Which sports the hall must hold
The largest court, its safety margins and the height needed above it set the clear span and clear height. Every extra metre of span adds steel to every roof frame, so design for the sports you will actually play rather than a round number.
When the site is free
Term dates, holidays and examinations decide when heavy lifts and noisy work can happen. Share the school calendar at the start, so the steel is fabricated in advance and ready for the windows when the campus is quietest.
Access through a working campus
Delivery trucks and cranes need a route that does not cross drop-off areas, playgrounds or walkways in use. The route and the crane position affect how the steel is erected, so they are agreed with the school before the method statement is written.
What the roof will carry
Sports halls often hang lighting, sound systems, basketball goals, nets or solar panels from the roof steel. Each adds load across a long span, so list everything that will be fixed overhead before the frames are designed.