This paper addresses the use of geosynthetic encasement provided to granular columns for reducing the settlement of the treated ground. The settlement behaviour is analysed and discussed subsequently by considering the design of a full-scale field problem using the currently available design procedure. The influence of different parameters influencing the settlement of encased granular columns in soft clays is studied in this paper. The design procedure is also examined for ordinary granular columns without encasement and the results are compared with previously published results. The results clearly indicate the advantage of geosynthetic encasement in reducing the settlements compared to ordinary granular columns. Further, maximum improvement is observed with granular columns arranged in triangular pattern. The simplified design charts obtained through the parametric analysis will be useful for geotechnical engineers in quickly deciding the settlement improvement of encased granular column treated soft clays. Abbreviations: OGC: Ordinary Granular Column; EGC: Encased Granular Column; SIF: Settlement Improvement Factor. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.