A window restrictor for babies becomes useful as soon as your child moves around on their own, at around 9 to 12 months, and stays useful until at least 6 years old. The most protective type limits the opening to about ten centimetres, locks with a key and is fitted out of reach. A simple handle lock is not enough: it protects the closed window, not the window left ajar for fresh air. This guide draws on French surveys of falls from windows and turns them into practical criteria for choosing one.
Why a window restrictor for babies: what the French surveys say
Falls from height involving children have been counted three times by the Institut de veille sanitaire (the former French public health surveillance institute), now Santé publique France, the national public health agency, together with Necker-Enfants malades hospital in Paris. In the Île-de-France region, between May and September 2005, 67 children under 15 fell from a window or balcony. Seven died and eight were left with lasting after-effects.
The 2013 survey, carried out over seven months in Île-de-France, Nord-Pas-de-Calais and Provence-Alpes-Côte d’Azur, recorded 76 children. Nine died, or 12%. The median age was 4, and 62% of the children were under 6. Seven victims in ten were boys.
The circumstances repeat from one survey to the next. In 2013, a piece of furniture stood under the opening window in 52% of the cases where this was recorded. In 67% of cases, an adult was in the same room. Half of the openings had no protection at all. Seven falls in ten happened between the first and second floor, from a median height of six metres.
In 2005, the Commission de la sécurité des consommateurs (the French consumer safety commission) estimated that around a hundred children fall from windows each year in France, with some fifteen deaths and as many children left with lifelong disabilities. It also noted that 75% of the accidents in the Paris region happened through a bedroom window, and 80% between 11am and 8pm.
Two lessons follow for parents. Having an adult nearby is not enough: an accident happens in a few seconds, often around mealtimes. And your child’s bedroom window, the one you open for fresh air, is the first to equip.
At what age should you fit a window restrictor?
As soon as your child moves around on their own and starts to climb, which means between 9 and 12 months for most children. The risk then peaks between 1 and 5, when curiosity and agility grow faster than awareness of danger. It does not disappear at 6: the 2013 survey includes children aged from 13 months to 14 years.
So the right time to equip your windows is the same as for the rest of the home: before the first moves, not after the first scare. Our guide to making your home safe room by room sets out the priorities. The moment your baby stands up, then the moment they climb on everything, mark two stages when the height they can reach suddenly changes.
Types of window restrictor and their limits
The devices on sale fall into a few families. The descriptions below follow the categories in the opinion issued by the Commission de la sécurité des consommateurs on 6 October 2005, supplemented by common practice.
The key-locking handle or handle lock
It holds the window in the closed position. It works as long as nobody opens it, but the protection disappears as soon as the window is left ajar for fresh air. The Commission pointed out exactly this limit: the open window remains unprotected. So it is an extra measure, not a complete solution.
The cable or chain restrictor
It links the opening sash to the frame and limits the opening to a few centimetres. The Commission classed it as a convenience product, unless it is padlocked or fitted with a lock. A restrictor without a key can indeed be released with one hand. The type to choose for a child locks with a key and is fitted high enough to stay out of reach.
The opening limiter arm
Fitted in the rebate, it is invisible when the window is closed and simple to install. It only works with a locking mechanism, again according to the same opinion. It suits inward-opening casement windows, the most common type in France.
The stop or restrictor for sliding windows
On a sliding window or patio door, a stop screwed or clamped onto the track limits how far the sash can travel. The Commission noted that no opening size had been set for these products at the time: check for yourself that the remaining gap does not exceed about ten centimetres.
The tilt-and-turn window
This is not an accessory but a type of window, which tilts open inwards from the top. The Commission presented it as the best technical protection, especially with a lockable handle. If you are replacing your windows, it is the safest choice for a child’s bedroom.
The window guard
Extendable guards and nets were judged inadequate. Nursery safety gates that conform to the EN 1930 standard, designed for stairs, only protect children up to 24 months and are not intended for a window reveal. Our article on the baby safety gate explains what this standard covers.
