Choosing vehicles for a taxi fleet: petrol, hybrid or electric?

Picking the best car for a taxi business in the UK starts with your council's rulebook, not the showroom. A car that's cheap to run is no use if the council won't plate it, or will only plate it for a few years. This guide sets out the vehicle rules in two named licensing areas, what the Clean Air Zones charge, and how to compare petrol, hybrid and electric running costs with real unit prices.

What will your council license?

Each council sets its own vehicle policy, so read yours first. Bristol and London show how far apart two licensing areas can be.

Bristol City Council licenses new private hire vehicles only if they're petrol, petrol hybrid or an ultra low emission vehicle (ULEV, which Bristol defines as tailpipe CO2 of 75 g/km or less), and diesel ULEVs are excluded. The Licensing Manager can make exceptions for executive vehicles. Hackney carriages are stricter: a new one must be a ULEV, purpose-built with whole vehicle type approval, wheelchair accessible and painted Bristol Blue. Bristol also caps hackney carriage vehicle licences at 795, so check one is free before you buy. A new vehicle licence costs £251 for a year.

In London, Transport for London has required every private hire vehicle licensed for the first time to be zero emission capable (ZEC) and Euro 6 since 1 January 2023. For a private hire car, ZEC means no more than 50 g/km of CO2 with at least 10 miles of zero emission range, or no more than 75 g/km with at least 20 miles. Since 1 January 2018, taxis licensed in London for the first time have had to be ZEC, with no more than 50 g/km and at least 30 miles of zero emission range.

The Department for Transport's best practice guidance pulls the other way on age. It tells licensing authorities they "should not impose age limits" and should set targeted rules on emissions, safety and wheelchair access instead. Councils still set their own, and the Transport Committee's 2026 report lists age limits and emissions rules among the requirements that vary from one council to the next. Your council's policy is what decides.

How old can a licensed car be?

The limit depends on the council and the fuel. Bristol and TfL publish theirs:

By law, private hire vehicles at least three years old and all taxis must pass an MOT or equivalent test at least once a year. The DfT guidance suggests an annual test for licensed vehicles of any age, with more frequent tests for older cars where local conditions call for it.

An age limit changes the sum on a used car. In Bristol a car first registered in 2024 can be licensed until 2036 at the latest, and once it's over eight years old it needs a test every six months.

Do Clean Air Zones charge taxis and private hire cars?

Yes, in every class of zone. Gov.uk lists seven charging Clean Air Zones in England: Bath (class C), Birmingham (D), Bradford (C), Bristol (D), Portsmouth (B), Sheffield (C) and Tyneside, covering Newcastle and Gateshead (C). Taxis and private hire vehicles fall into all four classes, A to D.

To avoid the charge, a taxi or private hire car must meet at least Euro 6 for diesel or Euro 4 for petrol. Gov.uk adds that local authorities may set a different standard for taxis and private hire vehicles, so check with the council that runs the zone. Ultra low emission vehicles get a national exemption.

What it costs varies by city. Bristol charges £9 a day for taxis that don't meet the standard. Birmingham's rules say a hybrid only avoids the fee if its petrol or diesel engine meets the standard. In London, private hire vehicles that don't meet the Ultra Low Emission Zone standards pay £12.50 a day.

If you run two or more vehicles, gov.uk lets a business set up an account to check and pay for its whole fleet in one place.

Petrol, hybrid or electric: which is cheaper to run?

The answer depends on the car, the work and how you charge it, so do the sum with real unit prices. Start with these:

Then put in your own car's figures:

• Petrol or diesel: pence per litre × 4.546, divided by miles per gallon, gives pence per mile.
• Electric: pence per kWh, divided by miles per kWh, gives pence per mile.

Example, with made-up efficiency figures: a petrol car returning 50 miles per gallon costs 174.88 × 4.546 ÷ 50 = 15.9p a mile in fuel. An electric car doing 3.5 miles per kWh on home charging at 26.32p costs 7.5p a mile. Use the manufacturer's figures, or better, your own fuel records.

A few more things change that sum. Public chargers set their own prices, which you'll need to check for the ones your drivers use. From the second year, vehicle tax is the same £200 a year whatever the fuel, unless the car's list price brings in the extra £440. And some new zero emission cars come with a government grant, taken off the price by the seller: up to £3,750 for cars in Band 1 and £1,500 in Band 2. The DfT guidance also warns that some electric vehicles are hard to convert for wheelchair users, which matters if you need accessible cars. There's more in our guide to moving a taxi fleet to electric.

Should some of your fleet be wheelchair accessible?

If you run hackney carriages in Bristol, every one must be. For private hire it's a business choice, but a gap in the market. The Department for Transport counted 34,500 wheelchair accessible taxis and private hire vehicles in England on 1 April 2026: 54% of licensed taxis, but only 2% of licensed private hire vehicles.

A wheelchair accessible vehicle conversion of an eligible zero emission car can come with a 35% discount, up to £2,500, through the government grant. The Equality Act duties that come with an accessible car are in our guide to wheelchair accessible taxi rules.

What size of car does the council accept?

Some councils set minimum sizes, and they can rule out popular models. Bristol's policy requires at least four doors, right-hand drive and set seat measurements, including 865mm of headroom above the seat cushions and 750mm between the back of the front seats and the rear backrest. It names the current Toyota Auris as too small for new private hire licences, and the Lexus IS300 for no more than three passengers. Bristol says the back row in many people carriers doesn't meet its sizes, and licenses those for up to four passengers only.

The DfT guidance says a licensed car shouldn't carry more people than it has seatbelts, and warns that ruling out people carriers that seat up to 8 passengers may be too restrictive. Bristol's fleet services team will measure a car before you buy it, for a small fee. That's money well spent on a model you haven't licensed before.

What should you check before you buy a car for the fleet?

Work through these in order, before you pay a deposit:

1. Read your council's vehicle policy: fuel types, age at first licence, upper age limit, size and colour rules.
2. Check the Euro standard and CO2 figure on the V5C against your council's rules and any Clean Air Zone you'll drive into.
3. Work out how many years of licensing the car has left, and price the six-monthly tests near the end.
4. Price the fuel or charging per mile with your own figures.
5. Get a hire and reward insurance quote for that model, as set out in our guide to taxi business insurance.
6. Decide whether the car needs to take a wheelchair.

Whatever runs your bookings, paper or software like Dispatch AI (booking and dispatch software for taxi and private hire firms), note each car's licensed seats and whether it takes a wheelchair, so the office gives each job to a car that can do it. The rest of the set-up is in the starting a taxi firm guides.