Interior decorator costs can vary depending on the size and number of spaces you want to work on, the extent or scope of work to be conducted and the speed at which you wish the work to be done. As a rule, it’s best to allocate a percentage of overall project budget to interior decorating, to create the plan on which your execution will be based. Julie Evans Design is one of the few interior decorators who passes on the full trade discount to her clients, so that her fees are frequently recouped – often at a multiple – by the savings her clients make allowing them to stretch or save their budget as they like.