stables

Hey, Im wondering if anyone has recently built equestrian facilities and if so, at what cost? Im planning on building a 25x45 arena and 5-7 stables. Would also need tackroom and haybarn. if anyone has done similar tips/rough pricing would be much appreciated TIA

As the title says! I am looking for diy / diy assisted in mid / East Sussex ! Can’t seem to find anywhere that’s good enough and half seem to have closed down?! would be happy enough renting one stable of someone on private land