Child Seats and Extras for Rental Cars in Portugal

Portugal's child-seat law

• Children under 135 cm tall and under 12 years must travel in a certified restraint suited to their size and weight.
• Children under 3 must use a child restraint system and may not travel in a car without one; in practice this means a rear-facing or forward-facing seat.
• Under-3s in a rear-facing seat in the front are only allowed if the passenger airbag is deactivated.
• Rear seats are required for younger children where the car has them.
• Fines apply to the driver, and an improperly restrained child can also affect an insurance claim after an incident.

These rules apply to rental cars exactly as they do to private cars.

Rent a seat or bring your own?

Renting the seat

• Nothing to carry through the airport.
• Charged per day, usually with a maximum (often around a week's worth), so a two-week trip is not double a one-week trip.
• You get "a" seat of the right category, not a chosen brand; condition and cleanliness vary, and fitment is your responsibility.
• Reserve it in advance — stock is limited, especially infant seats in summer.

Bringing your own

• Most airlines carry a child seat and/or a folding buggy free, in addition to normal baggage.
• You know the model, its history, and how to fit it.
• Cheaper across a longer trip, and no risk of the branch being out of stock.
• Downside is lugging it through transfers; a travel-friendly or backless booster is easiest.

Other common extras

• Additional driver: usually a per-day fee; sometimes free for a spouse/partner on certain rates or with certain memberships. Everyone who drives must be on the contract or the insurance is void for them.
• Young-driver / senior surcharges: drivers under about 25 (sometimes 21) and occasionally over 70–75 pay a daily surcharge that cannot be waived.
• GPS unit: rarely worth it — a phone with offline maps does the same job. Decline unless you have no data plan.
• Toll transponder (Via Verde): often a small daily fee plus the tolls; see toll roads for rental cars.
• Roof box / ski equipment / snow chains: seasonal and region-specific (Serra da Estrela); reserve ahead.
• Excess-reduction cover: a big-ticket "extra" covered separately in insurance explained.

How extras are priced

Most extras are quoted per day, and several of them stack, so a cheap base rate with an extra driver, a child seat, GPS and a transponder can easily double at the counter. Add the extras you actually need when you book so the real total is visible while you are still comparing offers, rather than discovering it at pickup.

At the counter

• Check that only the extras you agreed to are on the contract before you sign — unrequested cover and seats are a common add.
• Confirm the per-day caps for anything long-term.
• If you pre-paid an extra online, have that confirmation ready so you are not charged twice.