A new run of ambitious self-building projects. Artist Sarah returns to her roots in the Durham Dales to create a radical, cannabis-based house. But as costs go through the roof, can she get her hempcrete hub of a home over the line?

Ordering a factory-built house was a no-brainer for manufacturing maestro Pete. But, in true self-building style, even a near-finished project brings challenges like a bat out of hell.

Armed with £100k and nothing but determination and forest timber, Marcus and Abi defy convention by building an off-grid home with no detailed plans in 20 acres of Pembrokeshire woodland.

Pep and Malene are building a modern Viking Hall in the Surrey Hills. Following Pep's cancer diagnosis, it's a race to create a house that cherishes their memories and life together.

Piers and Emma build the first new listed castle in the UK for 100 years, complete with a moat and futuristic tech. It's the biggest ever Grand Design, so is even their £2m budget enough?