EV Charger Installation in London: OZEV Grants, Load Assessment, and What to Expect

The Growth of EV Charging in London

Electric vehicle ownership in London is growing rapidly, driven by the Ultra Low Emission Zone expansion, the 2035 new petrol and diesel car ban deadline, and significant improvements in EV range and affordability. For homeowners with off-street parking, a dedicated home EV charger is far more convenient and cost-effective than relying on public charging networks. The installation process is more involved than fitting a standard electrical appliance, but with proper planning it is straightforward for most London properties.

OZEV Grant Eligibility

The Office for Zero Emission Vehicles (OZEV) administers the Electric Vehicle Chargepoint Grant (EVCG), which provides a 75% subsidy up to a maximum of £350 towards the cost of purchasing and installing a home EV charger. To qualify, you must own or have ordered a qualifying electric or plug-in hybrid vehicle, you must own or have permission from your landlord to install the charger, and the charger must be installed by an OZEV-authorised installer. The grant is applied directly by the installer — you pay the net cost. Check current eligibility criteria on the GOV.UK OZEV page as thresholds and qualifying vehicle lists are updated periodically.

Load Assessment: Can Your Property's Supply Handle an EV Charger?

A standard 7.4kW home EV charger draws approximately 32 amps when charging at full rate. Before installation, your installer must carry out an electrical load assessment to verify that your existing supply capacity can accommodate this additional load without tripping your main fuse. Most post-1990 London properties with a 100-amp main fuse have adequate headroom. Older properties, particularly Victorian terraces in areas like Islington, Hackney, or Peckham, may have 60-amp or 80-amp service heads that limit simultaneous load. Where capacity is insufficient, a dynamic load management (DLM) system can be fitted that automatically reduces the charger's output when other high-demand appliances are running, eliminating the need for a costly supply upgrade in most cases.

Consumer Unit Requirements

An EV charger requires a dedicated circuit with its own MCB (miniature circuit breaker) and RCD (residual current device) protection. If your consumer unit is full, lacks adequate protective devices, or is an older rewireable fuse board, your installer will likely recommend a consumer unit upgrade as part of the installation. This adds to the overall cost but also brings your main electrical protection up to current standards — a worthwhile improvement. All consumer unit upgrades must be notified to your local building control authority under Part P of the Building Regulations.

Cable Routing Considerations

Cable routing from the consumer unit to the charging point is often the most complex element of a London home installation. In terrace properties, the consumer unit is typically at the front of the house and the parking is at the rear, requiring cable to run through the property or around the external perimeter. Discuss routing options with your installer before committing — surface-run conduit, buried armoured cable, or internally routed cable all have different cost implications and aesthetic impacts. For flats and apartments, written consent from the freeholder or managing agent will be required before any work begins.

Smart Charging and the 2022 Regulations

Since June 2022, all new home EV chargers installed in England must be smart chargers capable of responding to time-of-use electricity tariffs and grid demand signals. This is a legal requirement under the Electric Vehicles (Smart Charge Points) Regulations 2021. Smart chargers allow you to schedule charging during off-peak tariff periods — typically overnight — which can reduce charging costs significantly compared with daytime charging. Ensure your installer provides a charger that complies with these regulations and that the associated app is compatible with your home Wi-Fi network.

Finding a Qualified Installer

Only OZEV-authorised installers can apply the government grant. They must also be registered with NICEIC, NAPIT, or another competent person scheme for electrical work. Prestige Engineers is OZEV-authorised and covers EV charger installations across London, with experience in Victorian terrace supply constraints, flat and apartment installations, and multi-unit landlord installations.