Which type of law is the most difficult to change?

Constitutional law is considered the most difficult type of law to change due to the rigorous process involved in amending a constitution. In many jurisdictions, including the United States, changing constitutional provisions requires a supermajority in both houses of Congress and ratification by a significant majority of state legislatures or conventions. This high threshold ensures that only deeply agreed-upon changes, reflective of a broad consensus, can be enacted.

In contrast, statutory law can be amended or repealed through a majority vote in a legislature, administrative law can often be modified through regulatory processes, and common law evolves through judicial decisions and can be adjusted more flexibly by courts over time. The complexity and the higher barriers present in constitutional law underscore why it stands apart as the most immutable compared to other legal forms.