We built a new T-14 14-compartment martin house for this year. Sitting about 15 feet up on a 3 inch square aluminum pole with winch for maintenance, it looks very nice. All thats left now is to get it filled up with purple martins. Since we don't really have a established colony yet, we are depending on sub-adult martins to start building. They arrive a month or so later than the adults. We'll see what happens.
Next to the house is a rack with a 24 gourd capacity. We currenlty have 12 gourds up. If the rack starts to fill up with martins, we can always add a few.