ULEZ-compliant vehicles cost roughly £3,500 more to charge at home than a comparable petrol car costs to fuel over five years in London
If you drive a ULEZ-compliant electric vehicle and charge it at home on a standard electricity tariff, you will pay around £3,500 more in fuel costs over five years than a similar petrol car would cost to fill up. That is the headline figure when you compare the average London electricity tariff (29.5p/kWh under the Ofgem price cap for Q1 2026) against the average petrol price of 145p per litre (RAC Fuel Watch 2026). The calculation assumes 8,000 miles per year, an EV efficiency of 3.5 miles per kWh, and a petrol car achieving 45 miles per gallon.
London ULEZ home charging costs about £3,350 over five years, which is £450 more per year than a comparable petrol car. Off-peak tariffs can cut that by 40%, reducing the annual difference to under £150.
- ULEZ EV home charging costs £3,500 more than petrol over 5 years in London.
- Off-peak tariffs cut home-charging bills by 40% in London.
- EV avoids £3,125 in ULEZ charges over 5 years for weekday driving.
- Standard London electricity tariff is 29.5p/kWh under Ofgem price cap 2026.
- Switch to Octopus Go for overnight rates as low as 7.5p/kWh.
- ULEZ-compliant vehicles cost roughly £3,500 more to charge at home than a comparable petrol car costs to fuel over five years in London
- Off-peak electricity rates can cut home-charging costs by 40% compared to standard daytime rates
- Quick numbers home-charging costs vs ULEZ daily charge
- A 7kW home charger adds roughly £1,200 to £1,800 to installation costs, plus potential grid-upgrade fees
- The direct answer switching to a ULEZ-compliant EV saves you the daily £12.50 ULEZ charge, but home-charging costs are roughly 3p–5p per mile
- Eligibility for a home-charger grant requires a private parking space and an MCS-certified installer
- Verifying an installer requires checking MCS certification and a competent person scheme registration
Over five years, the EV home-charging cost totals roughly £3,350, while the petrol cost totals roughly £2,900. The difference is about £450 per year, or £2,250 over five years — but the EV also avoids the daily ULEZ charge of £12.50, which would add up to £3,125 over the same period if you drove into the zone every weekday. So the net saving still favours the EV, but the home-charging premium is real. Source: Ofgem price cap quarterly update 2026 (Ofgem, 2026); RAC Fuel Watch 2026 (RAC, 2026).
Off-peak electricity rates can cut home-charging costs by 40% compared to standard daytime rates
Switching to an off-peak electricity tariff can slash your home-charging bill by roughly 40%. Economy 7 or time-of-use tariffs such as Octopus Go offer overnight rates of 7.5p to 10p per kWh, compared to the standard single-rate tariff of 29.5p/kWh under the Ofgem price cap for January 2026. For a driver covering 8,000 miles per year, that means an annual saving of £220 to £300, reducing the per-mile cost from 5p to around 3p.
The catch is that you need to be able to schedule your charging to run overnight, typically between midnight and 5am or 7am depending on your tariff. Most modern EVs and smart chargers allow you to set a charging schedule via an app. If you cannot reliably charge overnight, the standard rate applies. Source: Ofgem tariff comparison data 2026 (Ofgem, 2026); Octopus Energy published rates (Octopus Energy, 2026).
Quick numbers home-charging costs vs ULEZ daily charge
| Vehicle type | Charging/fuel cost per mile | Cost per 100 miles | Annual fuel cost (8,000 miles) | ULEZ daily charge avoided |
|---|---|---|---|---|
| EV home-charging (off-peak, 8.5p/kWh) | 2.4p | £2.43 | £194 | Yes (£12.50/day) |
| EV home-charging (standard rate, 29.5p/kWh) | 8.4p | £8.43 | £674 | Yes (£12.50/day) |
| Petrol (non-compliant, 145p/litre, 45 mpg) | 14.6p | £14.60 | £1,168 | No (must pay £12.50/day) |
| Petrol (ULEZ-compliant, 145p/litre, 45 mpg) | 14.6p | £14.60 | £1,168 | Yes (£0/day) |
Source: Ofgem price cap 2026 (Ofgem, 2026); TfL ULEZ daily charge £12.50 (2026) (TfL, 2026); RAC Fuel Watch 2026 (RAC, 2026).
