Incremental housing is a build model where the owner builds/buys only a small part of the final home. Measures are taken to make additions easy, so that the house is affordable up front and can be expanded as needed. This is simply speaking - start with half a home at an affordable price, and add on as needed. OSE follows the incremental housing model with most of its builds, such as the Microhouse 1 and Seed Eco-Home.
See the concept explained: