Grand Designs Season 5

Andrew and Lowri Davies embark on a project to build an environmentally friendly farmhouse in rural Wales. Encouraged by their architect, they opt for some state-of-the-art experimental building materials; but do their builders know how to use them? As the budget spirals out of control, they find it increasingly difficult to balance the budget with their desire for a sustainable home.

Kevin McCloud meets Julie and Mark Veysey, whose Grand Design is a stunning Miami-style beach house on a beachfront plot overlooking the south Devon coast. Julie and Mark have had several holidays in Miami, and Julie wanted to recreate the outdoor beachfront lifestyle back in England, living in a house full of light and sun, within easy reach of the waves.

This is Belfast, one of the great cities of the industrial revolution, and home to Thomas and Dervla O?Hare. They?ve lived here for 18 years, and although they still love their tiny cottage for its compactness, they?re about to build something much, much bigger. They?re building a 21st century answer to the Roman villa, with a copper roof, glass and concrete walls and vast amounts of living space all arranged around a central courtyard.

Kevin returns to see how Ben Law's woodsman's cottage has changed. The house has bedded down into its landscaped kitchen garden and his life has changed in unexpected ways.

Kevin McCloud meets Pat Becker, who lives in a large Georgian house in Devon. But now that her family have flown the nest, she's building a new home at the bottom of the garden.

Louise and Milko wanted to build the home of a lifetime. Milko's job as a well-paid City banker meant they could think big, so Louise set up her own architectural practice and they bought a disused violin factory in the heart of London's Waterloo. The crumbling building was hemmed in on all sides and had no views, but Louise had a vision of a spectacular loft-style home that would combine stunning design with utter luxury

Kevin takes a trip back to the home of John and Eleni Flood, who completely gutted their Victorian terraced house to create an open, light and modern space

John Cadney and Marnie Moon have never had a permanent home. For 16 years they've camped on land owned by Marnie's parents because they could never afford to buy a house in the area where they live. So John, a carpenter, rolled his sleeves up and decided to build a house for his family with his bare hands. After much searching for the right kind of house they settled on an environmentally friendly four-bedroom log cabin. The whole thing was imported from Finland as hundreds of pre-cut bits of wood. All John had to do is figure out how it all fits together!

Kevin McCloud follows Jeremy and Louise Brown as they try to bring their Grade II Listed 16th-century Gloucestershire farmhouse into the 21st century.

When Monty Ravenscroft and Clare Loewe began looking for a house to buy in London they soon realised that the only affordable option was to build one themselves. They snapped up a dirt cheap slither of land in Peckham at an auction only to be told it was too small to put a house on. Undeterred, three years ago, engineering whiz Monty began building an extraordinary experimental bungalow that filled the site to bursting point.

Kevin returns to see whether the couple's solo attempts to transform a wreck of an old stone building in Leith, with no previous building experience, has been successful.