The fractional-versus-permanent decision is harder than it looks

UK senior hiring decisions increasingly start with a question firms didn’t routinely ask five years ago: should this be a fractional appointment, an interim, or a permanent hire? The fractional senior hiring market has matured substantially in the UK over the past decade — particularly for CFO, CMO, COO, CTO and Chief People Officer roles — and the substantive economics for many firms are now genuinely competitive with permanent hiring. The difficulty is that the decision is more nuanced than \”fractional is cheaper\” or \”permanent is more committed\”. The real question is which engagement model fits the firm’s specific situation and the realistic time horizon over which the senior leader needs to operate.

The pattern that recurs in firms making weaker decisions is treating fractional, interim and permanent as primarily a cost question. The substantive question is closer to: what kind of senior leader does the firm need, for what work, over what horizon, with what level of integration into the senior team and broader business? Different answers point at different engagement models, and the cost dimension typically falls out of the right answer rather than driving it.

Three substantive scenarios where the decision goes wrong

Scenario one: \”We don’t need this full-time so it should be fractional.\” This framing treats fractional as the lower-intensity version of permanent. In practice, fractional senior leaders are typically substantive practitioners delivering deep expertise on a focused brief — not the same person doing the same work at lower intensity. Firms that need lower-intensity senior leadership often actually need a permanent senior leader operating at a calibrated scope, not a fractional with the same scope but fewer days.

Scenario two: \”Let’s start with interim while we search for permanent.\” This is sometimes exactly right and sometimes a hidden trap. The trap is that the interim leader, once embedded, frequently becomes the candidate of choice for the permanent role through familiarity rather than through substantive competitive process. The firm ends up with a permanent appointment shaped by who happened to be available for interim, rather than the strongest permanent candidate available in the market.

Scenario three: \”We can’t afford permanent so we’ll go fractional.\” The cost framing obscures the real question. Strong fractional appointments often cost more per day than permanent appointments at the same seniority, because the fractional pricing reflects the substantive expertise plus the firm’s portfolio risk on its own client base. Cost-driven decisions to go fractional frequently end up with weaker fractional appointments rather than the strong fractional appointments the firm could have made through deliberate selection.

The substantive decision framework

The framework I find works in practice has four dimensions. Time horizon: is the work clearly bounded (under twelve months) or open-ended? Bounded work fits interim or fractional; open-ended fits permanent. Scope of ownership: does the senior leader need to build a function over time or apply substantive expertise to a defined brief? Building fits permanent; applying expertise fits fractional or interim. Team-building dimension: does the role need to develop and lead a substantive team beneath them? If yes, permanent. If the team is already substantively led by others and the senior leader is more advisory or expert-led, fractional fits. Strategic integration: does the senior leader need to integrate substantively into firm-wide strategic decisions across multiple years? If yes, permanent.

Working through the four dimensions substantively typically clarifies the answer. The decision rarely should be primarily about cost; the decision should be about which engagement model fits the substantive work the firm needs done.

For substantive treatment of the three engagement models including five common situations and which model fits each, see our Fractional, Interim or Permanent Guide. For broader senior search methodology including engagement model selection, see our Executive Search Methodology Guide.

Adrian Lawrence

Adrian Lawrence FCA is the founder of Exec Capital. He is a Chartered Accountant and holds an ICAEW practising certificate in his own name with over 25 years’ experience operating at C-suite level, Adrian brings direct executive experience to senior search. His background spans private equity-backed businesses, owner-managed companies, and listed environments, giving Exec Capital a practitioner’s understanding of what leadership hires actually require.