Hi all. This isn't really DIY but I would like some advice from the pros.
We have a staircase currently installed on bare brickwork inside the house. We want this brick plastered over so it'll eventually have to be dot and dabbed.
At the moment there's a staircase installed up against it which we're replacing, but this will have to be done before the plastering.

Basically, I need to tell the joiner building the staircase how far off the wall he needs to install the stairs, so once the wall is plastered, the left string looks like it's attached flush to the newly plastered wall without any gaps.
He mentioned 3cm. Is that about right or could it do with being more/less? Also can anyone see any issues with this plan overall? The stairs are coming well before any plasterer does so I can't ask anyone specifically, and I'm just hoping all plasterers would want this set up in more or less the same way.
Would greatly appreciate any thoughts on this.
We have a staircase currently installed on bare brickwork inside the house. We want this brick plastered over so it'll eventually have to be dot and dabbed.
At the moment there's a staircase installed up against it which we're replacing, but this will have to be done before the plastering.

Basically, I need to tell the joiner building the staircase how far off the wall he needs to install the stairs, so once the wall is plastered, the left string looks like it's attached flush to the newly plastered wall without any gaps.
He mentioned 3cm. Is that about right or could it do with being more/less? Also can anyone see any issues with this plan overall? The stairs are coming well before any plasterer does so I can't ask anyone specifically, and I'm just hoping all plasterers would want this set up in more or less the same way.
Would greatly appreciate any thoughts on this.