Chris McKay, who supervised animation on "The Lego Movie," is directing the script from Seth Grahame-Smith. Roy Lee and Dan Lin are returning as producers along with "Lego" directors Phil Lord and Christopher Miller.
Will Arnett will again voice the Caped Crusader, who mimicked Christian Bale's Batman basso profundo voice in "The Lego Movie" and filled the film with quips such as "I only work in black and sometimes very, very dark grey."
The Lego Batman project will apparently go before Warner's Lego sequel. In February, after "The Lego Movie" opened, the studio announced that it had set the sequel to open on May 26, 2017 and that screenwriters Jared Stern and Michelle Morgan had been hired to write the script.
The studio had no comment Friday about the fate of the sequel or when the Batman Lego movie will open.
"The Lego Movie" was the first project to emerge from Warne's animation the consortium. Most of the animation was produced by Australia-based Animal Logic.
Warner Bros. is also releasing "Ninjago," based on the Lego characters, in 2016. Lin, Lee, Miller and Lord are producing "Ninjago" with Charlie Bean directing.
News about Lego Batman was first reported by The Hollywood Reporter.
Watch the trailer for The Lego Movie below: