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Looks like the glass is full width in which case, if the perp is ok with smashing glass to get in, it isn't going to make too much difference if it's single or double glazed.
I'm guessing there will be an accessible ground floor window just to the left of the door so if you are going to smash things, that's another option.
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Why worry about the leaded glass, relative to every other way to get into the house? If someone really wanted to get in, they would. The leaded glass, even only single pane, would be a real pain to get through. So long as the new locks can’t just be turned from the inside from a single broken pane, it’s all relatively secure.
If she’s worried. Just get an alarm.
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We got secondary "security" glass fitted as the outside layer when we were having our door refurbished. Yes you can still smash it in, but less easily than just leaded windows. Also, we didn't bother with expensive Banham locks for exactly that reason. I don't see any point in them unless you've got a solid door (not that your sister made that choice, just commenting on whoever did). Our ERA locks are more than enough to satisfy our insurers.
My sis lives in a maisonette in north London and has some stained glass in her front door (other flat has its own entrance). She's had some solid locks fitted but isn't sure about the stained glass from a security perspective. Would the thing to do here be get the glass put in some secondary glazing? Any firms that do that?
Edit ps someone made a mess with the plaster and it needed painting anyway !
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