Minimum door widths

[DIYTom]

I am adding a new room to my house by taking down the the wall of an existing shower room and building a new stud wall on the large upstairs landing. The new wall requires two doors as it will also contain a vestibule to access the bathroom. I've got a building warrant for all this, stamped and approved. I was hoping to reuse some existing doors I've removed from around the house, and they are all 760mm wide. But on the plans the door widths are all given as minimum 775mm. Didn't even occur to me at the time as most of the doors in the house are over 800mm wide, but none of the ones I have removed for reuse are.
So my questions are firstly, is 760mm wide enough to satisfy building regs? And secondly would I get in trouble as that's not what is on the plans? I don't think the BCO would notice unless he measured it. And if it meets regs anyway would I get away with it?

 

[noseall]

760mm wide doors are certainly adequate for domestic extensions south of the border.

 

[RajSingh2013]

it depends if you have to comply with part m for disabled, in which case your door size is judged by the size of the corridor as well, normally you will have to use 838mm as opposed to 762mm

 

[DIYTom]

The room is upstairs, so I don't think Part M would apply? Also the corridor at that point is 2.4m wide, so you can get square on to the door.

 

[freddiemercurystwin]

Part M? In an extension at first floor level of a house? Get real! OP, just do it.