A solid laundry detergent composition in particulate form comprising a plurality of particulate components, the composition comprises: alkyl benzene sulphonate anionic detersive surfactant; carboxylate polymer; carbonate salt; from 0% to less than 5%, by weight of the composition, of zeolite builder; from 0% to less than 5%, by weight of the composition, of phosphate builder; and essentially free silicate salt; wherein any particulate component that comprises at least 5%, by weight of the particulate component, of alkyl benzene sulphonate anionic detersive surfactant comprises a specific amount of carbonate salt to carboxylate polymer; and wherein the composition has a specific weight ratio of carbonate salt to carboxylate polymer.