Child seats and family car hire in Spain

Renting with kids in Spain adds exactly three questions to the usual ones: what the law requires, where the child seat comes from, and which car actually swallows a family's luggage. All three have clear answers.

What does Spanish law require for children in cars?

The rule first, in plain terms: children shorter than 135 cm must travel in a child restraint system appropriate to their size and weight, and as a rule in the rear seats. The front seat is only allowed in narrow exceptions — for instance when the rear seats are already occupied by other children in child seats, or when the car has no rear seats. A rear-facing infant seat on the front passenger seat requires the airbag to be deactivated. Enforcement is taken seriously, and an unrestrained child is one of the few offences where police can immobilise the car on the spot — so treat this as non-negotiable rather than a technicality. For children over 135 cm the adult belt is legally enough, though a booster is still recommended until they are noticeably taller.

Seats come in the sizes you know from home: infant carriers for babies, combination seats for toddlers, and booster seats (with or without back) for school-age kids. Modern European standards apply in Spain exactly as elsewhere in the EU, and ISOFIX anchors are standard across recent rental fleets, so a seat that fits your car at home will generally fit a rental here.

Should you book a seat from the supplier or bring your own?

Option one: book the seat from the rental company. Do it at the moment you book the car, not at the desk — airport branches run out of specific sizes on busy days, and a toddler seat is not something you improvise. Expect a per-day fee, often with a cap for longer rentals; check the exact terms in the booking flow. Two practical realities worth knowing: staff at many desks are not allowed to install the seat for liability reasons, so you fit it yourself; and quality varies, so give the seat a thirty-second inspection — straps, buckle, shell — before strapping your child in, and ask to swap it if something looks tired.

Option two: bring your own. Most airlines carry a child seat and a folded buggy free or cheaply as family equipment — check your airline's current policy. Your own seat is a known quantity: you know its history, your child accepts it, and you can install it in your sleep. The cost is hauling it through two airports. For a two-week stay the maths usually favours bringing your own; for a three-day city break the supplier's seat wins on convenience.

Which rental car class actually fits a family?

Now the car itself. The binding constraint for families is almost never seats — it is the boot, and specifically the buggy. A folded stroller plus two suitcases defeats most economy hatchbacks. With one small child and cabin luggage, a compact works. With two children, a buggy and normal holiday luggage, book an estate or a compact SUV and stop fighting physics. Three or more kids, or travelling with grandparents, points to a 7-seater van — remembering that with all seven seats in use the boot of most vans shrinks dramatically, so count bags honestly.

What is different about driving with kids in Andalusia?

A few Andalusia-specific notes. Cars parked in the summer sun get brutally hot inside: touch the buckle and the seat surface before loading a child, and throw a towel over dark seats when you park. Plan mountain drives — Ronda, the white villages — around naps and winding roads if your kids get car-sick. And since the smart way to visit old towns is parking on the edge and walking in, factor the buggy into every stop: a light folding stroller earns its keep here.

Which booking details and mistakes trip families up?

One booking subtlety: a reserved child seat is a category request, not a specific model, so reconfirm infant seats a few days before pickup — a quick email is enough — and build a plan B into your airport timing if your child is under one.

Mistakes to avoid: turning up without a reservation and hoping the desk has a seat in the right size; holding a child on a lap "just for the short transfer" — this is precisely the ride where paperwork-checking and accidents happen; and choosing a seat one size too big so it lasts the trip. If in doubt about current rules or sizes, the DGT's guidance is the reference — and your child's height, not age, is what decides.