Circular Municipal Procurement: Criteria That Can Be Verified

Start with criteria that leave an evidence trail

Municipal tenders fail on circularity most often not because ambition is too low but because the wording chosen cannot be checked. A criterion is only as strong as the document a bidder can hand in to prove it. European practice, summarised in the European Investment Bank's guidance 'Circular Public Procurement in Cities', anchors requirements in attributes that are measurable and documentable: a stated share of recycled content by mass, the length of a guarantee, availability of spare parts, or membership of an accepted ecolabel scheme. Vague phrases such as 'preferably sustainable' invite unprovable claims and are hard to defend at evaluation and appeal.

Frame every criterion as three answers: what is required, who proves it, and with which document. Group criteria by product or service category into a 'criteria bank' so the same verifiable wording is reused across tenders, as recommended in the Ellen MacArthur Foundation's Circular Procurement for Cities guidance. Before finalising, test each candidate criterion with one question: if the winning bidder refused to supply supporting evidence, could your committee still justify the award? If yes, the criterion is too soft to use.

Recycled content: measure it by mass, then prove it

Recycled content is the most practical entry criterion because it is quantifiable. Define it the way the New South Wales Choose Circular directory does: the proportion by mass of recycled material in a product, excluding packaging, counting only pre-consumer and post-consumer material and excluding in-house rework, regrind and scrap reclaimed within the same process. This definition removes most ambiguity at the outset.

For verification, distinguish three levels of evidence:

A self-declaration framed under ISO 14021 for recycled content, backed by material invoices and batch records showing where recycled material entered the supply chain.

Stronger third-party certification of recycled content with chain-of-custody traceability.

Strongest for contested categories, certificates separating post- and pre-consumer fractions; recycled wood typically needs a chain-of-custody certificate plus a declaration of the origin and nature of the material.

State in the specification that a quantified percentage is required and that the bidder's documentation must support exactly that figure.

Durability, repair and spare parts: how to verify

Durability is verified through commitments, not adjectives. Require bidders to state the warranty term in years, to commit to spare-parts availability for a defined period, and to confirm that repair services are offered. A warranty declaration covering conformity of the goods with the contract specification is standard verifiable evidence in EU furniture criteria. Guarantee periods and take-back are among the circular criteria already used in real city tenders.

Do not accept 'repairable design' as a claim; ask what it means operationally — spare-parts availability, published repair documentation, modular components that can be swapped. This converts a vague criterion into a service commitment. The CE-PRINCE analysis of European green public procurement criteria found durability and repairability to be among the best-developed circular attributes, yet also the ones most often left without an explicit verification route.

Take-back and end-of-life: write it as a contract duty

End-of-life behaviour cannot be verified from a brochure; it must be a contract obligation with consequences. Plan for the end of the functional life when drafting the contract — for example by arranging for the supplier to take products back, buy them back, or manage their recovery. Such arrangements are procured as services through lease, buy-resell or take-back models, so materials stay in use or are recovered rather than landfilled.

Make collection, sorting and reporting duties explicit and auditable: the supplier must document volumes taken back, the share reused versus recycled, and the destination of residuals. Where the tender covers construction or demolition, a pre-demolition or pre-use audit and a reuse inventory become the verifiable basis, as demonstrated by the City of Lund's standardised reuse inventories.

Ecolabels and certification: use marks, but accept equivalents

Recognised Type I ecolabels — the EU Ecolabel, Germany's Blue Angel, Nordic equivalents and industry schemes — are convenient because a certified product is deemed to comply with the listed criteria without further testing, shifting the verification burden to the label owner. Under EU procurement law, however, the authority must accept equivalent means of proof, so a bidder offering another reliable label or full documentation must not be excluded.

The same logic applies to certification for recycled content, responsible sourcing or low-emission products. Requirements must be proportionate and non-discriminatory; a label cannot be demanded if a different scheme demonstrates the same property. State openly in the specification that equivalence will be judged against defined criteria, and describe how you will assess it so the evaluation is predictable and defensible.

Build the verification clause into the specification

Verification rules belong in the technical specification and award criteria, not in a wish list. Set a minimum requirement every bidder must meet (for example a minimum recycled content) and a scoring bonus for exceeding it, with points for documented rather than claimed performance. Separate clearly what is required at bid stage — certificates, declarations, data sheets — from what is due after award, such as mass-balance reports, take-back records and audit access. Asking for everything up front is disproportionate; withholding basic evidence until award is too late.

Keep evidence requests proportionate to contract value and to the significance of the claim. For routine categories, a self-declaration under ISO 14021 plus invoices can suffice; for high-value or contested categories, require independent certification. Because only about one in five public authorities currently embeds circular criteria in tenders, verifiable wording is still a differentiator — but expect a first round of clarification and hold market dialogue before the tender to confirm the evidence the market can actually produce.

What mature practice looks like

Documented city examples show the difference between a slogan and a specification. In Tampere, Finland, a circular street project required contractors to reuse 70% of excavated materials and incorporate 50% recycled asphalt. In Niort, France, the city refurbished 350 workstations instead of buying new furniture. In Riga, Latvia, procurement of interior design and furnishing services prioritised reuse and second-hand furniture. In each case the requirement was a number or a deliverable that could be checked, not a general aspiration.

The same logic is now being scaled by institutions such as the EIB's Circular City Centre and the transnational CE-PRINCE project, which publish common criteria and test them in pilot tenders. Regulatory and methodological frameworks evolve — the EU GPP criteria are voluntary today but are expected to move towards mandatory status by the end of the decade — so always check the latest version from the issuing body. Legal grounds differ by jurisdiction: Directive 2014/24/EU governs the EU, while other countries have their own rules. This is general information, not legal advice.