Matthew Dravitzki, spokesman for Jackson's Wingnut Films production company, told NZPA that the studio was to have been used for filming "The Hobbit".
"It would have been used in the shooting of 'The Hobbit,' yes".
"It's a specialist miniatures shooting facility, it's one of the only ones in the world, and I can't comment at this point as to whether (the damage) will cause a problem," Dravitzki said. "I probably won't know that until after the weekend."
He said that items of "commercial sensitivity" were also stored there.
NZ press said the land and building are worth NZ$3.2 million ($2.2 million).
The fire is another possible set back for "The Hobbit" which is still to be formally greenlit by studios, New Line, Warner Bros. and MGM.