What does the CO₂ Performance Ladder cost in 2026?

What exactly are you paying for?

Four items: the contribution to SKAO, the audit by an accredited certification body (certificerende instelling), your own hours, and optionally a consultancy. Only the first is fully published. The "source" column matters because SKAO's figures and consultancy figures cover different things.

Note that last row. Massure states that these amounts "zijn inclusief audit en certificering, maar exclusief implementatie". Quoting that band as a total price budgets away the largest item.

Which definition of size applies: turnover, FTE or emissions?

Two definitions of size drive two different bills, and handbook 4.0 rewrote the second.

Your SKAO contribution depends only on annual turnover. SKAO states on its costs page that this breakdown into company sizes serves solely to set the annual contribution and has no connection to the company sizes used in the handbook.

Your number of audit days depends on organisation size as the handbook defines it, and that test changed with 4.0. SKAO's change list comparing 4.0 to 3.1 states: "De omvang wordt niet meer bepaald op basis van scope 1 en 2 uitstoot, maar op basis van FTE, jaaromzet en balanstotaal; dezelfde criteria die voor de CSRD gehanteerd worden." Size is now set by FTE, turnover and balance sheet total, the CSRD criteria, and no longer by scope 1 and 2 emissions.

Handbook 4.0, paragraph 4.2, puts numbers on it: an organisation is small if it met at least two of three conditions last year, a headcount of 250 FTE or fewer, turnover of 50 million euro or less, and a balance sheet total of 25 million euro or less. Anything else is large. There is no middle category.

So turnover does count towards your audit days under 4.0. SKAO notes in the same change list that fewer organisations now qualify as small: a company that counted as small on tonnage under 3.1 can be large under 4.0.

What do you pay SKAO each year?

2026 rates for companies. These classes set the contribution only and say nothing about your audit days.

The Dutch and Belgian cost pages list €800 for the medium to large class, SKAO's English page €799. Negligible, but now you know why you see two numbers. Public and semi-public bodies fall outside this table entirely: SKAO asks those organisations to get in touch for their contribution. No published scale for public authorities exists.

For groups, a company including its subsidiaries never pays more than €6,000 a year in total. So for a group with dozens of legal entities the contribution is not a meaningful cost. The consolidation work around it is: see organisational boundaries for groups with multiple entities.

What does the certification body charge?

Certification bodies do not publish rates. SKAO does publish the audit day table (auditdagentabel), version 1.0 for handbook 4.0, dated 17 February 2025.

Read the two assumptions printed under that table, because they decide whether it applies to you. It assumes the organisation "bestaat uit één entiteit en is gevestigd op één locatie/adres", one entity at one location, and that it is already certified to ISO 50001, ISO 14001 or ISO 9001. Missing that certificate increases the number of days, as do complexity, multiple sites and energy streams. Downward deviation is capped at 30 percent.

There are two columns. If you consider yourself medium sized, there is no column for you and no intermediate value. An annual surveillance audit runs at a minimum of 75% of the net initial audit, with a floor of one audit day of eight hours.

Cresco Consultancy reports certification bodies charging roughly €1,100 per person day and others charging roughly €1,600. That is a consultancy figure, not an SKAO figure:

Treat that as a floor: it holds for one entity at one location with an ISO certificate, and travel and reporting come on top. Ask several accredited certification bodies for quotes, because there are fifteen and the gap between €1,100 and €1,600 a day is over 45%.

How many internal hours does it take?

SKAO's own Practical Guide gives 100 to 200 hours for implementation, optionally with part done by a consultant, then two items of 40 hours a year: managing the reduction process, and monitoring and communication.

Those figures describe one trajectory: "Voor het traject naar niveau 3 ... kunt u na 3 tot 4 maanden het CO2-bewust Certificaat hebben." That is the route to level 3 under handbook 3.1, in 3 to 4 months in house with an employee experienced in ISO 9001, and level 3 is roughly Step 1 under 4.0. The guide dates from June 2020 and uses a €245 contribution from 2021, so its amounts are out of date.

The €3,000 to €4,000 in the guide sits above the €2,200 to €3,200 the audit day table produces for a small organisation at Step 1, and that is consistent: the guide figure also covers reporting and issuing the certificate.

