Ideally, your site designer has a variety of experience. The range of skills required for creating any type of website is more diverse than you can imagine. If a designer tells you they have done or can do any project, we'd suggest you take that statement with a grain of salt. The process of creating a website can often be an overwhelming process for some people. Consider hiring a designer with whom you have a good rapport and find communicating with easy.
Previous Clients Look at some of their previous clients sites.
Companies which create sites from a pre-packaged template often cost less but don't provide you with custom solutions which may more closely meet your needs. Site designers who are getting started will often create your site for a lower fee, essentially using your project to develop their skills. Your decision should be based on many of these important questions. Also use any other questions you find useful when hiring any other service business for a project. Comparing website designers is sometimes like comparing bananas to bicycles instead of apples to apples.