A senior resource gap opens on a critical programme, and someone has to decide fast: recruit permanently, or bring in an interim? The wrong call costs months either way, a rushed permanent hire who isn't the right fit, or an interim brought in too late to matter.
The decision is usually rushed because it's framed as a binary choice. It works better as a diagnosis.
Defining the nature of the gap
The question worth answering first isn't "interim or permanent," it's whether the role is a genuine long-term addition to the organisation or a specific, time-bound need. Ongoing ownership, institutional relationships, a seat at the table for years: that's permanent territory, and interim resourcing was never designed to substitute for organisational growth.
A critical programme with no senior owner right now, a leadership gap while recruitment happens properly, a turnaround needing experienced hands immediately: that's interim territory, and a permanent hire for a temporary problem is expensive in both directions, slow to fill, and awkward to unwind.
The distinction sounds obvious when stated this plainly, and it usually is obvious, once someone actually asks the question deliberately, rather than defaulting to whichever hiring process happens to be fastest to start. Most organisations don't lack the judgement to tell the two apart. They lack the moment of deliberate pause in which to apply it, because a resource gap on a live programme creates its own pressure to move immediately, and moving immediately usually means reaching for whatever hiring process is already familiar rather than the one that actually fits.
What the market is actually paying
Permanent hiring has its own pressure right now. APM's 2025 Salary and Market Trends Survey found average UK project management salaries rose 10% in a single year, to £52,500, with senior and specialist roles considerably higher, per the
APM Salary Survey 2025. That's a tightening market, and it cuts both ways. It makes permanent hiring for a genuine long-term role a sound investment, because good people are increasingly hard to find. It also makes a slow, uncertain permanent search a worse gamble for a time-bound gap, "we'll find someone quickly" is a harder promise to keep in a rising market than it was two years ago.
It's worth being specific about what "harder to keep" means in practice. A rising market doesn't just mean higher salaries for the person eventually hired, it means a longer search, more competing offers for the strongest candidates, and a higher chance that the process drags into its fourth or fifth month while the gap it was meant to fill continues to cost the programme momentum every week it stays open.
The switching cost nobody puts in the business case
The real risk isn't picking interim or permanent. It's guessing wrong and having to switch mid-crisis. A rushed permanent hire who leaves within a year costs the recruitment fee, the onboarding time, and the momentum lost while they ramped up, twice, once for them and once for their replacement. An interim brought in for what turns out to be a permanent need simply delays the real hiring decision while the gap persists underneath. Neither mistake shows up in the initial comparison. Both show up in the delivery timeline six months later.
There's a subtler version of the second mistake worth naming: an interim who is genuinely excellent can make a permanent hiring decision feel less urgent than it is, precisely because the immediate pain has gone away. The gap hasn't closed, it's been covered, and organisations that mistake coverage for resolution often find themselves extending an interim engagement repeatedly rather than confronting the underlying, unaddressed permanent need.
What "interim" should actually mean
Interim shouldn't mean whoever's available. It should mean a senior practitioner with fifteen-plus years of experience, based in the country they're working in, able to embed within three to six weeks, not a graduate running a template while a permanent hire is found. The difference matters most in exactly the situations where interim resourcing gets used: a genuine crisis has no tolerance for a learning curve, and an interim who needs weeks to become useful has failed at the one thing interim resourcing is supposed to guarantee.
Where to start
Don't ask "interim or permanent" first. Ask whether the gap is about to close on its own once the crisis passes, or whether it's a permanent hole in the organisation. The answer to that question answers the hiring one.
Agile Minds provides senior interim project managers, embedded fast, for exactly this kind of gap. If you're not sure which one you're looking at,
we should talk.
