This is another excellent set of PVC greenhouse plans from North Carolina Cooperative Extension Service. These greenhouse plans walk you through the steps of selecting a location to build your own greenhouse, constructing a greenhouse with PVC pipe and they also include a materials list for what you will need when building your PVC greenhouse.

Once you have used the plans to build your PVC greenhouse they even include a section for operating your PVC greenhouse. In the plans, they state that their PVC greenhouse will hold up to 4 inches of dry snow. We haven't seen dry snow since 1942 so you may want to keep snow load in mind when planning a PVC greenhouse.