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Fix incomplete or inconsistent carbon data from subcontractors by treating it as an evidence and data-management problem, not a spreadsheet clean-up exercise. Prioritise the suppliers and activities that could materially affect your construction footprint, request underlying activity records, align periods, boundaries and units, calculate emissions on a consistent basis, and retain a visible correction trail. Where primary data is missing or weaker than a suitable proxy, use the better-quality secondary source, label the estimate, and disclose material gaps.
This approach follows the GHG Protocol guidance on collecting primary data from suppliers. It works for subcontracted construction, plant hire, transport, waste, fabrication and professional services, while leaving each supplier’s commercial information protected.
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What should you do first when subcontractor carbon data is incomplete?
Start with materiality. Do not spend the same effort on every subcontractor: focus first on relevant Tier 1 suppliers and activities with the highest expected emissions or the greatest influence over your project. The GHG Protocol recommends targeting requests using spend and/or anticipated emissions impact.
For a construction company, an initial priority list may include high-volume materials purchased through subcontractors, energy-intensive fabrication, concrete and asphalt production, heavy plant and haulage, waste treatment, and any supplier whose work is repeated across several projects. The list should be based on your inventory boundaries and the purpose of the data—not on whether a supplier already has an attractive carbon figure.
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- Rank by likely emissions: use your existing spend, quantities, project bills of quantities or a screening estimate to identify the largest sources.
- Rank by influence: give priority to suppliers for whom contract terms, specifications or procurement choices could change the activity or technology.
- Rank by decision need: data required to measure a reduction or compare design options deserves more scrutiny than data used only for an early hotspot screen.
- Start with Tier 1 where practical: direct subcontractors are usually easier to contact and can often obtain records from their own facilities or upstream providers.
Record why each supplier was prioritised. That explanation makes later decisions defensible when coverage changes or a reviewer asks why a small subcontractor was not chased first.
How should you request usable data from subcontractors?
Use one short, standard request, adapted only where a project genuinely needs different fields. A precise request reduces clarification rounds and makes submissions comparable.
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| Field | What to specify |
|---|---|
| Reporting period | State the start and end dates, and whether the request is for a financial year, calendar year, project phase or contract period. |
| Supplier and location | Name the legal entity, site, project, production facility or product line covered. Do not accept a group-wide total if only one facility supplied the work unless the boundary is explicitly agreed. |
| Activity | Describe what is being measured: electricity, gas, diesel, tonnes of material, cubic metres of concrete, kilometres hauled, waste treated or another defined activity. |
| Unit | Request the original unit and, if useful, a conversion to your preferred unit. Examples include kWh, litres or kilograms of fuel, tonnes of product and vehicle-kilometres. |
| Evidence | Ask for utility bills, meter readings, fuel statements, purchase records, weighbridge tickets, production records or other source documents where available. |
| Method | Ask whether the submission is measured activity data, supplier-calculated emissions, an industry average or a proxy estimate. |
| Factors and assumptions | Request the emission factor, global-warming-potential (GWP) basis where applicable, calculation method, inclusions, exclusions and allocation method. |
| Contact and deadline | Give one contact who can answer questions, a clear due date and a simple way to return the completed template and supporting files. |
Ask for activity data instead of only a supplier-calculated total whenever possible. The Scope 3 Standard states: Minimize errors by requesting activity data (e.g., kWh electricity used, kg of fuels used) and calculating GHG emissions separately.
The quotation appears in Chapter 7 of the GHG Protocol Corporate Value Chain (Scope 3) Standard.
A good request is low friction but not vague. Attach a worked example using fictional values, explain that an estimate must be labelled as an estimate, and invite the supplier to flag fields that do not apply. Follow up rather than silently converting a blank into zero.
What checks catch bad submissions before you calculate emissions?
Validate every submission before multiplying a quantity by an emission factor. A supplier-specific number is not automatically reliable: its completeness, traceability and fitness for the activity still have to be established.
