The Dengineers build 11-year-old Ben a camouflaged adventure bunker.
Sibling rockers Sami, 9, and Nadia, 12, need their own soundproofed rehearsal room.
A massive Manchester United fan, 10-year-old Billy is in need of a football den.
Ella wants a den to escape the 35 bikes that are kept in every room of the house.
Jazz and Katelyn love dancing and want to put a dance studio in Jazz's mum's cellar.
Eleven-year-old Nathan wants a kitchen hangout, where he can practise being a chef.
Nyobi needs room, a desk space and art materials, for her design projects.
Ten-year-old Ben wants a den with enough room for his beloved train set.
Sienna really needs a new bedroom which can double up as a spy den, with lots of gadgets.
The Dengineers build 10-year-old Aron his very own Bollywood den.
The Dengineers come to the aid of Carrie, a 10-year-old from Leeds who plans to celebrate her red hair with a gingerbread house den.
The Dengineers build 11-year-old Lola an old-fashioned cinema den.
Mark Wright and Lauren Layfield build an `Adventure Den' for nine-year-old Rufus, who has leukemia, and loves climbing around even though he cannot always join in with his friends.
The team build 11-year-old Joshua his very own DJ den and take a visit of the BBC Radio 1 studios.
The team build 11-year-old Whitney her very own den to answer all her eco needs.
The team build 11-year-old Phillip his own den where he can build model planes.
Eleanor, 10, loves books, so the team bring the library to her - a magical library!
The team create a fantastic journalism den where Soibi can write news reports.
The presenters look back at some of the amazing dens from series one and two. Here, Lauren revisits the survival, art, Hollywood cinema and DJ dens.
The presenters look back at some of the amazing dens from series one and two. Here, Lauren revisits the train, magical library, community and plane dens.
Helena needs a den to help her reach for the stars and fulfil her science dreams.
Will needs a rugby den to keep him in the game.
Joe and Lauren help build a den for the children and their siblings at Claire House Children's Hospice in Liverpool.
Ocean, nine, from Brentwood has had a tough time. His younger brother Sky died two years ago and he needs a place to escape to when things get too much for him. He also has a new baby sister which he's excited about but his house has become pretty noisy! Ocean loves marble runs because they're like rollercoasters and one day he'd like to be a rollercoaster designer. He wants a marble run den where he can get away from it all and work towards his dream.
Brothers Alec and William are very proud of their Scottish heritage. And it's not just their family they're proud of, they think Scotland has a really interesting history and they want to celebrate it. The problem is that Alec and William live in a remote part of Scotland and there aren't that many kids around to play with, so they want a den to play in that looks like a traditional Scottish castle.
Nine-year-old Nya shares a room with her two-year-old brother who often wakes her at night and keeps her up to play with him. She really needs her own space to indulge her love of martial arts. She wants it to be a dojo on the inside so she can practise and not worry about her brother getting in the way.
Ten-year-old Dilara has a Turkish Dad and an English Mum. She loves her dual heritage and misses Turkey with all its sights and smells, particularly her grandma's Turkish tea. She would like to share her passion for Turkey with her friends at home in Leeds but there isn't enough room in her house. So, she needs a Turkish Den.
Nine-year-old Kiran is a big fan of a certain boy wizard and a bit like his hero, he's had his life turned upside down. He recently changed schools, moved miles away from all his friends and he hasn't complained once. That's because Kiran helps look after his mum, who has a disability which means she has trouble moving around. His mum's condition meant they needed to be nearer to family. In a place they are still getting used to, Kiran, and Pudding his dog, need somewhere they can escape, to let imaginations run wild and let their love of witchcraft and wizardry come to life.
Eleven-year-old Cammy is one of six siblings. You'd think that would be reason enough for him to deserve his own space, but Cammy also has Sensory Processing Disorder. Sometimes the bustle of his busy family home is too much for him, and when he gets agitated he knows it's too much for his siblings. He thinks they need a break from him as much as he needs a break from them. Cammy's SPD means he can be oversensitive to certain sounds, smells textures and flavours. He needs a place where he can be on his own, in calm and quiet to let his senses relax.
Twelve-year-old Will loves rugby but he had to give it up in order to have chemotherapy. Will has Langerhans Cell Hystiocytosis and it's his rugby community that has got him through it. Being restricted to the sidelines is getting him down so he needs a rugby den to keep him in the game.
The presenters look back at all the amazing dens we've built throughout the series and reminisce about the great kids, the tense surprises, and the big reveals.
Claire House Children's Hospice is a BBC Children in Need supported charity in the Wirral. They do an amazing job looking after children with life-limiting conditions as well as providing much needed care and support to their families. In order to help more children than they can at the moment, they are opening a new site in Liverpool and that is where The Dengineers come in. With the help of all our onscreen designers, and the Blue Peter audience, we are going to build an amazing den for the children.
