Construction will start later this month at the former brownfield site to increase production of its Siniat brand by over 50% by 2023.
The state-of-the-art manufacturing facility will have a core focus on sustainability, utilising a rainwater harvesting system, solar PV, electric car charging points and a fully electric forklift fleet.
The extra space will also support post-consumer gypsum recycling.
Construction work is due to be completed by 2023.