Contractors were working towards restarting work today, but the start has been put back a week.
HS2 paused work on all but the Midlands sites following the lockdown and has been reviewing working practices to allow the restart.
Now Network Rail contractors will restart demolition work at the station to clear the way for new HS2 platforms.
A spokesman said: “Some of our contractors have taken the decision to recommence works on a limited number of work sites.
“Our contractors have thoroughly risk assessed these activities and are confident they can be undertaken safely, protecting our staff and the communities in which we are working.
“Following further planning to ensure works follow the PHE guidance, Network Rail are now planning to restart work at the Euston station site from Monday 20 April.”
Work will start on the deconstruction of the west ramp and the removal of the canopy from platform 17 and 18 ahead of a crane being brought in a week later to remove materials.