When Do You Hire an HR Consultant? (The Answer Isn’t What You Think and What Fast-Growth Founders Need)
Most founders get this completely wrong.
When founders ask me when they should hire an HR consultant, they’re usually asking the wrong question.
They’re asking it reactively because something has gone wrong. A key person has resigned without warning. A grievance has landed on their desk. A tribunal claim is looming. A hire they were convinced would be transformational has turned out to be anything but, and now they’re not sure how to exit them.
At that point, yes you need an HR consultant. But you needed one before any of that happened.
The businesses I work with that scale smoothly, that retain their best people, that build cultures people actively want to be part of , they didn’t bring in strategic HR support because they were in crisis. They brought it in because they were growing fast and smart enough to know that people decisions at pace carry real commercial risk.
So let me answer the question properly. Not ‘when things go wrong.’ Here’s when you actually need an HR consultant and what good HR support should be doing for your business at each stage.
The signals that tell you it’s time.
When do you hire an HR consultant signal 1: You’re making it up as you go and it’s starting to show
Every fast-growth business has a period where the founder is also the HR function. Hiring decisions made on instinct. Contracts downloaded from the internet. Performance conversations handled with good intentions and no process.
That works… up to a point.
The point at which it stops working isn’t a specific headcount. It’s the moment when the absence of structure starts costing you: in time, in inconsistency, in decisions you can’t confidently stand behind, in people who don’t know where they stand.
If you are regularly spending time on people issues that feel urgent but reactive — the same conversations with the same people, questions you don’t know the answer to, situations you’re not sure how to handle and that’s the signal. Not because anything has gone catastrophically wrong, but because the absence of strategic HR thinking is quietly eating into your capacity to lead and grow.
The exhilHRate take: You don’t need to wait for a crisis to justify getting support. If people decisions are taking more time and energy than they should, that time and energy has a commercial cost. Do the maths.
When do you hire an HR consultant signal 2: You’re about to hire at pace
Growth is exciting. Growth without proper people foundations is expensive.
The most common and costly mistake fast-growth businesses make is scaling their headcount before scaling their HR thinking. Bringing in ten, twenty, thirty new people without a clear onboarding process, without defined culture standards, without a management framework and then wondering why six months later the team feels fragmented, performance is inconsistent, and the culture that made the business brilliant when it was small seems to have disappeared.
If you know a significant hiring phase is coming (and in a fast-growth business, it’s always coming) the time to invest in your people foundations is before the hires, not after.
A strategic HR consultant will help you build the framework your growth needs: hiring processes that find the right people, onboarding that lands them brilliantly, management standards that scale, and a culture that holds as the headcount grows.
The exhilHRate take: Think of strategic HR investment like infrastructure. You don’t build the roads after the traffic arrives. I wrote a blog about this last month, read it here: Hiring for Growth: The 7 People Decisions That Shape Your Culture Forever
When do you hire an HR consultant signal 3: Your managers are drowning or winging it
Here’s one of the most expensive and least visible problems in fast-growth businesses: managers who are brilliant at the job they used to do, promoted into leadership because they were the best person available and left entirely to figure out management on their own.
No framework. No development. No honest feedback about what good looks like. And a team underneath them that is either underperforming, disengaging, or quietly looking elsewhere while the founder wonders why the culture isn’t what it was.
Management capability is the multiplier in any growing business. A great manager makes their whole team better. A struggling manager – even one who is fundamentally a good person and a strong operator – can quietly undo months of hiring, culture-building and commercial momentum.
If your managers are spending more time firefighting than leading, if performance conversations aren’t happening, if your team feedback (formal or informal) suggests people aren’t getting what they need from their line managers and that’s a people strategy problem, not just a management problem. And it needs a strategic response.
The exhilHRate take: Management development isn’t a nice-to-have. In a fast-growth business, it is one of the highest-return investments you can make. If your managers aren’t being developed, your business is leaving performance on the table every single day.
When do you hire an HR consultant signal 4: Employment law is changing and you’re not sure where you stand
I’m going to be direct here: the employment law landscape in the UK right now is more complex and more consequential than it has been in years. Trust me, it is extensive and it changes all four corners of Employment Law as we knew it, as per ACAS: Employment Rights Act 2025.
From January 2027, unfair dismissal protection kicks in at six months of service (down from two years) and compensation awards are uncapped. From October 2026, harassment duties are significantly tightened. Day-one rights for sick pay and parental leave are already in force.
