How thick for a door jamb?

[Doggit]

Okay, sounds good; you should be able to get away with 15mm, possibly 10, but that'd be pushing it

 

[big-all]

Oh I'll just buy some stripwood or something. Basically I have two doors available, one 700mm wide, the other 800mm wide. I'm trying to get the doorway as wide as 780mm so I can use the 800mm one (cut down).

doors often dont allow more than 6mm an edge
the opening you have sounds perfect for a standard 2ft 6" door[762mm] without all the farting about

 

[Gerrydelasel]

doors often dont allow more than 6mm an edge

Cheap doors yes, but I'm using mortise and tenoned doors.

 

[big-all]

are they solid or veneered
if they are lipped the lipping may only be 6mm

 

[Gerrydelasel]

They're solid pine. I've already used eight of them in other parts of the house, so I know how much they can take.

 

[big-all]

ok fair enough just checking as descriptions can be very misleading