Cushman & Wakefield
Turning technical ESG due diligence into reviewable EPC and retrofit choices
For our clients, the real value of technical ESG due diligence is understanding what property-level findings mean for capital requirements, transaction risk and the options ahead. A consistent decision-support workflow can help our teams turn that evidence into clearer advice, while professional judgement and client accountability remain central.
The situation
Cushman & Wakefield’s UK sustainability and technical due-diligence practitioners advise investors on portfolio transactions. In a confidential assignment covering a 55-asset UK portfolio, the question for the advisory team was how to evaluate potential EPC improvements and retrofit capital requirements across multiple properties on a transaction timetable.
The method ran from building and technical due-diligence evidence to indicative EPC and retrofit pathways, to cost comparison, to professional review and client reporting.
The challenge
What does an EPC improvement pathway actually require?
For investors considering a portfolio transaction, the current EPC position is only one part of the question. The decisions that follow are more demanding: which building measures might improve energy performance, how much could they cost, and how should technical uncertainties be reflected in due-diligence advice?
Those questions are difficult to answer consistently when information comes from different technical reports, property systems, construction histories, and existing EPC records, particularly when survey material arrives in stages and the transaction timetable is fixed. Cushman & Wakefield’s UK sustainability team engaged Optiml to support this analytical step in a confidential multi-property assignment.
The solution
From fragmented source inputs to comparable scenarios
Cushman & Wakefield’s experts drew on existing building information and technical due-diligence findings. Optiml’s software helped produce indicative EPC-related estimates and model alternative retrofit measures and associated costs at property level. The outputs provided a structure for comparing options across the assessed properties, rather than reducing the task to a single EPC label or one prescribed intervention.
The starting point remained building-specific evidence. Different technical systems, fabric conditions, and assumptions affect the modeled interventions and costs, and those assumptions need scrutiny: a scenario can show what might be feasible under stated inputs, but it cannot replace inspection, accreditation, or the final judgment of a qualified adviser. Cushman & Wakefield provided the building and market expertise and the client understanding, and used Optiml’s Real Estate Decision Intelligence as scalable decision support.
The results
A more repeatable starting point for evaluating property-specific measures and communicating choices
The practical benefit was an analytical workflow that connected building evidence to options the advisory team could test and interpret. Instead of presenting retrofit measures in isolation or in static reports, the work supported a clearer view of indicative technical pathways and capital implications across the assessed properties. It also helped the team engage with questions about model assumptions and cost methodology, an essential part of making decision support useful for professional services.
No realized financial saving or official EPC outcome is claimed. The contribution is better-structured choices and strategic opportunities for professional scrutiny.
Why it worked
The adviser remains accountable
For multi-disciplinary real estate advisers, the value of technical ESG due diligence lies in helping clients connect building condition and potential interventions with capital needs and transaction or asset-management decisions. A repeatable decision-support method helps teams communicate that connection more consistently, without standardizing away local constraints or transferring accountability to a model.
The case shows how an advisory team can use decision technology to move from source evidence to reviewable capital-allocation and retrofit scenarios within an active due-diligence workflow: more structured decision support, not a substitute for advice.