In an announcement that has been widely anticipated within the industry, the 118-year-old title becomes the fourth Northcliffe-owned daily to go weekly this summer.
The Echo is likely to be the last Northcliffe daily to go weekly in the current tranche of changes, which were triggered by new chief executive Steve Auckland’s portfolio review launched earlier this year.
Around five journalists’ jobs are at risk of redundancy as a result of the change, out of a total editorial staff of around 28.
In addition the deputy editor, Martin Mammatt, has been made compulsorily redundant.
The final edition of the daily Echo will be published on Friday 14 October, with the new paid-for weekly launched on Thursday 20 October.
Echo acting editor Steven Fletcher said the new-look weekly title would be a “paper of substance” which could run to up to 184-pages.
He said: “For many years the Lincolnshire Echo has been at the heart of the community in Lincolnshire. This will remain so.
“Reading habits have changed so much and the Echo is moving with the times. People still want to know what’s happening in their area and our news coverage will be more comprehensive than ever.
“We will continue to campaign on behalf of our readers, and hold individuals and public bodies to account.
“But we will also have the chance to offer much more content to readers. There will be more analysis of important issues, we are introducing new columnists and topic areas into the paper, and will give the readers a paper they keep coming back to.
Mark Price, managing director for Lincolnshire Media Group, added: “This is a significant change for the business and a major step forward for advertisers in Lincolnshire.
“A number of jobs are likely to be affected as a result of the move, but the Lincolnshire Echo management team has pledged to do everything it can to limit the number of compulsory redundancies.”
Steven also paid tribute to Martin who leaves after 16 years with Northcliffe titles, the majority of which was spent at the Echo.
“He has been a great servant to the paper, and is a popular member of the staff. The decision to make the position redundant was not taken lightly, and he really will be missed in the newsroom,” he said.
Steven, who is also deputy editor of the Nottingham Post, remains acting editor of the Echo pending a permanent appointment.
The previous editor, Jon Grubb, left earlier this summer to pursue other projects shortly after the potential switch from daily to weekly was first mooted.