Top Interior Designers Explain How Good Interior Design Changes the Way We Work and Live. An interior designer creates functional, aesthetically pleasing spaces by blending a client’s style with practical elements like layout and space utilization. Hiring a professional not only elevates your space’s beauty but also prevents costly mistakes in planning and material selection, leading to long-term savings. Designers maximize your budget by choosing high-quality, durable furniture and finishes while securing trade discounts. A well-designed space adds to property value, ensuring both visual appeal and functionality. Without a designer, costly mistakes, inefficient layouts, and poor material choices can compromise your vision and increase expenses.