@Rushyan, thank you for chiming in!
To me, it seems like these benchmarks are going to continue to expand as more scope is realized and included into the system boundary, as you’ve pointed out. While CLF has some data on MEP systems, I still see this as a big unknown, as well as Refrigerant (and how refrigerant leakage is handled/accounted for).
Comparing the 500 kgCO2e/m2 ILFI number to the Denmark policy makes me think maybe Denmark isn’t including some items within their system boundary too. 12 kgCO2e/m2 across 50 years is a total of 600 kgCO2e/m2.
And likewise with New Zealand’s carbon budgets from BRANZ, is suggesting a carbon budget of 236 tCO2e per office building (avg size of 1,136 m2), which comes out to only 207.75 kgCO2e/m2. Residential is even less at 19.9 tCO2e for medium density housing (avg size of 114 m2), which comes out to only 174.56 kgCO2e/m2.