How Much Interior Designer Charge. Charging an hourly interior design fee is another popular pricing option for designers. On average, a typical interior designer will cost $2,000 to $5,000, excluding furniture.
This means that designing a 100 sq.ft. The nature of work will often determine the route they go. Usually, the cost per square foot for interior designing starts at $5 and it can range up to $20 depending on the style of the design.