Yes this can be done on Garden Master sheds only. Sheds are up-gradable at extra cost to the next roof model only. All flat roof models can be upgraded to a slope roof, and all slope roof models are available with a gable roof. You cannot get a flat roof model with a gable roof, nor can you have a gable roof with a flat or sloping roof. Please email us regarding pricing for these options and we will provide you with a quote.