When to add more taxis to your fleet: the signs and the sums

Adding a car feels like the obvious answer when the phones are red hot on a Friday. Sometimes it is. Sometimes the real problem is the phones, or a quiet Tuesday that one more car would make quieter for everyone. This guide covers when to add more taxis, the numbers that tell you, whether to add drivers or cars, and the licensing steps before a new car carries anyone.

When should a taxi firm add more cars?

Add cars when you're short of them at hours you can predict, week after week, and the drivers you already have are busy at those hours. One bad night isn't a pattern. Four Fridays in a row with jobs turned away is.

The test has two halves, and you need both:

1. The demand is there. Jobs are being turned away, passed to other firms or lost to long waits, at the same times each week.
2. Your drivers are full at those times. If drivers are sitting idle while jobs are lost, the problem is the phones or the dispatching, not the number of cars.

What are the signs you're short of cars?

Five signs, and each one has a place you can check it:

The first sign is the one hardly anyone writes down. Start a tally today: every time someone says "sorry, no cars", or a caller turns down a long wait, note the day, the hour and the journey. Four weeks of that tells you more than a year of guessing.

Passing work on is legal if you do it properly. Section 55A of the Local Government (Miscellaneous Provisions) Act 1976 lets a licensed operator subcontract a booking to another licensed operator, and section 56(1) says the contract is still made with the operator who accepted the booking. So you keep the liability while the other firm keeps its share of the fare. Our guide to cross-border hiring and subcontracting covers the rules.

Which numbers tell you to add cars?

Three numbers, each worked out by hour of the week:

• Jobs per driver hour = completed jobs ÷ hours drivers were logged on and free to work.
• Utilisation = minutes spent on jobs, including the drive to the pickup, ÷ minutes logged on.
• Extra driver hours needed = jobs turned away × average minutes per job ÷ 60.

There's no reliable published benchmark for any of these in UK taxi firms, so compare your own hours against each other rather than against another firm.

Example, with made-up figures. Your average job takes 35 minutes, including the drive to the pickup.

On Friday, 15 jobs turned away × 35 minutes ÷ 60 = 8.75 extra driver hours. Over a 6-hour shift, that's about one and a half more cars. On Tuesday, the 6 drivers already on are idle about two-thirds of the time. A new full-time car would pick up Friday work, and on Tuesday it would split the same 14 jobs between 7 drivers instead of 6.

So the answer in this example isn't "add a car". It's "add Friday evening cover": a part-time driver, a driver moving a shift, or an arrangement to pass the overflow to another licensed firm.

The figures come from records you already keep. Outside London, section 56(2) of the 1976 Act requires a record of every booking before the journey starts, which gives you jobs and times, and drivers' log-on times give you driver hours. The numbers to track in a taxi firm covers how to collect them.

Should you add drivers or cars?

Add drivers first if you can. A driver who brings a licensed car costs you little up front, while a firm-owned car ties up money whether it's busy or not.

Line up the driver before you buy the car. Driver commission or weekly rent covers how each pay model treats idle time, choosing vehicles for a taxi fleet covers which cars councils will license, and starting a taxi company without owning cars covers the driver-owned model.

What does adding a car involve in licensing and insurance?

A licensed driver, a licensed vehicle, insurance, and a check that all three match your operator licence. Outside London, the operator, the driver and the vehicle must all be licensed by the same council.

1. The driver. A private hire driver licence from your council. Applicants need an enhanced DBS check, which costs £41 from 5 October 2026, and councils add their own tests. Gloucester City Council charges £289 for a new 3-year driver licence.
2. The vehicle. A private hire vehicle licence under section 48 of the 1976 Act, for no more than a year at a time. The council must be satisfied the car is suitable, safe and comfortable, and it can't refuse a licence just to limit the number of private hire vehicles. Gloucester charges £222 a year for a vehicle licence and Colchester £350.
3. Insurance. Section 48 also requires insurance in force for the car's use before the council licenses it. Check the policy covers hire and reward, and diary its renewal date.
4. Your operator licence. Some councils charge operators by fleet size. In Gloucester, the 5-year fee rises from £2,909 for 4 to 10 vehicles to £4,692 for 11 to 30. Read your conditions for when you must report a bigger fleet.
5. Your records. Add the driver and the car to your booking system, so every job shows who drove and in which vehicle.

Hackney carriages work differently. Section 16 of the Transport Act 1985 lets a council cap the number of hackney carriage licences if it's satisfied there's no significant unmet demand, so a new hackney plate may not be available at all. Ask your council's licensing team.

How can you test demand before you commit to a car?

Add hours before you add cars. Ask existing drivers whether they'd move a shift to your short hours, take on a part-time driver for Friday and Saturday evenings, or agree with a licensed operator nearby to take your overflow. Run it for 4 weeks and keep the tally of jobs turned away going.

If the tally drops close to zero and the extra hours stay busy, you've found real demand, and a full-time car is the next step. If the extra driver sits idle, you've saved yourself the cost of a car.

Pre-booked work helps too, because you can plan it around the cars you have. Account work and airport runs are the usual candidates, and how to get corporate taxi clients covers winning the first kind.

When is adding cars the wrong answer?

When the jobs are being lost before they reach a driver. If calls ring out while drivers are free, more cars won't help, and the fix is the phones. Check your call log against what your drivers were doing at the same hours, using missed calls in a taxi office as a guide.

Dispatch AI is booking and dispatch software for taxi and private hire firms. It answers your phone, WhatsApp, texts and emails, books the jobs at your prices and sends them to your drivers on your own app.

Adding cars is also the wrong answer when your drivers already sit quiet for long stretches. A new car spreads the same jobs thinner, and drivers earning less leave. Fill the quiet hours first: keeping drivers busy in quiet hours covers the work that does it. For the bigger picture, read how to grow a taxi firm from 5 to 20 cars.