On what basis is a building's overall energy efficiency usually assessed?

A building's overall energy efficiency is typically assessed based on its energy use compared to similar buildings. This method provides a benchmark for understanding how well a building performs in terms of energy consumption relative to peers with similar characteristics, such as size, function, and geographic location.

By comparing energy use against similar buildings, one can identify areas for improvement and opportunities to enhance efficiency. This comparative analysis is crucial because it accounts for variations in design, occupation patterns, and local climate influences that might affect energy consumption.

While architectural design, cost of construction, and type of insulation have their roles in influencing energy efficiency, they do not provide a direct measure of a building's performance in relation to others. Energy use comparisons facilitate more targeted assessments and are integral to the process of identifying best practices and implementing energy-saving strategies.