Okay, let’s tackle this. So Terri has 36 years of experience in interior design, which is a long time. She’s an owner/designer at her own company, which suggests she’s self-employed or has a high level of autonomy. Skills like furnishing, space planning, and window treatments are in demand, but not typically high-paying. Social media skills are also useful, but not necessarily tied to high rates. Location is San Mateo, California, which is an area with a high cost of living. Interior designers with her level of experience might average $75–$150 per hour, but considering her autonomy and skills, maybe slightly higher. Some freelance interior designers can charge $100–$200 per hour. Let’s check averages. I’ll estimate around $100 per hour.