The army bomb disposal squad was called out to Brunel Way, Catcliffe, Rotherham, after construction workers found what they believed to be an unexploded WW2 bomb.
An examination of the device revealed it to be a practice shell.
A South Yorkshire Police spokeswoman said: “Officers attended a construction site at 3.39pm on Monday on Brunel Way, Catcliffe, Rotherham.
“The incident involved an unexploded device, which was located on the site.
“Officers evacuated the site and the building next to it, as a precautionary measure.
“Explosive Ordanance Disposal attended and carried out a controlled explosion on the device, which appeared to be a practice shell.”