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Surge protection has become a hot topic in UK electrics—mainly because new consumer units often include it by default. But do you actually need it? Here’s everything homeowners should know.

🔌 What Is Surge Protection?
Surge protection devices (SPDs) protect your home’s electrics from sudden spikes in voltage.
These spikes can come from:
-Lightning strikes
-Problems on the National Grid
-Switching large appliances on/off (e.g., fridges, boilers, EV chargers)
-Faults in your local supply
A surge can damage sensitive electronics like:
-TVs
-PCs
-Smart devices
-Washing machines
-EV chargers
-Boilers and heating controls
Modern homes have more electronics than ever—so the need for protection is increasing.

⚡ Do You Legally Need Surge Protection?
Under the current wiring regulations (BS 7671:2018 Amendment 2), surge protection is required unless the homeowner/client agrees it’s not needed after a risk assessment.
In plain English:
You don’t legally have to install surge protection, but the electrician must explain the risks of not having it — and it’s usually recommended.
For most domestic homes, the answer is now:
Yes, SPDs are recommended and often expected on new consumer units.

🏡 When Surge Protection Is Especially Important
You should definitely have an SPD if:
-You have expensive electronics (TVs, computers, gaming consoles)
-You work from home
-You have a home office, servers, or CCTV
-You have a smart home setup
-You have a new consumer unit
-You have an EV charger or solar/battery system
-Your property is in an area prone to storms
-Your supply comes via overhead lines
If you’re upgrading your fuse box, most modern consumer units include surge protection as standard.

💸 How Much Does Surge Protection Cost?
Typical UK prices:
SPD added to a consumer unit: £60–£120 (device cost)
Installation with a new consumer unit: Usually included
Retrofitting an SPD into an existing board: £120–£200 depending on space and board type
It’s usually a small cost compared to the potential damage a surge could cause.

🧰 Can Surge Protection Be Added to an Older Fuse Box?
Sometimes, yes:
-Many modern consumer units can have SPDs retrofitted.
-Older fuse boxes with rewireable fuses usually cannot, and would need an upgrade.
If your board is very old, upgrading your consumer unit may be the safer and more cost-effective option.

🔍 Signs You Should Consider Adding Surge Protection
You should strongly consider installing an SPD if:
-Your consumer unit is more than 15–20 years old
-Lighting flickers when appliances start
-Your area suffers regular power cuts
-You’ve had appliances fail for “no reason”
-You’re installing expensive equipment (heat pumps, EV chargers, tech)

✔️ So, Do You Need Surge Protection? (Short Answer)
It’s not legally mandatory, but in 2025 it is strongly recommended for almost every UK home.
The cost is relatively low, and it offers valuable protection for your electrical system and your expensive electronics. Most electricians will recommend fitting one—especially during a board upgrade.

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24/11/2025

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