Shapes
Straight to half-turn
Landings or balanced winders — no winder runs to a point at the newel.
Module · Stairs
Stairs that pass the code before they are cut.
Straight, quarter- and half-turn stairs with a landing or balanced winders, treads and risers housed into stringers and newels — checked live against your country's rules, drawn, and sent to the joinery machine with their housings.
What it does
Built for the trade, not bolted on.
Joinery
Housed into stringers
Treads and risers housed into closed stringers and newels, with handrail and balusters.
Rules
Checked live
Approved Document K, IRC/IBC, the French arrêtés and DIN 18065 — each rule with its value, limit and source.
Comfort
Blondel's rule
The comfort rule given as advice everywhere.
Drawings
Plan and stringers
A plan with the walking line and step numbers, and each stringer in elevation.
Machine
Housings in BTLx
Pockets turned to the stringer's pitch, exact in BTLx.
What goes out
The files the workshop reads.
- BTLx with the housings
- Plan and stringer drawings
- Stair list
Who it is for
Joiners and stair makers, and the architects who need a stair that fits the code.
Everything the module does is an action of the same catalogue as the rest of Kozorosa — so an agent, a Python script or the API can lay out a stairs job as well as you, with undo, branches and sharing like any other edit.
Step by step
From the help centre.
Try Stairs on your next job.
Every module is included in the 5-day trial. Buy it once when you are sure; it stays yours.