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Cities are open systems that rely heavily on external trade and release carbon dioxide (CO₂) as a predominant by-product. Quantification of trans-boundary emissions is essential, especially for the construction sector, which requires great intermediate inputs from upstream sectors locally and globally. This study investigates the global energy-related CO₂ emissions induced by Hong Kong’s construction consumption based on multi-regional input-output analysis for the years 2004, 2007, and 2011. The results showed that the consumption-based CO₂ emissions emitted to sustain the local construction consumption are at least 32.37% higher than those estimated by the conventional approach. The consumption-based CO₂ has slightly declined from 2004 to 2011. This trend was closely tied to decreasing emission intensities of upstream sectors, even with strong growth in construction final demand. 96.61–97.41% of …