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Carbon credentials for tenders

When a tender asks about carbon, it is almost always asking three things: what your emissions are, what you are doing to reduce them, and who other than you has checked. Answer those three with evidence and the same body of work serves every bid you write, rather than each one starting again.

What a buyer is actually asking for

A measured footprint. Scope 1 and 2 at minimum, and increasingly the scope 3 categories that matter to your business - because for most suppliers the majority of the footprint sits in purchased goods and services, and a buyer who knows that reads a scope 1 and 2 only answer as an incomplete one.

A reduction plan. For UK central government contracts above the published threshold this is a formal Carbon Reduction Plan under PPN 006. For everyone else it is the same document without the policy note: targets, interventions, owners, dates. See Carbon Reduction Plan for PPN 006.

Independent verification. This is the part that separates a submission from a claim. A self-declared figure asks the evaluator to take your word for it; an independently verified one does not. It is also the cheapest thing to get wrong, because a confident unverified number can be challenged and a challenged number damages the whole submission.

Which NCZ level answers which ask

The four levels stack, so the work done for one is the starting point for the next.

  • Blue Award, free. Sign-up to the NCZ platform and a modelled emissions estimate built from the NCZ company questionnaire and benchmark framework. Enough to answer that you have started and to know roughly where you stand.
  • Silver Award, £1,500 a year. A questionnaire-based scope 1, 2 and 3 carbon footprint report, independently verified. This is the level that answers most private-sector tender questions in full.
  • Gold Certification, £4,500 a year. All company emissions measured through the NCZ data collection portal with weekly support from the customer success team, producing an ISO 14064 compliant carbon footprint report with a full emissions breakdown, plus access to the NCZ preferred supplier directory. This is the level to reach for when the buyer names a standard.
  • Platinum Certification, £7,500 a year. Everything in Gold, plus the supplier carbon collection assessment tool, a supplier emissions breakdown report, at least 10% of supplier emissions measured with engagement increasing year on year, and demonstrated reductions against intensity metrics. This is the level that answers a scope 3 question about your own supply chain.

Every level produces certificates and media packs, so the achievement is something you can attach to a submission, put on a website and give to a client.

Why intensity metrics matter in a bid

A total emissions figure falls when a business shrinks, which makes it a weak thing to be judged on and a weak thing to claim. Platinum Certification is assessed on demonstrated reductions against intensity metrics - emissions per unit of the thing your business actually does - which is both a truer measure of progress and the only one a buyer can use to compare two suppliers of different sizes.

It is evidence, and evidence exists

The case studies carry the figures rather than describing them. Corps Security measured 476.15 tCO2e and holds Silver. BELFOR UK measured 2,261.55 tCO2e across Silver and Gold, with a 10% reduction from 2021 to 2022. Kings Norton Golf Club measured 671 tCO2e and holds Gold, alongside a saving of £100k per annum. Read the case studies.

Where to read more

Four articles go further on the tender argument itself: what a carbon neutral tender is, how carbon neutrality separates you from competitors, how it benefits a tender proposal, and elevating a submission with NCZ. On the buyer's side of the table, procurement leaders and scope 3.

Last reviewed: September 2026

Your questions, answered

What do buyers ask for about carbon in a tender?

Almost every carbon question in a tender is one of three things: what your emissions are, what you are doing to reduce them, and who other than you has checked.

A measured footprint means scope 1 and scope 2 at minimum, and increasingly the scope 3 categories that matter to your business. That last part is where answers fall down: for most suppliers the majority of the footprint sits in purchased goods and services, and a buyer who knows that reads a scope 1 and 2 only response as an incomplete one.

A reduction plan means targets, interventions, owners and dates. For UK central government contracts above the published threshold it takes the formal shape of a Carbon Reduction Plan under PPN 006; for everyone else it is the same document without the policy note behind it.

Independent verification is the part that separates a submission from a claim. A self-declared figure asks the evaluator to take your word for it. It is also the cheapest thing to get wrong, because an unverified number can be challenged and a challenged number damages the whole submission. Every NCZ level above the free Blue Award includes independent verification that internationally recognised calculation and reporting standards have been met.

Last reviewed: September 2026

Which NCZ level do I need to answer a tender?

It depends on what the buyer asked, and the four levels stack, so the work done for one is the starting point for the next rather than an exercise repeated from scratch.

The Blue Award is free: platform sign-up and a modelled emissions estimate from the NCZ company questionnaire and benchmark framework. It answers that you have started and tells you roughly where you stand. The Silver Award, £1,500 a year, produces a questionnaire-based scope 1, 2 and 3 carbon footprint report with independent verification, and it answers most private-sector tender questions in full.

Gold Certification, £4,500 a year, measures all company emissions through the NCZ data collection portal with weekly support from the customer success team and produces an ISO 14064 compliant carbon footprint report with a full emissions breakdown. Reach for it when the buyer names a standard, because that is the level that produces a document in the form they named.

Platinum Certification, £7,500 a year, adds the supplier carbon collection assessment tool, a supplier emissions breakdown report, at least 10% of supplier emissions measured with engagement increasing year on year, and demonstrated reductions against intensity metrics. It is the level that answers a scope 3 question about your own supply chain, and the only one assessed on intensity rather than on a total.

Last reviewed: September 2026

How long does it take to get carbon credentials for a tender?

Longer than a bid window, which is the honest answer and the useful one. A measured carbon footprint depends on data you have to collect - energy, fuel, fleet, travel, and for scope 3 the suppliers who have to answer you in turn. None of that compresses well, and a figure produced in a hurry is the kind that gets challenged.

The practical route is to start before you need it. The Blue Award is free and gives you a modelled estimate from a company questionnaire, which is something to say while the measured work runs. The Silver Award produces a questionnaire-based scope 1, 2 and 3 report. Gold measures all company emissions through the NCZ data collection portal, with weekly assistance from the customer success team - that weekly cadence exists because data quality is where the time goes.

Platinum extends into the supply chain, which is the longest of the four because it depends on other organisations' reporting rather than your own, and the standard it is held to is engagement increasing year on year.

Because the levels stack, starting at Blue is not wasted work when the requirement arrives: it is the first stage of the same programme. NCZ's customer success team scopes the work with you, so the realistic date is something to ask about rather than to estimate from a page.

Last reviewed: September 2026