The cost of residential interior design can vary widely based on several factors, including the scope of the project, the level of customization, location, and the experience of the interior designer. Here are some general guidelines:

Consultation Fees: Initial consultations may range from $50 to $500 per hour.
Design Fees: Design fees can be charged in various ways, including per hour, per square foot, or as a flat fee. For residential interior design, you might expect to pay anywhere from $1,000 to $10,000 or more for design services, depending on the complexity of the project.
Project Management Fees: If your designer is overseeing the entire project, project management fees can typically add another 10% to 20% to the total project cost.
Materials and Furnishings: The cost of materials and furnishings for a residential project can vary widely. A moderate budget for furnishings, including furniture, lighting, textiles, and accessories, might fall in the range of $5,000 to $30,000 or more.
Labor Costs: If the project involves renovations or construction work, labor costs for contractors, painters, and other professionals should be considered. Labor costs can significantly impact the overall budget.
Contingency Fund: It’s advisable to set aside 10% to 20% of the total budget as a contingency fund to cover unforeseen expenses.

Keep in mind that these are general estimates, and the actual cost can vary based on your specific requirements and preferences. Some designers may be willing to work with smaller budgets, while others may specialize in high-end or luxury designs with corresponding higher costs. To get an accurate estimate for your residential interior design project, consider consulting with multiple designers, providing them with details about your project, and discussing your budget constraints.