What reading level is the Treehouse Books series?

The Treehouse Books series by Andy Griffiths is at a Grades 3.2–4.3 reading level (average Grade 3.6). Intended for Middle Grades (Ages 9–12). There are 12 books in the series.

What order should I read the Treehouse Books books?

The Treehouse Books series has 12 books in order: 1. 104-Story Treehouse, 2. 130-Story Treehouse, 3. 169-story treehouse: Doppelganger doom!, 4. The 117-story treehouse, 5. The 13story Treehouse, and 7 more.

What age is the Treehouse Books series appropriate for?

The Treehouse Books series is recommended for Middle Grades (Ages 9–12). The average content intensity is 1/5.

Treehouse Books Books in Order

12 books by Andy Griffiths. Reading level: Grades 3.2–4.3. Middle Grades (Ages 9–12).

Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Treehouse Books (12 books by Andy Griffiths) lands at reading level Grades 3.2–4.3, with average content intensity 1/5. Intensity stays consistent across the series — a kid who can handle the first book can generally handle the rest.

The reading-order table below lists every book with per-volume reading level and intensity badges so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.

Books

Grades 3.2–4.3

Reading Level

1/5

Avg. Intensity

Middle Grades

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

Treehouse Books Reading Order

#	Title	Reading Level	Content
1	104-Story Treehouse Andy Griffiths	Level 3-4	Gentle
2	130-Story Treehouse Andy Griffiths	Level 3-4	Gentle
3	169-story treehouse: Doppelganger doom! Andy Griffiths	Level 3-4	Gentle
4	The 117-story treehouse Andy Griffiths	Level 3-4	Gentle
5	The 13story Treehouse Andy Griffiths	Level 3-4	Gentle
6	The 143-Story Treehouse Andy Griffiths	Level 3-4	Gentle
7	The 156-Story Treehouse Andy Griffiths	Level 3-4	Gentle
8	The 26-story treehouse Andy Griffiths	Level 4-5	Gentle
9	The 39-Story Treehouse Andy Griffiths	Level 3-4	Gentle
10	The 52-story treehouse Andy Griffiths	Level 3-4	Gentle
11	The 78-story treehouse Andy Griffiths	Level 3-4	Gentle
12	The 91-story treehouse Andy Griffiths	Level 3-4	Gentle

Level 3-4 Gentle

Enjoy This Series in Other Languages

1 edition available in other languages.

es Spanish (1)

La casa en el árbol de 13 pisos

Andy Griffiths

La casa en el árbol de 13 pisos

Andy Griffiths

Level 3-4

Questions about the Treehouse Books series

What reading level is the Treehouse Books series?: The Treehouse Books series by Andy Griffiths is at a Grades 3.2–4.3 reading level (average Grade 3.6). Intended for Middle Grades (Ages 9–12). There are 12 books in the series.
What order should I read the Treehouse Books books?: The reading-order table above lists all 12 books with per-volume reading level and intensity ratings. Start with book 1 and read in publication order unless the table indicates a different recommended order for newer readers.
What age is the Treehouse Books series appropriate for?: The Treehouse Books series is recommended for Middle Grades (Ages 9–12). The average content intensity is 1/5. Check the intensity trajectory above to see whether content gets heavier across the series — if it does, sensitive readers may want to stop earlier in the run.