What it will cost: Interior designers have various fee structures. They might charge an hourly rate (anywhere from $50 to $500); a flat fee, which could be as low as several thousand dollars and as high as five figures; or a percentage of total project costs. You may also be asked to pay a retainer before work begins.Some designers take an approach known as cost-plus — they purchase materials, furnishings and more at a discount, then charge you the retail price, keeping the difference as their fee. If yours uses this method, be sure the cost discrepancies are transparent so that you'll know exactly what you're paying for services.If you're on a tight budget, don't assume that hiring a designer is beyond reach. Many will be happy to arrange a few hours of consulting or will help you source furnishings and decorative accents. Where to find one: The directory of interior designers on Houzz is a good starting place, where you can find designers in your area and beyond and view their portfolios. Your local chapter of the American Society of Interior Designers (ASID) is also a good source. If you spot a room you love when browsing Houzz photos and ideabooks, take note of the designer's name. (You'll see a link to professionals' profiles in the lower-right corner of their photos.) Some designers will work with clients who are based in other cities, though travel time and expenses can add up. Friends with fabulous houses are another likely source. You can also visit show houses and home tours to see which spaces strike your fancy.