We have had our single storey extension vaulted and put in velux windows. Our builder told us they are very safe and when I looked them up it said burglar safe etc. However we can’t work out how to lock them? I can from a first floor window push them open from the outside, is that normal?! I thought they would be locked when they were closed? Or do we need to buy the extra lock for this? I have spent a long time looking on google and watching videos which all say lock it by closing it. I am not sure if we are not doing something incorrect or that is just how they are!