Depending on who conducts the majority of the work, whether or not you already have the materials, and other factors, the cost of constructing built-in shelves can range anywhere from a few hundred dollars to well over a thousand dollars. If you want built-in shelves, you should go ahead and get them regardless of the cost since they are a great way to update the look of your house and make better use of the space you have. However, you may permanently save money by finding inventive approaches to using wooden shelves.