The Enquirer understands that bidders include Willmott Dixon, SDC, Vinci and Bowmer & Kirkland.
All tenders must be in by February 3 for the major revamp of Butlins’ indoor pool area.
Work will include building an extension to the existing pool, construction of a 28 metre flume tower and five external flume rides.
Associated works include enabling, infrastructure, sewer systems and landscaping.