What You Need to Install a Home EV Charger

A home wallbox will charge your EV five to ten times faster than a three-pin socket, but the installation is a regulated electrical job — not a DIY afternoon project. Before a certified electrician can fit your charger, they will run through a checklist of electrical, physical, and regulatory requirements. Knowing what is on that list in advance helps you avoid surprises, budget accurately, and pick the right charger. Here is everything you need to have in place.

1. Incoming supply capacity

A 100 A single-phase supply is the comfortable baseline for a 7.4 kW charger. Most UK homes built after the 1990s have a 100 A main fuse at the meter, which leaves enough headroom for a 32 A charger circuit alongside normal household loads. A 60 A supply can technically support a 7 kW charger but leaves very little margin — your installer may recommend a load-management device that throttles the charger when other high-draw appliances (oven, heat pump, immersion heater) are running simultaneously. If your property still has an older 60 A or 80 A cut-out fuse, your installer will confirm whether it needs upgrading; that work is carried out by your Distribution Network Operator (DNO), not the EV charger installer, and is normally free of charge.

2. Consumer unit (fuse board) space

Your consumer unit needs one free slot for a dedicated 32 A circuit breaker. The charger must run on its own radial circuit — you cannot branch it from an existing ring main. A 32 A MCB (or, more commonly now, a 32 A RCBO which combines overcurrent and residual-current protection in a single unit) is the standard protection device. BS 7671:2018+A2:2022 requires Type-A or Type-B RCD protection on EV charger circuits, and many modern RCBO-equipped consumer units already meet this. If your board is full, an upgrade is needed before the charger can be installed. Older rewirable-fuse boards (common in pre-1980s homes) will almost certainly require a full replacement.

3. Earthing arrangement

PME (TN-C-S) supplies — the most common in the UK — require additional earth protection for outdoor EV chargers. Most UK homes use a PME (Protective Multiple Earthing) supply, where the neutral and earth are combined in the distribution network. Under BS 7671:2018 Section 722.411.4.1, an outdoor EV charger on a PME supply cannot rely on the PME earth alone, because a fault on the local network could place a dangerous voltage on the car body. Your installer must provide one of three compliant solutions: an earth electrode (earth rod, typically to 15 Ω or below) buried at the charger location; an external PEN fault detection device that disconnects on loss of earth; or a charger with verified built-in PEN protection. TT earthing systems (common in rural areas, where the supply earth is entirely local) do not have PME, so an earth rod is always required — but there is no PME prohibition risk to manage separately.

4. Cable sizing and run length

6 mm² twin-and-earth cable is standard for runs up to around 10–15 metres in most domestic conditions; 10 mm² is needed for longer runs. The exact cable cross-section depends on installation method (clipped to surface, run in insulation, buried), ambient temperature, and any derating factors. As a rough guide: a surface-clipped 6 mm² run of up to 10 m will handle 32 A comfortably with minimal voltage drop; runs beyond that, or cables buried in thermal insulation, typically require 10 mm². Where the charger is in a garage or outbuilding served by an armoured cable (SWA), the armour provides mechanical protection and may also serve as the earth path. Your installer will calculate the exact spec to BS 7671.

5. Wi-Fi availability at the charger location

A stable Wi-Fi signal is a hard requirement for smart chargers — and smart chargers are required for government grant eligibility. The OZEV grant scheme requires an OZEV-approved smart charger, and those chargers must connect to your home network to enable remote scheduling, demand-side response, and load management. If your garage or driveway has a weak signal, a Wi-Fi extender or a powerline adapter is a cheap fix that should be sorted before installation day to avoid a wasted visit.

6. OZEV grant eligibility

The EV Chargepoint Grant is now worth up to £500 — but only for renters, flat owners, and landlords, not owner-occupiers of houses. From 1 April 2026, the grant increased from £350 to £500 per socket (75% of installed cost, up to the cap). Owner-occupiers of houses lost eligibility in 2023; the grant now covers people who rent and live in any residential property, or who own and live in a flat, provided they have private off-street or allocated parking. Funding is confirmed until 31 March 2027. You must use an OZEV-approved installer, and any landlord or freeholder permission must be in place before applying. Check current eligibility at gov.uk. If you are pairing your charger with solar panels, you may also qualify for the solar grants available in the UK to reduce the overall project cost.

7. DNO notification (G98)

A standard 7.4 kW single-phase charger falls under G98 — "connect and notify" — meaning your installer can fit and commission the charger and then notify the DNO within 28 days. No prior approval is required. G98 applies where the charger draws 16 A or less per phase and the total household demand does not push the property over 60 A. If your property has an unusual load profile, or you are planning a three-phase or vehicle-to-grid (V2G) charger, a G99 application (prior approval, typically up to 45 working days) is needed instead. Your certified installer will determine which route applies and submit the notification on your behalf — this is included in a standard installation.

8. Certified installer and building regulations

All domestic EV charger installations are notifiable work under Part P of the Building Regulations, and your installer must be registered with a Competent Person Scheme. The main schemes accepting EV charger installers are NICEIC, NAPIT, ELECSA, and ECA. Registration means the installer self-certifies the work, issues a BS 7671 Electrical Installation Certificate, and notifies the local building authority on your behalf — you do not need to do this separately. Never use an unregistered electrician for EV charger work; without a certificate you will have difficulty with insurance claims and resale. Installation takes a typical day for a straightforward house installation with the charger adjacent to the consumer unit.

9. Property type and parking

A dedicated off-street parking space is the one requirement that cannot be engineered around. Wallbox chargers are designed for fixed, private parking — driveways, garages, allocated parking bays. Terraced houses with no driveway, or flats without a dedicated bay, are not suitable for a personal wallbox. Renters and flat owners who do have private parking remain eligible for the OZEV grant (see above). If you are considering pairing your charger with solar, a smart charger can be configured to prioritise charging from your own generation — see our guide to EV charging with solar panels for how that works in practice.

Quick-reference checklist

100 A main fuse (60 A acceptable with load management)
Spare 32 A RCBO slot in consumer unit (or board upgrade)
PME earth protection: earth rod, PEN detector, or built-in charger protection
Cable route planned: 6 mm² up to ~10–15 m; 10 mm² for longer/buried runs
Wi-Fi signal at charger location (for smart/grant-eligible charger)
OZEV grant check: renters, flat owners, and landlords up to £500 (from Apr 2026)
G98 DNO notification submitted within 28 days of commissioning (your installer does this)
NICEIC / NAPIT / ELECSA installer; Part P self-certification certificate issued
Private off-street parking at the property

Once all these boxes are ticked, the installation itself is typically a one-day job. Costs vary by complexity but most standard house installations run between £800 and £1,200 all-in. For a deeper look at charger models and features, see our best home EV charger UK roundup.