At 150 hours and a loaded internal rate of €75, that is €11,250 of internal effort against an audit invoice of roughly €3,000.

A consultant is not mandatory. Cresco Consultancy puts hourly rates at roughly €120 to €160. For Step 1, scope 1 and 2 only, you rarely buy anything you could not produce yourself. For Step 2 the calculation changes, because practitioners report that there are still very few 4.0 implementations to copy and no sector templates. See what carries over and what you have to rewrite when migrating to 4.0.

Does it pay for itself through tender advantage?

If you bid for Dutch or Belgian public work this is the only sum that matters. Contracting authorities use the Ladder as an award criterion. Your certified step earns a gunningvoordeel, a tender advantage, usually expressed as a fictieve korting or notional discount: your bid price is reduced for evaluation only, and if you win you are paid the full price you quoted. Over 300 authorities apply it. A €30m bid with a 4% advantage is evaluated as €28.8m, beats an uncertified bid of €29m, and the winner still receives €30m.

Rijkswaterstaat, the Dutch national infrastructure agency, applies handbook 4.0 to new procurements from 1 July 2026. Trade publication Infrasite reports: "Vanaf 1 juli 2026 levert trede 1 een fictieve korting van 2% op, trede 2 4% en trede 3 maximaal 6%." Step 1 gives 2%, Step 2 4%, Step 3 a maximum of 6%. SKAO's illustrative model sits higher:

SKAO adds: "Welk percentage, bedrag of puntenaantal u als gunningsvoordeel kiest, bepaalt u zelf." The buyer picks the percentage, amount or points, so the buyer sets the value, not you.

At that lowest percentage, the 2% Rijkswaterstaat applies to Step 1, the notional discount outweighs the full first year cost of a small organisation once the contract is larger than roughly €1 million. That discount is an evaluation device. No money is transferred, and the return only materialises when it wins you a tender you would otherwise have lost. See tender advantage with the CO₂ Performance Ladder for how each buyer weights it.

You do not need to be certified to bid. You declare an ambition level and demonstrate it within one year of award, with a certificate or with a projectverklaring, a project specific statement. That statement covers one project, a certificate covers all projects and clients, so from the second or third tender the certificate is cheaper.

What does handbook 4.0 change about the cost?

Audit days are now fixed per step. For a large organisation, Step 3 costs three and a half audit days more than Step 1, roughly €3,850 to €5,600. Mandatory participation in collaborative sector initiatives has been dropped, removing 40 hours a year from SKAO's old worked example. Against that, a klimaattransitieplan (climate transition plan) is mandatory from Step 2, and the waardeketenanalyse (value chain analysis) has to cover scope 1, 2, 3 and other influenceable emissions. That is new writing.

The strongest cost argument is timing. A 4.0 certificate is valid in a tender asking for 3.1, because Step 1 counts as level 3. The reverse does not hold: a 3.1 certificate is not valid in a tender asking for 4.0, in SKAO's words "omdat versie 4.0 veel verder gaat". Taking one more 3.1 audit in 2026 means paying for it in full and migrating afterwards anyway. The last possible 3.1 audit is 14 January 2027. Which step matches which old level is set out in three steps instead of five levels.

Which costs get underestimated?

Three internal items that never appear on a certification body's quote. Cleaning up historical consumption data that lives in one sprawling workbook with dozens of tabs. Justifying an allocation key, because meters sit on sites while carbon accountability sits on business units, and that key has to stay traceable. And search time during the audit: you buy two to six days a year, you generally cannot spar with the auditor beforehand, and every hour spent hunting for evidence is an hour you have already paid for. See what auditors reject on the CO₂ Performance Ladder.

How Palau handles this

Most of the bill sits in the hours before the auditor arrives. Palau's Vault links every piece of evidence to the data point it belongs to and records which document a figure came from, so the audit days go on assessment. Reef keeps the underlying data in one place, so the same footprint stays usable for your CSRD report, which SKAO confirms is possible. The Organisational structure module handles consolidation across entities.

If you want to see what that saves in hours before your next audit starts, request a pilot.