We need to get a spine back staircase drawn up to include a 3d model and all of the parts for fabrication on the workshop floor.
I will give you the floor to floor measurements and the size that we require for the base plates / stair treads / mounting plate and the size of the spine . There will be two sizes for the main beam , thye will be 150×100 box section / 200×100 box section
This be ongoing work depending on the work requests at our end
The price is per job so if I ask for two staircases it will be x 2 cost agreed upon and so forth