From my head on prefabricated buildings
The quality of construction of your building, which is more important than what you can save, is ensured by a qualified erector. However do not forget to have the building pre engineered if you think you are qualified to put it up yourself. This will save you all the trouble of welding and cutting. Also, make sure that you purchase from a supplier with good customer service so that in case you encounter any problem, they can assist you properly. Lastly, getting the best warranty for your building, paint and its accessories is something that you should make sure of.