New corridor in old house?

[ZoeZoe]

We are going to split two of our bedrooms in half with a corridor that will eventually lead straight into a new bedroom extension on the back of our house.

So as you walk down the corridor you'd have a bedroom immediately on your left, then at the end of the corridor you'd have a bedroom on your right, then in front of you immediately you'd have the door leading to the new bedroom extension (in the back wall of the original house).

There will be no radiators or obstructions of any kind down the corridor.
The width of the stairs in the original part of the house is 840mm and leads onto a landing that will then lead onto the corridor.
Does this mean the corridor we make in the original house can also be 840mm wide to match the stair width?
Or does it have to follow new building regs and be 900mm wide?

The new corridor will only be in the original house off of the original 840mm stairs, not in the new extension at all.

Please can someone clarify this for me? Thank you.

 

[johnny2007]

Nobody will ever check.
Worst case scenario you will have to take 2 stud walls down when and if you sell.
Go ahead.

 

[big-all]

as your pinch point is 840 further back the only advantage i can see from 900mm is full architrave down both sides off the door,apart from that you could have say bookshelves or shallow hanging display cabinets to use up the space

 

[^woody^]

What do the extension plans say?