I am thinking of putting an offer on a house. Before I do so, my husband and I need to get an idea of what costs are involved in extending the back of the home 15 feet. We aren't sure if we are looking at something that would cost 75k, 100k, 200k. We just need a ballpark. We have never owned a house or dealt with construction before. I am assuming I will need an architect as well.

Thanks.