Eight-year-old Oscar has lived most of his life in the Australian outback where he had an amazing time dirt biking, camping and playing outside. He and his family moved to Ayr a few years ago and while he has made good friends and likes living there, he misses his old outback life. He wants an Australia den so he can remember his hometown and where he can share his memories with his new friends.
Eleven-year-old Amelie loves history and wants to be a royal historian when she's older. Her hero is Queen Victoria, a strong and determined woman who inspires Amelie every day. She wants a Queen Victoria den where she can travel back in time to live like the Victorians and pass on her love of history to her friends.
Eleven-year-old Yusuf has hemiplegia, which means he has a weakness down one side of his body. But he doesn't let it stop him doing what he loves, computer coding. He also dreams of being in the army and hopes to one day bring these two loves together to become an army intelligence officer. Yusuf needs an Army Coding Den where he can code to his heart's content and make his army dreams come true.
Cara, nine, has a form of dwarfism called achondroplasia and finds it difficult to get things appropriate for her height and age. Cara has a sweet tooth and loves to make and eat sweets. She also loves keeping fit and dancing. Cara needs a Sweetie Den where everything is the right height for her and she can disco dance to her heart's desire!
Jilan, 12, has a passion for politics and wants to be prime minister one day. She needs a politics den where she can plan her campaigns in peace and quiet!
Rhodri can't go to his local cricket club as often as he'd like. Rhodri needs a den where he can practice cricket whenever he likes.
Daisy, eight, has type one diabetes and has an insulin pump attached to her 24 hours a day. This doesn't stop her doing her favourite thing - sewing. When she is not at her sewing club, her sewing machine is out and she is designing and making her own creations... until dinner time that is! She has to pack everything away so the family can eat at the table. Daisy needs a sewing den where she can create fabulous designs in peace.
Archie is ten years old and as well as planting, growing and harvesting vegetables, he loves looking after his chickens. Archie sells his home grown veg and eggs locally and uses the profits to buy food for his local food bank. He's taken his enterprise as far as he can and desperately needs a farm den so he can increase his productivity.
11-year-old Tali started doing magic when she was three and has packs of cards in every room of the house to ensure a magic trick is never far away. She is frustrated that there have not been any great female magicians and wants to change that. She needs a magic den where she can practice her tricks in secret, without giving the game away!
9-year-old Campbell loves cycling and uses rollers to train at home, but there isn't much room and he has to move the sofa to put the rollers down. His mum and dad are getting fed up of the oil he gets everywhere. Campbell needs a cycling den where he can cycle all over the world without getting oil on his parents' sofa!
St Hugh of Lincoln Primary School is in Manchester, many of their pupils have specific needs and would benefit from a space of their own. But the school has no extra space. To solve this they had the clever idea of using an old double-decker bus but that was as far as they got. That's where the Dengineers come in. With our top team and expert designer we are the perfect people to convert the bus and give the deserving pupils their much needed breakout space!
The presenters look back at all the amazing dens the team have built throughout the series and reminisce about the great kids, the tense surprises and the big reveals.
The presenters look back at some of our dens from previous series and catch up with our dengineers to see how the dens have changed their lives.
The presenters look back at more of our dens from previous series and catch up with our dengineers to see how the dens have changed their lives.
Twelve-year-old Luke is passionate about black history and wants people to realise how important it is. He reads black history books and has even written poetry about it. He wants the den to be built at his nan’s house so he can share it with all his cousins.
Ten-year-old Caitlin wants to save the natural world and become a conservationist when she’s older. She is passionate about teaching other people how important our world is, and needs a den where she can research and write her presentations.
Eleven-year-old Maariya was scared of going underwater but overcame her fear a few years ago. Now she loves swimming, snorkelling and all things underwater. Sharing a bedroom with her older sister means Maariya needs an underwater-themed den to escape to.
Eight-year-old Nathan loves learning all about the rainforest from his Dad, who grew up near the Amazon. He doesn’t get to visit there often and wants a den so he can feel like he is deep in the Amazonian rainforest every day.
Nine-year-old Becca and her twin brother, Charlie, loved their new chinchillas. However, one of them was pregnant and gave birth and the only way to save them from being rehomed is to have a chinchilla den!
Twelve-year-old Ashley needs an opera-themed den so he can sing to his heart's content. He has Tourette syndrome and singing helps him to overcome it.
Eight-year-old Mei is half Japanese and loves learning more about Japan's culture. She doesn't get to visit as often as she would like so needs a den where she can celebrate her Japanese heritage.
Nine-year-old Jothi had an illness as a baby that caused his legs to not grow properly, meaning he can't visit his favourite crazy golf course. Jothi needs a crazy golf den he can access all the time.
11-year-old Holly has chronic actinic dermatitis, eczema caused by UV light, and needs a calm and relaxing den to help forget about it.
Ten-year-old Evie wants a den where she can spend quality time with her aunt.
Matthew needs a board game den to teach his sister the board games he loves.
