Eight rooms - former prison cells - are dedicated to eight different types of materials. There is the Green Bikes workshop, where old bikes go to be remade into new bikes.
Then there are rooms dedicated to glass jars, plastics, fabrics, craft materials and knick-knacks.
Ms Hatherly said the "jar bar" - for reused glass jars - was particularly popular.
"At this time of year we have a glut of them because everyone's done their processing. But soon we won't have enough of them once people start harvesting."
Ms Hatherly said it was remarkable what sometimes turned up at the Re-use Academy.
"We get some real treasures here. And people can be so creative, they take what seems to be junk and turn it into something beautiful."
The Re-Use Academy is located behind the Whanganui Resource Recovery Centre in Maria Place extension.