The Great Interior Design Challenge

16 amateur designers battle it out. In the first heat, the group must transform a bedroom each in a modernist former leisure centre in south London.

16 amateur designers battle it out. The three remaining designers are out to impress, working in grade II listed Kentish weatherboard cottages.

Talented amateur designers battle it out. Two designers compete for a place in the quarter-final at a Scottish castle that has been converted into apartments.

The second round of the competition begins as each contestant is given three days and £1,000 to transform a thatched roof bedroom.

The three remaining contestants now have to transform a living room in just three days with a £1,000 budget in a Georgian Terraced house.

In the final round of heat two, two bedrooms have to be transformed in a timber-framed home, in order for one of the two remaining contestants to win a place in the next round of the competition.

The first of the three knock-out rounds, in which designers are challenged to transform a cottage in Tissington.

The three remaining designers redesign a kitchen space in a Victorian half house in Walthamstow.

Two designers compete for a place in the quarter-final. They have to transform awkward attic bedrooms into desirable 1960s riverside homes in Marlow.

In the final heat, four designers compete for a place in the quarter-final. They have to each transform a bedroom in a self-build London estate.

The second round of the final heat see's the three remaining designers take on a reception room in a historic model village.

The last round of the heats follows the two remaining designers as they are challenged to redesign a farm house kitchen.

It is the quarter-final, and the last four designers are in the village of Beer in Devon. Each designer has taken on a sitting room each in a row of coastal cottages. The designer will also be asked to team up with their competitors to test their teamwork skills.

It is the semi-final, the three designers have to redesign a sitting room each in a medieval terrace in the grand cathedral city of Wells. Also each designer must impress in a suprise challenge to test how far they have each come.

It is the grand final. The final two designers are expected to take on three rooms each in an apartment in a grand stately home in Sussex.

In this special programme, we bring together the ultimate rules of design - room by room. Across three series of The Great Interior Design Challenge, our designers have come up with cost-cutting, ingenious ideas about how to get a look for less, and they are all here.

We also have some insider techniques for a better home used by our judges - Sophie Robinson and Daniel Hopwood - plus design secrets from the guest judges featured across the series - interior and architectural designer Oliver Heath, designer Orla Kiely and iconic interior designer Kelly Hoppen.

We have broken down the home into five key rooms and compiled our very own step-by-step guide on how to make the most of each one of them. Meanwhile, presenter and architectural historian Tom Dyckhoff gives his own historic tour of the house - explaining how our homes have shaped up over the years.