Window Security Locks and Devices UK¶

Your complete guide to window locks, restrictors, alarms, and reinforced glass for UK homes.

Types of Window Locks and Their Standards¶

Upgrading window locks is one of the most cost-effective security improvements. British Standard 7950 covers key-operated window locks - ERA Clicklock range starts at £12.99 per window. For PVCu windows, a telescopic locking handle (Mila Otter, £18.99) replaces standard handles. Casement windows benefit from hinged wedge locks (Yale, £9.99 each). ONS data shows that 23 % of burglars enter through a window. Fitting BS 7950 locks on all ground-floor windows can reduce risk by 40 % and unlock a 5 % insurance discount with providers like LV= and Direct Line.

Additional Window Security Devices¶

Window restrictors limit opening to 100 mm - ideal for ventilation with safety. ERA's Pneu-X restrictor (£7.99) fits most PVCu frames. Window alarms (Ring Alarm Window Sensor, £24.99) trigger your smart alarm system. Security film (3M Safety Film, £15 - £20 per roll) makes glass five times harder to break. For high-risk areas, laminated glass (from £120 per m2) or GrilleShield polycarbonate panels (£45 - £80 per panel) offer near-forced-entry resistance. The Home Office recommends that any window within 2 m of a door or drainpipe is treated as high risk.

Specifications and Comparison¶

Device	Application	Cost
BS 7950 key lock	All window types	£10 - £25
Telescopic handle	PVCu windows	£18.99
Window restrictor	Ventilation safety	£7.99 - £14.99
Security film	Glass reinforcement	£15 - £20 per roll

FAQ¶

Which British Standard applies to window locks?: BS 7950 is the standard for key-operated window locks in the UK.
Are window restrictors worth installing?: Yes - they allow safe ventilation and meet BS 8213-1 for child safety.
Do window locks reduce home insurance?: Yes - ground-floor window locks typically unlock a 5 % discount. For more information see our Letterbox Security and Protection UK.

Last updated: 2026-05-31.

External Resources¶

For further information consult authority guidelines at the National Security Inspectorate.