| Check | Question to ask | Typical correction |
|---|---|---|
| Period | Does the date range match the inventory or project period? | Prorate only when the method is documented and appropriate; otherwise request the correct period. |
| Site and entity | Does the figure cover the supplying site and legal entity, rather than an unrelated group total? | Split the value by site or document why a broader boundary is representative. |
| Boundary | Does it include the activity you need, and exclude stages counted elsewhere? | Define whether extraction, manufacturing, transport, installation, use or disposal is included. |
| Activity versus emissions | Is the number kWh, litres, tonnes or another activity quantity, or is it already tCO2e? | Store the original value and prevent a supplier total from being multiplied by a factor a second time. |
| Unit | Are mass, volume, energy and distance units explicit, including prefixes? | Convert with a recorded conversion and retain the source unit. |
| Coverage | Does the submission cover all deliveries, facilities, shifts and subcontracted work in scope? | Ask for a completeness statement and a list of exclusions. |
| Method and factor | Which factor, database, GWP basis and allocation rule were used? | Request the source and version, then recalculate on the basis used for your inventory. |
| Evidence | Can the figure be traced to bills, meters, fuel purchases, production records or tickets? | Mark unsupported values as estimates and seek a better record for priority sources. |
| Currency and spend | If a spend-based method was used, is the currency, price year and scope clear? | Record the currency and deflator or factor basis; do not mix currencies without a documented conversion. |
Keep the unaltered submission. Store your corrected value as a separate version with the reason, date, person making the change and approving reviewer. This prevents a clean spreadsheet from hiding the history of an inconsistent answer.
How do you reconcile conflicting numbers from the same subcontractor?
Do not silently average contradictory submissions. Reconciliation means identifying what each number represents, then selecting one documented basis that is consistent with the inventory boundary.
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- Freeze both versions. Save the original files, emails and attachments with a unique supplier, project and period identifier.
- Map the differences. Compare dates, sites, products, quantities, units, factors, allocation rules, inclusions and exclusions.
- Ask for the source of each figure. Request the utility bill, meter export, fuel statement, production report or calculation workbook behind each number.
- Investigate operational changes. Ask whether facilities, production volumes, equipment, energy sources, haulage routes or estimation methods changed.
- Choose the appropriate basis. Prefer the value that matches the defined boundary and has stronger records. If neither is sufficient, use a suitable secondary source or proxy and explain why.
- Document the decision. Record the selected value, rejected value, rationale, assumptions and any effect on the inventory or trend.
- Escalate material unresolved issues. Assign an owner and due date; show the uncertainty or gap instead of presenting the selected estimate as measured data.
Common causes of disagreement include a supplier sending a corporate total first and a site total later, a year-to-date figure being mistaken for a full-year figure, a change from actual fuel purchases to an intensity estimate, or transport being included in one answer and excluded in another. Those are boundary and method issues, not arithmetic errors.
When is primary supplier data better than a secondary factor?
Use fit-for-purpose data, not a hierarchy in which “primary” always wins. High-quality supplier records are valuable for tracking a particular subcontractor or measuring a project decision, but a well-matched secondary dataset can be more credible than incomplete, poorly documented supplier data.
The GHG Protocol overview of Scope 3 data types distinguishes supplier-specific primary data from secondary sources such as industry averages and proxies. Compare each candidate input on five dimensions:
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|---|---|---|
| Activity and boundary specificity | It represents the exact material, service, site and life-cycle stages in scope. | A generic “per unit” factor with unknown stages or allocation. |
| Technology representativeness | The factor reflects the process, fuel, equipment or production technology used. | An average for a different technology is used without justification. |
| Temporal representativeness | The period and factor year fit the inventory period or have a documented reason for use. | Old or undated data is treated as current without qualification. |
| Geographic representativeness | Electricity mix, regulation, logistics and production geography are relevant. | A distant-region average is used where local conditions materially differ. |
| Completeness and reliability | Coverage is known and supported by records or a transparent methodology. | Missing facilities, unexplained exclusions or an unexplained supplier total. |
| Traceability | Another reviewer can locate the source, factor, assumptions and calculation. | The value arrives as a number with no source or method. |
| Fitness for purpose | The precision is adequate for hotspot screening, supplier tracking or reduction measurement as required. | A screening proxy is used to claim a measured reduction. |
Primary and secondary data can be combined in one inventory. Use the strongest available primary data for priority activities and a suitable secondary source for gaps, while clearly distinguishing the two in your records and reporting.
How should you calculate emissions consistently?
For an activity-based calculation, multiply the activity quantity by a factor that matches its unit, boundary and GWP basis, then retain the intermediate values. The GHG Protocol Technical Guidance for calculating Scope 3 emissions provides the calculation context; your chosen factor source and version should be recorded alongside the result.
Emissions = activity data × emission factor
For example, a subcontractor may provide litres of diesel for excavators, tonnes of asphalt supplied, or kWh used at a fabrication shop. Keep those quantities separate from any tCO2e figure the supplier also reports. If the supplier has already calculated emissions, verify whether its factor includes the same gases, life-cycle stages and GWP basis as your inventory before using the total.
Do not mix activity data from one boundary with an emission factor from another. For a material, decide whether the inventory includes only production, production plus inbound transport, or additional stages. For waste, define whether collection, treatment and disposal are included and avoid counting a stage already captured through another contractor.
