What is the minimum height for working at height?

The determination of the minimum height for what constitutes working at height can vary depending on different regulations and contexts. Generally, a height of 2 meters or 6 feet is often considered the threshold for working at height. 

For example, in many occupational safety standards, if a worker needs to perform tasks at or above this height and there is a risk of falling, specific safety precautions and equipment like fall arresters should be implemented.

However, in some specific industries or regions, the minimum height might be set differently. Some may consider 1.8 meters as the starting point for height-related safety measures. It's crucial for employers and workers to be aware of the specific regulations applicable to their workplace to ensure safety.