scotland a standard domestic fuse box upgrade costs from £550 + VAT, with bigger or more complex boards guided up to about £950 + VAT. The type of board you choose changes the price far less than people expect. Circuit count, the state of your earthing and meter tails, and what testing finds on the day decide most of the final figure.
This guide breaks the cost down by board type: the old rewireable fuse box, the split load board with one or two RCDs, the all RCBO board, boards with surge protection, boards that also feed a car charger, and three phase boards. For each one we say what it is, whether it still meets the rules, and what it costs to replace or add to. All prices are our own published guide prices, quoted excluding VAT.
Fuse box upgrade cost by board type
| What you have now, or want | Is it still acceptable? | Typical cost |
|---|---|---|
| Old fuse box with rewireable or cartridge fuses and no RCD | No RCD protection at all, which is the clearest reason to replace a board | New consumer unit from £550 + VAT, guide up to £950 + VAT |
| Split load board, breakers in two groups behind one or two RCDs | Generally compliant. The case for changing it is convenience, not law | An inspection first: EICR from £150 + VAT. Replacement, if you want it, from £550 + VAT |
| All RCBO board, a combined breaker and RCD on every circuit | Current good practice. Not a legal requirement | Extra RCBO on an existing board £25 to £30 + VAT per device, plus fitting |
| Surge protection device (SPD) added to a board | Assessed at survey. In a single home the owner can decline one, and that choice is recorded | £40 to £80 + VAT per device |
| New board plus a circuit for an EV charger | Depends on spare capacity and the main fuse rating | £750 to £1,000 + VAT for the board and the charger circuit together |
| Three phase board | Mostly larger homes, farms and business premises | Priced after a survey, because the board and supply vary too much for a guide figure |
Any other work found along the way, such as a fault on a circuit, is charged at £55 to £75 per hour + VAT, and only after you have seen what testing showed.
What each board type means in practice
The old fuse box
A fuse box with fuse wire or cartridge fuses and no RCD gives no protection against an electric shock from an earth fault. That is the board most people mean when they ask about a “fuse box upgrade”, and it is the one where replacement is clearly worth the money. A replacement usually takes one working day, with the power off for roughly 4 to 6 hours of it.
The split load board
A split load board puts the circuits in two groups, each behind an RCD. Where the RCDs cover the sockets, this board generally complies with the current standard. Its weakness is consequence: one fault switches off every circuit on that side, so a tripped kettle can also take out the freezer and the router. Changing it for an RCBO board is a reasonable choice, but nobody should tell you it is compulsory.
The all RCBO board
An RCBO combines a circuit breaker and an RCD in one device, so a fault switches off one circuit and nothing else. It is the layout most new boards use today. No regulation requires every circuit to have its own RCBO in an ordinary home, so treat it as a quality choice. If your board already has RCBOs and spare ways, adding one more costs £25 to £30 + VAT per device plus fitting rather than a new board.
Surge protection
A surge protection device limits short voltage spikes from lightning or switching on the network. The old risk assessment calculation for surge protection was removed from BS 7671 in 2022. For a single dwelling the owner may decline an SPD, and that decision is written on the certificate. Each device is £40 to £80 + VAT.
A board that also feeds a car charger
If you plan a home charger, it is cheaper to plan the board and the charger circuit together than to do them a year apart. Our guide price for the two together is £750 to £1,000 + VAT. Whether it works on your supply depends on the main fuse, which we check first. You can read more on our EV charger installation in Aberdeen page.
Three phase boards
Three phase supplies are less common in houses and the boards, isolators and cable sizes vary widely, so we price them after a survey rather than quote a figure that might not hold.
What about metal consumer units?
Regulation 421.1.201 of BS 7671 requires a non combustible enclosure, in practice a metal one, for a consumer unit installed in a home. Every new domestic board we fit meets it, so it is not an extra on your quote. It applies to what is fitted now. It does not make an existing plastic board a fault, and it is not on its own a reason to replace one.
What is included in a consumer unit price
- The new consumer unit and a protective device for every circuit
- Testing the existing circuits before the old board comes off, so any fault is known before the power goes off
- Removal and disposal of the old fuse box
- Every circuit labelled at the board
- Full testing after installation, with the readings recorded
- An Electrical Installation Certificate to BS 7671:2018+A4:2026
Five things that move the final price
- Circuit count. A one bed flat and a four bed house with a shower, a hob and a garage need different boards.
