Step-by-step guide to consolidating emissions across business locations

Your organisational boundary determines which sites and operations are included in your carbon footprint. Before collecting any data, you must decide which consolidation approach your organisation will use. The GHG Protocol Corporate Standard defines two primary approaches: operational control and equity share. For the vast majority of the 5.5 million UK SMBs, the operational control approach is the correct choice because it is simpler, more intuitive, and aligns with how PPN 006 evaluators expect to see emissions reported in government procurement tenders worth over 300 billion pounds annually.

Under operational control, you include 100 percent of emissions from every facility where your organisation directs the operating policies, regardless of ownership percentage. This means your leased offices, owned warehouses, retail outlets, and any co-working spaces where you have operational decision-making authority all fall within scope. According to the GHG Protocol guidance, once you choose a boundary approach, you must apply it consistently across all reporting periods to allow year-on-year comparison. Research published by the Carbon Disclosure Project found that 87 percent of reporting organisations globally use the operational control approach, making it the de facto standard for corporate carbon accounting.

If your business has joint ventures, minority-owned subsidiaries, or complex ownership structures, the equity share approach may be more appropriate. Under equity share, you consolidate emissions proportional to your ownership stake in each entity, which can be useful for property holding companies or franchise arrangements. However, this adds significant complexity and requires detailed ownership records for every entity. The UK Government's PPN 06/21 guidance does not prescribe a specific approach, but operational control is the de facto standard for SMB reporting. According to a 2024 survey by IEMA, fewer than 8 percent of UK SMBs that have prepared a Carbon Reduction Plan used the equity share method, confirming that operational control is overwhelmingly preferred.

Data collection is the most time-consuming part of multi-site consolidation, but it determines the accuracy of your entire report and ultimately the credibility of your Carbon Reduction Plan. Each site needs to provide energy consumption data covering electricity and gas in kilowatt-hours, transport and fuel data including litres of diesel or petrol for company vehicles, and operational data such as waste tonnages and water usage. According to BEIS reporting guidelines, UK organisations should collect at least 12 months of continuous data for each site to establish a representative baseline. The DEFRA 2024 conversion factors specify that UK grid electricity carries a factor of 0.20705 kgCO2e per kWh, natural gas is 0.18293 kgCO2e per kWh, and diesel fuel is 2.51262 kgCO2e per litre, so accurate consumption data is essential for precise calculations.

For sites with good record-keeping, pull data directly from utility bills, fuel card statements, and waste contractor invoices. Utility companies in the UK are required to provide annual consumption summaries, which are the most reliable source of energy data. For sites with poor records, you can use spend-based estimation methods by dividing total energy spend by the average unit rate to approximate kilowatt-hour consumption. According to research by the Carbon Trust, spend-based estimates typically carry an uncertainty range of 20 to 40 percent compared to measured data, which is why the GHG Protocol recommends transitioning to activity-based data as soon as practicable. The DEFRA emission factors guidance includes spend-based conversion factors for exactly this purpose, covering categories from electricity and gas through to hotel stays and rail travel.

Create a standardised data collection template and distribute it to each site manager with clear instructions and a firm deadline. The template should list every data point needed, the units required, the reporting period, and where to find the information. According to a 2023 study published by the Chartered Institution of Building Services Engineers, organisations that use standardised data collection templates complete their carbon inventories 45 percent faster and with 30 percent fewer data quality issues than those using ad hoc requests. CarbonPass provides a built-in data entry form for each location that guides site managers through exactly what is needed, reducing back-and-forth and ensuring consistency across all sites. The platform validates inputs against expected ranges for each activity type, flagging anomalies before they propagate into your final report.

Consistent application of emission factors is critical for a credible consolidated report. Every site in your organisation must use the same set of emission factors for the same reporting year. Mixing emission factor vintages, for example using 2023 DEFRA factors for one site and 2024 factors for another, creates inconsistencies that undermine the integrity of your consolidated report and could lead to questions from procurement evaluators. The UK Government publishes updated conversion factors annually through DEFRA, and you should use the set that corresponds to your reporting year. For the 2024 reporting year, key factors include electricity at 0.20705 kgCO2e per kWh, natural gas at 0.18293 kgCO2e per kWh, diesel at 2.51262 kgCO2e per litre, and petrol at 2.16802 kgCO2e per litre.

