Getting quotes for a home charge point and wondering why some electricians mention extra work before they’ve even seen your fuse board? EV charger installation often needs a consumer unit upgrade first, typically adding £400-£800 to the job, because a home charger draws up to 32 amps continuously – a sustained load that a lot of older UK consumer units simply weren’t built to handle alongside everything else in the house. Whether you actually need one depends on three specific things about your existing board, which we’ll walk through below.
As a NICEIC-registered electrical contractor covering Taunton, Bristol, Bath, Exeter and the wider Somerset and Devon area, we survey the consumer unit on every single EV charger job before quoting, precisely because guessing at this stage is how homeowners end up with a “surprise” bill halfway through installation day. This guide explains exactly what we’re checking for, so you know what to expect before we arrive.
Key Takeaways
- A home EV charger draws up to 32A continuously – a very different load profile to normal household appliances, and one that older consumer units weren’t designed around.
- Three things determine whether you need an upgrade: spare capacity on the board, the right type of RCD protection, and a main fuse rated high enough for the extra load.
- A consumer unit upgrade typically adds £400-£800 on top of the charger installation itself – but skipping it when it’s actually needed risks a charger that trips constantly, or a genuine fire safety issue.
How Much Load Does An EV Charger Actually Add?
A standard home EV charger draws up to 32 amps continuously, often for several hours at a stretch while a car charges overnight. That’s a fundamentally different kind of load to most household appliances, which draw high current only in short bursts – a kettle boils for a couple of minutes, a shower runs for ten. An EV charger just keeps pulling power, hour after hour.
Stack a 32A continuous draw on top of your existing circuits – cooker, electric shower, immersion heater, all the usual suspects – and it’s entirely possible to exceed 60A of demand during peak evening usage. That’s more than some older consumer units and main fuses were ever designed to carry, which is exactly why a proper survey matters before any quote gets finalised.
Three Signs You’ll Need A Consumer Unit Upgrade
Whether your existing board can safely take an EV charger circuit comes down to three checks, every time.
1. Is There A Spare Way On The Board?
An EV charger needs its own dedicated circuit – a “way” – on the consumer unit, protected by its own breaker. If your board is already full, we’ve got two options: fit a small supplementary consumer unit alongside the existing one, or replace the whole board with one that has enough capacity built in.
2. Does The Board Have The Right RCD Protection?
Consumer units installed before around 2008 often have no RCD (residual current device) protection at all. Even a lot of units installed after that date use Type AC RCDs, which aren’t suitable for the type of current an EV charger draws. EV charging circuits need Type A RCD protection as a minimum, and a board without the right RCD type has to be upgraded before a charger can be safely connected – this isn’t optional or a nice-to-have, it’s a wiring regulations requirement.
3. Is The Main Fuse Rated High Enough?
A lot of older UK homes still have a 60A main fuse. Add a 32A continuous EV charging load on top of existing household demand, and a 60A fuse can genuinely become the limiting factor. In these cases, we (or your local Distribution Network Operator) may need to arrange an upgrade to an 80A or 100A main fuse before installation can go ahead safely.
If your board already has a spare way, correct RCD protection, and sufficient main fuse capacity – no upgrade is needed. The charger circuit simply gets added to the existing board, and the whole job is quicker and cheaper.
What A Consumer Unit Upgrade Actually Involves
| Details | |
| Typical additional cost | £400–£800 on top of the charger installation |
| What’s included | New board (or supplementary unit), correct RCD/RCBO protection, rewiring of existing circuits into the new board |
| Time on site | Usually a full day, sometimes longer on older properties |
| What you get afterwards | An Electrical Installation Certificate confirming the board meets current wiring regulations |
| Power interruption | The whole house loses power for part of the day while the board is swapped over |
That Electrical Installation Certificate is worth keeping on file – it’s the kind of document a buyer’s solicitor or surveyor will ask about if you come to sell the property, and it’s proof the work was done to current regulations rather than as a bodge to get the charger fitted quickly.
Are You Eligible For A Grant Toward The Cost?
The government’s EV Chargepoint Grant still exists in 2026, but eligibility has narrowed considerably since the original OZEV scheme. Homeowners with a driveway who own a standard detached or semi-detached house are no longer eligible for it. The grant – worth up to £500 per socket from 1 April 2026 – is now targeted specifically at:
- Renters installing a charger at a rented property
- Flat owners, including owner-occupiers
- Landlords installing chargers for tenants
If any of these apply to you, it’s worth checking your eligibility on GOV.UK’s chargepoint grant guidance before assuming the whole cost is coming out of pocket.
Can I Install An EV Charger Without Off-Street Parking?
It’s more limited, but not automatically impossible. Cable channels or “cable gullies” running from the property to a kerbside charging point are permitted in some local authorities, though they’re subject to highway rules and local council approval, and not every council allows them. If you don’t have a driveway, it’s worth checking what your local authority permits, or looking at public/on-street charging infrastructure in your area as an alternative, before assuming home charging is off the table entirely.
How Long Does EV Charger Installation Take?
A straightforward installation where no consumer unit upgrade is needed usually takes half a day to a full day, including running the cable from the board to the charger location and commissioning the unit.
Add a consumer unit upgrade, and you’re looking at a full day, sometimes closer to a day and a half on older properties where existing wiring needs tidying up as part of the job.
Get An EV Charger Installation Quote
Complete Connectrix Ltd is a NICEIC-registered electrical contractor serving Taunton, Bristol, Bath, Exeter and the wider Somerset and Devon area, and we carry out EV charger installations and consumer unit upgrades as part of our day-to-day work.
Our electricians survey the existing board first, so you get an accurate price that includes any upgrade work needed rather than a quote that changes once we’re on site. Take a look at our electrical installation services and consumer unit page for more detail, or check our locations page to confirm we cover your area.
Not sure whether your board needs an upgrade? Get in touch with our team for a free EV charger survey and quote – we’ll tell you honestly whether you need the extra work or not.
Frequently Asked Questions
Do all EV chargers need a consumer unit upgrade?
No – only where the existing board lacks spare capacity, the right RCD protection, or a high enough rated main fuse. A lot of homes with a relatively modern consumer unit (post-2015 or so) already meet the requirements and just need the charger circuit added.
How much does EV charger installation cost without an upgrade?
A standard installation on a board that already meets requirements typically costs less than one needing an upgrade, since you’re only paying for the charger, cabling and commissioning rather than a new board too. Get a survey-based quote rather than relying on a generic online estimate, since every property’s existing wiring is different.
Can I get a grant for EV charger installation in 2026?
Only if you’re a renter, a flat owner (including owner-occupiers), or a landlord installing for tenants. Homeowners with a driveway on a standard house are no longer eligible under the current scheme rules – check GOV.UK’s guidance for the full criteria.
Will an EV charger trip my electrics if I don’t upgrade the board?
It can, particularly on older boards without the right RCD type, or where the main fuse is already close to its limit during peak household usage. Nuisance tripping is usually a sign the installation wasn’t properly surveyed first, rather than a fault with the charger itself.
How long does a consumer unit upgrade take?
Usually a full day, sometimes longer on older properties. Your power will be off for part of that day while the board is swapped over, so it’s worth planning around that if you work from home.
Is a consumer unit upgrade a legal requirement for EV chargers?
If your existing board doesn’t meet current wiring regulations for the additional load – insufficient RCD protection, or main fuse capacity – then yes, the upgrade is required to install the charger safely and compliantly, not an optional extra. A reputable electrician won’t fit a charger onto a board that doesn’t meet the requirements.