Barrier-free windows are subject to certain requirements. It should be possible for a wheelchair user to use the window in the same way as a person with no disabilities. In order to achieve this, obstacles such as fittings that don't open smoothly must be avoided. DIN 18040-2 stipulates that:
- The barrier-free window must be at the right height so that it is possible to look out of the window when seated.
- At least one window must be installed in every room that can easily be opened for ventilation. The force required should be less than 30 Newton.
- The window handle must be fitted at a height of 85 to 105 centimeters or it must be openable in other ways, such as with an electric switch.
In accordance with these instructions, floor-level windows or models that are installed at a parapet height of 60 centimeters are ideal. Fall protection is mandatory for floor-level windows. For people with visual impairments, it must be ensured that operating elements are easily recognizable. This is easy to do with suitable lighting or a choice of contrasting colors.