-
If the door has the usual Euro groove around the edge of the frame, you could fit one of these to the top of the door and onto the frame to stop it opening too far and damaging the hinges against the brickwork.
https://www.screwfix.com/p/mila-door-restrictor-satin-stainless-steel-100mm/5325P
However, I wouldn't leave a door open expecting it to stay put with one of those ^. If a gust takes the door, they aren't strong enough to stop it at the end of its travel as theres lots of leverage on the restrictor. Cue snapped hinges or a bent door.
If it's going to be left wide open, or shut, a (450mm) stainless Steel cabin hook on the wall and the staple installed onto the bottom of the door works well.
150mm sort of size ends up with a load of leverage on it, if someone (or wind) closes the door.
Any suggestions on how to hold my UPVC back door open. It opens outwards and there's a step so nothing attached to the floor will work I don't think.