What Building Carbon Reporting Covers
Building carbon emissions reporting is the systematic measurement, calculation, and disclosure of greenhouse gas (GHG) emissions associated with building operations. For commercial real estate, this covers direct emissions from on-site fuel combustion (Scope 1), indirect emissions from purchased electricity and district cooling/heating (Scope 2), and value chain emissions including tenant activities, embodied carbon, and commuting (Scope 3). Carbon reporting has moved from voluntary corporate responsibility to regulatory requirement in many jurisdictions and is now a standard component of ESG disclosure.
Why It Matters
Buildings account for approximately 28% of global energy-related CO2 emissions (39% including construction). Institutional investors, corporate tenants, and regulators increasingly require transparent carbon data. The Task Force on Climate-related Financial Disclosures (TCFD) recommendations, now mandatory in many markets, require disclosure of climate-related risks including carbon emissions. Science Based Targets initiative (SBTi) requires companies to set emission reduction targets aligned with the Paris Agreement. For building owners and occupiers in Bangladesh, carbon reporting positions assets for international investment, multinational tenancy, and green financing.
Scope 1 — Direct Emissions
Scope 1 covers all direct GHG emissions from sources owned or controlled by the building. For commercial buildings, this primarily includes: natural gas combustion for heating or cooking, diesel or gas consumption in backup generators, refrigerant leakage from HVAC systems, and fuel combustion in company vehicles. In Bangladesh, generator fuel consumption is often a significant Scope 1 source due to unreliable grid power.
Calculation: multiply fuel consumption (litres, cubic metres, or kWh) by the appropriate emission factor. Diesel: 2.68 kgCO2e/litre. Natural gas: 2.02 kgCO2/m3. Refrigerant leakage is calculated from the Global Warming Potential (GWP) of the refrigerant type and the quantity lost: R-410A has a GWP of 2088, R-32 has 675, R-134a has 1430.
Scope 2 — Indirect Energy Emissions
Scope 2 covers indirect emissions from the generation of purchased electricity, steam, heating, or cooling consumed by the building. This is typically the largest emission source for commercial buildings. Two methods exist:
Location-based method: Uses the average grid emission factor for the region. Bangladesh grid emission factor: approximately 0.59 kgCO2/kWh (varies by source). This method reflects the actual emissions from the regional grid.
Market-based method: Uses emission factors specific to the electricity contract or instrument (renewable energy certificates, power purchase agreements, green tariffs). A building purchasing 100% renewable electricity can report zero Scope 2 emissions under the market-based method. GHG Protocol requires reporting under both methods.
Scope 3 — Value Chain Emissions
Scope 3 is the most complex category for buildings and includes: tenant energy consumption in buildings where the landlord reports (Category 13 - Downstream Leased Assets), embodied carbon in construction materials and renovations (Category 2 - Capital Goods), employee commuting (Category 7), waste generated in operations (Category 5), and water supply and treatment (Category 6). Full Scope 3 reporting is challenging but increasingly expected by investors and rating agencies like GRESB.
Reporting Frameworks
GHG Protocol: The most widely used accounting standard. Requires organisational and operational boundary setting, Scope 1 and 2 reporting (Scope 3 recommended), base year definition, and emission factor documentation.
TCFD: Requires disclosure across four pillars: governance, strategy, risk management, and metrics and targets. Buildings-specific metrics include: total operational carbon (kgCO2e/m2/year), carbon reduction targets, and transition risk assessment for carbon-intensive assets.
SBTi: Requires emission reduction targets consistent with limiting global warming to 1.5 degrees C. For real estate, SBTi has published sector-specific guidance with a target of 1.5 degrees C-aligned carbon intensity pathways for different building types.
GRESB: The leading ESG benchmark for real estate. Scores buildings and portfolios on energy consumption, carbon emissions, water, waste, and management practices. GRESB participation is expected by most institutional real estate investors.
Practical Steps
Start with Scope 1 and 2 using 12 months of utility and fuel data. Establish a base year (first year of complete data). Calculate emissions using published emission factors. Set reduction targets (SBTi-aligned if possible). Report annually with year-on-year comparison. Expand to Scope 3 categories as data availability improves. Use the Arc platform, ENERGY STAR Portfolio Manager, or dedicated carbon accounting software for calculation and benchmarking.
Standards and References
Key references include the GHG Protocol Corporate Standard, GHG Protocol Scope 2 Guidance, GHG Protocol Corporate Value Chain (Scope 3) Standard, TCFD Recommendations and Implementation Guidance, SBTi Buildings Sector Science-Based Target Setting Guidance, GRESB Real Estate Assessment, CRREM (Carbon Risk Real Estate Monitor), and IPCC emission factor databases.