Which window restrictor for babies should you choose? The criteria that matter
- An opening limited to 10 cm at most. This is the figure the Commission de la sécurité des consommateurs used in its advice to parents. Beyond that, a young child’s head can get through.
- A key lock. A device that releases with a push or a clip will be undone by a 3-year-old. Keep the key somewhere every adult knows, out of reach.
- Fitted out of reach. The device goes at the top of the sash, not at handle height.
- Fitting suited to the material. On uPVC or aluminium, the Commission recommended having it fitted by a professional, so as not to drill into a reinforcement or weaken the profile.
- Full opening still possible for an adult. In a fire, the window must be able to open fully and quickly. A key-operated device allows this; a permanently fixed screw does not.
- Compatibility with your type of window. Casement, sliding, tilt-and-turn windows and French doors each call for a different product.
Adhesive or suction models, sold for rented homes, avoid drilling. How well they hold over time depends on the surface and the temperature, and none of the surveys cited assesses them. If you rent, ask your landlord for written permission to screw one in: the Commission even called for any tenancy clause banning such equipment to be declared void.
What matters as much as the window restrictor
A device does not replace the way the room is arranged. In both surveys, more than one child in two had used a piece of furniture to reach the opening. The rules below follow the Commission’s 2005 advice and the 2013 findings.
- No bed, chest of drawers, toy box or chair under a window or against a railing. A 2-year-old can move a stool on their own.
- Never leave a child alone in a room with an open window, even to answer the door.
- On a balcony, nothing that could be used as a step stool: plant pots, window boxes, storage tubs. Balconies accounted for 30% of falls in 2013, and 39% among children under 6.
- Block any gap of more than 10 cm between a railing and the window, with a rigid panel rather than a net.
- Air the bedroom when your child is not in it, then close the window before putting them to bed or letting them play.
A floor play area set up away from windows and radiators also keeps your child’s activity at a distance from openings. That is one of the uses of a Treelys play mat in a bedroom or living room.
Does a child understand the danger of a window?
Not for several years. Toddlers live in the moment and do not anticipate a fall. The Canadian reference fact sheets place a gradual awareness of danger from the age of 6, as our article on children’s awareness of danger explains. Explaining helps in the long run; protecting the window helps right now.
What do the regulations say?
In new homes in France, the Code de la construction et de l’habitation (the French building and housing code) requires a guard rail and protection up to 1 m. This rule covers windows less than 0.90 m above the floor, above ground level. Balcony railings must be at least 1 m high. These rules concern strength and height, not a young child opening the window, and they do not apply to older homes. Protection against opening remains up to families.
Falls are the leading cause of home accidents among young children, as the official data on everyday accidents shows. The Santé.fr fact sheet on home accidents (Santé.fr is the French public health information website), published on 11 July 2025, lists windows among the things to make safe before a child starts moving around.
Key points to remember
- Equip your windows before your child’s first moves, starting with their bedroom.
- Choose a device that limits the opening to 10 cm, locks with a key and is fitted out of reach; a key-locking handle on its own does not protect a window left ajar.
- Remove any furniture from under windows and from balconies: it is the most frequent factor in the surveys.
- Make sure an adult can still open the window fully in an emergency.
Sources
- Commission de la sécurité des consommateurs, “Avis relatif à la sécurité des fenêtres et des balcons”, 6 October 2005.
- Institut de veille sanitaire and Necker-Enfants malades hospital, “Épidémiologie des chutes accidentelles de grande hauteur d’enfants en Île-de-France entre mai et septembre 2005”, November 2006.
- Institut de veille sanitaire and Necker-Enfants malades hospital, “Les chutes accidentelles de grande hauteur d’enfants en Île-de-France, Nord-Pas-de-Calais et Provence-Alpes-Côte d’Azur”, survey from 15 March to 15 October 2013.
- Santé publique France, page “Investigations : défenestrations” (2005, 2006 and 2013 surveys), accessed 29 October 2026.
- Santé.fr, “Éviter les accidents domestiques des enfants”, 11 July 2025.
