--- title: "Scope 1, 2 and 3 Emissions in Construction: A Plain-English Guide" description: What Scope 1, 2 and 3 emissions mean for construction firms, why Scope 3 dominates a project's footprint, and how it maps to SECR and PPN 06/21. metaTitle: "Scope 1, 2 and 3 Emissions in Construction" category: Fundamentals date: 2026-07-18 dateModified: 2026-08-24 readingTime: 6 min read lead: Every carbon framework you'll meet — SECR, PPN 06/21, PAS 2080 — is built on the same three-part split. Get Scope 1, 2 and 3 clear once and the rest gets much easier. cardDescription: What each scope covers, which site activities fall where, why Scope 3 usually dominates a project's footprint, and how the scopes map to SECR, PPN 06/21 and PAS 2080. ctaHeading: Track Scope 1, 2 & 3 automatically ctaBody: VerdCore splits every fuel, materials, transport and waste entry into the right scope using DEFRA factors — so your Scope 1/2/3 breakdown is always ready for a tender. footerNote: This guide is general information, not compliance advice. Scope definitions follow the GHG Protocol Corporate Standard; always calculate with the current DEFRA conversion factors. ogTitle: Scope 1, 2 and 3 Emissions in Construction Explained ogDescription: What each scope means, which site activities fall where, why Scope 3 dominates, and how the scopes map to UK reporting frameworks. faq: - q: What is the difference between Scope 1, 2 and 3 emissions? a: Scope 1 is emissions you burn directly, such as site diesel and plant. Scope 2 is emissions from purchased energy such as grid electricity. Scope 3 is everything else in your value chain, including materials, transport and waste. - q: Why does Scope 3 dominate construction emissions? a: Scope 3 is typically 70 to 90 percent of a construction project's total footprint, driven overwhelmingly by the embodied carbon of materials such as concrete, steel and timber. - q: How do Scope 1, 2 and 3 map to UK reporting frameworks? a: SECR requires Scope 1 and 2 in full plus partial Scope 3. PPN 06/21 requires Scope 1, 2 and five defined Scope 3 categories. PAS 2080 covers whole-life carbon across all scopes. - q: What is the quickest way to tell which scope an emission falls into? a: Ask whether you burned a fuel directly, which is Scope 1, whether you bought energy someone else generated, which is Scope 2, or whether it sits elsewhere in your supply chain, which is Scope 3. --- ## Where do the three scopes come from The idea of "scopes" comes from the [**Greenhouse Gas (GHG) Protocol Corporate Standard**](https://ghgprotocol.org/corporate-standard), the world's most widely used carbon accounting standard. It splits an organisation's emissions into three groups based on **who controls the source,** which is what makes reporting consistent and comparable. Every UK framework a contractor meets, **SECR**, **PPN 006/21, and PAS 2080,** uses this same Scope 1/2/3 structure. Learn it once, and you've learned the backbone of all of them. ## Scope 1 — emissions you burn directly **Scope 1** covers **direct emissions from sources you own or control.** On a construction site that's mostly combustion, you can see and smell the following: * Red diesel and diesel in excavators, telehandlers, dumpers and generators * Gas or oil heating in site cabins and offices * Fuel in company-owned vans and vehicles * Any on-site process that burns fuel If you're burning it yourself, it's almost always Scope 1. ## Scope 2 — the energy you buy **Scope 2** covers **indirect emissions from purchased energy**. You didn't burn it, but it was generated on your behalf: * **Grid electricity** for site hoarding, tower cranes, welfare units and offices * Purchased heat or steam (rare on most sites) Because the power station burnt the fuel, not you, it sits in Scope 2 rather than Scope 1, but it's still your responsibility to report. > **Quick test.** Ask "did we burn a fuel directly?" If yes → **Scope 1**. "Did we buy energy someone else generated?" → **Scope 2**. "Is it anywhere else in our supply chain?" → **Scope 3**. ## Scope 3 — everything else in your value chain **Scope 3** covers **all other indirect emissions** — upstream and downstream of your operations. For construction, this is the big one, and it usually includes: * **[Embodied carbon](/resources/embodied-vs-operational-carbon.html) in materials** — concrete, steel, timber, insulation, plasterboard. This is typically the single largest category on a project. * **Transport and logistics** — deliveries of materials and plant to site, and haulage away. * **Subcontractor activities** and hired plant you don't own. * **Waste** generated on site and its disposal route. * **Business travel** and **employee commuting**.
The three scopes at a glance
Scope 1 — Direct
Site diesel, plant, generators, gas heating, company vehicles — anything you burn yourself.
Scope 2 — Energy
Grid electricity for site hoarding, cranes and welfare units — generated on your behalf.
Scope 3 — Value chain
Materials, transport, subcontractors, waste — usually 70–90% of the total footprint.
## Why Scope 3 dominates construction Here's the point most people miss: for a typical construction project, **Scope 3 is by far the largest share of the footprint,** often **70–90% of total emissions**, driven overwhelmingly by the **embodied carbon of materials**. That has a practical consequence. A firm that reports only Scope 1 and 2, its site diesel and electricity, is measuring the small end of its impact and ignoring the part clients increasingly ask about. Specifying lower-carbon concrete or steel, or cutting delivery miles, usually moves the number far more than switching a generator. ## How the scopes map to UK frameworks | Framework | What it asks for | | ------------- | ---------------------------------------------------------------------------------------------------------------------------- | | **[SECR](/resources/secr-explained.html)** | Scope 1 and Scope 2 in full; Scope 3 partially (at minimum, business travel in owned/leased vehicles). | | **[PPN 06/21](/resources/ppn-06-21-explained.html)** | Scope 1, Scope 2, plus five defined Scope 3 categories (business travel, commuting, upstream & downstream transport, waste). | | **[PAS 2080](/resources/pas-2080-for-contractors.html)** | Whole-life carbon across all scopes: capital (embodied), operational and end-of-life. | The common thread: they all start from Scope 1, 2 and 3. If your project data is already split that way, producing any of these reports becomes a formatting exercise rather than a data-gathering scramble. ## How to get the split right 1. **Capture activity data** — litres of fuel, kWh of electricity, tonnes of material, delivery distances, tonnes of waste. 2. **Apply the current DEFRA conversion factors** to turn each into kg CO₂e. 3. **Assign each entry to a scope** using the tests above. 4. **Report against a baseline** so you can show reduction over time, not just a single snapshot. The hard part is rarely the definitions; it's capturing the activity data consistently, site after site, so the numbers are ready the moment a tender or a client asks for them — whether that's a [Carbon Reduction Plan](/resources/how-to-write-a-carbon-reduction-plan.html) or a scored answer in [a tender response](/resources/winning-construction-tenders-on-carbon.html). VerdCore's [construction carbon reporting software](/construction-carbon-reporting-software.html) automates exactly that.