Affable Top Gear presenter James May plans to build a full-sized house made from Lego bricks in Dorking, Surrey.
He hopes that volunteers will gather on Saturday August 1 to help him erect the two-storey building - which May has even pledged to live in for a few days.
The house on the Denbies Wine Estate will feature a staircase, toilet and shower and will be made from more than three million Lego bricks.
May is unsure exactly how many pieces will be needed, so he is asking for Lego brick donations from the public. He told BBC News Online: "I've got a man working on a flushing Lego lavatory. We think it's possible. Things like power supply, sanitation and plumbing coming into the house are as they could be for a real building - everything within my Lego house must as far as possible be Lego."
The project will feature as part of the BBC series James May's Toy Stories.
This isn't the first time May has built something using unconventional materials - he created a Plasticine garden at this year's Chelsea Flower Show, which won him the People's Choice Award.