- Earthing and main bonding. Missing or undersized bonding to the water and gas pipes is the most common extra in older property.
- Meter tails. Short, undersized or brittle tails between the meter and the board are replaced.
- Where the board sits. A shared close, an external meter box or a board a long way from the meter adds time.
- What testing finds. A circuit that fails its test is priced separately and is never quietly switched back on.
One limit is worth knowing before you budget. A new board protects circuits, it does not repair them. Fitted over cable with tired insulation, a modern RCD will trip on leakage the old fuse box never noticed. When testing shows that, the honest answer is sometimes a rewire in Aberdeen rather than a new board.
Do you need a new board at all?
There are four good reasons to replace a consumer unit:
- There is no RCD protection anywhere on the board.
- There is scorching, a burning smell, buzzing or a warm casing. Switch off at the main switch and call an electrician that day.
- An EICR recorded a C1 or C2 at the board itself.
- You are adding a car charger, an electric shower or a heat pump and the board has no spare way or cannot protect the new circuit properly.
If none of those applies, an inspection may be all you need. An EICR in Aberdeen starts from £150 + VAT for the board and the first five circuits, and it tells you whether the board you have is fine.
The rules in Scotland
The current wiring standard is BS 7671:2018+A4:2026, published on 15 April 2026. It is still the 18th Edition. Two points that national guides often get wrong for Scottish readers:
- Part P and Building Control notification belong to England and Wales. They do not apply here.
- A like for like board change in a house of up to two storeys does not need a building warrant. In flats, maisonettes and buildings of three storeys or more, wider work such as a rewire or new circuits can need one from the council, and that duty sits with the owner.
On arc fault detection devices: they are required on socket circuits up to 32 A in high rise residential buildings, HMOs, purpose built student accommodation and care homes. In an ordinary house they are recommended, not required, so they are an option on your quote rather than a must.
Grants and the main fuse
When we checked in October 2026, the funding listed by Home Energy Scotland covered energy saving work such as insulation and heat pumps, not electrical safety upgrades like a new consumer unit. If someone offers you a free board through a grant, ask which scheme is paying and check it is listed by Home Energy Scotland or on gov.scot.
The main fuse in the sealed cut out, where the supply cable enters the house, belongs to SSEN, the network operator in the north of Scotland. Only they can change it. A new consumer unit does not increase what your supply can deliver, which matters if you are adding a car charger or a heat pump.
Frequently asked questions
How much does it cost to upgrade from fuses to breakers?
Replacing an old fuse box with a modern consumer unit costs from £550 + VAT for a typical home, guided up to about £950 + VAT for larger or more complex boards. The price includes testing, removal of the old fuse box and an Electrical Installation Certificate.
Is it worth replacing a split load board with an RCBO board?
Only if the convenience is worth it to you. A split load board whose RCDs cover the sockets generally complies. An RCBO board means one fault switches off one circuit instead of half the house, which many people value, but it is a choice, not a legal requirement.
Can I replace my consumer unit myself?
No, not safely. Isolating the supply usually means withdrawing the sealed main fuse, which belongs to the network operator and must not be tampered with. In Scotland the owner has a duty under the Building (Scotland) Act 2003 to make sure electrical work meets the building regulations, and a new board has to be tested with calibrated instruments and recorded on an Electrical Installation Certificate.
How long does a consumer unit replacement take?
Most domestic replacements are finished in one working day, with the power off for roughly 4 to 6 hours of it. Bonding or meter tail work adds time.
Can I get a free fuse box replacement?
Not from the funding Home Energy Scotland listed when we checked in October 2026, which covered energy saving measures rather than electrical safety work. Treat an offer of a free board with caution and check which scheme is paying before anyone starts work.
Get a fixed price for your board
If you are in the city, our consumer unit service in Aberdeen sets out what we fit and how a replacement day runs. Further out, see our fuse box upgrades across Aberdeenshire. Send a photo of your board with the cover closed and one with it open, and we will tell you whether it needs replacing at all. Call 07304 027013 or get in touch through our contact page.
