Table of Contents • • • • • • • • • • • • • Interior Designer Cost Hiring an interior designer can be a serious investment, but many homeowners feel that the interior designer cost is well worth a beautiful and tastefully-decorated home. Sadly, the cost to hire an interior designer varies based on numerous factors (discussed later). However, looking at more than 1,500 interior design projects across the country, the average interior design cost is $4,776, with most homeowners paying somewhere between $3,407 and $5,143. Interior Designer Cost Structures One of the reasons prices change from designer to designer is their cost structure. Unlike other pros who only charge an hourly rate, interior designers and decorators can charge by the hourly, by a fixed rate, by square footage or by room. To determine an accurate interior design price, you should consider all interior designer cost structures: Hourly Costs The most common way to hire an interior designer is via an hourly wage.