Sarah visit a beautiful lakeside property just outside London, built on land where others were unable to get planning permission. There's also a couple in Surrey have a very clever plan to use the sale of their houseboat to build a mortgage-free floating home, and boost their pension. In the West Midlands, a couple have built a cabin in a relative's garden to be there to help with his Alzheimer's. And a man in Hertfordshire has sold off half of his house, raising £250k for his and his wife's retirement.

Sarah meets a couple building a home out of salvaged lorries for just £5k. And an Edinburgh couple help build a block of money-saving flats.

An inventor plans a futuristic, wheelchair-friendly house for his family in a double-decker bus, all for just £20,000, and a family trade in their costly London life for a debt-free home amid 35 acres of Welsh countryside. Elsewhere, Sarah visits a mortgage-free eco-property in Shropshire, and a salvaged caravan made into a home for just £3,500.

A couple constructs a home from old trailers. A single dad turns a caravan into a luxury home. Two builders make a massive return on their investment.