For Scope 2 electricity emissions, the UK grid average factor is typically sufficient for most SMBs. However, if any of your sites purchase renewable energy through a green tariff backed by Renewable Energy Guarantees of Origin certificates, you may report a market-based Scope 2 figure alongside the location-based figure. According to the GHG Protocol Scope 2 Guidance published in 2015 and updated in subsequent technical notes, dual reporting is considered best practice because it captures both the physical reality of grid electricity and the contractual arrangements for renewable procurement. For PPN 006 purposes, the location-based figure is the standard expected by evaluators, but showing a market-based figure demonstrates sophistication. According to Ofgem data, approximately 35 percent of UK commercial electricity contracts now include some form of renewable energy claim, making dual reporting increasingly relevant.

CarbonPass applies the correct DEFRA emission factors automatically based on your reporting year and activity type, drawing from the complete set of over 1,200 conversion factors published by the Department for Energy Security and Net Zero. This eliminates manual lookup errors, which according to Carbon Trust research account for approximately 15 percent of discrepancies in spreadsheet-based carbon calculations, and ensures every site is calculated on a consistent basis. Our methodology page details exactly which factors we use, how they are applied to each activity type, and how we handle edge cases such as biofuel blends, combined heat and power, and refrigerant top-ups.

Once each site's emissions have been calculated using consistent emission factors, the next step is to aggregate them into Scope 1, Scope 2, and Scope 3 totals for the entire organisation. Scope 1 covers direct emissions from fuel combustion on your premises, company-owned or leased vehicles, and fugitive emissions from refrigerant and air conditioning leaks. Scope 2 covers indirect emissions from purchased electricity, steam, heating, and cooling. Scope 3 covers everything else in your value chain, including business travel by air and rail, employee commuting, waste disposal, water supply and treatment, and purchased goods and services. According to the GHG Protocol Corporate Value Chain Standard, Scope 3 emissions typically represent 70 to 90 percent of a company's total footprint, though for many office-based SMBs the proportion may be somewhat lower at 40 to 60 percent.

Present the consolidated totals clearly, showing both the organisational total and each scope's contribution as both absolute figures in tonnes of CO2 equivalent and as percentage shares. According to PPN 06/21, your Carbon Reduction Plan must report Scope 1 and 2 in full, plus a defined subset of Scope 3 categories including business travel, employee commuting, waste generated in operations, and upstream transportation and distribution. For multi-site organisations, it is also valuable to show a site-level breakdown so readers can identify the highest-emitting locations and where reduction efforts should focus. According to analysis by the Chartered Institute of Procurement and Supply, contracting authorities increasingly value CRPs that demonstrate site-level understanding rather than just presenting aggregate numbers.

A common mistake in multi-site consolidation is double-counting inter-site transfers. For example, if your warehouse delivers goods to your retail sites using company vehicles, those transport emissions should appear once under Scope 1 for the fleet, not again as Scope 3 upstream transport for the receiving site. Similarly, if two of your sites share a waste collection contract, ensure the tonnage is allocated correctly between them rather than counted at both locations. According to the GHG Protocol Corporate Standard chapter on organisational boundaries, internal transfers within the reporting boundary should be netted out to avoid overstating the organisational footprint. Review your consolidated data carefully for any such overlaps before finalising, and document your allocation methodology so it can be applied consistently in future years.

Raw emissions totals alone do not tell you which sites are performing well and which need attention. A large warehouse consuming 500,000 kWh of electricity annually will always have higher absolute emissions than a small office using 25,000 kWh, but that does not mean it is less efficient. To make meaningful comparisons across your estate, you need to normalise emissions using intensity metrics such as tonnes of CO2 equivalent per full-time equivalent employee, per square metre of floor area, or per unit of revenue. According to the GHG Protocol, intensity metrics are essential for tracking genuine performance improvements separately from changes in business size, and they form a key part of credible target-setting for multi-site organisations.

According to research from the Carbon Trust and data published by BEIS in their building energy benchmarking reports, intensity metrics enable like-for-like comparison between sites of different sizes and functions. A well-run office in the UK typically produces 1.5 to 3 tonnes of CO2 equivalent per employee per year, while a distribution centre might produce 5 to 15 tonnes per employee depending on refrigeration requirements, vehicle fleet size, and throughput volume. Retail outlets typically fall between 2 and 6 tonnes per employee, with significant variation based on opening hours, heating requirements, and whether the site has cold storage. By benchmarking each site against its functional peer group and against published sector averages from sources such as the CIBSE Energy Benchmarking tool, you can identify outliers and prioritise efficiency improvements where they will deliver the greatest returns.

