What size block use for basement foundation?

For basement foundations, standard concrete blocks are typically 8 inches by 16 inches, with a thickness of 8 inches. These blocks are often referred to as modular blocks and can provide the necessary strength and stability for below-grade construction. In some cases, larger blocks or poured concrete may also be used for additional structural integrity, depending on local building codes and soil conditions. Always consult with a structural engineer or local building authority for specific requirements.