The scope of works covers strategic utility services and highways, demolition, earthworks, land remediation and bridges infrastructure at the site.
The council is holding a bidders day on 26 April for interested firms ahead of launching the framework bid race in May.
Firms will be shortlisted in June with awards to the 5-year framework expected in February 2020.
Enfield took direct control for delivering the 10,000-home scheme when Barratt pulled out of its development partnership over a year ago.
Meridian Water will regenerate 85 hectares of land creating a new district in London with schools, health facilities, rail infrastructure and new open spaces.