Fuse Board Upgrade in Barnstaple and Why You Might Need One

Published October 2026 | Fuse Board Upgrade

Why Your Home Might Need a Fuse Board Upgrade

A fuse board - also called a consumer unit - is the nerve centre of your home's electrical system. It distributes power across every circuit in the property and is designed to cut off supply if a fault develops. When that board is old, underspecified, or not built to modern standards, it can't protect your home effectively.

There are several reasons our engineers see Barnstaple homeowners needing a fuse board upgrade. The most common is age. If your board was installed before the late 1990s, it's likely missing the protection that modern homes require. Older boards typically relied on cartridge fuses or rewirable fuses - both of which react far more slowly to faults than today's circuit breakers. Some older boards don't trip at all until a cable has been significantly overloaded.

The second driver is changes in how we use electricity. Over the past decade, homes have taken on far more electrical load than they were designed for. Electric vehicle chargers, induction hobs, heat pumps, hot tubs, home offices with server equipment - each of these puts new demands on a system that may have been wired for a kettle and a television. If your existing board can't accommodate the extra circuits needed for these additions, an upgrade is necessary.

A third reason is a failed Electrical Installation Condition Report (EICR). If you've had an inspection - perhaps because you're letting the property or you've just moved in - and the electrician has flagged the consumer unit as requiring remedial work, a replacement is likely on the cards. In many cases in Devon, our engineers find that an EICR has returned an "unsatisfactory" result on older boards precisely because they lack the RCD protection that current wiring regulations require.

How to Tell Whether Your Fuse Board Needs Replacing

You don't need to be an electrician to spot the warning signs. Here's how to assess what you've got before calling anyone out:

1. Look at the board itself. Open the cover and examine what's inside. If you see a row of ceramic fuse holders with wire running through them, that's a rewirable fuse board - often called an "old-style" board. If you see individual plastic switches (circuit breakers) but no separate RCD switches, that's a slightly more modern board but still likely missing full protection.
2. Count the RCDs. An RCD (residual current device) is typically a wider switch at one end of the board. If there's no RCD at all, that's a significant gap in your protection. A modern board will have at least one RCD covering the majority of circuits, and a fully upgraded board may use individual RCBOs on each circuit.
3. Check how often it trips. If you're regularly resetting tripped breakers for no obvious reason, that can indicate a fault elsewhere - but it can also mean the board itself is deteriorating. Our engineers use the Voltrade GoFIX diagnostic tool to help pinpoint whether the issue lies with the board or with a specific circuit before recommending any work.
4. Look for scorch marks or a burning smell. Any sign of heat damage around the fuse board - discolouration, a burning smell, or marks on the casing - is serious. Don't ignore it. Call an electrician the same day.
5. Consider the age of the property and any previous electrical work. If you're in a pre-1990s property and have no record of electrical work being done since you moved in, assume the board may be original and get it assessed.

If you're unsure after going through these checks, booking a visual survey with a local Barnstaple electrician is the sensible move. Most will give you an honest assessment before quoting any work. As the guidance notes, a fuse board upgrade isn't simply about swapping one box for another - a good electrician will consider the condition of the wider installation and what protection your property actually needs going forward.

DIY vs Professional - What You Can and Can't Do

This is worth addressing clearly: you cannot legally replace a consumer unit yourself unless you're a registered electrician working within an approved scheme. This isn't a job where the risk is simply getting it wrong - it's a job where getting it wrong can cause fires, electrocution, and deaths.

What you can do yourself is gather information. Walk through the checklist above. Take photos of your existing board. Note down the circuits you have and any new ones you're planning to add. This prep work saves time when the electrician arrives and helps you ask the right questions.

You can also reset tripped breakers yourself - that's fine. If a breaker trips and won't reset, or if it trips repeatedly in the same circumstances, that's when you call a professional.

For everything beyond that - opening the board, touching the wiring, attempting any modification - the answer is no. The incoming supply to your consumer unit is live even when the main switch is off, because it comes directly from the meter. There is no safe way to work on this as a householder.

Our engineers cover the Barnstaple area regularly, and they often encounter situations where homeowners have attempted minor electrical work that's created more problems than it solved. The cost of putting it right is always higher than the cost of doing it properly the first time.

What a Qualified Electrician Will Do During a Fuse Board Upgrade

A fuse board upgrade is a structured process. Here's what to expect when you book the work with a qualified electrician in Barnstaple:

1. Initial survey. Before any work starts, the electrician will assess your existing installation. They'll check the condition of your wiring, identify how many circuits you have, and work out what size and type of consumer unit you need. This is also when they'll flag any other issues - older rubber-sheathed cables that may need replacing, for instance, before the new board is safely connected.
2. Isolating the supply. The electrician will arrange for the incoming supply to be isolated, working with your Distribution Network Operator (DNO) if needed. Your power will be off for most of the working day, so plan accordingly.
3. Removing the old unit. The existing consumer unit is carefully disconnected and removed. Each circuit cable is labelled as it's disconnected, which makes reinstallation accurate and ensures nothing ends up on the wrong breaker.
4. Fitting the new board. The new consumer unit is mounted and circuits are connected to the appropriate breakers. In a modern installation, circuits are grouped logically - lights, sockets, kitchen, bathroom, and so on - with appropriate protection levels on each.
5. Testing. This is not optional and it's not quick. A proper fuse board upgrade includes full testing of every circuit - insulation resistance, continuity, polarity, and RCD performance. This can take several hours, especially on a larger property.

