So I did a little research on the housing system and here's what I found. Thanks to Ketsukie for some info
-There's no level limit to owning a house, anyone can get a house.
-You must first apply for a lease of land in one of the major cities.
-You must gather the ingredients (wood, etc)
-According to some sources, you need a Player with the "Architect" Life job to create a blueprint for your house.
-It seems that you could make houses for your life class, Sewing shop for tailors, Regular shop for merchants, woodworking shop for architects, etc. (confirmed)
-It is possible to have so many houses in one spot, that you make your own city.
-The Housing Zone is a zone for housing especially Players may gather to create a village of their own guild has it. And may be taxable. Or other charges.
Information is NOT complete, but I will try to get as much information as I can.