If you are growing fast, hiring regularly and managing performance without a proper framework, the window in which a mistake becomes a tribunal claim has narrowed dramatically.
This isn’t about being frightened into action. It’s about making sure that as your business grows, your people processes keep pace with your legal obligations and that you’re not leaving yourself exposed to risk that a relatively modest investment in strategic HR would entirely prevent.
The exhilHRate take: The cost of a tribunal claim – in time, management energy, legal fees and reputational damage – is almost always significantly higher than the cost of the HR support that would have prevented it. This is not a difficult equation.
When do you hire an HR consultant signal 5: You’re losing people you wanted to keep
Retention is one of the most telling indicators of how well a business is being led from a people perspective and one of the most expensive problems when it goes wrong.
If people are leaving and you’re not entirely sure why, or if the reasons you’re being given in exit interviews feel like surface-level politeness rather than honest feedback, or if there’s a pattern of departures that suggests something systemic rather than coincidental and that is a people strategy issue.
The cost of losing a strong employee is routinely underestimated. Recruitment costs, lost productivity during the gap, onboarding time for the replacement, the knowledge and relationships that walk out of the door, replacing someone typically costs between half and twice their annual salary, depending on seniority and role.
Strategic HR support doesn’t just help you retain people through better processes and culture. It helps you understand why you’re losing them, and fix the underlying causes rather than patching over the symptoms.
The exhilHRate take: If you’re regularly losing people you wanted to keep, the question isn’t just ‘how do we replace them?’ It’s ‘what is our business doing (or not doing) that is making it easier to leave than to stay?’
So: fractional, retained, or in-house?
Once you’ve decided that strategic HR support is the right move, the next question is what form it should take. Here’s how I think about it for fast-growth businesses.
A fractional or retained HR consultant is the right fit for most businesses scaling between roughly 10 and 100 people. You get senior, strategic people expertise without the overhead of a full-time hire. You can flex the level of support up and down as the business needs change. And you get someone who is genuinely invested in your commercial outcomes not just managing HR admin.
This is the model that most fast-growth businesses underutilise. They either try to manage without any proper HR support for too long, or they jump straight to hiring a junior in-house HR manager who doesn’t have the strategic experience the business actually needs at that growth stage.
An in-house Head of People starts to make sense when the volume and complexity of your people needs is consistent enough to justify a full-time hire, and when the business has the runway and the management infrastructure to support that person well. For most businesses, this is somewhere between 50 and 150 people, but it depends heavily on the pace of growth, the nature of the workforce, and the complexity of the people challenges you’re navigating.
Project-based support similar to an HR MOT, a people strategy review or a specific piece of work around management development or culture is the right entry point if you want to understand where you are before committing to ongoing support. It gives you a clear picture of your current people foundations, the gaps and the priorities, without a long-term commitment.
The exhilHRate take: The right model is the one that gives you the strategic people thinking your business needs, at the pace it’s growing, without either underinvesting in a function that drives your commercial outcomes or over-investing before you’re ready.
The question underneath the question
When founders ask me when they should hire an HR consultant, what they’re often really asking is: is our people situation serious enough to justify the investment?
Here’s how I’d reframe that.
Strategic HR isn’t a crisis response. It’s a growth enabler. The businesses that scale brilliantly, that build cultures people want to be part of, that retain their best talent, that avoid the expensive chaos of reactive people management are the ones that treat their people function as a commercial priority, not an administrative afterthought.
The question isn’t whether you can afford good HR support. It’s whether you can afford to keep scaling without it and that is when you hire an HR consultant – now.
3 things to do this week
1. Time-audit your people issues. For the last month, roughly how many hours have you or your leadership team spent on HR-related matters including performance, conflict, recruitment, absence, uncertainty about what to do? Put a number on it. That’s the cost of not having strategic support.
2. Ask yourself honestly: are my managers developing their teams or just managing them? If you’re not sure, that’s the answer.
3. Book a Power Hour. One focused conversation about where your business is, where it’s going, and what your people function needs to look like to get you there. No jargon, no HR waffle – just straight-talking, commercially-minded people strategy.
Amy Blick is the founder of exhilHRate, a strategic HR consultancy working with fast-growth, transformational businesses across the UK. If you’re not sure where your people foundations are right now, an HR MOT is the place to start. Or book a Power Hour and let’s have the conversation.
