The firm employed around 50 staff at its works in Barnsley and supplied balconies on apartment block jobs for main contractors like Bam Construct, GB Building Solutions, Shepherd Homes and Inspace Partnerships.
Established in 1997, JGP Engineering grew to become one of the largest architectural metalwork specialists in the UK, helped by the surge in city apartment building.
It started out supplying electric gates but scaled up the business to cover balustrades, balconies, architectural louvers, staircases and structural steel work.
Simon Plant at SFP Group is handling the administration. A spokeswoman for the firm said the administrators were hoping to sell the business.