My original plan was to build the greenhouse out of cedar, but because this was my first attempt I didnt want to invest too much into something that might not be exactly what I wanted, so I decided to use pine 2 x 3s for the framing and 6 mil greenhouse plastic for the covering. The entire cost for the 6-10 x 8 greenhouse the was less than $150.00 including all the hardware. Bepas Garden: Building a Greenhouse