The Royal Society for the Prevention of Accidents records an average of 4,000 window-related injuries to children under five in the UK each year, with hospital admissions peaking between May and September when windows are open more often. UK building regulations require new windows with sills below 1,100mm to restrict to a maximum 100mm opening, but millions of older homes have no restriction at all. The gap between what the regulations require and what is actually fitted in British homes is where the danger sits. LockLatch® was invented in South Africa, patented internationally (UK patent EP2989274, SA patent 2014/09494, USA patent 9,797,173), and has been used by UK parents to safely restrict bedroom windows for over a decade.
Why Do Children Fall From Windows?
Children under five lack the spatial awareness and upper body strength to recover once they lean against an open window. Furniture placed near windows, particularly beds, desks and toy boxes, gives children a climbing route to sill height. Fly screens and insect mesh provide a false sense of security because they offer no structural resistance to a child’s weight.
The pattern is consistent across NHS data. A toddler climbs onto furniture, reaches the window, leans against the opening or mesh, and falls. It happens in seconds. The peak months are June, July and August, when parents open bedroom windows overnight for cooling.
The same pattern affects pets. UK cats are at high risk of falling from upper-floor windows during the summer months, a condition vets call high-rise syndrome. The window-safety solution that protects a toddler is the same one that protects an indoor cat, which matters in households with both.
What Do UK Building Regulations Actually Require?
Approved Document K of the Building Regulations 2010 requires windows in dwellings where the sill is below 1,100mm to have an opening restrictor that limits the gap to 100mm. This applies to new builds and window replacements, not to existing unreplaced windows.
That means any home built before the regulation came into force, and any home where the original windows have not been replaced, may have no restriction at all. A pre-war terraced house with original sash windows, for example, has no built-in opening restriction.
The 100mm limit is significant. A child’s head requires roughly 95mm to pass through an opening. The 100mm restriction provides a safety margin while still allowing limited ventilation.
Do Standard Window Restrictors Solve the Problem?
Cable restrictors and chain restrictors limit the opening distance. They prevent the window from exceeding a set gap. For child safety, they work. The window cannot open beyond the cable length.
The trade-off is ventilation. A cable restrictor set at 100mm allows very little airflow. On a hot summer night, 100mm of opening across a standard window provides minimal cooling. Parents are then back to the original dilemma: safety or comfort.
Cable restrictors also offer no adjustability or rigidity. The fixed cable length means they cannot be locked at a chosen width, and the cable itself provides no structural resistance. A child who leans against a cable-restricted window will feel the cable flex, which is safe from a fall perspective but provides no sense of firm closure.
How LockLatch® Addresses Both Safety and Ventilation
Both LockLatch® and MiniLatch® comply with the 100mm child safety requirement because of their footplate geometry. The footplates usually mount to the middle of the frame rather than the very edge, which reduces the effective opening by approximately 3 to 4 centimetres from the nominal range.
MiniLatch® has a nominal range of 4.5 to 8 centimetres. After the footplate reduction, the effective opening sits well within the 100mm regulatory threshold. This makes MiniLatch® ideal for children’s bedrooms and nurseries where the 100mm limit must be respected.
LockLatch® has a nominal range of 9 to 17 centimetres. At the lower settings, and after the footplate geometry reduction, the effective opening can also sit within the 100mm threshold. At higher settings it exceeds 100mm, making it suitable for rooms where child access is controlled and ventilation is the priority.
Both devices use a locking pin secured by a removable key. A child cannot release the mechanism. The rigid C304 rust-resistant stainless steel arm does not flex if a child leans against the window. This is the fundamental difference from a cable restrictor: rigidity.
Room by Room: Which Product Where?
Children’s bedrooms and nurseries where the child sleeps unsupervised: MiniLatch® at the narrowest setting. The gap stays under 100mm and provides steady overnight ventilation.
Living rooms, kitchens and other supervised spaces: LockLatch® at a wider setting for maximum airflow. An adult is present and can supervise.
Upper-floor windows where a fall risk exists: MiniLatch® regardless of room type. The priority is preventing any possibility of a child passing through the gap.
Ground-floor windows with no fall risk but a security concern: LockLatch® provides ventilation and added open-position security — better than an unrestricted open window, but not absolute. The standard UK insurance position still applies: when premises are unoccupied, all windows and doors should be closed and locked.
Battle-Hardened in South Africa, Refined for UK Homes
LockLatch® was invented in South Africa, where summer temperatures regularly exceed those of UK Augusts and where homeowners have used the same product to keep windows safely open for over twelve years. The engineering that has been proven against South African conditions is the engineering inside the window restrictor in a UK nursery. The product family grew organically from real customer feedback. LockLatch® came first, designed for the standard adult-sized window or door gap of 9 to 17 centimetres. Dog owners then started asking whether their pet could fit through. The honest answer was that it depended on how big the dog was. PetLatch® was developed for that exact use case — a wider 14.5 to 23 centimetre gap that lets a medium or large dog come and go through a door. Then a friend in Durban mentioned a vervet monkey problem and asked for a shorter version that would let air in but keep monkeys out. That became MonkeyLatch, later renamed MiniLatch® (4.5 to 8 centimetres) once UK and international orders started arriving for child safety, cat safety and cooler-weather ventilation. Three products, one engineering platform, a full range of gap widths.
Installation
Four small holes are drilled into the frame, then secured using either a screwdriver or a rivet gun depending on the frame type. One-way security screws for wood and steel frames, pop rivets for uPVC and aluminium. The process takes about 15 minutes per window.
Both products fit any window or door whatever the frame is made from and whichever way it opens. A parent can fit every window in a three-bedroom house in a single afternoon. No tradesman is required, which matters more than it sounds — letting an unfamiliar person into your home introduces its own security risk on a security-related fitting.
If the product is ever removed, holes can be covered with rubber grommets or filled with wood filler or silicone. Both products carry a lifetime guarantee and are made from C304 rust-resistant stainless steel requiring minimal maintenance.
Worldwide Delivery
LockLatch® and MiniLatch® ship worldwide from distribution centres in the UK and South Africa. The UK distribution centre is in Penley, near Wrexham, with delivery across England, Scotland, Wales and Northern Ireland typically taking two to four working days via Royal Mail or courier. International orders ship via Royal Mail and international couriers — customers in Europe, North America, Australia, New Zealand and the rest of the world receive the same product, the same lifetime guarantee and the same C304 rust-resistant stainless steel construction.
Shop LockLatch® now and fit child window fall prevention before the warm weather arrives.
