As you probably know, there are many designs and plans to choose from when building a small backyard greenhouse. Irrespective of your choice, we recommend you to select the right free greenhouse plans for your needs.
Free greenhouse plans
Choose a proper location for the greenhouse. Make sure the surface is perfectly level and the soil is proper for growing vegetables. We emphasize again that it is essential for the greenhouse to get at least 8 hours of direct sun every single day.
Therefore, make sure you choose the right orientation. Go to the town hall to make sure you comply with the local building codes. In some cases a building permit might be required, so make all the due diligences, in order to get a professional result.
Use 2x4 lumber for the greenhouse construction. Make sure you invest in weather-resistant lumber, otherwise the components will rot over time and the whole construction will collapse. Use a good saw to make the cuts.
Pay attention to the measurements and to the angle cuts, if you want to get a professional result. Otherwise the components won't lock together properly. Drill pilot holes through the components and insert 2 1/2" screws to assemble the frame of the greenhouse. Make sure the corners are right-angled and add glue to the joints, if you want to get a professional result.
After building the greenhouse, you need to cover it with film or with polycarbonate sheets. Make sure you vent the greenhouse properly, otherwise the plants will die because of the overheating. Fill the greenhouse with a thick layer of fertile soil before planting the vegetables and don't use chemicals, if you want to harvest organic vegetables.
See the full project with step by step instructions and a list of the materials needs at: http://gardenplansfree.com/greenhouse/diy-greenhouse-plans/
How to build a greenhouse - Free plans
If you want to see more techniques regarding building a greenhouse, you should also pay attention to the following vides. In the first video you can see how to build a small greenhouse with a gable roof. Adjust the slope of the roof to match the area in which you live. If you area is full in precipitations, we recommend you to make the slope more steep.
In the second video we show you how to build a lean to greenhouse. Work with attention and check out the full project by clicking the link shown above.