I was wondering what is the minimum horizontal distance you need to fit a stairs (one flight) to cover a vertical height of 2.8m from floor to first floor level.

No half landing or quarter landing

Thanks

 

I believe the length of the staircase will be determined by the pitch which can be no more than 42 degrees 

https://www.homebuilding.co.uk/staircase-design-guide/

 

its in here

1 hour ago, Christine Walker said:

I believe the length of the staircase will be determined by the pitch which can be no more than 42 degrees 

 

But naively taking the angle is a bit misleading because you get one tread for free, there's one fewer treads than rises as the ”bottom tread” is part of the lower floor (or the top tread is part fo the upper floor ?).

 

From Scottish regs and TennentSlager's link 2800 mm height with a maximum rise of 220 mm gives at least 13 rises of 215.5 mm each. That means 12 treads for 240 mm going each to comply with the 42° angle requirement (well within the minimum 225 mm going) so a total horizontal length of 2880 mm from the nose of the top floor to the nose of the bottom tread.

 

14 rises of a nice round 200 mm gives you 13 treads of 222.12 mm which is more than the minimum 220 given in that guide but less than the 225 given in Scottish regs so you'll need to check for where you are in the UK if you went for that. Well worth putting roughly where you are in the country (e.g., which county) to help with answering this sort of question.

 

Just using 42° would give an distance of 3109.7 mm.

Edited February 8, 20197 yr by Ed Davies

Also you can shorten the "opening" by 1 stair normally, as the BR requirement is 2 metres head height over the whole stair, so the bottom stair can be under the ceiling of the hall.

Try the StairBox design tool on their website - an interactive tool that lets you play with rise, going etc. Brilliant! And.even  has a headroom checker!