Nick Knowles and his team help the Newcombe family in Kent, who need to adapt their home to be able to care for their two-year-old son Arlo, who has condition that means his lungs must be constantly supported by breathing apparatus. Trailing breathing tubes, equipment the size of tumble dryers, and no downstairs bathroom have turned their once safe home into a risky space for the family. Nick and the team have amassed a huge group of volunteers for Arlo and the family, as they set to work creating a safe and inspiring space that Arlo and his family can call home.

Tonight DIY SOS and the Bromsgrove volunteers help Karis, who was diagnosed with cerebral palsy as a baby. 28 years later, Karis still lives with her mum, Karen, but now her health is deteriorating and it's making caring for Karis almost impossible.

Older sister Jo is desperate to give Karis a new home, but Jo's own house is wholly inaccessible for Karis - the doors and corridors are too narrow for her wheelchair and there is no disability access to the upstairs. It means this family are facing their worst nightmare: the only way to make sure Karis doesn't have to go in to a residential home is to rebuild Jo's house and reunite the sisters once more.

DIY SOS and BBC Children in Need embark on a truly challenging build for the young homeless people who are being supported by local Blackburn charity Nightsafe.

Young homeless people are often overlooked, vulnerable and very much in need of help. The borough of Blackburn with Darwen is one of the poorest in the country, and there maybe dozens of young homeless on the streets nightly. Across the UK tens of thousands of young people are sleeping rough or in temporary accommodation each year. It's a growing problem that needs addressing. Luckily, the people who run local charity Nightsafe want to make a difference, but their current accommodation facility is full to capacity, so they are desperately in need of a new centre.

As ever, it's an immense challenge, relying on generous volunteers and kind donations. This build is also supported by multiple faiths, as the trades take on the heavenly task of converting an old church hall into a brand new home for six young homeless people.

In Plymouth, Nick Knowles, his DIY SOS team and hundreds of Devon volunteers help the Morfey family.

Nick Knowles takes to the road to catch up with families and communities featured on DIY SOS over the last two decades and to find out what happened after the cameras left.

In Torquay, the team help multiple sclerosis sufferer Stuart, his daughter Lauren and his mother, Lin, who cares for Stuart despite being completely blind.

In Hessle, near Hull, the DIY SOS team help roofer Darren and his three sons, including 17-year-old Oliver who is severely disabled.