Consumer Unit Replacement Cost in North Wales: What Affects the Price

In short: the cost of a consumer unit (fuse box) replacement depends mostly on the size of your installation and what testing finds. We give you a fixed price after a quick look at your installation, covering the new unit, fitting, full testing, the electrical installation certificate and Building Regulations notification. We’re not VAT registered, so there’s no VAT to add.

This guide is written by Scott Griffith, an NICEIC Domestic Installer based in Colwyn Bay, to explain what you’re paying for and what can change the price.

What’s included in our price

• A new consumer unit with RCD protection on every circuit
• Removing and disposing of the old fuse box
• Testing every circuit before and after the change
• An Electrical Installation Certificate
• Notification to building control through NICEIC, as required under Part P of the Building Regulations

What can add to the cost

Most jobs come in at the price we quote. These are the things that can add to it, and we’ll always tell you before doing any extra work:

• Faults found during testing. A modern RCD board won’t hold if a circuit has an earth fault, poor insulation or a borrowed neutral. These have to be found and fixed first.
• Missing main bonding. If there’s no main protective bonding to the gas and water pipes, it needs adding.
• Moving the board. Relocating the consumer unit, for example out of a cupboard under the stairs, means extra cable and labour.
• Meter tails or main earth upgrades if the existing ones are undersized or damaged.
• Larger installations with a lot of circuits, or more than one board.

Signs you need a new consumer unit

• You still have an old fuse box with rewireable fuses
• There’s no RCD protection, or only some circuits are covered
• Your EICR has coded the board C2 (potentially dangerous)
• Breakers trip often or the board shows signs of heat damage
• You’re adding an EV charger, solar panels or a new circuit and there’s no spare space

How long does it take?

Usually half a day to a full day. The power will be off for most of that time while the old board comes out, the new one goes in and every circuit is tested.

Scott brings a portable power bank that can keep your Wi-Fi router running and charge a laptop or phone, so you can keep working from home and the kids can stay entertained while the board is changed.

Why the cheapest quote isn’t always cheapest

A proper consumer unit change includes testing the whole installation, not just swapping the box. If faults aren’t found first, the new RCDs can trip constantly, and you’ll be paying someone to come back. Always check your electrician is registered with a scheme such as NICEIC or NAPIT, and that you’ll get a certificate and building control notification at the end.

Consumer unit replacement FAQs

How much does a consumer unit replacement cost in North Wales?

It depends on the size of the installation and what testing finds. We give a fixed price after a quick look, including testing, certification and Building Regulations notification.

Do I need a certificate for a new consumer unit?

Yes. Replacing a consumer unit is notifiable work under Part P of the Building Regulations. You should get an Electrical Installation Certificate and a Building Regulations compliance certificate.

Should I get an EICR first?

It isn’t always necessary, but if the wiring is old or hasn’t been tested for a while, an EICR can show up faults before the board is changed, so there are no surprises on the day.

Which areas do you cover?

Colwyn Bay, Llandudno, Conwy, Rhyl and Abergele, Prestatyn and the rest of the North Wales coast. See all the areas we cover.