The overall walkout basement cost depends on the design you go for. It is inclusive of the materials, the structural costs as well as the installation costs. In some cases, you also require permits that may be an additional cost. The square foot area of your basement also affects the overall of this basement. In most cases, there needs to be additional landscaping to ensure that the independent entrance is in place. The starting cost of a walkout basement ranges between $20,000 and $25000.