But research found that the site was once a Methodist chapel dating back to 1844 and had since been a retailer, warehouse and office space before becoming derelict.
The crypt was found across the road from a funeral home, which housed the bodies before their reburial and then arranged the memorial stone.
Minister Katy Dunn, who took the memorial service, said: “We don’t know their names, but they lived here and maybe their descendants still do.
“It’s good to remember them and to have this new memorial stone to mark their lives.”
Building work of the new pub was held up after the bodies were found and a Wetherspoon spokesman said: “We worked closely with the experts to ensure the matter was dealt with in the correct manner.”
The pub has since opened and the spokesman added the company was pleased the bodies were “given the fitting tribute they deserve”.