Ship’s captain Dorran promised his family he’d build a super-modern underground lair on a hill outside Canterbury. But as the epic build hits choppy waters, will Dorran fulfil their dream?

Kate and Rob replace their 1940s past-it prefab with a bespoke, modern, factory-built home using volumetric modular construction. But will it feel like the characterful home they dream of?

In Dunstable, John and his wife Helen demolish an old, dilapidated house and in its place build a million-pound, high-tech, accessible glass pavilion, complete with wildlife garden

Corinne plans to build a beautifully crafted, wedge-shaped home on a slither of garden down the side of the house she’s lived in for 24 years. But it sits in a strict conservation area…

In 2015, Vicky and Ed set out to transform a derelict cowshed into a 21st-century smallholding in Somerset. Six years on, how much has this wildly ambitious project changed their lives?

Zimbabwean born Davi and Matt from Australia set out to build a house in the Chess Valley with a radical multicultural design. Can they deliver, or will it end up just a mishmash of ideas?

In 2011, Edward and Hazel set out to build a lighthouse on the north Devon coast. By 2019, they were near bankruptcy with just a rusting shell. Three years on, has anything has changed?

In south Manchester, can Colin and Adele overcome contractor issues, delays and financial ruin to finish the build of their eye-popping curved glass home?

In Derbyshire, Mike and Sarah set out to build a multigenerational longhouse. But with a complicated roof, a shortage of materials and an unexpected bereavement, it proves far from easy...

In 2015, Paul and Carol's plans to build a fortress-like home on the edge of the wild West Pennine Moors were thwarted when they ran out of money and time. Have they finally finished it?

In the longest revisit in Grand Designs history, Kevin McCloud returns to Devon to see if Sue and Martin's renovation of two ancient barns has finally come to fruition, two decades on.