Does anyone know what Building regulations require the minimum width of a corridor to be?

[MinimalistMommi]

Just about to submit a building notice to our council for moving our staircase and need to check out the width of our landing upstairs which the new staircase will be fixed too.
Thank you to anyone who can help me!

you need page 19 of this
It's the official guidance (Approved Document) for the section of the BRs that cover stairs.

Thank you wonky leg, just read through, couldn't actually see minimum width, it just said that if you have a door opening onto the landing (we don't, at the top of new stairs the door opens into bedroom) there needs to be a minimum of 400 mm extra width on top of space for door swinging open.

We already have what will be the new landing in place already and it measures 670 mm for actual corridor, at top of stairs though there is extra space where the stairs will 'land', it measures 11500 mm. Just wanted to clarify if this is sufficient?

Thank you for the link, it will be very useful to us!

Assuming you're in England or Wales, corridor widths are covered by App. Doc. M. However, in dwellings this only applies to the 'principal storey'. This is usually taken to be the storey of the dwelling where the main living activities are done i.e. the ground floor with the kitchen etc. So will cover the space required at the bottom of the stair, but not the top. This is different in Scotland (don't know about N.I.).

There isn't a specified minimum width for a dwelling house stair in Approved Doc K. With no outward opening doors, the landing should be at least a square of the stair width (AD K 1.15).

Guessing here, a narrow bedroom or bathroom door at 610mm plus frame = corridor at 670mm. Stair is wider though?

Abzs just measured old stairs, they are 700 mm wide. The new stair case will be between two original walls of a two up two down cottage so this width can't be changed. We are literally reversing the staircase so it will be in original place, just turned around on itself if that makes sense. So new stairs will also be 700 mm wide. Hope this is OK!

In UK by the way.

So main new corridor upstairs is 670 mm wide but directly at top of the staircase it is 11500mm . So I guess you could say corridor is in small L shape for where the new stairs will land on. From what I've understood from what you've written though, as it is upstairs corridor width doesn't matter?

Sounds like it, but the Council Building Control officer will tell if it's not. They're there to advise as well as say yes or no, so if you're in doubt you can ask them.