The fire was reported around 11:30 a.m. at Superior Play Systems in the 2500 block of Industry Lane in West Norriton Township.
Video from Chopper 6 showed flames and black smoke rising high above the building.
Chopper 6 video of massive warehouse fire in West Norriton Twp.
The fire was last reported to be at four alarms, with additional help being called in from Chester County.
There was no immediate word on the cause of this fire.
No injuries have been reported.
Stay with Action News and 6abc.com as this story develops.