Circular economy targets and how they are evidenced
A circular economy statement is only as good as the evidence behind its numbers. Targets for reuse, recycling and design for disassembly have to be traceable to the demolition audit and the structural design.
Circular economy statement targets fail review for one reason more than any other: the numbers are not traceable to anything. A statement that commits to high reuse rates without an audit of the building being demolished, or to design for disassembly without a structural strategy that allows it, is a set of aspirations that a planning condition will later measure against reality.
The discipline is straightforward. Every target needs a source in policy, a baseline in survey data, a design consequence and a reporting mechanism. Miss any of the four and the commitment is unevidenced.
Targets commonly set in policy
Where a circular economy statement is required, the target set comes from the policy and its guidance rather than from the applicant's ambition. In London the London Plan requires referable applications to demonstrate how they will reduce waste and support the circular economy, with the Greater London Authority's guidance setting out the expected rates, the calculation basis and the reporting format. Other authorities have adopted similar requirements through local plans and supplementary planning documents.
The families of target that recur:
- diversion of demolition and excavation waste from landfill, expressed as a percentage by tonnage
- reuse and recycling of construction waste, again by tonnage
- recycled and reused content in new materials, sometimes by value and sometimes by mass
- a commitment to design for disassembly and adaptability, expressed qualitatively with evidence
- a commitment to report actual performance after construction
Quote the figures from the current version of the applicable guidance and name the document and its date. The rates have been revised, and a statement citing a superseded figure invites a request for further information at the worst point in the programme.
Evidence for reuse and recycling rates
The baseline for any demolition target is a quantified audit of the existing building. That means a survey recording, by material stream, what is present, in what quantity, in what condition and with what reuse potential, with photographs and a methodology. A Pre-redevelopment Audit does that work, and it is the document a reviewer will ask for when a reuse tonnage looks optimistic.
Three practical points from doing this on real buildings. Steel sections are the highest-value reuse opportunity and they need connection details and material certificates to be reused structurally rather than melted. Brick reuse depends entirely on mortar strength, so a 1960s building in cement mortar will not yield reclaimable bricks whatever the statement says. And excavation material dominates the tonnage on almost every site, which means the diversion percentage is largely a question of whether the soil can be reused on site.
For new materials, evidence means product-level data: environmental product declarations, recycled content percentages from manufacturers, and a procurement commitment that survives value engineering. A target with no procurement mechanism behind it is the first thing to be dropped when the tender comes back high.
Design for disassembly commitments
Design for disassembly is the part of a circular economy statement that has to be visible in the drawings. Mechanical fixings rather than adhesives. Bolted rather than welded connections. Services run in accessible zones rather than cast into slabs. Facade systems that can be unclipped. A structural grid regular enough that components are interchangeable.
Each of those has a cost and a consequence, and a statement that claims all of them on a scheme using post-tensioned slabs and bonded facade panels will not be believed. Better to claim three commitments that the design actually delivers, and to say plainly which opportunities were considered and rejected and why. Reviewers respond well to that. They see a great deal of the other kind.
Where the scheme uses offsite manufacture, the circular case and the carbon case tend to move together, and the carbon case for modern methods of construction covers that overlap.
Linking to the audit and the carbon assessment
Three documents should share one dataset: the pre-redevelopment audit, the circular economy statement and the whole life carbon assessment. The audit says what exists. The circular statement says what happens to it. The carbon assessment counts the emissions consequences.
| Document | Provides | Depends on |
|---|---|---|
| Pre-redevelopment audit | Quantities and condition of existing materials | Survey access to the building |
| Circular economy statement | Targets, strategy and reporting commitment | Audit quantities and the design strategy |
| Whole life carbon assessment | Emissions by life cycle stage | Material quantities and reuse assumptions |
| Site waste management plan | Site-level waste handling and records | Contractor appointment and method |
Where the numbers disagree between documents, the reviewer will notice. A Whole Life Carbon Assessment claiming reused steel that the circular statement does not mention is the sort of inconsistency that costs a determination a fortnight.
Reporting at post-construction stage
Post-construction reporting compares what happened against what was approved, using waste transfer notes, weighbridge tickets and procurement records. The reporting format is usually specified by the guidance, and the condition normally requires submission within a defined period after practical completion.
Set the record-keeping up at the start of construction, not at the end. A contractor who has kept waste transfer notes by stream since the enabling works can produce the report in a week, and the duty of care record-keeping obligations under the waste regulations mean those documents should exist anyway. A contractor reconstructing the position from invoices cannot.
Illustrative example: a mid-rise office to residential conversion retaining the frame. The audit records the frame, the raised floors, the suspended ceilings and the curtain walling. The statement commits to retaining the frame in situ, reusing raised floor panels in the back of house areas, sending ceiling tiles to a manufacturer take-back scheme, and recycling the curtain walling aluminium. Retention of the frame is the largest single benefit and it is delivered by the design rather than by a waste target. Illustrative only.
Where targets conflict with structural design
Say it in the statement. Reuse of structural components requires known provenance and testing, and where that cannot be obtained the safer engineering decision is new material. Fire performance requirements can rule out reused cladding. Adhesive-bonded assemblies sometimes outperform mechanically fixed ones on airtightness and acoustics, which is a real trade-off against disassembly.
A statement that records the conflict and the reasoning is more use to a case officer than one that pretends the conflict does not exist, and it protects the applicant when the built scheme does not match an over-claimed target. A Circular Economy Statement draft gives the section structure and flags where the audit figures have to be inserted, and a Site Waste Management Plan covers the site-level record-keeping that the reporting condition will draw on.
Conditions securing the commitments
Expect three condition types. A pre-start condition requiring the approved circular economy strategy to be implemented, or an updated version to be approved. A condition requiring the post-construction report within a stated period. And sometimes a condition or obligation requiring specific measures, such as a take-back agreement or a material passport handover at completion.
Read the wording carefully at the decision stage. National guidance requires conditions to be necessary, relevant, enforceable, precise and reasonable, and a condition requiring a target that the evidence never supported is worth negotiating before it is imposed rather than after.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it, and verify the current target figures in the applicable policy guidance.
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Frequently asked questions
Which schemes need a circular economy statement?
It is a policy requirement rather than a national one. In London it applies to referable applications under the London Plan, and other authorities have adopted similar requirements for major development through local plans and supplementary guidance. Check the adopted plan and the validation list, because the trigger and the required content vary.
Where do the target figures come from?
From adopted policy and its supporting guidance rather than from the applicant. The Greater London Authority's guidance sets expected diversion and reuse rates and the reporting format, and local plans elsewhere set their own. Quote the current figures from the applicable document, because they have been revised since the policy was introduced.
How is a reuse commitment evidenced before demolition?
Through a pre-redevelopment audit of the existing building that records quantities, condition and reuse potential by material, with photographs. Without that baseline a reuse target is a guess, and a reviewer cannot test whether the tonnage claimed exists in the building at all.
What is a material passport?
A record of what a component is made of, how it is fixed and how it can be recovered, kept so that a future owner can reuse it rather than demolish it. In planning terms it is a commitment about information rather than about fabric, and it is only meaningful if the condition requires it to be produced and handed over.
Are the targets enforced after completion?
They can be. Councils commonly impose a condition requiring a post-construction report comparing actual performance against the approved targets, submitted within a set period of practical completion. Whether that is followed up varies, though the condition itself is enforceable and shows up in due diligence on sale.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.