Fuse Box Installation: Upgrading Your Consumer Unit Explained

The fuse box – more properly called the consumer unit – is the heart of your home electrical system. If yours has an old fuse board with a rewirable fuse, it may not meet modern safety standards. This guide explains fuse box installation, when an upgrade is needed and what to expect.

For the official guidance, see Electrical Safety First guidance.

What is a consumer unit or fuse box?

The consumer unit is the control panel where electricity enters your home and is distributed to the circuits. It contains the main switch, circuit breakers and RCDs that protect you from electric shock and protect your wiring from overloads and faults.

When do I need a new fuse box?

You should consider upgrading if you have an old rewirable fuse board, a fuse box with no RCD protection, signs of burning or rust, or if you are adding a major new circuit such as an EV charger or a new kitchen. A new consumer unit is the safest way to bring an ageing electrical system up to date.

Old rewirable fuse box with fuses that blow
No RCD protection on the circuits
Discoloured, burnt or hot fuse box
Regular tripping or nuisance issues
Home improvements that add heavy electrical loads

An electrical survey of the existing wiring can identify whether your consumer unit meets the current requirements of the wiring regulations before you spend on a full replacement.

What is an RCD and why does it matter?

An RCD, or residual current device, cuts off the electricity in milliseconds if it detects current leaking to earth. It prevents serious electric shocks and reduces the risk of electrical fires. Modern consumer units split circuits across multiple RCDs so a fault in one area does not plunge the whole home into darkness.

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How much does a fuse box installation cost?

What does a consumer unit upgrade involve?

The cost depends on the size of the property, the number of circuits and whether any repairs to existing wiring are needed. A straightforward consumer unit upgrade is priced clearly, and you will know the full cost before work starts. See our fuse box installation service for the price.

Do I need building regulations approval?

A qualified electrician isolates the supply, removes the old unit, fits a modern consumer unit with circuit breakers and RCDs, and tests every circuit. The work is carried out to the current edition of the wiring regulations and completed with a certificate.

Is a new fuse box required to sell a house?

Most consumer unit replacements fall within the scope of the building regulations. In practice, using a registered electrician who can self-certify the work meets this requirement, and you receive a certificate for your records, which matters for insurance and for selling the home.

Fuse box upgrades and your EICR

There is no outright legal requirement, but a modern consumer unit with RCD protection is what surveyors and buyers increasingly expect. If your fuse box is outdated or shows problems, it can cause a homebuyers report to flag the electrical installation and slow down your sale.

Why choose Smart Property Checks?

Smart Property Checks uses qualified electricians who fit modern consumer units to current standards and test everything before they leave. You get a certificate and peace of mind. Contact our team to arrange your fuse box upgrade.

The booking process

Select the fuse box installation service for your property
Choose a convenient appointment slot
A qualified electrician installs and tests the new consumer unit
You receive your certificate and a full explanation of the work

Book your fuse box installation today with Smart Property Checks and upgrade your home safely.

Common Questions

What is a fuse box?

A fuse box, or consumer unit, is the control panel that distributes electricity around your home and contains the breakers and RCDs that protect your circuits.

How do I know if my fuse box needs replacing?

Signs include an old rewirable fuse board, no RCD protection, burning smells, tripping, or recent additions like an EV charger that the current unit cannot support.

How much does a new fuse box cost?

The cost depends on the property size and number of circuits. You are given the full price before work begins through our fuse box installation service.

How long does a fuse box upgrade take?

A typical consumer unit upgrade takes a few hours. The electrician isolates the supply, fits the new unit and tests every circuit before leaving.

Do I need an EICR before a fuse box upgrade?

Not always, but an EICR can confirm the wiring is in good condition before you invest in a new consumer unit, and it may be the reason the upgrade is needed.

Can a fuse box be installed by anyone?

Consumer unit work must be done by a qualified electrician, and where building regulations apply it should be carried out by someone who can self-certify.

What is the difference between fuses and circuit breakers?

A fuse is a one-use wire that melts and must be replaced, while a circuit breaker is a switch that trips and can simply be reset after the fault is fixed.

Is RCD protection required in modern homes?

Modern wiring regulations require RCD protection for most circuits, which is why upgrading an old fuse box without RCDs dramatically improves safety.

Will a new consumer unit stop my circuits tripping?

A modern unit with separate RCDs reduces nuisance tripping and isolates faults to a single circuit, rather than cutting power to the whole home.

Book your fuse box installation with Smart Property Checks

Protect your home with a modern, compliant consumer unit. Book your fuse box installation with Smart Property Checks and let our electricians take care of the rest.

Arrange your fuse box upgrade and get a safe, certified installation.