How to pick up right door dimension when ordering new doors

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I know could sound a very stupid question but I have removed my old door and would like to order new ones.

I have the structure opening dimension at the moment and don't trust the old door as it ms like they were customized in size.

For instance, what would be the difference between structure opening and door size?

And what about if I pick up a door of 762mm what would be structure opening?

Thanks
 
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762mm fits a frame up to around 770 or down to around 750.
Depends on the door make up and manufacturers spec .
 
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Don’t understand question, you already have door frame?

Nope, I have to buy everything. I only have a structure opening on the internal walls. Need to understand if the frame has a standard size and how much and then select door size which could suite inside.
 
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Frames come in a number of standard sizes with doors to match, just pick sizes best suited to your opening and required use.
 
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Frames come in a number of standard sizes with doors to match, just pick sizes best suited to your opening and required use.

yeah, I think I figured out myself. Frame is 30mm each side. Will then calculate what best suite leaving space for packers etc etc
 
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