How much should I budget for an Office interior decorator? When budgeting for an interior decorator, it is important to factor in the cost of the decorator's services, as well as the cost of materials such as furniture, fabrics, wall coverings, lighting, and accessories. The total cost will vary depending on the size and complexity of the project, as well as the quality of the materials chosen. It is advisable to obtain estimates from several office interior decorators in order to compare rates and services offered. Additionally, the budget should also include a contingency fund in case additional costs arise.