Owner Diamond Light Source is looking to replace the existing aluminium standing seam roof at the Harwell Science and Innovation Campus in Oxfordshire and has published an OJEU notice for the job.

The existing roof has been beset with problems due to thermal movement after being fitted by Lakesmere in 2006.

Following the collapse of Lakesmere, the facility’s main building contractor Costain was forced to make a £10m provision following an arbitration ruling to cover remedial works.

Now client Diamond Light Source (DLS) has decided to strip off the entire 32,000m2 roof on the doughnut-shaped electron accelerator.

DLS said: “The contractor can either be a specialist roofing contractor who is able to undertake the Principal Contractor duties or a general/ main contractor who will undertake the PC role and sub-contract the roof works to a specialist roofing contractor (either in-house or externally).”

Contractor must express their interest by December 4 and full procurement documents are available here.