A staircase is one of the few pieces of joinery in a house that is also a piece of structure, and it has to satisfy building regulations on rise, going, headroom and balustrade spacing while also fitting an opening that is very rarely a standard size. Off-the-shelf staircase kits are built to fixed rise and going measurements, which works if your stairwell happens to match; in most renovations and period properties it does not.
We design every staircase from a full site survey: floor-to-floor height, stairwell width and length, headroom at every point along the flight, and any winders or landings required by the layout. That survey becomes a CAD drawing showing the exact rise and going per step, the newel and baluster positions, and how the staircase meets the floor at top and bottom. Building regulations set minimum and maximum figures for rise, going and balustrade gaps, and the drawing is checked against those before manufacture starts.
Staircases in this bracket range from a straightforward replacement of a worn or ugly existing stair, through to an open-tread feature staircase as the centrepiece of an extension or loft conversion, to a full renovation that keeps the existing structure but replaces treads, risers, spindles and handrail for a completely different look and feel.
Getting rise and going wrong by even a small amount makes a staircase uncomfortable to use every single day, and getting it wrong against building regulations can hold up a project at sign-off stage. Staircases also carry real structural load and need correctly specified stringers, newels and fixings, which is not something to improvise from a generic kit that assumes a standard opening.