Carbon Accounting for Construction Companies in India

India's construction sector is booming, but so are its carbon emissions. The industry accounts for approximately 8-10% of global CO2 emissions, with India's contribution growing as rapid urbanization drives demand for new buildings, roads, and infrastructure. For construction companies and real estate developers operating in India, understanding and measuring carbon emissions has shifted from a voluntary best practice to a regulatory requirement under the Business Responsibility and Sustainability Reporting (BRSR) framework.

This guide walks you through carbon accounting specifically for construction operations in India, helping you understand where emissions come from, how to measure them, and what BRSR demands.

Understanding Construction Emissions in India

Construction companies generate emissions across multiple phases and through diverse sources. Unlike many industries with a single dominant emissions stream, construction involves layered complexity that requires systematic tracking and categorization.

Embodied Carbon in Building Materials

The materials you source and use on-site represent a significant portion of construction carbon. Three materials dominate this category in Indian projects:

• Cement: Cement production is one of the most carbon-intensive industrial processes globally. A single tonne of Portland cement generates approximately 0.6-0.9 tonnes of CO2 equivalent. For a typical commercial building foundation in India, hundreds of tonnes of cement are required, making this a critical focus area for carbon reduction.

• Steel: Structural steel and reinforcement steel carry embodied carbon of approximately 1.5-2.5 tonnes CO2e per tonne of steel, depending on production method and recycled content. High-rise construction in Indian metros relies heavily on steel frameworks.

• Bricks and aggregates: While lower per-unit emissions than cement or steel, the sheer volume of bricks used in Indian construction makes this category material. Traditional clay bricks generate 0.15-0.25 tonnes CO2e per thousand units, while concrete blocks have similar or slightly lower emissions.

Tracking embodied carbon requires material declarations from suppliers, bill of quantities from your project specifications, and emission factors aligned with Indian or international standards. Carbon Accounting for Cement Companies in India provides deeper insights into cement sourcing strategies.

Operational Energy and Site Diesel

Beyond materials, construction operations consume significant energy:

• Diesel for site machinery: Excavators, concrete pumps, generators, and transport vehicles run on diesel. A typical construction site in India burns 500-2,000 litres of diesel daily depending on project scale and phase, translating to 1.3-5.2 tonnes CO2e per day per site.

• Electricity for temporary infrastructure: Construction camps, lighting, and power tools draw from the grid. Indian grid electricity has an emission factor of approximately 0.55-0.75 kg CO2e per kWh, varying by region and renewable energy integration.

• Worker transport: Daily commuting of construction workers, site supervisors, and management staff contributes measurable emissions, especially in urban projects where sites are distant from residential areas.

These Scope 1 and Scope 2 emissions must be tracked through fuel purchase records, electricity bills, and vehicle mileage logs.

Construction-Phase vs. Operational Building Emissions

A critical distinction in construction carbon accounting is understanding what falls under your responsibility as the construction company versus what becomes the building operator's responsibility.

Construction-Phase Emissions

Your Scope 1, 2, and 3 emissions during the build period include:

• All materials purchased and installed
• Diesel and fuel consumed by site machinery
• Electricity used for temporary works
• Transportation of materials to site
• Worker commuting during construction

These are typically reported over the construction duration (often 12-48 months depending on project size).

Operational Building Emissions

Once construction completes, responsibility typically transfers to the building owner or operator. Operational emissions include:

• HVAC systems and cooling
• Lighting for permanent installations
• Water heating and processing
• Permanent equipment operation

As a construction company, you may report operational emissions if you retain ownership or operate the building, but most Indian real estate developers hand over to property managers post-completion.

BRSR Requirements for Indian Real Estate and Construction Companies

The Business Responsibility and Sustainability Reporting (BRSR) framework became mandatory for the top 1,000 listed companies by market capitalization in India, effective from financial year 2022-23. For construction and real estate companies, BRSR specifically mandates:

Mandatory Disclosure Indicators

• GHG emissions measurement: Report Scope 1, 2, and 3 emissions in tonnes CO2e using the GHG Protocol Corporate Standard
• Energy consumption: Document total energy consumed (MJ or kWh) and percentage from renewable sources
• Waste management: Track construction waste generation and diversion rates
• Water usage: Report water consumed during construction operations
• Emissions intensity: Normalize emissions against relevant metrics (per square metre of built-up area, per rupee of revenue, or per tonne of material processed)

Scope Clarification for Builders

BRSR requires Indian construction companies to report:

• Scope 1: Direct diesel, petrol, and natural gas consumption on-site
• Scope 2: Grid electricity used during construction
• Scope 3: Category 1 (upstream purchased materials like cement, steel, and bricks) is highly recommended; Category 4 (upstream transportation) and Category 9 (downstream transportation during handover) may apply depending on contract terms

The framework does not require you to report operational emissions of completed buildings unless you retain ownership.

FAQ

What is embodied carbon in construction materials?

Embodied carbon is the total greenhouse gas emissions generated during the extraction, manufacturing, transport, and installation of building materials. For Indian construction, this is primarily driven by cement (largest contributor), steel, and bricks.

How do construction companies measure Scope 3 emissions?

Scope 3 emissions for construction primarily come from purchased materials. You'll need supplier product declarations, bill of quantities, and standard emission factors. Using software platforms like Greenio can automate this calculation by integrating supplier data and material quantities.

Is construction-phase carbon different from operational building carbon?

Yes. Construction-phase emissions occur during the build period (Scope 1, 2, and 3) and are the builder's responsibility. Operational emissions occur after handover and are typically the building owner's responsibility, unless the constructor retains ownership.

When must Indian construction companies report carbon emissions under BRSR?

Top 1,000 listed Indian companies by market cap must report BRSR compliance annually, beginning from FY 2022-23. Reporting deadlines align with annual financial reporting schedules, typically by September following the fiscal year end.

Conclusion

Carbon accounting for construction companies in India is no longer optional - it is a BRSR requirement for large listed entities and a competitive necessity for others. By systematically tracking embodied carbon in materials, operational site emissions, and transportation impacts, you create a foundation for credible sustainability reporting and identify concrete opportunities for emissions reduction.

Start by establishing baseline emissions from your current projects, identify your highest-impact material suppliers (especially cement and steel), and implement monitoring systems for site diesel and electricity consumption. This data becomes invaluable as BRSR requirements tighten and investor expectations for construction sector decarbonization grow.