We started with 13 storeys in 2011 and added 13 new levels every year until we reached 169-Storeys (the thirteenth book!!!!!!!!!!!!!) in 2023. This epic series tells the story of how Terry (the illustrator) and Andy (me, the writer) came to live in this amazing treehouse and all the stuff that has happened there (and, believe me, a LOT of stuff has happened!)

If your letters, drawings and feedback is anything to go by, it seems that you love reading them as much as we loved making them! Our treehouse is a great place to hang out and you and your friends are very welcome to visit us any time. We’re open 25 hours a day, 8 days a week and 53 weeks a year: well, what are you waiting for?

Come on up!

Number 1 in the series (but you can read them in absolutely any order!)

Our 13-Storey Treehouse has 13 storeys, including a bowling alley, a tank full of
man-eating sharks and a marshmallow machine that follows us around and fires marshmallows into our mouths whenever we’re hungry. In this book we describe a typical day in the treehouse where Terry and I deal with flying cats, sea-monkeys, a sea monster, a mermaid, real monkeys and a giant gorilla.

Number 2 in the series (but you can read them in absolutely any order!)

Our 26-Storey Treehouse now has 13 new storeys, including an ice-cream parlour with 78-flavours, an ATM (automatic tattoo machine) and the Maze of Doom: a maze so complicated that nobody who’s ever gone in has ever come out again. In this book we tell the story of how Terry, Jill and I all met, how the treehouse got built and why we hate pirates (especially Captain Woodenhead).

Number 3 in the series (but you can read them in absolutely any order!)

Our 39-Storey Treehouse now has 13 new storeys, including a chocolate waterfall, an active volcano (for toasting marshmallows) and the world’s scariest rollercoaster (even dead people are too scared to ride on it!). In this book Terry invents a ‘once upon a time’ machine to write and draw the book for us, but it goes out of control and we have to get the world’s greatest UN-inventor, Professor Stupido, to UN-invent it … which is where the REAL trouble begins.

Number 4 in the series (but you can read them in absolutely any order!)

Our 52-Storey Treehouse now has 13 new storeys, including a watermelon-smashing room, a chainsaw-juggling level and a Ninja Snail Training Academy. In this book our publisher, Mr Big Nose, has been kidnapped by angry vegetables and we have to go undercover, deep into the heart of the Vegetable Kingdom to rescue him (with the help of renowned vegetable fighter, Vegetable Patty).

Number 5 in the series (but you can read them in absolutely any order!)

Our 65-Storey Treehouse now has 13 new storeys, including a room full of exploding eyeballs, a quicksand pit and an ant farm (full of very angry ants!). In this book we go time-travelling in our malfunctioning wheelie bin time machine in an attempt to get a building permit for the treehouse.

Number 6 in the series (but you can read them in absolutely any order!)

Our 78-Storey Treehouse now has 13 new storeys, including a scribbletorium, a giant unhatched egg and a high-security potato chip storage facility. In this book the famous Hollywood director Mr Big Shot comes to the treehouse to make Treehouse: The Movie but, thanks to a best-friend-stealing gibbon and a bunch of sneaky spy cows, things don’t exactly turn out quite the way we hoped.

Number 7 in the series (but you can read them in absolutely any order!)

Our 91-Storey Treehouse now has 13 new storeys, including the world’s most powerful whirlpool, a desert island and a big red button. In this book we have to babysit Mr Big Nose’s grandchildren and make sure they don’t come to any harm, which is not easy because even though our treehouse is a lot of fun, it’s also the most dangerous treehouse in the world.

Number 8 in the series (but you can read them in absolutely any order!)

Our 104-Storey Treehouse now has 13 new storeys, including a refrigerator-throwing range, a money-making machine and a never-ending staircase. In this book I have the world’s worst toothache and I’m in so much pain I can’t write the book without the help of a Joke Writer 2000. But getting one proves to be even more challenging than enduring the world’s worst toothache.

Number 9 in the series (but you can read them in absolutely any order!)

Our 117-Storey treehouse now has 13 new storeys, including a tiny-horse level, an Underpants Museum and the terrifying DOOR OF DOOM! In this book Terry takes over the narration and tells a really dumb story about dots, which is so dumb we end up having to go on the run from the Story Police who want to arrest us for crimes against storytelling. Along the way we meet famous children’s writers Beatrix Potty, Boris Bendback and Dr Moose.

Number 10 in the series (but you can read them in absolutely any order!)

Our 130-Storey Treehouse now has 13 new storeys, including a super long legs level, a GRABINATOR (it can grab anything from anywhere at anytime) and an extraterrestrial observation centre. In this book we—and the treehouse and the tree—get abducted by a giant flying eyeball from the planet Eyeballia and are forced to take part in an intergalactic death battle.

Number 11 in the series (but you can read them in absolutely any order!)

Our 143-Storey Treehouse now has 13 new storeys, including a camping ground, a wrecking ball and a spooky graveyard (where it’s always midnight, even in the middle of the day). In this book we go camping on our camping ground level and end up having the scariest, most disastrous and un-relaxing camping holiday ever!

Number 12 in the series (but you can read them in absolutely any order!)

Our 156-Storey Treehouse now has 13 new storeys, including a wishing well, a lost property office, a lost sausage office and the amazing mind-reading sandwich machine. In this book our Christmas Eve preparations are interrupted by having to deal with an angry publisher, an evil snowman and dozens of cloned, over-excited Santas—all of whom threaten Christmas not only for us but all the children of the world.

Number 13 in the series (but you can read them in absolutely any order!)

Our 169-Storey Treehouse now has 13 new storeys, including an electric pony stable, a hall of funhouse mirrors and a WHATEVER-WEATHER-YOU-WANT dome. In this book we do battle with wild weather, our doppelgangers (Anti-Andy, Terrible-Terry and Junkyard-Jill) and a truancy officer intent on capturing us and making us go to school.