Most material manufacturers don’t get told why they’ve lost a contract.
And for those supplying into construction, that’s becoming more common.
There’s no email that says:
“You didn’t make the shortlist because of your carbon reporting.”
Instead, it shows up in quieter ways:
- You stop getting invited to tender
- You score lower during supplier pre-qualification
- You don’t make it onto approved supplier lists
From the outside, it just looks like competition is getting tougher.
But behind the scenes, something more specific is changing.
Buyers are starting to favour suppliers who can clearly demonstrate their carbon impact
And if you can’t provide that clarity, you’re becoming harder to choose.
Why Carbon Reporting Is Changing Procurement in Construction
Over the past few years, something has shifted in how construction projects are evaluated.
It’s no longer just about cost, quality, and delivery.
There’s now a fourth factor sitting alongside them: carbon.
Contractors and developers are under increasing pressure to reduce the embodied carbon of materials. In simple terms, the emissions linked to what goes into a building before it’s even used.
And they can’t do that without understanding the impact of the products they’re buying.
That’s why more and more companies supplying into construction are being asked for things like:
- Carbon emissions data (often starting with Scope 1 and Scope 2, and increasingly Scope 3 categories)
- Environmental Product Declarations (EPDs) for specific products
- Carbon reduction plans, especially for public sector work
- Answers to sustainability questions during procurement
This isn’t coming from one single regulation. It’s being driven by a mix of government targets, industry frameworks like BREEAM, and internal changes within procurement teams.
The result is the same: Sustainability is now part of how suppliers are assessed, scored, and selected
Buyer Expectations Are Driving Carbon Disclosure in Procurement
A lot of businesses assume this only matters if they’re legally required to report carbon.
In reality, that’s not how it plays out.
You might not fall under schemes like Streamlined Energy and Carbon Reporting (SECR). You might not need to complete ESOS Phase 3. You might be well below the thresholds for mandatory reporting.
But procurement doesn’t work on legal minimums–it works on what buyers need.
Contractors bidding for major projects (especially public sector work) are often required to show how they’re reducing emissions across their entire supply chain. That includes the materials they use.
So the question they’re asking isn’t:
“Do you have to report?”
It’s:
“Can you give us the data we need?”
If the answer is unclear, incomplete, or inconsistent, that becomes a commercial risk, regardless of your legal obligations.
How Construction Suppliers Are Being Assessed on Carbon Data
This is where things become less visible, but more important.
Most procurement processes now include some form of sustainability assessment. You’ll see it in:
- Supplier pre-qualification questionnaires
- Tender sustainability criteria
- Internal scoring systems
- Approved supplier list reviews
You don’t need to fail outright to lose work.
Instead, decisions are made on relative strength.
One supplier provides a clear breakdown of their emissions.
Another includes Environmental Product Declarations for key products.
Someone else has a structured carbon reduction plan ready to go.
If your response is less clear–or harder to interpret–you’re simply less competitive.
And over time, that gap starts to show in fewer opportunities.
What Construction Buyers Now Require for Carbon Reporting (Scope 1, 2 & 3, EPDs)
While requirements vary depending on the project, the direction of travel is clear.
At a minimum, suppliers are expected to understand their own emissions. That usually starts with:
- Scope 1 emissions (fuel used on-site, company vehicles)
- Scope 2 emissions (electricity used in production)
These are typically calculated using recognised approaches like the GHG Protocol, supported by UK Government conversion factors.
Beyond that, expectations are expanding.
Buyers are increasingly asking for:
- Visibility over parts of Scope 3 (such as raw materials and upstream transport)
- Product-level data through Environmental Product Declarations (EPDs), aligned with standards like EN 15804+A2
- Carbon reduction plans, particularly for public sector tenders under PPN 06/21
- Supporting data for sustainability assessments like BREEAM
This doesn’t need to be overly technical—but it does need to be structured and credible.
Why Material Manufacturers Are Under More Pressure
Material manufacturers are feeling this shift more than most.
That’s because a large share of a building’s carbon footprint comes from the materials used to construct it. Concrete, steel, insulation, aggregates–these all carry significant embodied carbon.
So when contractors look to reduce their impact, they look upstream.
For manufacturers, that brings attention to areas like:
- Energy-intensive production (kilns, furnaces, heavy machinery)
- Electricity usage across facilities
- Emissions linked to raw materials and upstream transport
- Waste and byproducts from production
In many cases, this data already exists within the business, it’s just not being used in this way yet.
The shift isn’t about starting from scratch. It’s about turning what you already have into something usable in a commercial context.
The Risk Builds Gradually, Not All at Once
One of the reasons this catches companies off guard is that it doesn’t happen overnight.
You don’t suddenly lose all your customers.
Instead, it shows up in smaller ways:
- A framework opportunity you don’t quite make
- A tender where your score drops slightly
- A buyer asking more detailed questions than before
On their own, these don’t always feel significant.
But over time, they add up.
And by the time it becomes obvious, other suppliers have already moved ahead.
How UK Suppliers Can Prepare for Carbon Reporting Requirements in 2026
The biggest mistake companies make is assuming they need to build something complex straight away.
In reality, what buyers are looking for at this stage is clarity.
A good starting point is to understand the data you already have. Most manufacturers are already tracking energy usage, fuel consumption, and operational activity–it just hasn’t been pulled together in a way that tells a carbon story.
From there, you can build a simple emissions baseline. Using recognised frameworks like the GHG Protocol, alongside UK Government conversion factors, is enough to get started.
The next step is understanding what your customers actually expect. Are they asking for EPDs? Are sustainability questions becoming more common in tenders? This helps you focus your efforts.
With that clarity, you can put a straightforward plan in place—whether that’s improving energy efficiency, reducing waste, or preparing a basic carbon reduction plan.
Finally, it’s about being able to communicate what you’ve done. Whether through a supplier questionnaire or a tender submission, clarity is what makes the difference.
👉 For a full breakdown of carbon reporting, what you need to measure, and how it applies to companies supplying into construction, see our main guide:
Carbon Reporting for UK Building Material Companies: What You Need in 2026
How Switch2Zero Can Help
If you’re unsure where you stand—or what’s actually required—we offer a free, no-obligation consultation.
We’ll help you quickly understand:
- Whether you’re at risk
- What buyers are likely to expect
- What’s worth doing next (and what isn’t)
No jargon. No hard sell. Just practical clarity.
Book your free consultation and get a clear next step.
Already Calculated Your Footprint?
If you’ve already done the work—whether partially or in full—but want a second set of eyes to sense-check it, there’s a simpler next step.
We offer a fast, low-cost carbon footprint verification service.
Simply create a free account on our website and upload your emissions data (spreadsheets, PDFs, notes, whatever you have). Our team will review and verify your footprint across Scope 1, 2, and 3.
Once verified, you’ll have:
- Data you can confidently share with customers and in tenders
- Greater trust with stakeholders and procurement teams
- A clear foundation to build on (whether that’s reduction planning or carbon neutrality)
It’s a straightforward way to move from “we think this is right” to “we know this stands up.”
