Building the cage
Decide the dimensions of your cage, adding 2 feet around the perimeter. Some typical batting cage dimensions are 70-feet-long by 14-feet-wide by 12-feet-high or 65-feet-long by 11-feet-wide by 11-feet-high.
Choose a level location that considers the angle of the sun, how well the area drains and access to a power source for the pitching machine.
Build the floor. Raise the floor for better drainage or use concrete as a stable surface.
Construct the frame with PVC pipe or steel beams. It should be strong enough to withstand wind and the weight of your net. Cement the poles into your flooring for stability. Attach the net to the frame using cables.