Procurement & Contracts for Reuse

Procurement is the process by which a project decides what to buy, from whom, on what terms - and conventional construction procurement, refined over decades, is optimised for a linear world in ways that block reuse almost invisibly. No one sets out to prevent circularity; the barriers are the ordinary defaults, each sensible in isolation, that together strain reuse out.

The first default is lowest capital price. Tenders are typically awarded to the cheapest compliant bid, judged on upfront cost. This quietly punishes reuse in two ways: reclaimed materials often carry the recovery, storage and re-certification friction of the previous lessons, so their capital price may not undercut new; and lowest-price thinking ignores whole-life value, the very frame in which circularity pays. A value-engineering exercise late in a project - cutting cost to hit a budget - will often strip out exactly the reuse and durability that a circular design intended, because it optimises for the capital line, not the life.

The second default is the new, branded specification. Specifications habitually name a specific new product - a brand, a model, a standard tested to a certificate - because that is precise, familiar and easy to warranty. But a specification that says "supply and install new [brand] [model]" has, by its wording, excluded every reused alternative before a single bid comes in. Reuse is filtered out at the level of language.

The third default is the warranty and risk demand. Contracts routinely require full manufacturer's warranties and place performance risk on the contractor, who lays it onto the manufacturer - a chain that a reused product, with no manufacturer standing behind its second life (Lesson 7.2), simply cannot satisfy. Faced with an un-warrantable material, the safe procurement choice is new.

The fourth is programme. Reuse needs time - to audit, to source, to store, to re-certify - and conventional programmes, built around ordering new materials to a just-in-time schedule, rarely allow it. A tight programme is a quiet reuse-killer: even a willing team cannot source reclaimed materials in a slot sized for a phone call to a merchant. Put these defaults together and you have a funnel that removes reuse at every stage - price, specification, warranty, programme - so that, without anyone ever choosing against circularity, only new survives. Seeing this filter clearly is the first step to designing procurement that does not have it.

If the specification is where reuse is most often filtered out by language, it is also where the designer has the most direct power to let it back in. The core shift is from specifying a product to specifying a performance - and from a specification that assumes new to one that permits, or actively calls for, reused.

The key move is the performance specification. Instead of naming a new product by brand and model, describe what the material has to *do* - the load it must carry, the fire performance it must reach, the durability, the dimensions, the appearance - and allow any material, new or reused, that demonstrably meets it. A performance specification does not exclude reuse by its wording; it opens the door to any material that can prove it performs, which is exactly the frame a reclaimed material needs (its fitness being established by testing and, for anything structural, a qualified engineer). This single change - specify the outcome, not the product - removes the most common linguistic barrier to reuse.

Beyond that, specifications can be written to actively favour or require reuse: stating a reused-content target, requiring bidders to consider reclaimed materials, or specifying that particular elements be sourced reused where fit examples are available. They can reference provenance and documentation - asking for the history, condition and, ideally, a material passport of a reused component - so that the information needed to trust and re-certify it travels with it. And they can be written with the flexibility that reuse demands: because reclaimed materials come in the quantities and specifications history dealt, not the ones a designer would choose, a specification that allows a range (of size, of appearance, of tolerance) lets a project use what the market actually offers rather than ruling it out for not matching an idealised drawing.

Crucially, specifying *for* reuse also means specifying honestly *around* the friction. A reuse specification should make clear where fitness must be established by testing and professional judgement, where provenance is required, and where the binding decisions sit - it should invite reuse without pretending the certification, warranty and liability questions are the designer's to answer. Done well, specification is the designer's single most powerful lever on the reuse supply chain: it can turn a project from one that filters reuse out by default into one that welcomes it by design - while keeping the binding fitness and legal questions firmly with the engineers, testers and advisers who carry them.

A performance specification opens the door, but reuse also needs a procurement route - the overall way the project is organised to buy design and construction - that gives it room to happen. Conventional routes, built for buying new to a fixed design, often leave no space for the timing, flexibility and early sourcing that reuse requires; routes designed with reuse in mind can build that space in.