Costs and What Affects the Price

A fuse board upgrade typically costs between 400 and 800 pounds in the UK, depending on the size of your property and the number of circuits involved. A small two-bedroom flat with eight circuits will cost noticeably less than a five-bedroom house with sixteen circuits, a garage supply, and an outdoor socket ring.

Here's what affects the final price:

• Number of circuits. More circuits mean more breakers, more testing time, and more materials. This is the single biggest variable in the quote.
• Type of consumer unit. A standard dual-RCD board is cheaper than a fully RCBO-protected unit where each circuit has its own individual device. The latter offers better fault isolation - if one circuit trips, it doesn't knock out half the house - but it costs more upfront.
• Condition of existing wiring. If the electrician finds older wiring that isn't safe to reconnect to the new board, that remedial work will need to be quoted separately. This is fairly common in older Devon properties, particularly those built before the 1960s.
• Additional work required. Sometimes a board upgrade reveals other issues - a corroded earthing conductor, circuits added without proper fusing, or an outdoor sub-board that needs weatherproofing. These extras add cost but are better dealt with now than later.
• Access and location. If your board is in an awkward location - a cramped cupboard under the stairs, a tight loft space - it simply takes longer to work on safely.

Get at least two quotes from local electricians before committing, and make sure both quotes cover the same scope. A quote that looks cheaper may be based on fewer circuits tested or a lower-specification board that won't meet your long-term needs.

How to Keep Your Electrical Installation in Good Shape After an Upgrade

A new fuse board is a significant investment in your home's safety, but it's not something you fit and forget. Here's how to maintain the standard of your installation going forward:

Get regular EICRs. For owner-occupied homes, the recommended interval is every ten years. If you're a landlord in Devon, current requirements mean you need an EICR at least every five years or at each change of tenancy. These reports catch deterioration before it becomes dangerous.

Test your RCDs monthly. There's a test button on your RCD switches - press it. The switch should trip immediately. If it doesn't, or if the switch won't reset after testing, call an electrician. This takes about thirty seconds and is one of the most effective safety checks a homeowner can do.

Don't overload circuits. Extension leads and multi-adapters are fine in moderation, but daisy-chaining them creates overload risk. If you're regularly running out of sockets in a room, the solution is a properly installed additional socket - not another extension lead.

Tell an electrician before adding significant new loads. If you're planning to install an EV charger, a hot tub, or an air source heat pump, have the conversation with an electrician first. They may need to add a dedicated circuit or assess whether your current board can handle the extra demand safely.

Keep the area around your board clear. Don't store boxes, coats, or clutter in front of your consumer unit. In an emergency, you need to reach the main switch immediately.

Frequently Asked Questions

How long does a fuse board upgrade take?

Most fuse board upgrades take between four and eight hours, depending on the size of the property and the number of circuits. Our engineers typically complete a standard three-bedroom house in a full working day. You'll be without power for most of that time, so it's worth planning ahead - charge devices the night before, and plan meals that don't require cooking.

Do I need a new fuse board if my existing one still works?

"Still working" is a low bar electrical safety. If your board uses rewirable fuses or lacks RCD protection, it may be functioning but not meeting modern safety standards. Our engineers would recommend getting an EICR done first - that gives you an independent, evidence-based view of whether a replacement is needed, rather than making a decision without the full picture.

Can a fuse board upgrade be done on a rental property?

Yes, and in many cases it's essential. If an EICR on your rental property returns an unsatisfactory result because of the consumer unit, the work needs to be completed before the property can be re-let. Your electrician will issue the appropriate certification once the upgrade is complete, which you'll need to retain for your records and provide evidence of to your tenants.

What is the difference between an RCD and an RCBO?

An RCD (residual current device) protects a group of circuits together - if one circuit develops a fault, the RCD disconnects all circuits under it. An RCBO combines overcurrent and residual current protection in a single device and covers one circuit only. RCBO-fitted boards cost more but are more convenient because a fault on one circuit won't knock out the lights and sockets across the rest of your home.

Will a new fuse board in Barnstaple add value to my property?

It's unlikely to add directly measurable value in the way a kitchen renovation might, but it can remove a barrier to sale. Buyers and their surveyors regularly flag old-style consumer units as requiring attention. Having a modern, certified board already installed can smooth the conveyancing process and reduce the risk of a price renegotiation or delayed exchange because of concerns raised in the buyer's survey.