You should understand where the building will be parked or planted, ideally on a piece of land you own. Understanding where the fresh water will come from and where waste water will go is very important. Catching rainfall is a popular choice but not very reliable. As for budget, be sure you have a comfortable plan on how the project will be financed.
Shower stalls can be expensive if you buy them, I will be using a 350 gallon plastic water tank for my shower. I will cut a door opening using the part cut out as the door. The door will be hinged with stainless steel hinges and door latch. Plumbing will be installed through tank wall, and in the top of tank is an opening where a small ventilation fan will be installed to let out steamy conditions. A drain will be installed in bottom center of tank with hole through nonslip mat. Hand hold rail will be installed for safety. Total cost less than $500.
One of the most intimidating aspects of taking the plunge and moving into a tiny house is how to actually build the tiny house itself. Many people wanting to embrace the tiny house lifestyle are young or maybe have corporate backgrounds, with no building experience to speak of. Buying a house from a builder can be far more expensive than buying plans and building it yourself, but for a first time builder that can be an impossible task, or can lead to costly mistakes and time delays.