The multi-user warehousing facility has been constructed by local steel company Finley Structures and will increase the Stiller's warehousing capacity to 200,000 sq ft.
The new unit will include a new racking system and Very Narrow Aisle (VNA) handling equipment.
Work began on the new warehouse in February 2015 with initial work being carried out by Richardson's Builders.
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Finlay fabricated and erected 140 tonnes of steel as well as erecting the cladding supplied by Tata Steel.
Commercial Manager Matthew Stiller said: "We were struggling to accommodate our current workload and order book within the space that existed between our own site and another property we currently lease at Central Park on Aycliffe Business Park.
"This is a long-term investment for the company and part of our 10-year business plan to sustain employment and create new jobs in the future.
"We do have a full pipeline of work at the moment but this expansion will enable us to be more efficient and to take on more business."
The building has been designed by ADG Architects of Darlington and BDN Engineers of Durham.
(LM)
