Kevin McCloud returns to follow more ambitious self-builds. Can Zahid and Ferzana transform an old coastguard station on an exposed East Yorkshire headland into a three-storey glass box?

In Lincolnshire, high-flyers Zara and Giuliano set out to build a 400-square-metre malthouse-inspired home, but run into problems from the get-go. Can they get the project off the ground?

In West Yorkshire's rolling hills, Kara and Jonny build a striking stone and zinc home. The challenges come in thick and fast, but can they can pull it off and redefine what accessible design means?

Physical therapist Ara and researcher Tony set out to create a home focused on health and wellbeing on a woodland clearing near Henley-on-Thames. The pair plan to live on site to cut costs with Tony taking on the task of project managing to save Ara any stress that could compromise her already fragile health but as problems arise both Ara and Tony end up labouring onsite and what was meant to be a house of healing is in danger of becoming the opposite.

In Northamptonshire, Adam and Tassy convert a 20-metre-high water tower into a fun family home with curved walls, slides, secret rooms, a firefighter's pole, swimming pool and a sky garden.

On a nostalgic revisit to the first ever Grand Design, from back in 1999, Kevin finds out if Tim and Jules are still flying high in their timber-framed home on the cliffs above Newhaven.