Know what style of bunk bed you want before making a furniture purchase online. Peruse local furniture stores or search online to compare prices, styles and sizes. For example, some bunk bed styles have a bed on top and a futon on the bottom that can be folded into a couch during the day. Knowing exactly what you want may save an expensive return.
Call the company to ask about their return policy, how long they have been in business, and how your credit card information is protected when making an online purchase. Example - do they store your credit card information where it could be stolen by a disgruntled employee? Or is it destroyed once the purchase is completed? Also, find out if they are a member of the Better Business Bureau; then contact the Better Business Bureau to verify the record of complaints against the company, and how they have been handled.
Make sure you know how the company handles returns if the item is received damaged, or if you need to return it for any reason. Inquire how assembly is handled - some companies use local contractors to assemble furniture if you are unable to do so yourself, or if there is a problem as you attempt to put it together. Ask how missing parts are handled if the situation arises.