One of my good friends just installed this new greenhouse in his backyard last week. I went over to his house to see what he put together and for a little building i must say its quite impressive. I think its an 8x12 structure and the planters were built inside along with some pavers to walk on.
Having a way to produce your own food is a very liberating thing to do and having the ability to continue it all year round is a massive bonus in my opinion.
When talking today he told me that he spent less than 1000.00 USD on the greenhouse which is a great deal when thinking about long term benefits.