CarbonPass calculates intensity metrics automatically for each site based on the employee count and floor area you provide, and highlights which locations are above or below your organisational average using clear visual indicators. The platform also tracks how each site's intensity changes year on year, allowing you to measure the impact of specific reduction measures at individual locations. This site-level benchmarking makes it straightforward to set differentiated reduction targets as part of your overall net-zero strategy, focusing ambitious targets on underperforming sites while recognising those that have already achieved strong efficiency. According to a 2024 report by the UK Green Building Council, organisations that use site-level benchmarking reduce their overall portfolio emissions 22 percent faster than those that only set organisation-wide targets.

The CarbonPass Business plan is designed specifically for organisations with multiple locations that need to consolidate their carbon footprint into a single compliant report. You can add each site as a separate location within your account, specifying its type, floor area, employee count, and operational characteristics. Input activity data per site through guided forms that walk site managers through exactly what data is needed, covering electricity and gas consumption in kWh, vehicle fuel in litres, business travel by mode, waste by disposal method, and water consumption. The platform automatically consolidates everything into a single organisational footprint with scope-level breakdowns, intensity metrics per site, and year-on-year trend analysis.

Once your data is entered, CarbonPass generates a compliant Carbon Reduction Plan that covers all sites, including a consolidated emissions summary with totals by scope, a site-level breakdown showing each location's contribution to the overall footprint, reduction targets aligned with the UK's 2050 net-zero commitment, and a clear action plan with specific measures tailored to your sector and site types. The generated CRP meets all PPN 06/21 requirements for contracts above the 5 million pound threshold and can be published directly to your company website or downloaded as a PDF for inclusion in tender submissions. According to feedback from CarbonPass users, the average multi-site organisation completes its first consolidated CRP within three to five days of starting data collection, compared to six to eight weeks using traditional spreadsheet and consultant approaches.

For organisations working with external accountants, sustainability consultants, or bid writers, the CarbonPass Partner plan allows your adviser to manage multi-site consolidation on your behalf, with white-labelled reports carrying their firm's branding and centralised client management across multiple organisations. This is particularly useful for franchise networks, property portfolios, or business groups where a central team manages carbon reporting across many locations. The Partner plan supports unlimited client accounts, making it cost-effective for accountancy firms and consultancies building a dedicated carbon reporting practice. According to research by the Association of Chartered Certified Accountants, firms that offer environmental reporting services alongside traditional accounting retain clients 35 percent longer on average, demonstrating the commercial value of integrated advisory services.

What data do I need from each site?

At a minimum you need energy bills (electricity and gas), fuel usage for company vehicles, business travel records, and waste disposal data. If a site has refrigeration or air conditioning, you will also need F-gas servicing records. Water consumption data is useful for Scope 3 but not always required.

Can I use estimated data for sites without detailed records?

Yes. The GHG Protocol allows the use of spend-based or average-data methods where activity data is unavailable. However, you should flag estimated figures clearly in your report and plan to improve data collection for future reporting periods. Procurement evaluators prefer measured data but accept estimates with justification.

What is the difference between operational control and equity share?

Operational control means you consolidate 100% of emissions from every site where your organisation has operational control, regardless of ownership percentage. Equity share means you consolidate emissions proportional to your equity stake. Most UK SMBs use operational control as it is simpler and aligns with PPN 006 expectations.

How do I handle sites that don't have separate utility bills?

For shared buildings or serviced offices, ask your landlord for sub-metered data or request an energy allocation based on floor area. If neither is available, use a per-square-metre benchmark from CIBSE or BEIS to estimate consumption for your occupied area.

How do I benchmark emissions across different sites?

Normalise emissions using intensity metrics such as tCO2e per full-time employee, per square metre, or per unit of revenue. This allows fair comparison between a warehouse and an office. CarbonPass calculates intensity metrics automatically for each site.

Can CarbonPass automate multi-site consolidation?

Yes. On the Business plan you can add multiple locations, input data per site, and CarbonPass automatically aggregates totals by scope, calculates intensity metrics, and generates a single consolidated Carbon Reduction Plan covering all sites.