how much does a basement add to the cost of building a house
1 Build Your Own House explains the pros and cons of a crawl space foundation. 2  A full basement foundation for an average home can cost $13,000-$30,000 or more, depending on the width and height of the walls, and whether utilities, windows or other features are included. And an Illinois log cabin owner-builder estimates about $17,000 in costs for a 24'x36' basement foundation with 8' walls with the concrete poured professionally but the rest done as a serious DIY project..