Security for Replacement Windows, Shoot Bolt Locks, SAC Bolts

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Locking Systems:

Security Features on Replacement Window

The standard locks on most replacement windows and doors are espagnolette multi-point locks (including night vent position) on windows and a five point lock for doors.

Most companies will also offer additional options such as:

Shoot-bolt locks - combined with espagnolette locks - these locks give locking on three sides of opening
SAC bolt locking - when combined with espagnolette and shoot bolt locks SAC bolts give you locking points / secure points on all four sides of opening
Entry guard - a sort of "advanced" security chain - this feature allows you to partially open a door in order to confirm the identity of a caller
Hook and shoot locks - most often fitted to single doors this lock features special shoot bolts at both top and bottom of door sash plus "hook" or "claw" locks on the side

click here for a free brochureAsk your supplier for further information or specify on your quotation request that you would like to be quoted for some of the above products. 

Special Note - some suppliers will supply locks to a lesser standard than specified here. Others, however, may include better locks as standard. 

You must specify your "unique" requirements to all potential suppliers and most importantly - when comparing quotations - compare "like with like". 

Click here to seeAdditionally there are many other "comparable" locking systems. Security is one of the most important issues when purchasing replacement windows and doors. It is worth payingparticular attention to - especially when there are so many different alternatives.

In the UK there are various British Standards for locks - it's worth asking your supplier if they can conform to these. You may find your insurance company will charge reduced fees if you use better quality locks.

Our top recommendation for locking on PVCu windows would be to combine SAC bolt locking with espagnolette and shoot bolts for maximum security.

Glazing Methods:

Click here to seeWith PVCU (Vinyl) windows in particular you will often hear a lot of "arguments" in favour of using an internally beaded window - instead of an externally beaded window. 

Clearly, if the beads holding the glass are on the inside of the window it will be more difficult for a burglar to remove the glass and enter your home. You will often find "sales people" making quite a fuss over this issue and whilst it is relevant to realize that the types of locks used are perhaps more important. Also if a PVCu frame is fully reinforced it will be less likely to "spring open" if attacked with a jemmy/crowbar. 

To Simplify: it's not much use having an internally beading if the window "falls down" on some other areas.

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Special Note:  

Some suppliers of externally beaded windows will fit special glazing gaskets and double sided tape to the frame and sealed unit in order to improve on the security. Some will even claim security "as good as" internal beading.

British Standards for Window and Door Security

DOORS: Please Note that the reference to ‘SBD’ refers to the police Secured by Design project

BS: PAS 23-1: 1999
General performance requirements for door assemblies. Part 1, single leaf, external door assemblies (presently excluding annexes). An environmental performance standard for door sets, which certifies that a particular door set, is fit for purpose. The security element is basic and not sufficient for police and insurers purposes. The environmental protection element is relevant to the police requirement for PAS 24.

BS: PAS 24-1: 1999
Enhanced security performance requirements for door assemblies. Part 1 single leaf, external door assemblies. An attack test standard for door sets which certifies that a particular door, frame, lock and hardware set has withstood a series of physical tests based on common methods of burglary using defined sets of tools and attack time. This is the minimum police requirement for Secured by Design homes.

LPS 1175: Issue 4, 1998
Specification for testing and classifying the burglary resistance of building components, strong-points and security enclosures. This includes doors for commercial premises and higher risk domestic premises and is acceptable to the ABI and the Police. The standard has categories 1 -6; Cat.1 being simple attack tests and Cat.6 relevant to extreme attack risk. See note under General Security.

WINDOWS: Please Note that the reference to ‘SBD’ refers to the police Secured by Design project

BS: 7950
Specification for enhanced security performance of casements, tilt/turn windows for domestic applications. This is the standard required for all SBD windows to meet the security specifications for domestic premises. The following BS references are fit for purpose standards required to support BS:7950 certification for relevant SBD windows.

BS 4873: 1986
Specification for aluminium windows.

BS 7412:1991
Specification for plastic windows made from PVC-U extruded hollow profiles.

BS 644-1: 1989
Wood windows. Specification for factory assembled windows - various types.

Timber window accreditation scheme.

BS 6510: 1984
Specification for steel windows, sills, window boards & doors.

LPS 1175: Issue 4, 1998
Specification for testing and classifying the burglary resistance of building components, strong-points and security enclosures. This includes window security for higher risk premises.

Secured by Design is the UK Police flagship initiative supporting the principles of 'designing out crime' by use of effective crime prevention and security standards for a range of applications.

Secured by Design supports one of the Government’s key planning objectives - the creation of secure, quality places where people wish to live and work.


Whilst not a particular security issue - always ask your supplier if their windows have any special "easy escape" or "fire escape" features. Special hinges can be fitted to help with this - but these are not usually standard items and will add to the cost.

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