They will be adding 14,100sq ft of trading space to their unit at the Gateshead Metrocentre.
Primark first joined Metrocentre nearly 20 years ago, before relocating into its current site in 2010.
The shopping area of the upsized store will cover nearly 80,000 sq ft.
The works to extend into the adjacent unit on the ground floor are currently underway, with an expected opening date to be confirmed for later this summer.
Ben Cox, Senior Asset Manager at Sovereign Centros which helps develop the Metrocentre, commented: “2024 has started just how 2023 finished – with major retailers committing to new, enhanced space at Metrocentre.
“Similar to Zara and Frasers Group, Primark is the next powerhouse brand to make the decision to expand its presence here, made possible by decades of strong performance.
“Delivering this now is a direct response to what our visitors want from Metrocentre, as we continue to deliver best-in-class flagships from some of the UK’s best-loved brands.”
Conor Walsh, Director of Sales UK, South West and North East for Primark, added: “We are excited to be extending our popular Gateshead Metrocentre store to give our customers more of what they love from Primark, which means great value with an enhanced shopping experience and extended product offer.
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“We can’t wait for our customers to see the extended selling space, giving them even more reasons to visit.”
The extension of Primark at Gateshead Metrocentre forms part of the retailer’s recent investment of over £100 million in its UK stores this year, as it celebrates 50 years of Primark in Great Britain.
Primark is the latest leading retailer to have re-committed to Metrocentre.