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Window Restrictors | Child Safety Catches & Locks for uPVC Windows | Fast UK Delivery
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Enhance safety and ventilation in your home with our reliable uPVC window restrictors—ideal for families, landlords, and commercial properties alike. These devices limit window openings, typically to around 100 mm, reducing fall risks while still allowing airflow.
Why Choose Our Window Restrictors:
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Child and Vulnerable Adult Safety
Restrictors prevent windows from opening fully, significantly lowering fall hazards for children and vulnerable individuals. -
Balanced Security & Ventilation
Provides airflow while maintaining safety and adding a secondary barrier against unauthorised access. -
Multiple Styles & Mechanisms
Choose from:-
Key-lockable restrictors for fire escape compliance
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Cable, fixed, or push‑button models
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Concealed and face‑fix options
All tailored for diverse installations and safety needs.
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Built for Strength
Many models meet high standard requirements, resisting forces up to 34 stone (≈ 216 kg), with elite options like the Jackloc Titan reaching nearly 74 stone—making them exceptionally secure. -
Easy Installation
Most restrictors are DIY-friendly and fit uPVC, timber, and aluminium frames—perfect for retrofitting existing windows.
Ideal for:
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Childproofing bedrooms or play areas
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Meeting safety standards in schools, care homes, or lettings
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Preventing unwanted window access in ground-floor or high-rise windows
Not sure which restrictor fits your window? Contact our team for personal support.
Window Restrictors for Child Safety
Each year, thousands of children in the UK are injured in falls from windows. A window restrictor limits how far a window can open — typically to around 100mm — which is wide enough for ventilation but narrow enough to prevent a child from falling through.
Our range includes hook-style safety catches, cable restrictors with key locks, and fixed restrictors with key release. All are designed for uPVC windows and most can be fitted in minutes with just a screwdriver.
If you are a landlord, window restrictors may be required to meet health and safety regulations in rented and multi-occupancy properties, particularly on upper floor windows. Our key-locking cable restrictors are the most popular choice for rental compliance.
Types of Window Restrictors We Stock
Not sure which type of window restrictor you need? Here is a quick guide to the main styles:
Hook Safety Catches (Releasable)
A spring-loaded hook that restricts the window opening to approximately 100mm. Can be released by hand to allow full opening for cleaning or emergency exit. Fits into the euro groove channel on most uPVC windows. Available in left and right hand versions.
Cable Window Restrictors (Key-Locking)
A steel cable connecting the window sash to the frame, limiting the opening distance. Locked with a key so children cannot override it. Compatible with uPVC, timber and aluminium windows. The most popular option for landlords and rental properties.
Fixed Restrictors with Key Release
A rigid arm restrictor that limits the window to a fixed opening distance. Tested to British Standard 6375 and able to withstand forces over 1000N. Key-operated release for full opening when needed. Our most heavy-duty option.
Self-Adhesive Sliding Locks
A no-drill sliding lock that sticks to the window frame. Ideal for rented properties where drilling is not permitted. Quick and easy to fit with no tools required.
For more detail on choosing between these types, read our guide on how to choose the right window restrictor.
How to Fit a Window Restrictor
Most window restrictors can be fitted as a DIY job in under 10 minutes per window. The general steps are:
Position the restrictor on the window sash and frame, making sure the hook or cable will engage at the correct opening distance. Mark the screw holes with a pencil. Drill pilot holes if fitting to timber, or screw directly into the uPVC frame using the self-tapping screws provided. Attach both parts of the restrictor and test the opening and release mechanism.
For a step-by-step video walkthrough, read our fitting guide on uPVC window restrictor safety catches.
More Window Security Products
Window restrictors are just one part of a complete window security setup. For additional protection, browse our related collections:
Sash jammers — a simple bolt-style lock that prevents uPVC windows and doors from being forced open from the outside. Shop sash jammers
Window handles — if your window handle is worn or broken, replacing it improves both security and ease of use. Shop window handles
Window and door security — explore our full range including alarms, letterbox security and patio door locks. Browse all window and door security
