Garden sheds, as they are away from the house, tend to be a weak point from the view of security as burglars can access them in relative secrecy. Also, as they contain valuable and easily disposable garden items, tools and furniture your valuables are particularly attractive. So the key is to ensure you take extra special care to ensure they are kept locked at all times.
This problem is usually worse during the hot summer evenings (which seems a long time away at the moment) where garden furniture and the barbecue is pulled out for a nice evening with your friends and, being in a relaxed mood, the garden shed or summerhouse gets left open. However the winter does present its own dangers as the dark nights make it easier for those thieves to operate. Even more so when the shed might not be looked into for weeks on end so you are not even aware of the loss of your valuables for quite a while.
This issue was also raised by Gloucestershire Police stressing the same issues. They confirmed that you should pay special attention to your sheds or your out buildings to deter opportunistic thieves. Their city's crime reduction design adviser (that's a bit of a mouthful), PC John Whitmarsh said that sheds not locked up attract thieves looking for valuable mountain bikes, power tools and other high value items.
He said that you should check for weak points in your shed's defences and that you could make it more secure by the addition of metal grilles over the shed's window. Add reinforced hinges and strong locks as well as investing in a garden shed alarm. You can also aid security by having a gravel path as this will make it hard for thieves to get to your shed without making some noise. Thieves hate noise which draws attention to themselves.
1st Choice Leisure Buildings, garden sheds specialists, says that you can help make your shed more secure by replacing one screw out of each hinge with a nut and bolt which would then bolt through on the inside of the shed. This will make it, more or less, impossible to obtain access by just unscrewing the shed door. Boost the door's defence with a fold over type hasp and staple, also ensuring that at least one of the screws is replaced with a nut and bolt. As the hasp folds over the staple on the shed's door it will cover the screws keeping them safe from being undone. With the addition of a strong padlock this will ensure that your shed is not an easy target.
If possible try to buy a garden shed with no windows, unless they are essential. A shed just used for storage does not really need a window anyway and you will find that when the door is open there is more than enough light to see what you need.
You could consider the SafeStore range of security sheds made from 1.2m thick steel. This is about 4 times thicker than the average metal garden shed. They come complete with a steel base floor so are the nearest thing you can get to Fort Knox. Well at least making it hard for thieves. Whatever you do ensure that you make life hard for these thieves. YOU have had to work hard so do not let them get the benefit of your hard work.