Child car seats: Choosing a child car seat The law on using child car seats

A child dressed up as a policeman

Following the law on child car seats will help to keep your little ones safe

The law states that you must use an appropriate child restraining system (child car seat) when carrying all children up to 135cm/4ft 5in (approximately 10 years for boys, 12 years for girls).  

However, safety experts recommend you use a child car seat for all children under 150cm.

For those over 36kg (5st 10lb) but under 150cm, our advice is to go by height, not weight. 

Our child car seat reviews will help you choose the best seat for your child's weight.

What is an appropriate child restraint?

An appropriate child restraint is one that:

  • conforms to the United Nations standard, ECE Regulation 44/03 or ECE 44/04 (this is marked on a label on the seat)
  • is suitable for the child's weight and size
  • is correctly fitted according to the manufacturer's instructions.

Child car seat law by age

Child car seat law by age
Age of childFront seatRear seatWho is responsible?
Child up to three years oldCorrect child restraint must be used.Correct child restraint must be used.

If a restraint is not available in a licensed taxi/private hire vehicle, the child may travel unrestrained.
Child from third birthday up to 135cms in height (approx 4' 5"), or 12th birthday, whichever they reach firstCorrect child restraint must be used.Where seat belts are fitted, the correct child restraint must be used. The child must use the adult belt if the correct child restraint is not available as follows:

- In a licensed taxi or private hire vehicle
- For a short distance in an unexpected necessity
- Two occupied child restraints prevent the fitting of a third

A child three years old and over may travel unrestrained in the rear seat of a vehicle if seat belts are not fitted in the rear.
Child over 135cm (approx 4' 5") in height or 12 or 13 years oldSeat belt must be worn if available.Seat belt must be worn if available.Driver
Passengers aged 14 years old and overSeat belt must be worn if available.Seat belt must be worn if available.Passenger


Exceptions to the child car seat law

There are a number of exceptions to the law.

In taxis 

Children under three can travel without a child car seat or seat belt on the back seat. Children over three can travel using an adult seat belt.        

Unexpected but necessary journeys over a short distance

Where an appropriate child car seat is not available, a child over three years old can use the adult seat belt for an unexpected but necessary journey over a short distance. This doesn’t apply to a regular school run or planned journey.

You must not take children under three in a vehicle without a seat belt or the correct child car seat (except in the back seat of a taxi or minicab).

No room for a third child seat in the back

If there’s no room for a third child seat in the back seat (where two occupied child car seats in the rear prevent the fitting of a third child safety seat) a third child under the age of three can’t travel unless they are in the front seat with the correct child seat.

Children over three years can either use the front seat with the correct child seat or sit in the back using an adult belt.

Penalties for ignoring the law on using child car seats

The consequences of ignoring the legal requirements could be expensive (at best) or fatal (at worst). Police are able to administer an on-the-spot fine of £30, or £500 if the case is referred to court. 

Remember, it's the driver of the vehicle's responsibility to ensure all passengers are safely strapped in. If you're the driver, always check. 

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