Shelter Kit has been in business for over 40 years and builds simple house kits that come pre-cut, pre-drilled, and designed to be assembled by two inexperienced people. They come with an easy to understand construction manual as well as all the lumber, hardware, flooring, siding, roofing, trim, doors, and windows. Interior finishings are not included. They are also packaged to be easier to deliver to remote properties.
One of the best aspects of this kit system is that the owner can pick the modules they need, which gives the owner-builder the opportunity to design and personalize their home. They also sell kit porches and decks that are made to fit onto the house modules. Shelter-Kit Incorporated is located in Tilton, New Hampshire. See the Shelter-Kit website for more information.