Watch this video and more on Shelter
Dermot needs to create "a bungalow downstairs" incorporating a bedroom, bathroom, kitchen, living and dining room.
Dermot is normally confident about presenting a plan. But with a couple as design-literate as Greg and Siobhan, the stakes are that bit higher.
Dermot is in Rathcoole with Mary Moore, the design solution Dermot offers Mary is one of the most unusual and interesting he has ever conceived.
Dermot is in Kilkenny with the Kirwan family where everything that can go wrong has gone wrong.