Grand Designs tonight saw a couple build a tiny two bedroom house near Canary Wharf for £323,000, with the help of their parents.
Presenter Kevin McCloud joined design engineer Joe Stuart, 26, and service designer Lina Nilsson, who boldly aimed to break into the London property market.
The couple in their 20s, built a house on a tiny 38 square metre plot.
They aimed to create house on six different levels, all of which have half a floor.
However, the couple run behind schedule and they go well over budget.

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The young duo build their first home in a 9.5mx4m space, which initially cost the couple £73,000.
They are generously given £110,000 of the budget to build the house by Joe’s parents, who have kindly remortgaged their own house to help the couple.
Thank to his additions to the overall design, Joe still takes the build £90,000 over their £160,000 budget.
However, the total cost to build the property is still less than the average London property. Around £100,000 less to be exact.
The house itself is tiny, and the whole of the top floor is given over to a kitchen space.
Joe said on the Channel 4 show: “We’ve got officially the smallest two bedroom house possible in London, based on the new London regulations.
He added: “The house I was planning to build for £160k is not the house I built here.
“This way of building isn’t the most affordable way of doing it but what we’ve got here, could we have been able to buy it? Absolutely not.”
From one property expert to another – are you looking to selling your house quickly? Phil Spencer has shared his top tips to sell.
The 47-year-old TV presenter told Zoopla those selling her homes should: “Keep a tight rein on (their) solicitor”.
He explained: “Solicitors and property lawyers can be notoriously slow when it comes to the legal work behind buying and selling – the process known as conveyancing. So choose one that’s been tried and tested via recommendations.”