MAX6MUM Lockable Window Restrictors

Lets face it, kids are curious. From the moment they learn to crawl they try anything and everything that catches their attention. Unfortunately with total disregard to safety. Its enough to drive a parent crazy (we know – we’re parents too!).  You do all you can to babyproof your home, however, there often lies a forgotten risk – an easily opened or ajar window. With the MAX6MUM Lockable Window Restrictor you can feel at ease knowing that your little ones are protected while keeping the flexibility to fully open your window if you want (or need) to!


Buy Now

Contact us for bulk orders

Every day children under the age of 15 are injured falling from windows. No matter how hard you try, it is almost impossible to watch them 24/7. Even if you do keep a close eye on them, you cannot guarantee that family members, friends or babysitters will do the same.

Luckily, there is a very simple, affordable and effective solution to the danger of window related accidenst – the MAX6MUM Lockable Window Restrictor. The window restrictor limits the opening of a window to no more than 100mm (about 4 inches) – enough to enable air to circulate throughout your home, but not enough for someone to fit through. The opening width can be decreased if necessary during installation by positioning the fixing points further apart from each other.

The restrictor can be fitted to any profile and style of window or doors – including aluminum, wood, metal & uPVC profiles. It is extremely easy to install yourself, and comes with all the parts necessary, including self-drilling screws. A step-by-step guide of how to fit the window restrictor is also provided here, meaning you can easily fit the restrictor in just a couple of minutes.

The window restrictor cable is locked into place with a key so that if need be, the window or door can be fully opened. This is simply done with a half-turn of the key. As the restrictor can be unlocked, it can also be used on fire escape windows, providing that the key is kept within easy reach of the window.


Some window restrictors in the industry claim that the cable can withstand forces over 500kg (or approximately  1000 pounds). Do not be fooled into thinking that this will help keep your loved ones safe. Although the cable can take great weights, it does not mean anything. It is the strength of the locking system which the cable locks into which stops the window from opening! The MAX6MUM Window Restrictor can withstand over 100kg (220 lbs) of force once the cable is locked into the locking system, making it one of the strongest window restrictors available (the industry standard is around 50kg of force). This means that you can relax knowing that the window restrictor will stand up.



Another unique feature of the MAX6MUM Window Restrictor is that, for popular styles such as the white model, the plastic used on both the cable and locking system is MRSA resistant. MRSA is a antibiotic resistant bacteria that can cause serious illness. A special chemical has been added to our plastic, which kills the MRSA virus when touched. The window restrictor therefore not only stops your children from falling out of a window, but also helps prevent your child – and yourself – from catching the MRSA virus.

In addition to being a window safety device, the MAX6MUM Window Restrictor is also a crime deterrent – preventing criminals from using the window as an access point to the home, especially if the window is on the ground floor. As the restrictor cable is made from hardened steel, it is extremely difficult to cut. This means that, during the summer, you can leave your windows open to let fresh air in, and feel secure knowing that someone is not going to easily open the window and break into your home.


  • Fits to any window or door
  • No skill required
  • Exceeds the strength requirements of EN 16281
  • Can be used of fire escape windows providing the key is in easy reach
  • Comes with fitting instructions
  • 1 year mechanical guarantee


  1. You will first need to decide where on your window you want to put the restrictor. We suggest that you fit the window restrictor in the middle of the longest side opposite the hinges.
  2. Take the locking system (C) and remove the plastic cap. To remove the cap, hold both sides of the plastic cap, and press down on where the key goes in (C1). This will make the locking system pop out.
  3. Place the locking system on the window frame (1A) (it does not matter if the key hole is at the top or bottom). Mark the 2 screw holes on the window frame using a pencil.
  4. Using a drill or screwdriver, screw two self-drilling screws (A) into the locking system to secure it to the window.


  1. Take the steel cable (B) and place the knuckle end (shaped like a T) into the locking system already fixed to the window. Place the other end on the fixed window panel (2B) (making sure that the cable is not tight and has length for the window to open around 10cm – see diagrams 1 and 2), and pull the plastic cap away from the end of the cable (a bit of plastic preventing the cap from locking will fall out, throw this in the bin).
  2. Mark the 2 screw holes on the end of the cable using a pencil.
  3. Using a drill or screwdriver, screw two self-drilling screws (A) into the end of the cable to secure it to the panel.
  4. Once both parts are secure to the window, check to make sure the cable fits into the locking system. Take the key (D), place it into the locking system and make sure it locks and releases the cable.
  5. Lock the cable into the locking system and open the window. This should allow the window to open approximately 10cm.
  6. If everything works correctly, remove the cable from the locking system and attach the plastic cap by pressing it securely onto the locking system. On the end of the cable, attach the plastic cap.

How to Use

It recommended that you keep the window restrictor locked at all times to prevent children accidentally opening the window and falling out or a loved one opening a door they should not. The restrictor is designed so that it allows ventilation into a room without having the window/door fully wide open, which can be very dangerous. If you do require the window/door to open fully wide, use the key to unlock the restrictor, and remove the knuckle from the locking system. This will allow the window/door to operate normally. Remember to lock the restrictor afterwards, by placing the knuckle back into the locking system and locking it with the key.