What window restrictors do
A restrictor catches the opening sash after a short distance, so the window can be left open for ventilation without a gap large enough for a child to climb through or fall from. Most can be released with a button, a key or a sliding catch, so the window can be opened fully for cleaning or in an emergency.
Restrictors come as cable types, which use a short steel cable between sash and frame, and arm or hinge types, which are built into or fitted alongside the window mechanism. The right choice depends on the window design and how often the full opening is needed.
Child safety window restrictors
Child safety window restrictors are most often fitted in bedrooms and landings above ground level, and in rooms where furniture near the window could help a child climb up. Fitting them on every upstairs opener gives a consistent level of protection, rather than relying on remembering which window is safe to leave open.
A restrictor works alongside sensible room layout. Keep beds, chests and toy boxes away from windows where possible, and check that the release is out of a young child's reach or needs a key, while remaining easy for adults to operate.
Landlords, lets and HMOs
Landlords and managers of houses in multiple occupation often want restrictors on upstairs windows as part of keeping a property safe for tenants. Because tenants change, a restrictor that is simple to understand and clearly releasable avoids windows being forced or the device being removed.
Where a window is an escape route, any restrictor must be easy to release without a key so the opening can be used in an emergency. Check your own obligations with your local authority or letting guidance; at the survey, the windows can be reviewed room by room so the right type goes on the right opener.
Fitting restrictors to new and existing windows
Restrictors can be specified when new windows are ordered, so they are part of the hardware from the start. Many can also be retrofitted to existing uPVC and aluminium windows. The fixings must go into a solid part of the frame and sash, and the device has to suit the hinge and opening style of that window.
Fitting includes checking that the window closes and locks normally afterwards and that the release works smoothly. If a window is stiff, has dropped or has worn hinges, that is best dealt with at the same time; our window handle and hinge repairs page covers those faults.
Choosing the right restrictor
Consider who uses the room, whether the window is a fire escape route, how often it needs to open fully and how visible you want the device to be. Cable restrictors are discreet and easy to retrofit; integrated types sit neatly with the window hardware. A lockable release adds security where children could otherwise free it.
Fairway Window Systems Ltd offers a free home survey and written quote. Use the existing enquiry form to say how many windows you want restricted and whether they are new or existing. For replacement windows with restrictors built in, see our windows page.
Frequently asked questions
What is involved in fitting window restrictors?
Each opening window is checked, a suitable restrictor is fixed to solid parts of the frame and sash, and the window is tested to make sure it opens to the restricted gap, closes, locks and releases properly.
How long does it take to fit window restrictors?
It depends on the number of windows and the type chosen. Retrofitting cable restrictors to a few windows is usually a short job.
What affects the cost of window restrictors?
The number of windows, the restrictor type, whether it is lockable and whether any windows need adjusting before fitting.
Can window restrictors go on a fire escape window?
Yes, as long as the restrictor can be released easily without a key, so the window can open fully in an emergency.