You can expect a walkout basement to cost you around $20,000 more to build than a full, traditional basement. ... You'll also have the option to have the basement finished—again, assuming this is new construction. It will cost an extra $22,000 to $46,000 to turn the basement into a livable, finished space.
Is a walk out basement worth it?
There are numerous advantages to having a walkout basement, with the main benefit being the increase in livable space. While a basement can also have liveable space, many people prefer a walkout because it makes at least part of a basement feel like the rest of the house due to increased light. ... Increased natural light.