Ten-year-old twins Becca and Lottie need a den so they can enjoy wildlife and bugs together. Becca has cerebral palsy and her wheelchair makes it difficult to play in the garden with her sister.
Joe and Meryl look back at all the amazing dens built throughout the series and reminisce about the great kids, the tense surprises and the big reveals.
Joe and Meryl look back at some of the amazing dens from this series and catch up with our Dengineers to see how the dens have changed their lives.
Joe and Meryl take a look back at some of the amazing dens from the series and catch up with our Dengineers to see how the dens have changed their lives. Joe revisits the Queen Victoria, Australia, Sewing and Army Coding Dens.
Ten-year-old Florence from Oxfordshire wants a cool hotel den so that she can relax, hang out with friends and be on holiday whenever she wants.
Doctor Who fan Adam wants a den where he can celebrate his favourite TV show and pursue his passion for drama. His den story takes him on an incredible voyage of discovery that includes a surprise chat with someone very special.
Vilonu is a huge CBBC fan and dreams of becoming a TV presenter when she is older. She wants a space where she can write, film and edit her very own TV shows.
Gregor from Aberdeenshire needs somewhere to practise, store and maintain his bagpipes. A keen player and member of a local pipe band, Gregor one day dreams of becoming a professional. However, his passion requires lots of practice and it’s just too loud for the rest of the family.
Amayah from Sheffield is a huge fan of the weather and dreams of becoming a forecaster. She wants a den where she can study the weather and create her very own forecasts.
Ciarän from Barnsley wants an engineering den where he can create his own inventions, understand how things work and share his knowledge with others. Ciarän is autistic and has always been fascinated by how everyday things work, particularly vacuum cleaners, and loves to build his own creations.
Twelve-year-old Annabell loves to spend time by the sea, but she rarely gets to go because she lives in Milton Keynes, right in the centre of England. She has lots of happy memories of seaside holidays, and would love her very own beach den where she could spend time with friends and relax.
Stan from Cumbria is a talented artist and a huge fan of comics. However, he has nowhere to draw and needs a den to work on his illustrations and display his art.
Amelia from Glasgow wants a space of her own where she can learn about her amazing diverse heritage. With family from Australia, the USA, China and Hong Kong, Amelia wants a den where she can celebrate her incredible international background and study her roots.
Ollie wants a lucky cat-themed den where he can relax, hang out with his favourite feline Graham and work on his very own comic stories.
Lydia from County Durham is passionate about the ancient Egyptians and wants an appropriately themed den where she can learn more about this fascinating period from the past.
Joe and Meryl take a look back at some of the fun moments and amazing dens from the series.
Bea from Hull and her best friend Stanley the sausage dog love to hang out together, but they are seriously short of space. They need a den where Bea can teach Stanley new tricks, and they can be best buddies together.
Siblings Nethuni and Abheetha are obsessed with optical illusions and want a den where they can work together to create new tricks to dazzle their friends.
History buff Hector from Wigan is a huge fan of William Shakespeare. He needs a space of his own where he can store all his history books, write plays and enjoy his hero’s works.
Angel from London is an aspiring tap dancer who has nowhere to practise her moves. She is always scuffing her mum’s floors and annoying her brother with the noise. She needs a tip-top tap dance space where she can train properly, store her costumes and display her medals.
Duncan from Glasgow is passionate about protecting orangutans and wants to raise awareness of their plight within his local community. He wants a den where he can hang out, learn more about his favourite primates and how to help them, and share his passion with friends.
Zoe from Oxfordshire is mad about science and dreams of becoming a scientist one day. She loves to carry out messy, noisy experiments, but her dad works night shifts, which means she has to be quiet while he sleeps. She desperately wants her own space where she can pursue her passions and make a mess whenever she wants!
Keir from Rugby is a massive fan of rollercoasters. Not only does he love to go on rides, he also likes building his own, and one day dreams of becoming a rollercoaster designer. He wants a den where he can celebrate his passion, create new coasters, and share his love of rides with his friends.
Avanaya from Leicester wants a relaxing, Indian-themed den so that she can escape her three cricket-loving brothers, and to remind her of the special times she has spent visiting her grandma in India.
Goalkeeper and football fan Tristan had to take a break from playing with his local team due to illness. He wants a den to help him recover and to store all his football memorabilia.
Emily from the Scottish Highlands, near Inverness, is crazy about crochet, and her crafty creations are taking over the house and driving Mum and Dad mad. She desperately needs a space where she can crochet to her heart’s content, store all her woolly wonders and hang out with mates.
Sea cadet Jonny became fascinated with naval history through his grandad and is now a huge fan. He wants a submarine-themed den where he can celebrate his passion, learn more and enjoy hanging out with mates.
Astrid is nine years old and lives in one of the UK's most famous summer hot spots. But unfortunately for Astrid she prefers the winter and loves Christmas. She wishes Christmas could last all year. She needs a Christmas den so she can enjoy that special day all year round.