The first ingredient is early involvement and foresight. Reuse cannot be bolted on at tender; it has to be planned from the start. A route that brings the contractor, key suppliers and (for demolition-and-rebuild) the deconstruction team in early lets the project know what materials will be available and when, and design around them - turning the timing mismatch (Lesson 7.2) from a killer into a planned alignment. Pre-demolition and material audits (Module 4.2) feed this: knowing what a building will yield before it comes down lets its materials be matched to the new design in advance rather than salvaged on speculation.

The second is flexibility in the route. Because reclaimed materials are what history dealt, a route that fixes every detail before sourcing begins will keep colliding with what is actually available. Routes that allow the design to adapt to found materials - deciding some elements late, once the reuse supply is known - let a project use the market rather than fight it. This is a real departure from the fix-everything-then-tender habit, and it needs a client and team comfortable with a degree of designed-in uncertainty.

The third is aligning who buys with who benefits. Split responsibilities - where a demolition contractor is paid to clear a site fast and has no stake in recovery, while a separate construction contractor buys everything new - guarantee waste. Routes that connect the two ends (the same developer, contractor or framework spanning demolition and construction, or a business model like product-as-service that keeps a responsible owner across the loop) let materials flow from one project to the next. Large developers, estates and public bodies with continuing programmes are especially well placed here: they can run their own reverse-logistics pipeline as the storage buffer and move materials between their own projects, sidestepping the thin open market entirely. None of this changes the firm boundary: the procurement route can make reuse possible, but the fitness of reused elements, the code compliance, and the contractual and legal terms remain with engineers, the codes and the client's professional advisers. What the designer contributes is the foresight, the flexibility and the early coordination that give reuse the room it needs to happen at all.

Every procurement decision ends in a contract, and this is where reuse meets its final and hardest test: the allocation of risk. A construction contract is, in large part, a machine for assigning risk - who is responsible if something is late, defective, or fails - and reuse introduces risks the standard machine was not built to handle. Who is liable if a reused component underperforms? Who carries the risk that the reclaimed material a project was counting on turns out to be unavailable or unfit when needed? Who stands behind a product with no manufacturer's warranty? Conventional contracts answer these by defaulting to new, warranted materials and laying risk down a familiar chain; reuse breaks the chain, and unless the contract deliberately re-allocates the risk, the safe default reasserts itself and reuse is squeezed out at signing.

Making reuse contractually real therefore means allocating its risks deliberately and fairly - and this is genuinely hard, because someone has to carry risks that, in the new-material world, a manufacturer's warranty absorbed. The principle that specialists apply is to place each risk with the party best able to understand, manage and bear it: the risk of a reused structural element's fitness with the process that certifies it (engineer and testing), the risk of availability with the party controlling the supply, the performance risk shared or insured rather than dumped on a contractor who cannot lay it off. Some projects use specialist re-certification, reused-product guarantees from suppliers, or insurance products designed for reuse to make the risk carriable. But the specific wording, the enforceable terms, and the formal allocation of liability are not the designer's to write.

And here the course draws its firmest line of the module. Contracts, risk allocation, liability and the legal enforceability of any reuse arrangement are for the client's lawyers, quantity surveyors and professional advisers, and for the governing codes - never for a designer to draft, decide or assume. A designer who writes "the contractor warrants the reused steel" into a specification, or who assumes a reused component's liability can simply be waved through, is straying across a boundary that exists precisely because these decisions carry consequences a designer is not qualified or insured to own. What the designer can and should do is understand that the contract is where reuse most often lives or dies, raise the risk-allocation question early so the specialists can address it (not discover it at signing), insist on the provenance and documentation that make risk carriable, favour procurement routes and business models that keep a responsible party across the loop, and bring the lawyers, quantity surveyors, engineers and insurers in from the start. The circular designer's job is to make reuse *possible* all the way to the contract - and then to defer the binding contractual and legal decisions to those who carry them. That combination - pushing reuse as far as design and specification can take it, and knowing exactly where to hand it over - is the mark of a serious, honest circular practitioner, and the note this module ends on.