The objective of this dataset is to report on the development of a representative methodology for the conduction of Waste Analysis Campaigns (WACs) of all different types of urban biowaste that will be used as feedstocks for the biobased products within WaysTUP!. These include: meat waste, fish waste, coffee waste, source separated biowaste, used cooking oils, coffee oil from spent coffee grounds, cellulosic rejections of MSWTP, nappies, carton and paper rejections of MSW, sewage sludge, olive oil mill waste and sawdust. The methodology for setting up a WAC is proposed suggesting strict sampling plans, sampling procedures and preservation times in order to ensure that the outcomes of the samplings are representative. This dataset also includes a common protocol for laboratory analysis for the detailed physicochemical characterization of urban biowaste according to the needs and specifications of each pilot plant and feedstock. The laboratory protocol includes the methods of typical analyses that must be performed according to the type (solid, oil etc.) of samples. Guidelines for the uniform representation of results are also included indicating that the sampling records must also accompany the characterization reports.