In the first theft, six rock breakers, like that pictured below, were taken from the premises of AMD in Newton Road overnight last Thursday to Friday.
They were worth £12,000 in total.
And overnight on Saturday to Sunday, another three rock breakers, three Stihl saws and a plant compactor were all stolen from the premises of Border Civils and Utilities Ltd in Irongray Road. The total value of the equipment was £11,000.
Police Scotland is carrying out investigations and Constable Gary Bil at Dumfries said: “These two thefts occurred in the same area of the town and the property stolen was situated out in the open, albeit behind security fences.
“Clearly a vehicle and very probably a number of people were responsible and we are asking anyone who may have been in this area over Thursday to Sunday to get in touch if they saw anything suspicious.”