Construction project feasibility: the evidence clients need before committing
Admin · 22 October 2026
Illustrative image. Photo by C Dustin on Unsplash. Unsplash License.
A feasibility study earns its place when it changes a decision. A document that describes an attractive building without testing whether the client can deliver, operate and afford it leaves the hardest questions unanswered. For development directors, estates teams and project sponsors, the useful output is a reasoned choice between credible options, with the remaining uncertainties visible. That choice might be to proceed, investigate further, reduce the scope, pursue another site or stop.
The study should therefore begin with the decision it must support. Buying land requires different evidence from authorising a design appointment or releasing construction expenditure. Combining every future approval into one optimistic business case can hide these differences. Agree the next commitment, the evidence needed for it and the person authorised to make it. Then organise the study around those requirements, rather than around a standard report template.
Define the business problem before the building
Write down what the organisation needs to achieve in operational terms. A warehouse occupier might need additional throughput, safer separation of activities and room for seasonal stock. Those needs do not automatically imply a new warehouse. Reconfiguring an existing facility, changing shifts or leasing nearby capacity may deserve examination. Including a credible minimum intervention option makes the comparison more useful and helps explain why a construction solution is justified.
Identify who will experience the outcome. The sponsor may focus on investment approval, while operators need reliable access, maintainable equipment and manageable running costs. Customers, neighbours and maintenance contractors may reveal constraints that the initial brief misses. Record which requirements are essential, which are preferences and which remain assumptions. An aspiration such as flexibility needs a practical definition: flexibility for what activity, over what period, and with what acceptable disruption?
Build an evidence register
For each material assumption, record its source, date, owner and confidence. Distinguish verified information from an estimate, a stakeholder preference or an unresolved question. A utility capacity statement, for example, should not be treated as equivalent to a connection quotation with a defined scope and delivery date. Similarly, an indicative layout does not establish that all technical, access and approval requirements can be satisfied.
The register need not become a second report. A compact table linking assumptions to decisions is often enough. Its value lies in exposing where the preferred option depends on weak evidence. Rank further investigations by the decisions they could change. Spending early effort on a minor finish selection achieves little if uncertainty about access or ground conditions could invalidate the site strategy. Investigation budgets should follow decision significance, rather than the order in which consultants happen to be appointed.
Compare options on the same basis
Options become difficult to compare when one includes fit-out, professional services and commissioning while another contains only construction work. Establish common boundaries before requesting estimates. State the area basis, operational capacity, scope exclusions, information maturity and assumed completion date for each option. Record any differences that cannot sensibly be normalised. Apparent precision is less useful than a transparent explanation of what each figure includes.
Use criteria that reflect the client’s objectives. These might cover operational performance, delivery risk, adaptability, environmental objectives and disruption to existing activity. Avoid selecting weights after the preferred option is already apparent. Discuss the criteria with the decision makers beforehand, and retain the reasoning behind them. A weighted score can structure a conversation, but it should not conceal a critical failure, such as an option that cannot provide an essential operational function.
Test delivery as well as design
A feasible concept must have a plausible route to completion. Ask how surveys, design decisions, permissions, procurement, manufacture and site operations connect. Identify the assumptions behind the earliest occupation date. A programme that simply assigns a duration to construction may miss the activities that determine when work can start. Show which dependencies are under the client’s control and which require agreement from outside parties.
Market engagement can help test whether the proposed packaging and sequence are realistic, provided the exercise is structured appropriately for the procurement context. Ask suppliers specific questions about capacity, information requirements and alternatives. Record the conditions attached to their responses. An informal indication of availability should not be presented as a reserved production slot. The study should explain what would need to happen to turn that indication into a dependable commitment.
Make uncertainty visible in the recommendation
A single cost and date can imply more certainty than the available evidence supports. Present the basis of the estimate and explain the major variables. Explore scenarios that represent meaningful changes in assumptions, rather than arbitrary percentage movements. If the access strategy changes, for example, consider the consequences for enabling works, deliveries, temporary arrangements and operational disruption together. The same underlying issue may affect several parts of the case.
A hypothetical distribution project illustrates the approach. Option A extends the current building, while Option B relocates operations. The extension appears cheaper initially, but relies on maintaining throughput during construction. Instead of burying that dependency in a risk list, the team tests a temporary operating arrangement with the warehouse manager. If the arrangement cannot support essential activity, the comparison changes before the client commits to detailed design.
Include operation and transition
Occupation is a transition, not just a date at the end of a bar chart. Establish what needs to be ready for the organisation to use the asset successfully. Depending on the project, this may include training, equipment installation, commissioning evidence, maintenance arrangements and the move from an existing site. Identify who owns each element and whether its cost and time have been included in the option appraisal.
Consider ongoing demands in terms the operator can evaluate. Access for maintenance, replacement routes, cleaning requirements and the availability of specialist support can influence long-term usefulness. Avoid claiming that a more expensive component will pay for itself without a clear calculation and stated assumptions. Where reliable information is unavailable, identify the question for the next stage instead of presenting an unsupported whole-life saving as established fact.
Write an approval that can be acted on
The recommendation should name the preferred option, explain why it performs best against the agreed criteria and describe the conditions attached to proceeding. List the unresolved matters that could materially alter the choice. For each, identify an owner, an investigation or decision, and the point before which it must be resolved. This gives the sponsor a practical basis for conditional approval rather than a vague instruction to manage the risks.
The Cabinet Office’s Construction Playbook provides a public works policy context for assessment, procurement and delivery. Its stated comply-or-explain expectations apply to central government departments and their arm’s length bodies; they should not be presented as a universal rule for every private development. The approach described here is an editorial decision framework. Its detail should be adapted to the project’s governance, procurement obligations and specialist advice.
After approval, preserve the assumptions that justified it. Transfer them into the brief, risk register and next stage information requirements, with named owners. Review the case when a material assumption changes. A feasibility study remains useful when the delivery team can trace the project’s commitments back to the evidence and understand when the original decision needs to be reconsidered.
Give the approval meeting a concise decision paper alongside the supporting report. Include the options rejected and the reasons, so later teams do not repeat the same investigations without new evidence. Record the decision itself, including any limits on expenditure or commitments. That record connects the analysis to a controlled next step and gives incoming team members a clear explanation of what has actually been authorised.
