Carbon isn't a box-ticking exercise in tenders any more — it's scored, and it can be the margin between winning and losing. Here's how to answer the sustainability questions so they earn marks instead of leaking them.
Why carbon is now scored, not just asked
For years, environmental questions in a tender were a formality — write a nice policy, tick the box, move on. That's over. Public buyers now apply the Social Value Model, which includes an explicit "fighting climate change" theme with scored, weighted questions. On top of that, PPN 06/21 makes a Carbon Reduction Plan a pass/fail gate for larger contracts. And main contractors, under pressure from their own clients, are pushing the same expectations down to subcontractors.
The upshot: a weak carbon answer doesn't just look bad — it costs you points in a competition often decided by a few percent.
The questions buyers actually ask
Sustainability sections vary, but they cluster into a handful of themes. Expect to be asked to:
- State your commitment — policy, Net Zero target, governance
- Show you measure — do you actually calculate your emissions, and how?
- Describe your reductions — what specific actions do you take, with what impact?
- Provide evidence — data, certificates, accreditations, a published plan
- Commit to this project — a project-specific carbon plan, not just corporate policy
- Manage your supply chain — how you influence subcontractors and materials
What a winning answer looks like
High-scoring answers share four traits. They are specific, evidenced, quantified, and project-relevant.
- Specific: "We reduced site fuel emissions by switching three generators to HVO" beats "we are committed to reducing emissions."
- Evidenced: reference real figures, a published Carbon Reduction Plan, PAS 2080 alignment, or ISO 14001.
- Quantified: put numbers on it — tonnes of CO₂e saved, percentage reductions, a baseline year.
- Project-relevant: say what you'll do on this contract, with named measures and who's accountable.
The one principle that wins carbon questions: specific beats generic, every time. Assessors read dozens of near-identical "we take sustainability seriously" answers. The bid that names a measure, attaches a number, and points to evidence stands out immediately — and picks up the marks the others leave on the table.
What loses you marks
- Vague commitments with no measurement behind them
- No data — you can't reduce what you don't track, and assessors know it
- Generic corporate policy pasted in with no link to this project
- No evidence — claims with nothing to back them
- Ignoring the supply chain when the question asks about it
- A missing or out-of-date Carbon Reduction Plan where PPN 06/21 applies — often an automatic fail
Evidence that scores
When a question asks for proof, the strongest things to attach or reference are:
| Evidence | What it signals |
|---|---|
| A published Carbon Reduction Plan | PPN 06/21 compliance and a real Net Zero commitment |
| Scope 1/2/3 figures on DEFRA factors | You measure properly, not by guesswork |
| PAS 2080 alignment | A structured, recognised approach to carbon management |
| A named baseline + reduction trend | Genuine improvement over time, not a snapshot |
| ISO 14001 | An audited environmental management system |
The PPN 06/21 pass/fail gate
If the contract falls under PPN 06/21, treat the Carbon Reduction Plan as non-negotiable. It must be compliant, published on your website, and current. No amount of well-written prose elsewhere in the bid rescues a missing or invalid CRP — it's checked first, and it's a gate.
A simple structure for every answer
When you're staring at a carbon question, answer it in four moves:
- Commit — state the relevant policy/target in one line.
- Measure — how you calculate emissions (Scope 1/2/3, DEFRA factors).
- Act — the specific measures you take, with quantified savings.
- Prove — the evidence you can attach (CRP, PAS 2080, ISO 14001, data).
The firms that win on carbon aren't necessarily the greenest — they're the ones who can evidence it. Consistent, project-by-project emissions data is what turns "we care about carbon" into a scored, defensible answer.