What Stage 0 entails – and why it matters

Across Europe, retrofit has quietly shifted from being an outlier in development strategy to its default starting point. Yet despite this shift, the industry still sees projects accelerating into concept design long before the existing building is truly understood. This is where risk embeds itself – through untested assumptions, inherited defects, and briefs shaped more by optimism than evidence. If retrofit is to fulfil its potential, the sector needs to get better at de‑risking projects before what the UK defines as RIBA Stage 1. And that means bringing architects in at the very start – during what is known as Stage 0.

Get architects involved earlier

Official RIBA guidance does not explicitly require a design team between Stage 0 and Stage 1, and across the many countries where architectural practices work today frameworks vary significantly. But the principle remains universal: architects should be involved earlier. Stage 0 is the moment when options are still open, assumptions can be surfaced and challenged, and decisions can be aligned to client objectives – before design momentum hardens them into constraints.

At Hyphen, we have intentionally made Stage 0 a core specialism. Early decisions carry the greatest impact on cost, time and long‑term viability, which is why we begin not with a design ambition but with the client’s commercial constraint. Stage 0 is where we shift the fundamental question from “What do we want to design?” to “What can we design?” Put simply, it is a holistic, data‑driven process grounded in feasibility, evidence and consequence, not aspiration alone.

A central part of Stage 0 is evaluating strategic pathways. For every project, we test scenarios that can generally be summarised as “Do little”, “Do something”, or “Do a lot”. Each pathway is examined through the lenses that genuinely matter – cost, carbon, disruption, lifespan and resilience. When multiple end uses are viable, this is where they rise or fall. We assess structural capacity, servicing potential and environmental performance before clients become attached to end uses that may be technically or commercially unrealistic. This is where architectural advisory and technical know-how proves its worth, extending asset life and improving commercial outcomes through clarity, not compromise.

Early clarity prevents rework

Commercial logic underpins all of this, as Stage 0 aligns anticipated yield, ESG obligations and asset appeal with architectural intent. If the building’s physical reality and the business case clash, the long‑term risk to viability escalates quickly. Developers, investors and asset managers increasingly need candour earlier in the process, as this affords them clear insight into what is viable, financeable and operationally sound. Early clarity prevents the rework, redesign and programme shocks that occur when constraints surface too late. It also avoids the false economy of “travelling light” – the temptation to limit early consultant involvement, often resulting in gaps that become costly to fill downstream.

In truth, Stage 0 works best when it is collaborative from the outset. Too often, architects are brought in only once the end use has been fixed and the vision has already been sold. Teams are then tasked with retrofitting viability into a predetermined brief, an approach that rarely results in buildings that perform as well as they could have. The alternative – architects, engineers, cost consultants and developers working together at Stage 0 – creates alignment early. It ensures that issues which might otherwise emerge mid‑design or mid‑construction are addressed when they are still easy to resolve. It also embeds lifecycle thinking at the right time – considering how an asset works today; how it might evolve in years one, five and ten; and how reinvestment can be minimised through smarter early decisions.

Repurposing buildings for data centres

Stage 0 can also open unexpected but suitable uses. Data centres, for example, are often assumed to require new‑build facilities, yet in some cases, adapting underperforming buildings provides a more sustainable and commercially attractive route. Repurposed assets can deliver critical digital infrastructure while preserving urban character, avoiding unnecessary land take, and saving up to 40% in embodied carbon. As demand for digital infrastructure accelerates, these opportunities become more relevant, and they almost always emerge at Stage 0, not after a design strategy has been locked in.

Across dense urban sites and remote rural locations alike, Stage 0 is where fundamentals such as power, access, utilities, market demand and lifecycle potential are interrogated long before design begins. This is the stage at which we determine whether a proposed use is viable today and adaptable tomorrow. It is also where candid advice matters most.

Bigger investments mean bigger risks

The scale of contemporary development makes early-stage architectural advisory even more critical. Bigger investments bring bigger risks, and decisions made on day one shape commercial viability, programme certainty and long-term resilience.

Decisions are being made earlier, in environments of heightened uncertainty, where clients are pausing not because they lack ambition but because the assumptions underpinning that ambition feel risky. Advisors who can make uncertainty legible – who surface assumptions, test scenarios and articulate consequences – create value long before design begins. At Stage 0, value comes from options, not answers.

For developers, Stage 0 provides strong feasibility testing that protects returns, clarifies what is approvable – not just desirable – and avoids rework caused by late-stage constraints. For investors, it delivers defensible underwriting assumptions, a better understanding of downside risk, and early testing that helps prevent future stranded assets. And for asset managers, it aligns asset evolution with portfolio strategy, maintains income and trust during transitions, and allows assets to change without undermining what already works. 

What unites all these perspectives is a shared mindset: we start with the client’s commercial constraint, not a design ambition. We translate standards and thresholds into practical choices, timelines and consequences. And we work closely with client teams early, making it easier to involve legal counsel, valuation experts, lenders and future occupiers when options are still open, not closed.

Stage 0 is where every responsible project must begin

If retrofit is the new default, then Stage 0 is where every responsible project must begin. It replaces guesswork with intelligence, aligns ambition with reality and, most importantly, ensures that the most consequential decisions are made when the cost of getting them wrong is still low. The industry is at an inflection point, particularly in the fast‑growing digital infrastructure sector, but the principle holds across every asset type: think harder earlier, and you move faster later.