Pre-demolition audits and circular economy statements

A pre-demolition audit circular economy statements rely on is a quantified inventory of what is already on the site, element by element and material by material, produced while the building is still standing. Without it a circular economy statement is a set of intentions. With it, the statement can say how many tonnes of brick, steel, concrete and raised floor exist, where each is likely to go, and what proportion of the total is being kept.

The timing is what people get wrong. An audit carried out after the demolition contractor is appointed cannot change anything.

What the audit records and when to do it

The audit walks the building and records, for each element, the material, an estimated quantity by mass or volume, its condition, any contamination, and a realistic destination.

Elements worth capturing separately include the substructure and frame, external walls and cladding, roof coverings, internal partitions, raised access floors, suspended ceilings, doors and ironmongery, sanitaryware, mechanical and electrical plant, lifts, and external hard landscape. Bricks, structural steel sections, timber, stone and paving are the materials with the strongest reuse markets.

Hazardous materials are surveyed under a separate regime. A refurbishment and demolition asbestos survey under the asbestos regulations is a legal requirement before works and its findings constrain what can be recovered. Treat it as an input to the audit rather than part of it.

Do the audit before the design is fixed. That is the whole point of it. An audit that arrives at the planning stage as a compliance document has already missed the moment when the information could have changed the scheme.

Quantifying materials by element

Quantities need to be defensible, because the targets are expressed as proportions and a soft denominator makes the percentage meaningless.

Work from measured drawings where they exist, from survey where they do not, and state the basis for each estimate. Convert to mass using standard material densities and record the density used. Where an element cannot be inspected, say so and flag the quantity as provisional.

Report the total arisings, the proportion by mass going to each route, and the assumptions behind the split. A statement that gives a single recovery percentage with no breakdown invites a question you should have answered.

Reuse, recycling and recovery routes

These are not interchangeable and the hierarchy matters.

Reuse in situ ranks highest: keeping the substructure, retaining a frame, leaving a basement in place. It avoids the demolition, the transport and the replacement material in one move, which is why retention arguments increasingly carry the whole circular economy case. The carbon consequence of that decision belongs in the Whole Life Carbon Assessment rather than being claimed twice.

Reuse off site comes next, and it depends on a receiving project and on the element surviving removal. Steel reuse needs traceability and testing to establish properties, and the specification route for that is established but not automatic.

Recycling turns the material into a lower grade input, most commonly concrete crushed for aggregate. On-site crushing avoids transport and is worth designing into the programme where space allows.

Recovery, usually energy from waste, sits at the bottom and should be small.

Be careful with the vocabulary in the statement. Councils read reuse, recycling and recovery as distinct outcomes, and a document that merges them into a single diversion figure loses the argument it was written to make. Report each route separately, then give the combined figure.

Targets and how they are expressed

In London, circular economy policy requires referable schemes to submit a statement with recovery targets for demolition, excavation and construction waste expressed as percentages diverted from landfill, alongside requirements on recycled content. Take the current figures from the adopted London Plan and the associated guidance, because they have been revised and a statement quoting superseded numbers is easy to spot.

Outside London, authorities increasingly ask for equivalent information through local plan policy or supplementary guidance, and some apply the national industry protocol that produces a recovery index from the audit data.

Whichever framework applies, express the target in the same units as the audit output so that the two documents can be read together. A target in percentage by mass and an audit in square metres do not reconcile.

Coordination with the demolition contractor

Deconstruction and demolition are different operations. Mechanical demolition is fast and produces mixed arisings. Careful deconstruction recovers whole elements and takes longer, needs more space for sorting and storage, and costs more per square metre.

The audit is what lets that trade-off be priced. Give it to the demolition contractor at tender stage with the reuse targets attached, and ask for the method statement to say how each identified element will be recovered, where it will be stored and who will take it.

Storage space is the constraint people underestimate. Reclaimed brick needs somewhere to sit while it is cleaned, and on a tight urban site that space may not exist. Say so in the statement rather than committing to a target the site cannot deliver, and consider whether an off-site consolidation arrangement is available.

This coordination sits alongside the wider construction planning described in modern methods of construction and the carbon case, where the same early decisions govern what is possible later.

Reporting after completion

Circular economy commitments are increasingly secured by condition or obligation, with post-completion reporting of actual figures against the targets.

Set up the data collection at the start. Waste transfer notes, weighbridge tickets, and records of elements taken for reuse with the receiving party named are the evidence, and they have to be captured as the work happens. Reconstructing them from invoices eighteen months later produces numbers nobody believes.

Report honestly where a target was missed, with the reason. Authorities have seen enough of these to know that markets fail, contaminated material appears, and elements break during removal.

Name someone responsible for the reporting at the outset, ideally on the client side rather than the contractor's, because the obligation outlives the build contract. A reporting requirement with nobody attached to it is the condition most often found outstanding when a site is sold on.

Where the audit changes the design

The audits that earn their fee are the ones that reach the design team early enough to change something.

Common outcomes: a decision to retain the substructure and part of the frame rather than clear the site, which usually dominates every other circular economy measure combined. A facing brick recovered and reused on the new building, which is a design decision about mortar and bond as much as a waste one. Steel sections reused within the new frame, which needs the structural engineer to design around available section sizes rather than specifying freely. Raised floor and ceiling systems carried across into the new fit-out.

A Pre-redevelopment Audit feeding a Circular Economy Statement is the pairing councils expect, and the second is only as good as the first.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.