Episode 21: We chat with Stephen Blakely about the role of an interior designer, from working with the architect at the design stage to furniture choice and window treatment. Interior designers charge by the job, e.g. by the square foot as Stephen does to take account of the size of the house, but others may charge by the hour. Costs tend to range from £1/€1 to £1.50/€2 per sqft when they are involved from the beginning of the project.