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Where allocation is required—for example, a shared plant, facility or fleet—ask how the supplier allocated energy or emissions to your project. Record the allocation driver, such as mass, production hours or another operational basis, and why it represents the work performed.
How do you fill a data gap without disguising an estimate?
First establish whether the gap is missing data, unusable data or a boundary mismatch. Then select the most representative available secondary factor or proxy. The GHG Protocol guidance on filling data gaps supports using secondary data when primary data is unavailable or inferior, provided the choice and limitations are documented.
- Define the activity. State exactly what is missing, such as fuel for one month, a fabrication site or a transport leg.
- Search for the closest match. Match technology, time, geography, product or service and life-cycle stages before considering a broad average.
- Record the proxy rationale. Name the source, factor, period, boundary, unit conversion and assumptions.
- Estimate uncertainty qualitatively or quantitatively where your framework requires it. At minimum, identify the variables most likely to change the result.
- Label the output. Mark it as an industry average, proxy or other estimate—not supplier-measured activity data.
- Plan the replacement. State what record the subcontractor should provide next period and who will request it.
A proxy is suitable for hotspot screening only if its limitations are acceptable for that purpose. It may not be adequate to demonstrate a small supplier-specific reduction. Conversely, rejecting a representative secondary factor solely because it is not supplier-specific can make the inventory less reliable.
What should a correction and audit trail contain?
Use a versioned record that lets another person reproduce the number without searching through email. At minimum, retain:
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- original submitted value and file name or record location;
- corrected value and the date of correction;
- activity description, original unit and any conversion;
- organizational, operational and life-cycle boundary;
- data type: measured activity, supplier-calculated emissions, industry average or proxy;
- emission-factor source, factor year or version and GWP basis where applicable;
- assumptions, allocation rule, inclusions and exclusions;
- evidence reviewed and the reviewer’s conclusion on quality;
- person responsible, approver and any follow-up action; and
- effect on the reported inventory, trend or supplier score, if material.
Keep calculations separate from evidence files but link them with stable identifiers. A correction should never overwrite the original submission: mark the old version as superseded and preserve the reason for the change.
How should construction teams handle confidentiality?
Some subcontractors will not share utility bills, production yields or customer-level records because they contain commercially sensitive information. You can still improve confidence by agreeing what can be redacted, accepting an aggregated site total, using a controlled data room, or asking for a calculation workbook without prices or customer names.
The GHG Protocol notes that confidential information can be protected and that third-party assurance may be considered as an alternative way to support confidence. Confidentiality should limit unnecessary detail, not turn an unsupported number into a “measured” value. Record what was withheld, who reviewed it, and what assurance or alternative evidence was available.
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How should you disclose unresolved gaps?
Report a limitation plainly. State which supplier, activity, period or Scope 3 category is incomplete; explain why the information is unavailable; describe the steps already taken; and give the expected route to improve it. The GRI 102: Climate Change 2025 requirements call for that explanation when information for an applicable Scope 3 category is unavailable or incomplete. Confirm that the framework and reporting period apply to your organisation before relying on a particular disclosure requirement.
Also distinguish the data types in internal schedules and, where relevant, in the published methodology: measured activity data, supplier-calculated emissions, industry averages and proxy estimates. Do not describe a proxy as a subcontractor measurement, and do not imply complete supplier coverage when only a percentage of emissions came from supplier or value-chain partner data.
A useful company-specific metric is the percentage of emissions calculated using data obtained from suppliers or other value-chain partners. It is an inventory result, not a universal target or benchmark; publish the numerator, denominator and boundary so the percentage can be interpreted.
What does a practical repair workflow look like?
- Set the inventory rule. Define organisational, operational and life-cycle boundaries, reporting period, units, factor policy and the purpose of the data.
- Build a supplier-and-activity register. Link subcontractors to projects, sites, materials, services, quantities and likely Scope 3 categories.
- Prioritise. Rank requests by anticipated emissions, spend, influence and decision relevance; begin with material Tier 1 suppliers.
- Issue the standard request. Ask for activity records, method, factor, assumptions, inclusions, exclusions and evidence, with a named contact.
- Log every response. Capture submission date, period, boundary, data type, evidence status and follow-up owner.
- Validate. Check units, period, site, coverage, currency where relevant, activity-versus-emissions status and factor compatibility.
- Reconcile. Investigate conflicting versions with the supplier; never average them without understanding the cause.
- Calculate. Apply a consistent factor and GWP basis, retain intermediate quantities and prevent double counting.
- Fill gaps. Select a representative secondary source or proxy when it is better than the available primary data, and label it.
- Review and approve. Apply documented QA/QC, record corrections and escalate material unresolved issues.
- Disclose. Explain missing information, reasons, actions and expected improvement under the applicable reporting framework.
