George meets a couple who have invested their savings to convert a wreck of a bus into a holiday let, sees how an old underground toilet has been turned into an apartment and finds how a horsebox has been given a new lease of life as a holiday home. George's own project of making over a dilapidated caravan gets off to a shaky start as his builder fails to see the potential in a hulk of rusting metal from the 1970s.

George continues his exploration of the world of small builds, meeting a man planning a bolt-hole in the Lake District, and visiting a community in Hackney, London, that lives and works in customised shipping containers. He also travels to a home in nearby Shoreditch where the kitchen has been moved onto the roof, and finds out how an Oxford resident has turned his back garden into a party palace using a caravan.

George heads to Scotland to meet Julie and George Nicholson, who take an enormous financial risk and commission local designer Sam Booth to build a truly unforgettable, innovative prototype module holiday home. The stakes are high, as the couple have invested their entire savings of £30,000 on a design that's never been tested before. George also takes a trip to Bournemouth and meets Andrew and Emma Collett, who decided not to spend money on a honeymoon but bought a six foot by six foot beach hut to transform into a multi-function small space that can accommodate up to six guests for lunch. Hungry to find inspiration for his own small space caravan design, George visits Gemma Doyle who has lovingly restored some gypsy caravans back to their former glory. And on his own build, George tries to come up with an ingenious solution that will sleep his family of five in a space barely big enough for one double bed.

George meets Ruth Tidd, who is attempting to turn an old caravan that was once used as a home for chickens into an ice cream parlour. He also follows the building of the country's first ever tree tent and is lucky enough to get to try it out, as well as getting the chance to visit some very unique offices built from four old tube carriages. Finally, he travels to Barcelona to take a closer look at the tiny studio flat that thinks it's a five room apartment. And on his own caravan build, George designs a sofa that doubles up as a bath.

George meets a man who drunkenly bought a 1920s showman's carriage on eBay, but quickly sobered up when he saw the poor condition it was in. He visits a holiday home built from an old World War II vehicle and follows the build of Britain's most landlocked beach hut, based in Birmingham. And George faces a major setback with his own project to create an ultra-modern holiday home out of a 1970s caravan, when he discovers the windows he's ordered are actually meant for a boat.

George visits a canal boat that's been revamped as the ultimate bachelor pad as he prepares to unveil his deluxe family caravan. Having bought a 1970s caravan for just £300, George and his team have spent months turning it into an extraordinary holiday home for him and his family. And George meets a man whose simple plan of converting a shipping container into a garden office proved anything but.

George returns for a Christmas special, visiting Christmas-themed builds including a gingerbread house, an underground grotto decorated with over four and a half million shells, and a beach hut advent calendar where every day a festive space opens its doors to the public. George also catches up with expert designer William, to look back on the extraordinary journey to transform his 1970s caravan into a spectacular 21st century holiday retreat.

George meets a woman who wants to build a shop and mobile home out of an old horsebox, but she only has £500 to spend

George visits a futuristic living space at YO! Home, where the double bed rises up out of the floor and into the ceiling, and the kitchen and bathrooms are cleverly hidden from view

George is invited onboard a blinged-up double-decker bus that's been converted into a posh restaurant and bar. He meets a couple living in a railway station and sees their plans for the waiting room.

George catches up with designer Max McMurdo, who is making a classroom out of two rusting shipping containers. And there's also a garden office and a beauty emporium run from a rare 1947 caravan.

George prepares to unveil his own small-space project, an ambitious, accessible, multi-functional tree house within the Calvert Trust, an outward bound activities centre for families with disabilities

In this festive special, George visits an incredible man-made stalactite crystal grotto in Surrey and meets a small spaces enthusiast who has rebuilt and renovated a Victorian flatpack tin chapel in Shropshire to create a magical holiday home. George catches up with carpenter Adam, who created a double-decker bus holiday home on the Brighton coastline, with Jay and Jonathan at their ambulance-turned-campervan in Norfolk, and Barry at his hexagonal home in Lancashire. Meanwhile, it's Christmas in the tree house with Rew from the Land Rover cocktail bar helping to get the celebrations started.

George meets Olly and Tamsin in Bolton, who want to create a fairytale wooden hideaway at the bottom of their garden. And in Kent, Barry and Deleck seek to recreate a classic Teardrop trailer.

George meets a couple risking their life savings on making a family home out of an old Airstream caravan, while his ambitious plans for a multipurpose garden building get a reality check

This episode features a double decker coach turned into a Japanese-style pod hotel, a Texan building made of rubbish, and the man who built his daughter a home in his back garden for £12k

George meets a Manchester couple who decided to spend their nest egg on building an underground casino in a hidden basement in their home. And there's also a woman who built her own shop.

George meets a couple who love VW campervans so much they have given up their jobs and sold their home in order to completely drop out of the rat race. Plus, a family building a home from mud.

George meets two brothers who can't afford to get on the property ladder and plan to transform a fire-damaged narrowboat into a luxury bachelor pad

In the last episode of the series George's garden build is finally revealed and it's time to see if he's transformed his unloved narrow strip of back garden into a magical and creative family space

George plans a woodland retreat for less than the price of a family holiday and visits a breathtaking property in Italy

George meets a man trying to build a UFO-styled house; a woman making a garden room using material including earth, straw and human hair; and visits a floating swimming pool in Italy

The Italian road trip takes in possibly the world's coolest fire station. DIY enthusiasts Ben and Michelle want to build a summer house using disused shipping pallets.

George meets newly-weds investing their life savings in a dilapidated yacht. His Italian road trip takes in a stunning tree house, and his wilderness lodge starts to take shape.

George visits a derelict Victorian railway signal box being turned into a garden summer house in Cumbria, a lakeside glass house in Italy, and a VW campervan conversion in Derby