Windows, Doors and Patio Doors Security Features

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Please note: Most of the answers we feature here are from 1999 - early 2002. We endeavour to keep all links etc up to date, however if you spot any errors please let our webmaster know at It should also be noted that some replies may change in light of changes to legislation especially with regards to Planning Permission and Building Regulations. To submit a new question or to query an existing question visit

Question submitted by Marcus

Some suppliers say that internal glazing is more secure since there is no beading on the outside. However other suppliers say that external beading is more secure because the fitter will push the glass against the beading from the inside which effectively locks the beading onto place. One supplier says that it is possible to simply "kick" out internally fitted glass panels. They also say that they are more prone to leaking since during wind loading, the flex of the glass is being pressed against beading rather than a moulded recess. I have contacted my insurance company and they have no preference. What is the truth? Which is more secure?

This question answered by the Conservatories Online editorial team - There are "elements" of "truth" in both "arguments".

It is difficult to argue against internal beading being the more secure of the two glazing methods and on most occasions we would favour this option.

However it is also true that some externally beaded systems (especially when combined with a double-sided security tape) are just about as secure.

It is also true that an externally beaded window is less prone to "leaks" through the beads as there is effectively a PVCu upstand on the inside of the window which any water would have to rise above before showing on inside. However leaks of this type are very rare and only happen in the most extreme of conditions (for instance if you had a coastal property or a property on the top of a hill with little or no protection.) In any case no matter what method of glazing is used your supplier should be guaranteeing against leaks. (The PVCu has drainage channels installed at time of manufacture to cope with this).

With regards to the glass panels being easy to "knock out" - its more likely the glass would break prior to being "knocked out" of the retaining beads.

We suggest make your choice based on the caliber of the company and your belief that they will be around to honor their guarantees in the future. Most companies (including the not so great ones) offer perfectly good products with optional extras such as Pilkington K Glass and better security locking. Base the majority of your "decision" on this aspect of the buying equation.

Unfortunately its often the case that the more you investigate a product and the more opinions you get - the more confused you will be. We appreciate we may not have given you the definitive answer you have expected - but hopefully this is some help.

Question submitted by Isabel 

Having just been burgled while on holiday (through a glass kitchen window that faces onto the garden where we hope to add a sunroom) I would be interested to know what your recommendations are for making windows as secure as possible. Thank you.

This Question answered by Tina Dunlop @ Almost Impartial Guide - You are correct security is a big issue. As each of the different materials are often glazed in different ways its difficult to give any specific advise.

Basically I would advise you to go for multipoint locking - combined if possible with shoot bolts. This is both for windows and the doors. One "brand name" often used in PVCu is SAC bolts - more suppliers now feature these type of locks and they are worthwhile having. Also with PVCu its best if you can get it to go for an internally glazed window as opposed to an externally glazed window. With hardwood you can often get locks for the doors made to various British Standards - most notably 5 and 6 Lever locks.



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