Wholesome Andy & Terry's Treehouse Empire
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- The 13-Storey Treehouse was published by Pan Macmillan Australia in 2011, launching a series that's sold over 10 million copies worldwide.
- Andy Griffiths previously wrote the Just! series (1997–2010) and Bum trilogy, cementing his status as Australia's reigning king of kids' gross-out humour.
- Terry Denton illustrated the entire series; his pencil-sketch style packs 30+ sight gags per spread.
- The series has been translated into 35 languages and adapted into a stage musical (2016) and animated series (2020).
- As of July 2026, the fourteenth book — The 182-Storey Treehouse — extends the series to 169 storeys of accumulated madness.
- The books follow a meta-fictional structure: Andy and Terry are characters writing books about themselves, constantly interrupted by their own treehouse's absurd new levels.
The 13-Storey Treehouse — Andy Griffiths
The one that started it all — low-stakes slapstick with a bowling alley, see-through swimming pool, and a tree that grows money. This is the blueprint: Andy and Terry need to finish a book for Mr Big by Friday, but their treehouse keeps derailing them with sharks, flying cats, and a giant gorilla named King Kong. Griffiths nails the 7–10-year-old sweet spot — just enough plot to keep pages turning, zero moralising, maximum physical comedy. Denton's illustrations are the real MVP: every double-page spread is dense with background gags (a penguin wearing a top hat, a banana peel mid-slip) that reward multiple re-reads. It's the gateway drug to the entire series. Explore our current copy of The 13-Storey Treehouse or browse more Humour books at Patina.The 26-Storey Treehouse — Andy Griffiths
Thirteen new storeys, double the chaos — plus a time machine that predictably goes wrong. Book two ups the ante with a mud-fighting arena, an antigravity chamber, and the aforementioned time machine, which Andy and Terry use to travel back to the prehistoric era after they accidentally turn Mr Big into a dinosaur. The series' formula clicks into place here: each book follows the same "we have a deadline / the treehouse distracts us / everything spirals into disaster / we fix it in the nick of time" structure, but Griffiths keeps it fresh with escalating absurdity. The illustrations get busier — Denton's now cramming 40+ visual jokes per spread. Kids who loved book one will inhale this; it's the point where the series proves it has legs. Explore our current copy of The 26-Storey Treehouse or browse more Humour books at Patina.The 39-Storey Treehouse — Andy Griffiths
The pirate level, the chocolate waterfall, and a once-upon-a-time machine that writes bad fairy tales. By book three, Griffiths is leaning hard into meta-humour: the once-upon-a-time machine cranks out terrible stories that Andy and Terry have to act out, complete with Denton's mock-serious illustrations of Terry dressed as a princess. The series' self-awareness — it knows it's repetitive, it knows the treehouse concept is ridiculous — becomes part of the joke. This is where the books start feeling less like standalone adventures and more like episodes of a TV show you'd marathon on a sick day. The target audience (8-year-olds) doesn't care; they want the formula. Preloved copies show their love with cracked spines and dog-eared corners. Explore our current copy of The 39-Storey Treehouse or browse more Humour books at Patina.The 52-Storey Treehouse — Andy Griffiths
Chain-saw juggling, 52-card pick-up, and a vegetable vaporiser — peak middle-series chaos. Book four adds a giant treehouse Robot Detector (which immediately malfunctions) and a hall of funhouse mirrors that clone Terry. Griffiths keeps mining the same comedic vein — physical comedy, wordplay, illustrated lists of "Top 5 Worst Things About Vegetables" — but the jokes still land because the series never pretends to be anything more than silly. The beauty of the Treehouse books is their utter lack of ambition: no lessons about friendship, no coming-of-age arcs, just two mates procrastinating in the world's most dangerous clubhouse. It's comfort food for kids who already know how to read but haven't moved on to Wimpy Kid or Captain Underpants yet. Explore our current copy of The 52-Storey Treehouse or browse more Humour books at Patina.The 65-Storey Treehouse — Andy Griffiths
