For example the median expected annual pay for a typical Interior Designer I in the United States is $42,330 so 50% of the people who perform the job of Interior Designer I in the United States are expected to make less than $42,330.Source: HR Reported data as of October 2015. Median $42,330. 1  Salary.or example the median expected annual pay for a typical Interior Designer I in the United States is $42,330 so 50% of the people who perform the job of Interior Designer I in the United States are expected to make less than $42,330. Source: HR Reported data as of October 2015. Median $42,330.