Andy and Nicki Bruce try to build an experimental flood-proof floating house on an island in Buckinghamshire. But building such a complex design on a site with limited access isn't easy. Rebecca Sturrock has returned to her family home in Cornwall, with her partner Gregory Kewish and an ambitious plan. They will transform a small, damp, single-storey bungalow into a cutting edge home.

A young farmer and architect in Northern Ireland hopes to make a home out of four large shipping containers welded together to form a giant cross. But his tiny budget is soon under threat.

Catch season 12 of Grand Designs from Sunday, 7 June at 18:00 on BBC Lifestyle, channel 174 on DStv.