Risk, Procurement & the Supply Chain

Three risks are genuinely distinctive to off-site, and each flows from the concentration the method relies on.

The first is single-manufacturer dependency and insolvency. When you commit to a modular system, you commit to one manufacturer's factory, product and workforce in a way you never depend on a single trade on a diffuse site. If that manufacturer hits financial trouble or fails mid-project, the consequences are severe and specific: the modules may be half-built in a factory the client cannot easily access, the proprietary system may be hard for anyone else to complete, and there may be no second source that makes exactly that product. The whole project can stall on one company's balance sheet. This is arguably the headline risk of off-site, and it is why financial due diligence on the manufacturer, and contractual and payment protections around what happens if they fail, matter so much - covered below.

The second is early design-freeze risk. The factory needs complete, frozen information before it cuts anything, so off-site forces design decisions to be locked far earlier than on a traditional project - where trades can still adapt late. The risk is twofold: you may freeze before the brief is truly settled (and then need a change the factory has already built past), and an error or omission baked into the frozen design repeats across every module in the production run and is dreadful to correct once modules are made. The point of no return arrives early and bites hard. Managing it means investing heavily in getting the design right before the freeze - mock-ups, prototypes, rigorous coordination - and controlling change tightly afterwards.

The third is transport and handling damage. A finished module is a large, heavy, relatively fragile object that must survive loading, a road journey (with vibration, cornering and possibly a long or rough route), craning and placement - all of which a site-built element, made in situ, never undergoes. Finishes can crack, services can shake loose, a module can be dropped or knocked. This is a real, routine risk that must be designed for (robustness for transport, protection, lifting points) and insured, with clear responsibility for inspection on dispatch and on arrival. None of these three risks is a reason to avoid off-site; all three are reasons to go in with eyes open and protections in place.

Off-site blurs a line that traditional procurement keeps relatively clear: who is responsible for the design. In a modular project the building is usually part designed by the design team (the architect and consultants) and part designed - and warranted - by the manufacturer, whose product is often a proprietary, tested system with its own engineering. That split is efficient (the manufacturer knows their system best) but it creates a dangerous seam: the interfaces. Between the factory-built module and the site-built podium, foundation or core; between one trade's scope and another's; between the manufacturer's design responsibility and the design team's - responsibility can fall into the gap. The classic failure is an interface that everyone assumed someone else was designing, discovered only when the parts do not meet on site.

So a central task in off-site procurement is to make design responsibility explicit and complete, with no gaps and no overlaps: who designs the module, who designs the connections between modules, who designs the module-to-site interface, who coordinates services across the seam, and who carries the warranty for each. This is not the designer's to decide alone - it is a contractual and legal matter - but the designer must understand the seams well enough to insist they are allocated, because an unallocated interface is where both buildability and liability fail.

Alongside responsibility sit warranties and approvals. A proprietary modular system typically comes with the manufacturer's warranties and, crucially, its approvals - the evidence that the system meets the relevant codes and standards, including fire, structure and weathertightness. These approvals are a major part of what the client is buying, and they must actually cover this building's use, height and configuration, and satisfy the authorities and, often, the insurers and lenders who have their own requirements for non-traditional construction. Regulatory approval still rests on the governing codes - in India the National Building Code of India and local regulations - which off-site does not bypass; the manufacturer's approvals and the design team together demonstrate compliance. The binding questions - what the warranties actually cover and for how long, whether the approvals satisfy this project and these authorities, how liability is apportioned - are legal, insurance and engineering matters for the client's advisers, the manufacturer and the specialists. The designer's job is to know the seams exist and to make sure nothing falls through them.

Conventional procurement often appoints the contractor (and through them the supply chain) relatively late, after the design is substantially developed - fine when site trades can adapt, fatal for off-site, where the manufacturer's system, constraints and lead times must shape the design from the start. The single most important procurement principle for off-site is therefore engage the manufacturer early - early enough that their specific system drives the grid, the module sizes, the interfaces and the programme, not the other way round. A design developed in ignorance of the chosen system, then handed to a manufacturer to build, usually has to be substantially redesigned; the efficiency of off-site depends on designing with the system, not retrofitting it.

