The inability of organisations to adequately assess climate risk, understand and execute necessary actions contribute significantly to the increase in economic loss from disasters. This is a threat to business resilience and sustainability of the society. Hence, resilience capabilities of organisations need to be improved, and there should be a way of assessing these capabilities. This paper focuses on the methodology adopted and the maturity model produced by utilising Capability Maturity Model (CMM) concept to develop a capability maturity assessment method for built environment flood resilience of micro, small and medium-sized enterprises (MSMEs). Capability areas obtained from literature were refined and carefully mapped to maturity level characteristics obtained from studies on capability maturity, and a conceptual model was produced. The conceptual model was subsequently refined and validated via expert forum and case studies. The study produced a maturity model for assessing flood resilience capability maturity of businesses, and technically provides an outline of steps for improving flood resilience of business premises.