Nuclear service provider Nuvia has doubled its space at MEPC's Birchwood Park in Warrington.
Nuvia has signed up for a further ten years at Birchwood Park, expanding its 17,500 sq ft Chadwick House presence first to 28,500 sq ft, then to 35,000 sq ft by September 2011.
Nuvia's larger premises will initially accommodate its engineering design and consultancy teams, which service the firm's project portfolio.
In 2011, the Birchwood Park premises will also accommodate Nuvia's headquarters and main engineering and consultancy divisions, as they relocate from other parts of Risley, moving 150 staff over.
Nuvia has been based at Birchwood Park since 2001, relocating from Darwin House to Chadwick House in 2006.
John Oram, head of corporate services at Nuvia, said: "It's a particular hub for the engineering design and consultancy areas, and this is important for us as we are constantly seeking design engineers, project managers and consultants to support our growing portfolio.
"We're very pleased to be able to expand our presence at the park, and look forward to consolidating all Risley staff at this location in the coming years."
Jenny Dorn, property and facilities manager at Nuvia, added: "It is a delightful environment in which to work, with recent improvements including the Ramada Encore hotel."
The deal beats the largest of the year in Birchwood in 2009. Last November, MEPC completed the letting of 17,000 sq ft of office space to National Nuclear Laboratory, once part of BNFL before its break-up. NNL moved from Hinton House in Birchwood to Chadwick House.
Birchwood Park is home to more than 20 nuclear-related companies including Amec Nuclear, Rolls-Royce, Serco Assurance and UKAEA.
Savills acted on behalf of Nuvia.