Several procurement routes support this. Early contractor (or manufacturer) involvement brings the maker onto the team in the design phase to advise on buildability, constraints and logistics. Two-stage tendering appoints the contractor or manufacturer early on a first-stage basis to collaborate on design and price, with a second stage fixing the contract once the design is developed - a common way to get early input while preserving competition. Design-and-build places both design and construction responsibility with one party, which can suit off-site by aligning design with the manufacturer's system, though the client must specify carefully to keep quality and control. Framework agreements and product-platform approaches, where a repeatable system is developed and reused across many projects, suit large repeat clients (housing providers, hotel chains, public programmes) and let the supply chain invest in a stable, improving product. Which route fits depends on the client, the project and the market, and the choice is made with the client's advisers - but all of them share the same logic: get the factory's knowledge into the design before the design is fixed.

The procurement route also carries the risk-management devices the previous lesson introduced. Because the client pays for modules before they are installed, and because manufacturer insolvency is the headline risk, off-site contracts lean on stage payments tied to manufacturing milestones, vesting certificates that transfer ownership of modules to the client as they are built and paid for (so that if the manufacturer fails, the client owns what they have paid for), bonds, retention and parent-company guarantees, and financial due diligence on the manufacturer before commitment. These are contractual and financial instruments - the designer does not draft them - but understanding that they exist, and why off-site needs them more than traditional procurement does, is part of being a competent off-site designer who can help the client ask the right questions early.

All of the above assumes a supply chain capable of delivering - and that assumption is exactly where off-site is most fragile, especially in a developing market. Off-site depends on a mature ecosystem: manufacturers with proven systems and approvals, skilled factory labour, reliable transport and craneage, component suppliers, designers fluent in DfMA, and clients and lenders comfortable with non-traditional procurement and cash-flow. Where that ecosystem is thin, every risk above is amplified: fewer manufacturers means more dependency and less competition; immature systems may lack the approvals insurers and authorities want; inexperienced supply chains make more errors in the very production runs where errors are costly.

India's off-site supply chain is developing rather than mature, and honesty here matters. There is real and growing capability - deep precast-concrete capacity for large repetitive projects, a growing volumetric and prefabricated-bathroom-pod sector, and steel-framed quick-build for schools, healthcare and site accommodation - and scale and speed pressures are driving genuine growth. But the ecosystem is less deep than in the UK, Singapore or the Gulf: fewer manufacturers with fully approved volumetric systems, less established DfMA design capability, and clients and lenders less familiar with the procurement and cash-flow patterns off-site needs. Added to the cost picture from the previous lesson (cheaper site labour pushing the cost crossover higher), this means off-site in India must be approached with particular care about which manufacturers are genuinely capable, which systems are genuinely approved, and whether the supply chain can actually deliver the project - not with imported assumptions from more mature markets.

Managing the whole, then, is a deliberate, early discipline, and the designer is part of it even though the binding instruments are others'. The practical moves recur: due diligence on the manufacturer (financial health, track record, genuine approvals); early engagement so the system shapes the design; rigorous design before the freeze, with mock-ups and prototypes to catch errors while they are cheap; explicit allocation of design responsibility and interfaces so nothing falls through the seams; transport and handling designed and insured with clear inspection points; and the contractual and financial protections (vesting, bonds, stage payments) that address insolvency and early payment. The firm boundary stands: the binding contracts, insurance, warranties, approvals and engineering are for the client's legal and commercial advisers, the manufacturer and the qualified specialists, under the governing codes (NBC India and local regulations). The designer's distinctive contribution is to understand these risks well enough to design the project and shape the procurement so they are managed - and to be honest, especially in India, about whether the supply chain is ready for what the project needs.