Jill goes missing, Andy and Terry play detective, and Denton's illustrations do the narrative heavy lifting. This one pivots slightly: instead of Mr Big breathing down their necks, the plot centres on rescuing their neighbour Jill (and her menagerie of animals) from the clutches of an evil fortune-teller. The mystery angle gives the book a bit more structural variety, though the pacing still follows the house style — five pages of plot, ten pages of illustrated digressions, repeat. By book five, you're either fully on board with the series' rhythms or you've tapped out. Kids in the target demographic rarely tap out. The 65-Storey Treehouse is as good a place as any to jump in if you're picking up the series secondhand and don't have book one. Explore our current copy of The 65-Storey Treehouse or browse more Humour books at Patina.The 78-Storey Treehouse — Andy Griffiths
Thirteen more storeys, a 78-flavour ice-cream parlour, and a drive-through car wash for Andy's body. Book six leans into gross-out territory (Andy gets covered in mud, Terry invents a machine to clean him) while maintaining the series' core appeal: it's a permission slip to be silly. Griffiths and Denton understand that kids want books that don't make them work too hard — no vocabulary lists, no thematic analysis, just jokes about butts and farts wrapped in a treehouse frame story. The 78-Storey Treehouse is peak mid-series coasting, which isn't a criticism; it's the point. Preloved copies from As of July 2026, Patina's humour collection tend to show the most wear around books 6–9, the sweet spot where kids re-read them until the spines give out. Explore our current copy of The 78-Storey Treehouse or browse more Humour books at Patina. If you grew up on Paul Jennings' Uncanny! stories or Morris Gleitzman's Worm series, the Treehouse books are the next-gen equivalent — Australian kids' lit that knows funny trumps everything. Griffiths' genius is structural: he's built a series that can run indefinitely (add thirteen storeys, invent thirteen new sight gags, repeat) without ever losing steam. Denton's illustrations are the secret weapon; without them, these would be middling chapter books. Together, they're a national treasure. Shop all Humour books at Patina Paperbacks →What age group are the Treehouse books best for?
The series targets independent readers aged 7–10, though younger kids (5–6) love having them read aloud, and reluctant readers up to age 12 still get hooked on the visual density. Denton's illustrations do so much narrative work that kids who struggle with text-heavy chapters can follow the plot through pictures alone. Honestly, if your kid is bored by traditional chapter books but obsessed with graphic novels, the Treehouse series is the bridge.
Do I need to read the Treehouse books in order?
Not strictly — each book is self-contained enough that you can jump in anywhere — but starting with The 13-Storey Treehouse gives you the character introductions and baseline absurdity level. Kids who binge-read the series do tend to go in order because watching the treehouse grow from 13 to 182 storeys is part of the fun. Patina's humour section usually stocks a rotating mix of early, middle, and late-series titles, so grab whatever's available and fill gaps later.
Where can I buy secondhand copies of Andy Griffiths' Treehouse books in Australia?
Patina Paperbacks keeps a steady rotation of preloved Treehouse titles — we're Sydney-based but ship Australia-wide, and the series is one of our most-requested kids' categories. Secondhand copies tend to show love (creased spines, corner dings) because kids actually read these to death, which is the highest compliment a book can get. Check our current stock under the humour collection or swing by if you're in the Inner West.
Are the Treehouse books similar to Diary of a Wimpy Kid?
They share DNA — both series blend prose with illustrations, target the same age group, and lean into self-aware humour — but Wimpy Kid is more grounded in school-social-hierarchy realism, while the Treehouse books are pure cartoon chaos. If your kid loves Wimpy Kid but wants something less mean-spirited (Greg Heffley is kind of a jerk), Andy and Terry's friendship is sunnier. Think of Treehouse as the younger, sillier cousin — no subtext, just laughs.
Why do kids love the Treehouse series so much?
Because it's a guilt-free dopamine hit. No homework questions at the back, no moral lessons about sharing, just two mates living in a tree with a marshmallow machine and a man-eating shark tank. Griffiths and Denton respect kids' intelligence enough to let them spot the visual jokes without underlining them, and the books move fast — you can finish one in an afternoon and feel like you've accomplished something. It's the literary equivalent of Saturday-morning cartoons, which is exactly what 8-year-olds want.