The first is when the property is first built or renovated. This is when, for example, building regulations come into play to decide where things should be and how they should look. Any principal contractor, project manager, architect, or other professional in the construction industry should specialize in this area.
The second step is to make sure that any fire doors are always checked and working. It is one thing to have them work from day one; it is quite another to ensure that they will continue to perform their duties in the future.