The four-year deal will see winning bidders carry-out the work for the Connect Plus consortium of Balfour Beatty, Skanska, Atkins and Egis.
The framework will cover road infrastructure work including carriageway widening, drainage improvements, barrier installation, road signs and markings.
Work at Dartford will include rebuilding the toll booth plaza as part of plans to introduce “free flow” tolls at the site.
Firms have until October 31 to register their interest with Connect Plus (M25) on behalf of themselves and the Highways Agency Connect Plus House, St Albans Road, South Mimms Procurement Manager Mr Paul Todd EN6 3NP Potters Bar UNITED KINGDOM +44 2033868500 email@example.com
Further details can be found online at the etendering site connectplusm25.bravosolution.co.uk