PPN 06/21 for Construction: Scope 3 Guide + CRP Checklist 2026

Construction companies face unique challenges when creating a Carbon Reduction Plan for PPN 06/21 compliance. From complex supply chains to embodied carbon in materials, the sector's emissions profile differs significantly from service-based businesses.

This guide covers the specific requirements for construction companies bidding for government contracts, with practical guidance on Scope 3 emissions, subcontractor data, and framework-specific requirements like National Highways.

For a walk-through of the seven mandatory sections of a PPN 006 CRP, see our dedicated structural guide before adapting it to construction.

For the full PPN 006 requirements and a free template download, see our complete PPN 006 Guide.

Why Construction Companies Need a Carbon Reduction Plan

The construction sector is responsible for a significant portion of the UK's carbon emissions — both through operational activities and the embodied carbon in materials. Government and major infrastructure clients are increasingly requiring suppliers to demonstrate carbon reduction commitments.

Key drivers for construction CRPs:

• Contract value threshold: Any bid for contracts over £5 million annually requires a compliant CRP.
• National Highways requirements: Major road and infrastructure contracts have explicit sustainability scoring.
• HS2 and Network Rail: Large rail projects require detailed carbon management plans.
• Local authority frameworks: Many councils now mirror PPN 06/21 requirements in their own procurement.
• Private sector expectations: Major developers increasingly request carbon data from their supply chain.

Scope 3 Categories Most Relevant to Construction

Scope 3 emissions often represent the largest portion of a construction company's carbon footprint. For a complete understanding of all emission scopes, see our carbon footprint guide.

The GHG Protocol defines 15 Scope 3 categories. For construction, the following are typically most material:

• Category 1: Purchased Goods and Services. This is often the largest Scope 3 source for construction. It includes all materials (concrete, steel, timber, aggregates) and subcontractor services. Embodied carbon in materials falls here.
• Category 3: Fuel and Energy-Related Activities. Upstream emissions from fuel production and electricity transmission/distribution losses not captured in Scope 1 or 2.
• Category 4: Upstream Transportation and Distribution. Materials delivery to site when using third-party logistics. Significant for companies sourcing materials from suppliers who handle their own delivery.
• Category 5: Waste Generated in Operations. Site waste including construction and demolition waste, packaging, and office waste. Covers the emissions from waste treatment and disposal.
• Category 6: Business Travel. Travel in vehicles not owned by the company, flights, rail, and hotels. Site visits in personal vehicles or hire cars fall here.
• Category 7: Employee Commuting. Staff travel to offices and sites. Construction often has high commuting emissions due to site locations away from public transport.

Note: PPN 06/21 does not require reporting on all 15 Scope 3 categories. You must report on categories relevant to your operations and can exclude categories with justification. However, for construction, omitting Category 1 (materials and subcontractors) would be difficult to justify.

Handling Subcontractor Emissions

Subcontractor emissions are one of the most challenging aspects of construction carbon reporting. The approach depends on your contractual relationship and operational control.

Subcontractors count as Scope 3 when:

• You procure their services (they bring their own equipment, fuel, and labour).
• They invoice you for completed work.
• They have operational control over their activities.

Subcontractors may count as Scope 1 or 2 when:

• They use your fuel (for example, site diesel from your account).
• They use your equipment.
• You have operational control over their activities.

Practical approaches to data gathering:

• Supplier engagement: Request carbon data or fuel usage from key subcontractors. Large subcontractors may have their own CRPs.
• Spend-based estimation: Use industry emission factors based on procurement spend (for example, £ spent on groundworks multiplied by a sector emission factor). This is acceptable for initial reporting.
• Contract clauses: Add carbon data requirements to future subcontract terms.
• Focus on materiality: Prioritise data collection from your largest subcontractors by spend or expected emissions.

Embodied Carbon vs Operational Carbon

Understanding the distinction between embodied and operational carbon helps clarify what falls within your Carbon Reduction Plan.

Embodied carbon refers to the emissions associated with manufacturing, transporting, and installing materials — the carbon "embedded" in a building before it's occupied. For a construction company, this primarily falls under Scope 3 Category 1 (Purchased Goods and Services).

Operational carbon refers to emissions from the use of a building — heating, cooling, lighting, and appliances. This is typically the responsibility of the building owner or occupier, not the construction company.

