ShellsinWA, I have just googled Maxwells Buildings, Cowpen, and there is a Cowpen Lane Industrial estate, in Middlesbrough, with an address for Maxwells Buildings. Are you searching in the correct county ?
However, if there was an address - Maxwell's Buildings, Cowpen, Northumberland, i.e. the Blyth area,then keep checking the Northumberland page, as there are some very knowledgeable contributors in here.
Welcome to RootsChat and I hope you get the information you are seeking.