Scrap metal and two lifting beams have been stolen from the White Cliffs Business Park in Whitfield.
They disappeared between 6.20pm on Friday and 6am on Saturday, from Unit Seven.
The thieves drove onto the open courtyard to steal the items. The lifting beams weigh two tonnes and three tonnes each.
Anyone with information is asked to contact Kent Police in Dover on 01304 240055. Alternatively call Kent Crimestoppers on 0800 555 111.