Measuring a staircase is an important step in its planning and production.
Determine the position of the staircase start, i.e., the front edge of the first step = establish the staircase length.
This is usually specified in the project documentation. If it is not defined, the staircase length can be derived using the following guideline:
An optimal staircase requires approx. 165 mm of floor space for every 100 mm of height; for a height of 2800 mm, this equals 4600 mm.
A steep staircase: approx. 140 mm of floor space for every 100 mm of height; for a height of 2800 mm, this equals 3900 mm.
A very comfortable staircase: approx. 190 mm of floor space for every 100 mm of height; for a height of 2800 mm, this equals 5300 mm.
Check the right angle of the staircase’s top edge in relation to the length measured in the next step. If the angle is “closing in”, this must be taken into account and the deviation subtracted from the measured horizontal length.
Now measure the length of the flight L1 – drop a plumb line from the top landing to the lower floor (ideally along a wall running beside the flight, if one exists), and from that point measure the distance to the starting edge from point 1.
If there is a wall directly under the top edge down to the floor, the measurement is easier. However, do not forget to check vertical alignment and correct it if necessary. If the top edge is “recessed” behind the plane of this wall, be sure to add the difference.
Be aware of any existing (or future) door trim near the staircase entry – this may collide with the stringer. It is also advisable to measure openings, doors, and other elements on the wall next to the staircase and again assess the possibility of interference.