If you live in a postcode area with a high crime rate it's worth investing in a good security system. Most insurers will offer you a discount if you have done this - although check with your insurer first as many companies insist that the installation of alarms is carried out by companies registered with the National Approval Council for Security Systems. The Association of British Insurers recommends fitting outside doors with deadlocks which conform to BS3621. These doors can only be opened with a key. Inside locks and bolts are also a good idea, although remember they are only as strong as the door or the door frame, so check for weak or rotten wood.
Patio doors are particularly vulnerable.
Glass panes can easily be removed and sliding doors can be lifted of their tracks. Fit them with extra security locks. Accessible windows, those on the ground floor or near drain pipes and walls, should be fitted with key locks. Remember, most burglars enter through windows. Joining a neighbourhood watch scheme would also lower your premium.