Carrying a child on an e-bike is one of the few things that genuinely changes what a family can do without a car. It is also the area where we get the most nervous questions in the shop, and where the law is less complicated than people expect. If you are looking at a child seat for an e-bike in the UK, here is what is actually required, what is only recommended, and what nobody warns you about until the first wet Monday.
What the law actually says
There is one hard rule, and it is short. The Highway Code, Rule 68, states: "You MUST NOT carry a passenger unless your cycle has been built or adapted to carry one." In the Highway Code, MUST NOT means a legal requirement rather than advice.
That is the whole of it. There is no licence, no registration and no minimum passenger age set out for cycles. What the rule does mean in practice is that the bike has to be genuinely designed or properly fitted out for the job — a correctly mounted child seat on a rack rated to carry it, or a cargo bike built for passengers. Sitting a child on a crossbar or a standard rack is not adaptation.
Two further points that catch people out:
- The rider must be 14 or over. GOV.UK is explicit: "You can ride an electric bike if you're 14 or over." That applies to whoever is pedalling, not to the passenger. A younger child can legally be carried by an adult rider.
- Helmets are not a legal requirement in the UK, for adults or children. Rule 59 says you "should wear a cycle helmet that conforms to current regulations, is the correct size and securely fastened". We would not carry a child without one, but it is advice, not law.
Lights are law. Rule 60: at night your cycle "MUST have white front and red rear lights lit", plus a red rear reflector and amber pedal reflectors on anything made after 1 October 1985. With a child seat fitted, check the seat is not blocking your rear light — it very often is.
The standard that covers child seats
Child bike seats sold in the UK are made to BS EN 14344:2022, "Child care articles. Child seats for cycles. Safety requirements and test methods", published on 31 August 2022. It covers seats mounted on both ordinary cycles and electrically assisted pedal cycles.
Two details in its scope matter when you are shopping:
- It sets requirements for carrying children weighing between 9 kg and 22 kg. Seats built for older, heavier children sit outside that weight band, so with those you are relying on the manufacturer's own stated limits — read them rather than assuming.
- The child must be capable of sitting unaided. That, rather than a birthday, is the real test of whether a child is ready for a rear seat.
Which seat for which child
| Seat | Age | Weight limit | Fitting | Price |
|---|---|---|---|---|
| Urban Iki TA-KE rear seat | 9 months to 6 years | 22 kg / 110 cm | Pannier rack mount, 5-point harness | £89.99 |
| Urban Iki Junior seat | 5 to 10 years | 35 kg | Carrier mount, folding backrest, hip belt | £79.99 |
| Family Pack (caboose and footrests) | Older children and adults | Set by the bike | Porto L and Porto S longtails only | £175 |
The TA-KE uses a twist-and-lock mounting system that comes off in seconds, which matters more than it sounds: a seat that is a nuisance to remove stays on the bike all week, including on the days you are riding alone. The Junior folds its backrest down instead, for the same reason.
Rear seat, or a longtail?
A rack-mounted seat on a normal e-bike is the cheaper route and it works well for one child. Check the rack's stated load rating before you buy the seat — the seat's limit is meaningless if the rack underneath it is rated lower.
A longtail cargo bike is the other answer. The Porto L was built with the passenger deck as part of the frame rather than bolted to the back of a commuter bike, which is why it takes the caboose rail and footrests of the Family Pack, and why two children or one adult passenger is a realistic proposition on it. It costs considerably more than a seat, and it is a bigger thing to store.
Our honest summary: one small child, a few miles, occasional use — a rear seat on the bike you already want. Two children, a daily school run, shopping on the way home — a longtail, or you will spend a year wishing you had bought one.
The practicalities nobody mentions
- Helmet shape matters more than helmet price. A child in a rear seat has a headrest behind them, and a helmet with a rounded, protruding back pushes their head forward. The Bob+ kids helmet has a flat rear shell specifically for this, and a toddler uni-size fit of 46 to 52 cm.
- Your range will drop. A child plus a seat can easily be 20 to 25 kg, and weight is one of the biggest influences on how far a battery goes. Plan for a meaningful reduction on the manufacturer's figures — we set out what really moves the number in our guide to e-bike range.
- Loading is the risky moment. Most wobbles happen standing still. Use a proper kickstand, hold the bars, and get the child in and buckled before you move anything else.
- They get colder than you do. You are working; they are sitting still in the wind. Dress a passenger for a stationary child in that weather, not for a cyclist.
- Check the harness every single ride. Straps loosen. It takes five seconds.
- Park differently. A bike with a child seat is top-heavy and falls over more easily when leaned against something. Anywhere you would not leave a shopping trolley on a slope, do not leave this.
Quick answers
Is it legal to carry a child on an e-bike in the UK?
Yes, provided the bike has been built or adapted to carry a passenger — Highway Code Rule 68. A correctly fitted child seat on a rack rated for it, or a cargo bike designed for passengers, meets that.
What age can a child go in a rear bike seat?
The standard's test is that the child can sit unaided, and it covers children from 9 kg. Seat manufacturers translate that into an age from around 9 months, but the sitting test is the one that matters.
Does my child legally need a helmet?
No. Cycle helmets are not a legal requirement in the UK at any age. The Highway Code says you should wear one that fits and is fastened, and we would not carry a child without one.
Can a 12-year-old ride an e-bike to school?
No. The minimum age to ride an electric bike in Great Britain is 14. They can be carried as a passenger on a suitable bike before then.
Do I need insurance to carry a child on an e-bike?
Not by law — an EAPC does not need to be registered, taxed or insured. Some riders choose cycle insurance anyway; that is a personal decision, not a legal requirement.
Come and try it loaded
A bike with a child in the back handles differently from the same bike empty, and twenty minutes of riding tells you more than any specification. Our dealers can fit a rear seat to the bike you are considering, or let you ride a Porto L with the caboose fitted, before you spend anything. Bring the child — they are the ones who have to sit in it.
