The supermarket has been delayed by nearly a year because of an objection from Sport England, which needed to ensure that sport pitches, which would be taken over by the supermarket, would be replaced.
It was announced this week that Sport England has now agreed to the plan and the legal paperwork should all be signed within a fortnight.
At that stage, planning permission will be formally granted by Allerdale council’s head of development services.
An Allerdale spokesman said: "We are delighted that we are about to sign off the legal paperwork which will allow work on the Lidl store development in Maryport to begin.
"The final details should be completed in the next two weeks."
Despite the delays, Lidl confirmed this week that it was still dedicated to building the supermarket.
A spokeswoman said: "While we can't confirm any timescales at this point, we are certainly still committed to the project and will be looking to start construction on site as soon as we have planning permission."
It would be the firm's largest supermarket in the country.
Allerdale Investment Partnership announced in July last year, that it had entered into a deal with the German company.