there are two main Tiny Home Certifiers in the USA. - NOAH: NOAH RDI Home Inspection and Certification provides the opportunity to build with integrity, and access a digitized home inspection for future use. Link: https://noahcertified.org/ - RIVIA: Link: https://www.rvia.org/node/association-and-ansi-adopted-standards

Ensuring the water works on your tiny home water tight is quite helpful; here are a few aids: - these red and black plugs are great from oatey are great for anything drain related; they can easily hold 10 psi (plenty for your drainage abs) - A couple of pressure gauges and and some pipe fittings with a pex at one end and a air hose nipple at the other, with a valve in between, allows you to pressurize the lines as needed (80 psi in this case)