There are three general types of structures: the bin, the pen, and the pit. The Pit is pretty obvious, and can be useful in retaining moisture in a dry area. Bins are permanent structures, while pens are portable and can be moved from place to place.
BINS:
![](../files/healinggardens/images/newzealand001.img_assist_custom.jpg)
The New Zealand Bin
This classic bin really enables aeration to take place.
It is rather attractive, and easy to make (2x4’s and chicken wire).
![](../files/healinggardens/images/newzealand002.img_assist_custom.jpg)
Variation on New Zealand
This model has four different bins for four stages of decomposition.
The slats in the middle are removable, making shifting and turning easier.
![](../files/healinggardens/images/brickbin003_0.img_assist_custom.jpg)
Block/Brick Bin
This bin can either be permanent or portable, depending on whether the bricks are mortared or not.
Blocks should be laid with windows between them for air circulation.
![](../files/healinggardens/images/stairs005.img_assist_custom.jpg)
Stair-stepped Bins
This is the ideal method for building compost structures on a slope.
PENS
![](../files/healinggardens/images/pen004.img_assist_custom.jpg)
Pens can be any shape or size. They are quick, easy, and inexpensive. One of the benefits of moving a compost pile is that the mineral rich soil underneath the pile is ideal for growing plants.
![](../files/healinggardens/images/pen006.img_assist_custom.jpg)
Pens can also be made from recycled materials! This one is made with snow-fence. Chicken wire and other types of fencing are ideal, but building a compost structure is also a good opportunity to use your imagination!
All illustrations from:
Martin, Deborah L. and Grace Gershuny (Eds.). The Rodale Book of Composting. Emmaus, PA, 1992 : Rodale Press. 179-195.