Grand Designs - Season 27

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?

Kevin revisits Stuart and Rosie on the Wirral, who turned their 60s bungalow into an ultra-modern wooden family home for £175k in series 17 in 2016. Is it finished yet? And have the neighbours grown to like it?

In 2019, Greg and Georgie set out to transform an old barn in Georgie's parents' garden in Sevenoaks for series 21 in 2021. But unexpected underpinning and the COVID pandemic had other ideas. Is it now complete?