If you enjoyed the Bartimaeus trilogy, you may also enjoy these series.
http://www.ranker.com/list/books-like-the-bartimaeus-trilogy/jocastatheweird,
Inkheart
Skulduggery Pleasant
Artemis Fowl
The Red Pyramid: The Kane Chronicles, Book 1
If you enjoyed the Bartimaeus trilogy, you may also enjoy these series.
http://www.ranker.com/list/books-like-the-bartimaeus-trilogy/jocastatheweird,
Inkheart
Skulduggery Pleasant
Artemis Fowl
The Red Pyramid: The Kane Chronicles, Book 1