Making the Move to In-House Talent Acquisition: What CleanTech Scale-Ups Need to Get Right

The question that starts forming

Hiring has been running at pace. Roles have been filled, the team is broadly in place, and the pressure that was acute six months ago has eased. But the business is still growing, roles keep opening, and in the background a new question is forming: at what point does it make sense to build something permanent inside the business, rather than reaching for external resource each time a role opens?

It's not usually a moment of crisis, arriving gradually, as a sense that the current model has done its job and that the next stage of the business probably needs a different approach to hiring. This is the moment the move beyond founder-led hiring feels complete, and in-house talent acquisition starts to feel like the right next move.

Getting that move right depends less on timing than on what's already in place when the first internal hire arrives.

What the volume threshold actually means

Below roughly 15 roles per year, the flexibility of external hiring support more often than not outperforms the fixed cost of a dedicated internal hire. The ability to scale up and down with demand, without carrying a permanent salary, makes external resource the more efficient model at lower volumes.

Once a CleanTech scale-up reaches 15 to 20 hires annually, the economics change. A first internal TA hire at Head of Talent or Talent Acquisition Manager level typically costs £58,000 to £90,000 in base salary in the UK, rising to £70,000 to £110,000 fully loaded with employer NI, on-costs, tools, and job boards. At that fixed cost, the hiring volume needs to be consistent and sustained to justify the model.

The question is less about whether the business has crossed a threshold and more about whether the pace of hiring is likely to continue at a level that makes a permanent internal resource the more efficient choice over the long run. For companies in a sustained growth phase, the answer is generally yes. The variable that determines whether the transition succeeds is not the decision to make it, but what the first hire finds when they arrive.

Source: Talhive, Embedded Recruiter vs Agency vs In-House: The Cost Model, April 2026. Glassdoor UK, Head of Talent salary data, October 2025.

What the first hire needs to walk into

The difference between a transition that works and one that stalls is almost always what the first internal hire finds on day one. This is not about the quality of the person, but it is about what already exists for them to operate within.

A business where hiring has been run with discipline, where role briefs are documented before any search opens, candidates are assessed against consistent criteria, pipelines are reported clearly, and hiring managers are already engaged in a structured process, gives that person the foundations to focus on delivery from the start. Where those things don't exist, the first hire is asked to build before they can deliver, at a fully loaded cost of £70,000 to £110,000 per year while they do it.

The infrastructure itself is not complicated. Written briefs that capture what the role actually needs before any search opens. A consistent way of evaluating candidates across different roles and hiring managers. A pipeline that leadership can read without having to ask for a status update. Data on time-to-hire and cost-per-hire that already exists rather than needing to be built from scratch. These are the components of hiring as operational infrastructure, and they are also the things most commonly absent when a first internal TA hire joins a business that has been running hiring reactively.

When this infrastructure exists, the first internal hire can operate at pace from the moment they arrive. When it doesn't exist, the first six months are foundational rather than productive, and the business is paying a permanent salary for work that external support could have completed before the hire was made.

What the business is actually hiring for

The first internal TA hire is often scoped as a recruiter: someone to fill the open roles, keep things moving, and take the pressure off the founding team. That's an understandable brief, but it conflates two different things.

A recruiter fills roles. A TA hire owns the process that makes every subsequent hire faster, more consistent, and cheaper to run. These are not the same job, and confusing them is one of the more common reasons first internal TA hires underperform against expectations. The business expects delivery at pace. The hire finds there is no consistent process to operate within, so they build one before they can deliver within it. The two things happen sequentially rather than in parallel, and the business wonders why hiring hasn't improved as quickly as it hoped.

A business with a repeatable hiring process already in place is hiring someone to own and operate it. A business without one is hiring someone to build it from scratch, which is a different brief, a different seniority of hire, and a different first year entirely. Defining clearly what the role actually is before making the hire changes both who gets hired and what the first six months look like.

What a clean handover looks like

When the transition to in-house talent acquisition works well, it should look fairly specific. Process documentation that exists and is already in use rather than described verbally during a handover conversation. Brief templates the new hire can pick up and apply immediately. Assessment criteria that are already consistent across the hiring team rather than varying by hiring manager. Pipeline reporting that leadership can read without interpretation. Hiring manager relationships that are already established and functioning across the business.

A first internal TA hire who walks into this can direct their energy toward delivery from day one. The foundations are already there. The institutional knowledge about how the business hires, what good looks like in each function, and where the process has historically broken down is already documented rather than sitting in someone's head or spread across a series of agency relationships.

The move to in-house talent acquisition is not in itself a difficult one. For CleanTech scale-ups at this stage of growth, it's the natural next step in building a hiring function that reflects where the business is going rather than where it's been. The question is only whether the groundwork is already done when the hire arrives, or whether they're the ones who have to do it.

The moment the handover actually happens

In practice, the transition from external hiring support to an internal hire isn’t often a clean break. The more effective version tends to be a period of overlap: the embedded hiring support and the new internal hire working in parallel long enough for the institutional knowledge to transfer properly. Not just the documentation, but the context behind it. Why certain roles are briefed the way they are. Which hiring managers need more structure and which need less. Where the process has historically slowed down and what was done to fix it.

When that overlap is built into the transition plan, the internal hire arrives informed rather than starting from zero. They inherit a functioning system with the people who built it still available to explain it. The handover conversation becomes a briefing rather than an archaeology project. To get this right, treat the transition not as the moment external support ends, but as the final deliverable of it.

The transition to in-house TA rarely fails because the wrong person was hired. If it fails there’s a good chance it’s because they arrived before the process was ready for them to take over.