Five-year-old Jack Dinnen sparked the project after he asked his nursery teacher at Bonnybroom Nursery School in Springburn for a den for him and his friends to play superheroes.
When the teacher produced a pile of cardboard boxes Jack turned up his nose and told her she needed a "couple of joiners."
Luckily, that's exactly what Jack's dad, Jonathon, and granddad John, work as.
They offered up their skills to build the treehouse which Jack and his young friends designed with help from their teachers.
Now, Jack Manor has become the place to be for all the children at the nursery, who have spent the summer playing outside.
And it was Jack who officially opened the treehouse, just as he left the nursery to start at Wallacewell Primary School.
Clair McLauchlan, head teacher at Bonnybroom, said: "It is absolutely fabulous. It is Jack's dream and it was Jack's idea.
"Jack's dad and grandad finished it in June and it has been used the whole summer long, it's wonderful
"It is the best five star lodge we have ever seen."
Jonathon Dinnen, 31, and John Dinnen, 60, built the treehouse using wood donated by Jewson's builders merchants.
Jonathon, from Jordanhill, said: "It is actually amazing seeing it finished and everybody playing in it.
"Jack was over the moon, he was so proud."
Michael Patterson, branch manager at the Maxwell Road Jewson's store said: "We just wanted to help our customer and the local community."
After the treehouse was targeted by vandals in late July, Glasgow Housing Association stepped in to make sure it was safe for the future. They put up lighting and built a pathway to improve security.
Councillor Stephen Curran, the council's education chief, said: "We have very imaginative young people in Glasgow and Jack's treehouse is a fantastic example of what can be achieved with the support of staff and generosity of the local community."