- Improve the next cycle. Turn recurring errors into clearer contract requirements, supplier guidance and targeted evidence requests.
What do common construction data problems look like?
| Problem | Why it misleads | Repair |
|---|---|---|
| A concrete subcontractor sends tCO2e per cubic metre with no mix, plant or factor information. | The intensity may cover different cement content, production sites or life-cycle stages than the project inventory. | Request delivered quantity, product specification, production site, factor source, boundary and transport treatment; use a matched factor if details remain unavailable. |
| A plant-hire contractor reports fuel bought for its whole fleet. | The total may include other customers, depots or periods. | Request project allocation, meter or telematics records, allocation method and dates; retain the fleet total as supporting evidence only. |
| A haulage subcontractor provides kilometres but no vehicle or load information. | Distance alone does not identify the relevant fuel or freight activity. | Ask for vehicle type, load or tonne-kilometres where available, route period and whether empty returns are included. |
| A waste contractor reports a single emissions figure for collection and treatment. | Stages may overlap with another contractor’s transport or disposal data. | Map each stage, treatment route, waste quantity and factor, then remove overlapping stages from one side. |
| A supplier replaces last year’s measured data with a smoother estimate. | The apparent trend may reflect a method change rather than operational improvement. | Keep both versions, identify the method change and explain any restatement or break in the series. |
| A subcontractor leaves a field blank. | Blank does not mean zero, and treating it as zero understates emissions. | Ask whether the activity is not applicable, genuinely zero, unavailable or pending; record the status explicitly. |
How can procurement and project teams prevent the problem recurring?
Make data quality part of normal supplier management rather than a one-off sustainability chase. Procurement can place the reporting period, units, evidence rights, confidentiality treatment and correction process in tender and contract documents. Project teams can capture quantities, delivery records, plant hours and waste tickets as work happens, instead of reconstructing them after close-out.
Assign clear ownership:
- Commercial or procurement: contract clauses, supplier contacts, confidentiality and escalation.
- Project controls: quantities, delivery records, programme periods and change orders.
- Site management: fuel, plant, waste and operational evidence.
- Carbon or environmental lead: factor policy, boundary decisions, calculations, QA/QC and disclosure.
- Supplier: source records, method explanations, corrections and notice of facility or process changes.
Use a standard questionnaire or an automated online collection system if it reduces transcription and follow-up effort; the GHG Protocol recognises those approaches. Software is optional, however. A controlled template, evidence register and disciplined review can deliver the same core controls.
How do you improve data quality over time?
Track recurring failure modes and convert them into specific improvements. If suppliers repeatedly omit periods, add a date validation field. If factors lack boundaries, make factor source and life-cycle stages mandatory. If project allocations are disputed, define the allocation rule in the contract before work begins.
Review data quality across technology, time and geography, as well as completeness, reliability and traceability. Compare the share of emissions based on supplier or value-chain partner data from one reporting cycle to the next, but interpret the change alongside boundary and methodology changes. A higher share is not automatically better if the new data is less reliable.
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For priority suppliers, agree a progression such as: documented proxy; supplier average with method; site-level activity records; independently reviewed records. The appropriate endpoint depends on the decision the data must support. Keep the improvement plan visible, with an owner and next evidence request, so an unresolved gap is managed rather than forgotten.
What is the final decision rule?
Use the most representative, complete and traceable input that fits the activity and reporting purpose. Prefer checkable activity records when they are available, but use a well-matched secondary source when the supplier’s number is unsupported or has the wrong boundary. Preserve every correction, label every estimate and disclose material gaps. That combination produces a more credible construction carbon inventory than a superficially complete spreadsheet.
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Frequently Asked Questions
Can I combine supplier data with industry averages in one carbon inventory?
Yes. Primary and secondary inputs may be combined when each is assigned to the activity and boundary it actually represents. Keep a field showing the data type and explain the mix so readers can distinguish measured supplier activity from factors or proxies.
Should I ask subcontractors for a carbon intensity or a total footprint?
Ask for the underlying activity quantity first, then request any intensity or total as supporting information. Activity records let you apply one consistent factor policy across suppliers and reveal whether a reported total includes transport, production or other stages.
What should happen when a subcontractor revises a previous year’s number?
Retain the original submission, the revised version and the reason for the change. Assess whether the revision affects a reported trend or material total, then document any restatement or break in comparability rather than silently replacing the old value.
What if a subcontractor refuses to share utility bills because they are confidential?
Agree on redaction, an aggregated site figure or controlled review of the records, and document what was withheld. Where appropriate, consider third-party assurance as an alternative way to increase confidence while keeping commercially sensitive details protected.
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