In the Wye Valley, Rosa and Craig battle the never-ending elements to convert a family-owned, century-old, decommissioned steam railway reservoir into a unique living space

Devoted dad Danny builds a sustainable but affordable stilted house up among the trees in his garden. But with no self-build experience and spiralling costs, can he do it on ambition alone?

In 2013, Jon and Noreen started building a giant treehouse in Gloucestershire. By 2016, the money ran out. Are they finally living up in the trees.

Graeme and Melanie want their new home in Hackney to celebrate their blended family. But squeezing the bright red-clad house onto their tiny garage plot proves a huge challenge.

Furniture maker Lucinda wants to construct a beautifully crafted, two-storey, highly insulated timber home in the woodland of South Herefordshire on a very modest budget, and without using heavy machinery.

Duncan and Liz build a revolutionary Passivhaus Premium powerhouse of a home in the Cotswolds. But with a spiralling schedule and lonesome living, will it really all be worth it in the end?

In 2017, Leigh and Richard bought a derelict Cornish flour mill to restore and turn into their home. By 2021, the rooms and landscaping were still unfinished. Has the grind finally paid off?

In 2019, Olaf and Fritha set out to build on a tricky slice of land in West Sussex, boxed in by an A-road and trainline. Kevin McCloud returns to see how their triangular triumph is faring.