I built a brick building roughly the size of a garage, with having been targeted I went for a Steel door from Bradbury Security at Scunthorpe, they manufacture for the police, electricity substations etc & I was really impressed, the local scroats came tried and left, never been back, As for tamaso’s comment, if you have windows then have a steel grill made & securely fastened internally or take the window out, as for the roof I went for 20mm treated ply screwed to the roof trusses with 3 inch screws.
Yeah ok it cost me a fortune but a sleep soundly.
roller shutters .. the father in law has drilled & fitted anchor points at both ends of the door to prevent it from being crow bar’d up, personally go with the best security you can afford that way you’ll sleep sound and not have the worry of thinking what If…..
Cheers Mark