I’m buying a house and would like to erect a pull up bar style piece of equipment to use for exercise. It would comprise 2 x 14ft poles, 4ft below ground and 10ft above from which, only when in use, would I suspend Olympic rings to exercise on. The poles would be joined at the top by a 7ft long bar. This would be within 2 meters of the garden boundary and there would be no raised platform nor would I sit on top of the bar at any point. Do I require planning permission for this?