You may not have more than one house (attempting to build another will notify you of the location of the existing one). If you want to move your house, you must tear the original one down.
You may guild the tent, but cannot tranfer it's ownership to another player (except by DPPRA). However, your personal tent may be reclaimed at any time (ownership menu->recover ownership of this tent) - this makes it important to give back to returning people if you've DPPRA their tent ;)
Built: in a compound, uses 13x15 cells, or in a small construction site.
Skill/Tech required: Must be signed up for the Initiation into Architecture
When you reach Prentice of Architecture you can build a Small House.
When you reach Scribe of Architecture you can build a Medium House.