Party Wall Bruce Spenser Ltd

https://pwbsl.com

Stairs should be installed plumb, level and square.  Movement out of this range is indicative of structural movement which needs to be considered and if necessary addressed.

Communal stairs are a fire exit route

They require an adequate going (tread to riser ratio)

They require handrails and spindles and newels as per BRs

Party Wall Bruce Spenser Ltd

https://pwbsl.com