Buying a Green house

Buying a Green house Mark out an area of your garden to build a new greenhouse. How much space will you have to spare for a greenhouse? What area of land will this take? This will obviously impact on the size of greenhouse that you can either buy or build. Can you get a second hand greenhouse for free or for little money? How many shelves (staging) can you get into the greenhouse? How many sheets of glass will you need? What is the area of a sheet of glass? What is the cost of a sheet of glass? What is the total cost of the glass? How will the glass be attached to the frame? Is there an extra cost for this? Will you have a top opening window and will it cost more? How many plants can you grow and enjoy in your new greenhouse?