For construction companies, your CRP focuses on:

• Scope 1: Fuel used in company vehicles and on-site plant and equipment.
• Scope 2: Electricity in offices and any site compounds.
• Scope 3: Materials procurement, waste, subcontractors, business travel, and commuting.

Note: Some clients (particularly in infrastructure) may request whole-life carbon assessments that include operational carbon of the asset being built. This is separate from your organisational CRP required by PPN 06/21. If your organisation also falls under SECR requirements, see our SECR Reporting Requirements Guide for how the two frameworks interact.

Common Mistakes in Construction CRPs

We see several recurring errors when reviewing Carbon Reduction Plans from construction companies:

• Ignoring materials: Excluding Scope 3 Category 1 entirely. For construction, materials and subcontractors are typically material emissions sources. Excluding them without strong justification weakens your CRP.
• Treating all subcontractors as out of scope: While subcontractor emissions can be complex to calculate, dismissing them entirely is not compliant. Use spend-based estimation if primary data isn't available.
• Using only Scope 1 and 2: PPN 06/21 explicitly requires Scope 3 emissions to be addressed. A CRP with only fleet fuel and office electricity will not be accepted.
• No reduction targets: Listing current emissions without setting reduction targets. Your CRP must include a commitment to Net Zero by 2050 and ideally interim targets.
• Unsigned or unpublished: The CRP must be signed by a director and published on your website. Missing signatures or password-protected documents are common rejection reasons.
• Outdated data: Using emissions data more than 12 months old. Your CRP should be based on the most recent complete reporting period.

For a full list of compliance requirements, see our complete PPN 006 guide.

How to Gather Construction Emissions Data

Effective data collection is the foundation of an accurate CRP. For construction companies, key data sources include:

Scope 1 (direct emissions):

• Company vehicle fuel records (litres of diesel, petrol).
• Site plant and equipment fuel (generators, excavators, forklifts).
• Gas for heating offices or welfare facilities.

Scope 2 (electricity):

• Office electricity bills (kWh).
• Site compound electricity (if metered separately).

Scope 3:

• Materials: Procurement data (tonnes or £ spend) for concrete, steel, timber, and other key materials.
• Subcontractors: Annual spend by category or fuel data if available.
• Waste: Skip manifests, waste transfer notes, recycling records.
• Business travel: Expense claims, mileage logs, flight bookings.
• Commuting: Employee survey or postcode analysis.

Note: Start with what you have. Spend-based estimates using emission factors from sources like DEFRA or the GHG Protocol are acceptable where primary data isn't available. You can improve data quality in future reporting years. Construction supply chains are notoriously fragmented — our carbon consulting team specialises in building credible Scope 3 baselines from limited data.

Typical Timeline for Construction CRP

How long does it take to create a compliant Carbon Reduction Plan? Here is a realistic timeline for construction companies:

1. Weeks 1–2: Data Gathering. Collect fuel records, utility bills, procurement data, and waste manifests. Send data requests to key subcontractors.
2. Weeks 2–3: Emissions Calculation. Apply emission factors to activity data. Calculate Scope 1, 2, and relevant Scope 3 categories. Identify data gaps and apply estimation methods.
3. Weeks 3–4: Reduction Planning. Set baseline year, define Net Zero target, develop specific reduction measures for your operations. Consider fleet electrification, material specifications, and supply chain engagement.
4. Week 4: Document and Publish. Format using the government template, obtain director signature, publish on company website. Ensure document is publicly accessible.

Note: Companies with limited data or complex supply chains may need 6–8 weeks. If you have a tender deadline, start early — chasing subcontractor data often takes longer than expected.

National Highways and Major Framework Requirements

Major infrastructure clients have requirements beyond baseline PPN 06/21 compliance.

National Highways:

• Compliant PPN 06/21 Carbon Reduction Plan required for contracts over £5 million.
• Carbon management is a scored element in tender evaluation.
• Project-level carbon reporting often required during delivery.
• Expectations around carbon reduction in construction methodology.

Network Rail:

• PPN 06/21 compliance required.
• Additional sustainability assessments for larger frameworks.
• Carbon data requested during pre-qualification.

HS2:

• Stringent carbon requirements including whole-life carbon assessments.
• Carbon budgets allocated to work packages.
• Detailed carbon management plans required.

Your organisational CRP is the entry point. Demonstrating that you understand your emissions and have reduction plans in place positions you well for framework applications where sustainability is scored.