Help 4 Homeless Veterans was founded by Tom Wood MBE and his wife Jean 12 years ago.
Since its formation, the pair have always wanted to open a drop-in centre in their hometown - and this week the venue was finally opened.
Tom and volunteers will staff the shop, which is based on Regent Street South, three days a week.
The centre finally opened following a two-year delay on Tuesday in a special ceremony - attended by the Vice Lord-Lieutenant of South Yorkshire John Holt.
Steve Bentham-Bates, the CEO of the charity, said: “With the help of money bequeathed to the charity promised specifically to assist with the aim of creating this centre.
“The charity’s rapid interventions assisting around 700 veterans, nearly 100 in the last 12 months alone has attracted Royal recognition with the award in 2020 of the Queen’s Award for Voluntary Service as well as a number of other community service awards along the way.
“Veterans can ask for help either through calling in to the drop-in shop, or by the website at www.help4homelessveterans.org.”