Carbon Reduction Plan: consultant vs software

Strip away the marketing and the two routes offer different things. A consultant is a done-for-you service: you hand over your bills, invoices and a few conversations, and an expert builds the plan, chooses the boundary, sanity-checks the numbers and can defend the methodology if a buyer queries it. You are paying for expertise, for having the work taken off your desk, and for the credibility of a named specialist standing behind the document.

Software such as CarbonPass is self-serve: you upload the same bills, answer a few guided questions, and the platform extracts the activity data, applies the current DEFRA factors and generates a plan in the official template structure — usually in about 20 minutes, for a fixed price from £199. You are paying for speed, for a predictable cost, and for keeping control of the document, at the trade-off of doing a little of the data entry yourself.

Crucially, the finished plan can be identical in what it contains. As our guide on whether CRP generators are accepted sets out, an assessor works from a content checklist — template structure, Scope 1, 2 and the five mandatory Scope 3 categories, methodology, a Net Zero commitment, director sign-off and publication — and never asks who drafted it. So the decision is not about which route is "allowed". It is about which route fits your situation.

A consultant earns their fee when the plan is genuinely hard to build, or when the stakes are high enough that expert assurance is worth the premium. Choose a consultant when:

• Your data is messy or incomplete. Missing bills, multiple sites, a fleet, or a year of records scattered across systems — an expert can reconstruct a defensible boundary and baseline where software would need clean inputs to work from.
• Your Scope 3 is complex. If your value-chain emissions are large, unusual, or heavily spend-based, a consultant can make the judgement calls on categorisation and estimation that a straightforward SME never has to face.
• You want science-based targets. Going beyond the PPN 006 minimum — validated SBTi targets, a detailed decarbonisation pathway — is expert territory, not a self-serve task.
• You have no time or expertise in-house. If nobody on your team can spare the hours or has the confidence to own the numbers, paying to have it done for you is a rational trade.
• It is a high-value or closely scrutinised bid. On a large central-government or NHS framework where a bid team will read the plan carefully, the assurance of a named expert who can defend every figure can be worth the cost.

The NHS is a common trigger for this question, so it is worth being precise about what it actually requires. Since April 2024, NHS England applies a carbon requirement to all new procurements proportionately: a full PPN 006 Carbon Reduction Plan is expected for contracts and frameworks worth £5m a year or more, while a lighter Net Zero Commitment is accepted below that threshold. From 2027, NHS suppliers' Carbon Reduction Plans should commit to net zero by 2045 rather than 2050. So an NHS bid does not automatically mean you need a consultant — it means you should match the effort to what the specific procurement asks for, and a large framework bid is exactly the kind of high-value, high-scrutiny case where expert help can pay off.

For a large share of SMEs, a consultant is buying capability you do not need. Software does the same compliance job when:

• Your operations are straightforward. A single site or a small number of sites, typical energy use, and no unusual emissions sources — the situation the official template was designed around.
• You have your bills. Twelve months of gas, electricity and fuel bills, plus a rough handle on business travel and commuting, is enough for software to build the whole plan.
• You just need a compliant plan for a tender. Your goal is to clear the PPN 006 pass/fail gate on time, not to run a full carbon-management programme — a compliant plan in the right format is all the tender requires.
• You bid regularly and want a fixed, low cost. Software includes the annual refresh in the subscription, so you are not paying a fresh consultancy fee every time the plan needs updating.

In this case the £199 route produces a document an assessor treats identically to a consultant's — same template, same five Scope 3 categories, same DEFRA factors — because, again, acceptance is about content, not authorship. If you want the reassurance of a human read before you submit, an optional completion check adds a second pair of eyes at a fraction of consultancy cost. For a full breakdown of the government template these plans are built to, see our Carbon Reduction Plan template guide.

Neither route is strictly better; they trade off along a few axes. Here is the fair comparison, so you can weigh what matters to you.

The one trade-off that is not real is acceptance: a compliant plan passes either way. The genuine trade-offs are cost, speed, control, the recurring nature of updates, and how much you value an expert who can stand behind the numbers. Our CRP cost guide sets out the pounds-and-hours picture in more depth, including the DIY government-template route.

If you want a quick way to settle it, run down these two lists and see which one you nod along to more often.

Choose a consultant if…

• Your data is incomplete, spread across sites, or includes a fleet
• Your Scope 3 is large, unusual or heavily spend-based
• You want validated science-based targets or a detailed pathway
• Nobody in-house has the time or confidence to own the numbers
• It is a high-value or heavily scrutinised bid where expert assurance pays for itself

Choose software if…

• Your operations are straightforward — one or a few sites, typical energy use
• You have your last 12 months of bills to hand
• You just need a compliant plan to clear a tender's pass/fail gate
• You bid regularly and want a fixed, low cost with the annual update included
• You are happy to do a little guided data entry to keep control of the document

And if you are on the fence, you do not have to choose forever. Many SMEs start with software to hit a deadline for a fixed cost, then bring in a consultant only for their largest bids or when they move to science-based targets — the plan is a structured document either way, so an expert can extend what the software produced rather than start over.

Is a £199 software CRP accepted like a consultant’s?

Yes. Procurement teams assess a Carbon Reduction Plan against the content requirements of the PPN 006 technical standard — the official template structure, Scope 1, 2 and the five mandatory Scope 3 categories, GHG Protocol methodology with current DEFRA factors, a Net Zero commitment, director sign-off and website publication — not against who or what produced the document. A compliant software-generated plan sits on exactly the same footing as a consultant’s. See our guide on whether CRP generators are accepted at /guides/are-crp-generators-accepted for the detail.

How much do CRP consultants charge?

Typically £1,700 to £4,200 plus VAT as a one-off, though quotes vary widely with your headcount, number of sites and how complex your Scope 3 data is. A small single-site service business sits at the lower end; a larger operation with fleet vehicles, multiple sites and difficult supply-chain data sits at the upper end. Remember that PPN 006 requires an annual refresh, so a consultant fee recurs each year you go back to them.

Can I start with software and hire a consultant later?

Yes, and many bid-heavy SMEs do exactly that. You can generate a compliant plan with software to meet an immediate tender deadline for a fixed low cost, then bring in a consultant for your largest or most scrutinised bids, or when you move to science-based targets. Because the plan is a structured document built to the same standard either way, a consultant can pick up and extend what the software produced rather than starting from scratch.

Do consultants guarantee my bid wins?

No. No reputable consultant can guarantee a contract award, and neither can any software. A Carbon Reduction Plan is assessed as a pass/fail compliance gate under PPN 006 — a compliant plan lets your bid be scored, but the award decision rests with the buyer against the whole tender, including price and quality. A consultant can improve the quality and defensibility of the plan; they cannot promise the outcome.