having used steel for numerous buildings including an A1 steel building for a small holiday shack built on a rural block i have to say that you need to understand that although the steel kit is economical all the other trades are the same as building any new home although erecting the frame is faster but you may also have to think about off grid power, phone, a sewerage system, water supply, fencing and roadworks but the site plan and building design will be the most important consideration and recommend that you check yourhome.gov to make the best of passive solar design but is it it a house block or acreage, do you have water, phone and power and how many will live in the house?