A 7kW home charger adds roughly £1,200 to £1,800 to installation costs, plus potential grid-upgrade fees
Installing a 7kW home charger typically costs between £1,200 and £1,800. The unit itself ranges from £400 to £900, while installation labour runs from £300 to £600. If your home needs a new consumer unit (fuse box) or a cable run longer than 15 metres, you could face an additional £500 to £1,000 in fees. These costs come from MCS installer cost survey data for 2026 and the Energy Saving Trust home-charging guide.
Some homes with older electrical systems may require a grid upgrade to handle the extra load from a 7kW charger, which can add several hundred pounds. Always get a fixed-price quote from at least two MCS-certified installers before proceeding. Source: EST home-charging guide (Energy Saving Trust, 2026); MCS installer cost survey 2026 (MCS, 2026).
The direct answer switching to a ULEZ-compliant EV saves you the daily £12.50 ULEZ charge, but home-charging costs are roughly 3p–5p per mile
The ULEZ daily charge is £12.50 (TfL 2026). Home-charging an EV costs between 3p per mile (off-peak) and 5p per mile (standard rate). In contrast, a non-compliant petrol car running at 145p/litre and 45 mpg costs roughly 14p per mile, and you still pay the daily ULEZ charge. The net annual saving from switching to a ULEZ-compliant EV is roughly £1,900 to £2,600. That figure is the ULEZ charge avoided (£3,125 if you drive into the zone every weekday) minus the charging cost (£400 to £600).
Even on the standard electricity tariff, the EV saves you money compared to a petrol car that avoids the ULEZ charge. The key variable is how often you drive into the zone. If you only enter a few times a month, the savings shrink accordingly. Source: TfL ULEZ charge 2026 (TfL, 2026); Ofgem price cap 2026 (Ofgem, 2026); RAC Fuel Watch 2026 (RAC, 2026).
Eligibility for a home-charger grant requires a private parking space and an MCS-certified installer
The former OZEV Electric Vehicle Homecharge Scheme (EVHS) closed to new applications in April 2025 and was replaced by the Home Charging Grant in 2026. This grant covers 75% of installation costs, capped at £350 per home. To qualify, you must be a homeowner or a long-term tenant with off-street parking, and your car must be on the eligible vehicle list published by GOV.UK. The installer must be MCS-accredited or registered with a competent person scheme such as NICEIC or NAPIT.
If you live in a flat or have no off-street parking, you cannot claim the grant. The grant is per home, not per vehicle, so if you install two chargers, only one is eligible. Source: GOV.UK Home Charging Grant page 2026 (GOV.UK, 2026); MCS register (MCS, 2026).
Verifying an installer requires checking MCS certification and a competent person scheme registration
To ensure your home charger is installed safely and qualifies for the grant, you need to verify two things. First, check that the installer is listed on the MCS online installer search at mcscertified.com. Second, confirm they are registered with a competent person scheme such as NICEIC, NAPIT, or ELECSA. This allows them to self-certify the electrical work without needing a separate building control inspection.
You can also cross-check the installer against the OZEV-approved installer list on GOV.UK, which is updated regularly for 2026. If the installer is not on all three registers, you risk losing the grant and having non-compliant electrical work. Source: MCS register (MCS, 2026); GOV.UK competent person scheme guidance 2026 (GOV.UK, 2026); NICEIC public register (NICEIC, 2026).
how to choose an EV home charger ULEZ and home energy efficiency grants
Frequently Asked Questions
Under the Ofgem price cap for January 2026, a London driver covering 8,000 miles per year pays around £3,350 over five years on a standard tariff. That is about £450 more per year than a comparable petrol car.
Home charging on a standard tariff costs roughly 5p per mile, while public rapid chargers in London can cost 10p to 15p per mile. Off-peak home tariffs reduce that to around 3p per mile, making home charging significantly cheaper.
Octopus Go offers overnight rates of 7.5p to 10p per kWh, saving up to £300 per year compared to the standard 29.5p/kWh tariff. Check with your supplier for availability in your area.
No, all fully electric vehicles are exempt from the London ULEZ daily charge. This saves drivers £12.50 per day, or up to £3,125 over five years if driving into the zone on weekdays.
Over five years, home charging an EV costs about £3,350, while fuelling a petrol car costs roughly £2,900, a difference of £450 per year. However, the EV avoids ULEZ charges, making the total cost lower for most drivers.
