George Clarke introduces award-winning architect Carl Turner to Darren and Hannah, who hope to redesign their bungalow home in Heathfield, East Sussex, on a budget of £45,000. Carl proposes a radical revamp, to be done in stages as finances allow. But with another baby on the way, Darren is keen for the family to get the most space possible now. With money running out and the roof leaking, will the refurb be completed in time for the new arrival?