Before anyone orders equipment, survey the hall as a working space rather than as an empty rectangle. Record the usable length, width, and clear height, then note doors, fire exits, lighting, radiators, wall padding, storage cupboards, and fixed sports equipment.
A scaled sketch is useful, but a few photographs from each corner can reveal obstructions that measurements miss.
Mark the areas that must remain open for basketball, assemblies, cleaning machines, and access. This survey will show whether the room can accommodate one lane, several lanes, or a smaller practice zone, and it gives suppliers enough information to discuss sports hall cricket nets sensibly.