Alistair and Karen hope that building a family home in County Antrim, Northern Ireland, could be the key to a mortgage-free life. Alistair grew up close by and wants his son to have the same childhood he had, surrounded by farmland and playing in the stream. The design must meet the needs of an uncertain future - Alistair was recently diagnosed with MS so they have designed the home with wheelchair access in mind.

Despite retiring, Derek and Christine have no intention of slowing down. They want to move from Huddersfield to the south east of England, but simply can't afford the house prices. Their radical solution? At 71 years old, Derek is attempting to build his first house from scratch.

Following people trying to build a house on less than £100k. Jason and his Finnish wife Riikka don't want a big house, but one which perfectly fits their needs.