Most parents booking a Heathrow transfer assume the same child seat rules apply in a taxi as in their own car. They do not, and the gap between what the law permits and what is actually safe is where families get caught out — usually at a terminal kerb at midnight with a tired toddler and no seat in sight.
This guide covers what UK law genuinely requires in a licensed taxi or minicab, which seat suits your child, and what to tell your operator so the right one is fitted before your driver sets off rather than negotiated on arrival.
In your own car, a child needs a car seat until they are 12 or reach 135cm. In a licensed taxi or private hire vehicle, that requirement does not apply if no seat is available: a child aged 3 or over travels in the rear on the adult belt, and a child under 3 may travel in the rear without one. Legal, but not equivalent — an adult belt crosses a small child at the neck and stomach rather than the shoulder and hips.
A child seat has to be physically fitted before the driver leaves for you, so a request made an hour beforehand often cannot be met. Booking ahead also settles the vehicle size: two child seats and a family’s luggage rarely fit a saloon, and that is a decision made when the job is assigned, not at the kerb.
Modern i-Size seats are selected by height, and older seats by weight, so age on its own is not enough to pick the right one. An infant carrier, a harnessed toddler seat and a high-backed booster are three genuinely different pieces of equipment. Give the operator all three figures and let them match the seat.
Many families prefer their own seat, and most airlines carry one free in the hold. Tell your operator either way — a boxed car seat takes real boot space, and the driver will allow a few minutes at the kerb to fit it. Check it for cracks after it has been through baggage handling.
The harness should be snug enough that you cannot pinch a fold of webbing at the shoulder. The seat should not shift more than slightly at the belt path. A rear-facing seat must never go in a front seat with a live airbag. If something looks wrong, say so before you set off — it takes a moment to correct and no good driver would prefer you did not mention it.
Tell us your children’s ages, heights and weights when you book and the correct seats are fitted before your driver sets off, at no extra charge. Flight tracking is included on every arrival, so a delayed landing does not leave your family waiting. See our Heathrow transfer service, read our family airport transfer tips, or get your fixed fare.
UK law treats licensed taxis and minicabs differently from private cars. A child may legally travel in a licensed taxi or private hire vehicle without a child car seat: if they are 3 or over they must wear the adult seat belt in the rear, and children under 3 may travel in the rear without one. That is the legal minimum, not the safe option — a correctly fitted seat is always safer, so tell your operator your child’s age, height and weight when booking and ask for the seat to be fitted before pickup.
This page pulls together everything you need on Heathrow airport taxi with a child seat in one place — how it works, what to expect and the questions we are asked most — so you can decide and book with confidence. Prefer to talk it through? Call us any time on +44 (0) 1582 824631 for a fixed-fare quote.
In a private car, the rule is straightforward: children must use a child car seat until they are 12 years old or 135cm tall, whichever comes first. Licensed taxis and private hire vehicles are the exception to that rule, and it catches a lot of parents by surprise.
The exemption works like this. If a child car seat is not available in a licensed taxi or minicab, a child aged 3 or over may travel in the rear seat wearing the adult seat belt. A child under 3 may travel in the rear without a car seat and without a seat belt. Children should not travel in the front passenger seat without appropriate restraint.
It is worth being clear about why that exemption exists. It is there so families are never stranded — not because travelling without a seat is equally safe. An adult belt is designed around an adult body, and on a child it typically sits across the neck and the soft abdomen rather than the shoulder and hips. The exemption is a legal fallback, and booking a proper seat in advance is the option that actually protects your child.
Private cars: seat required until 12 years or 135cm
Licensed taxi or minicab: exempt if no seat is available
Aged 3+: must wear the adult seat belt in the rear
Under 3: may travel in the rear without a belt
Booking a seat in advance is always the safer choice
Seats are matched to height or weight rather than age alone, and modern i-Size (R129) seats are chosen by height while older R44/04 seats use weight groups. In practice, for an airport transfer, the operator needs three things from you: your child’s approximate age, their height, and their weight.
A newborn or small baby needs a rear-facing infant carrier. A toddler roughly from nine months to four years needs a forward or rear-facing seat with an integral harness. From about four upward, a high-backed booster positions the adult belt correctly across the child’s shoulder and hips. A backless booster cushion is the last stage before a child no longer needs one at all. If you are unsure which applies, give the operator the measurements and let them advise.
Say it at the point of booking, not in a message the night before. The seat has to be physically fitted into the vehicle before your driver sets off, and for arrivals it also means the right vehicle is allocated — a saloon with two child seats and four suitcases is not a workable combination, so the vehicle size and the seat requirement are decided together.
Give the number of children, each child’s age, height and weight, and whether you are bringing your own seat. Ask for written confirmation that the seat is included. Airport Move fits the correct infant, child or booster seat at no extra charge when it is requested at booking.
Plenty of families travel with their own seat, and it is a perfectly good option — you know its history, you know how it fits, and your child is already used to it. Most airlines carry child seats free of charge in the hold, though allowances vary, so check with yours before you fly.
Tell your operator if you are bringing one. It affects the luggage calculation, since a boxed or bagged car seat takes real boot space, and it tells the driver to allow a few extra minutes at the kerb for fitting. If your seat has been through the hold, give it a quick visual check for cracks or damage before fitting it.
Two minutes at the terminal is worth it. Check the harness sits snugly — you should not be able to pinch a fold of webbing at the shoulder. Check the seat itself does not shift more than a small amount side to side at the belt path. Check a rear-facing seat is never fitted in a front passenger seat with an active airbag.
If anything looks wrong, say so before you set off. A driver who has fitted hundreds of seats will sort it in a moment, and no reputable operator would rather you travelled unhappy than spend two minutes adjusting a harness.
A minicab is a licensed private hire vehicle, and it cannot be hailed on the street — every journey is booked in advance through a licensed operator, with the driver and vehicle separately licensed. That advance booking is precisely what makes child seats practical. A car you flag down cannot have a seat fitted for a child it did not know was coming, whereas a pre-booked minicab is matched to your family before it leaves for the airport.
No. Licensed taxis and private hire vehicles are exempt from the usual child car seat rules. A child aged 3 or over may travel in the rear wearing the adult seat belt, and a child under 3 may travel in the rear without one. A properly fitted seat is still considerably safer, so book one where you can.
Yes, and you should do it at the point of booking rather than later. The seat has to be fitted before the driver leaves, and your child’s age, height and weight determine which seat is correct and which vehicle is assigned.
Airport Move fits the correct infant, child or booster seat at no extra charge when it is requested at the time of booking. Always confirm this in writing, as policies differ between operators.
Age, height and weight for each child, plus how many children are travelling and whether you are bringing your own seat. Modern i-Size seats are selected by height, so age alone is not enough to pick the right one.
Yes. Tell the operator in advance so they can allow for the space it takes in the boot and a little extra time at the kerb for fitting. Check the seat for damage after it has travelled in the aircraft hold.
Children should travel in the rear where possible. A rear-facing child seat must never be fitted in a front passenger seat that has an active airbag, as an airbag deploying against a rear-facing seat can cause serious injury.
A rear-facing infant carrier suitable for their weight and height. Say the baby’s age in weeks or months at booking so the correct group of seat is fitted rather than a general toddler seat.
In a private car, children need a seat until 12 years old or 135cm tall. Taxis are exempt, but a high-backed booster positions the adult belt correctly across the shoulder and hips and is worth requesting for children in that range.
Often not in a saloon. Two child seats plus family luggage usually needs an MPV or larger vehicle. Give passenger numbers, seat requirements and case count at booking so the right vehicle is assigned rather than guessed.
With flight tracking your pickup moves to the actual landing time and the child seats stay fitted for your arrival. Confirm flight tracking is included when you book, particularly on long-haul flights with children.
This page is written and reviewed by the Airport Move operations team, a London-licensed private-hire operator based at 450 Bath Rd, near Heathrow. We arrange fixed-fare airport, station, cruise-port and door-to-door transfers across London and the UK every day. Need help? Call +44 (0) 1582 824631 or email booking@airportmove.co.uk.
Last updated: 8 September 2026
