Abstract: The present invention relates to a solid laundry detergent composition in particulate form comprising a plurality of particulate components, the composition comprises: (i) an alkyl benzene sulphonate; (ii) a hydratable material; (iii) from 0% to less than 5%, by weight of the composition, of zeolite builder; (iv) from 0% to less than 5%, by weight of the composition, of phosphate builder; and (v) optionally, from 0% to less than 5%, by weight of the composition, of silicate salt; wherein at least 30%, by weight of the composition, of the particulate components present in the composition comprise at least 15%, by weight of the particulate component, of the hydratable material, and wherein any particulate component comprising at least 5%, by weight of the particulate component, of alkyl benzene sulphonate also comprises at least 15%, by weight of the particulate component, of the hydratable material.