Basic Dimensions for Staircases in Various Building

Basic Dimensions for Staircases

Basic dimensions for staircases in Various Building

Its particular geometry and function makes the staircase a most complex building element. Heights, regulations about the dimensions of the steps, and the choice of material play important roles. Precise execution of the soffits and surfaces is also important. Concrete offers good opportunities in terms of design, loadbearing capacity and production. It meets all the requirements for an escape staircase with regard to fire and heat resistance, acoustic decoupling, and geometry.

A Stair is a system of steps by which people and objects may pass from one level of a building to another.

Staircases made of in-situ concrete can be adapted on site to any floor plan. The different tolerances of building parts already produced can be handled easily. In contrast, precast staircases allow no departures from the design dimensions, but they can be produced quickly and cleanly. It should be ensured that the stairwell is sufficiently large to al low a precast flight of steps to be hoisted into the building. Naturally, the main focus of attention is on the basic regulations about the dimensions of treads and risers, numbers of steps without an intermediate landing etc. A stair is to be designed to span large vertical distance by dividing it into smaller vertical distances, called steps.

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Basic dimensions for staircases 

Building kind Kind of stairs Minimum 

usable width 

[cm]

Rise r min.  

[mm]

Tread t 

max. [mm]

Tread t 

min. [mm]

Residential building with

up to two dwellings

Stairs required by the

building regulations

80 140 200 230
Stairs not required by

the building regulations

(additional stairs)

50 140 210 210
Buildings in general Stairs required by the

building regulations

100 140 190 260
Stairs not required by

the building regulations

(additional stairs)

50 140 210 210

Steps in a stair may be of following types:

1) Bull nose step

2) Round ended step

3) Filer

4) Commode step

5) Dancing step

6) Splayed step

7) Winder

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