HR for small businesses in the UK — what you actually need at each stage

One of the most common things we hear from founders and leaders of growing businesses is some version of: "I know we need to sort our HR, but I don't know where to start, and I don't want to overdo it."

That's a completely reasonable place to be. HR has a habit of feeling either too vague ("culture transformation") or too bureaucratic ("policy for every scenario"). What most small businesses actually need is something in between — practical, proportionate, and relevant to where you are right now.

Here's a straightforward guide to what HR tends to look like at different stages of growth — and what's actually worth prioritising.

Stage 1: The early days (roughly 1–15 people)

At this stage, you probably don't need a full HR function — but you do need to get a few basics right and ensure that you are staring to build the right People practices for the business you want to be..

What you need:

•       Written contracts of employment for everyone — these are a legal requirement in the UK from day one of employment

•       A basic set of policies: disciplinary and grievance procedure, sickness absence policy, and a few others depending on your business

•       A clear process for onboarding new starters — even a simple checklist makes a big difference

•       A basic understanding of your legal obligations as an employer (holiday entitlement, statutory sick pay, right to work checks, and so on)

Most businesses at this stage get these in place and that's enough for a while. The goal is to be legally compliant and treat people fairly, without creating unnecessary overhead.

Stage 2: Starting to scale (roughly 15–50 people)

This is where things tend to get more complicated — and where a lot of businesses start to feel the strain. At 15–20+ people, word-of-mouth and founder instinct stop being enough to hold the culture together. You've probably also got managers who are managing people for the first time, and that creates its own set of challenges.

What you need:

•       A more structured approach to hiring — consistent process, clear criteria, and a good candidate experience that reflects your brand

•       A performance management approach that's actually useful — not just annual reviews, but regular conversations that help people develop and know where they stand

•       Manager support — your managers are probably brilliant at their actual jobs, but managing people is a different skill. Some guidance, coaching or training goes a long way

•       A clearer sense of your culture and values — not a poster on the wall, but what it actually means for how you hire, how you make decisions, and how you behave under pressure

•       More robust people data — who's in the business, what roles look like, where the gaps are

This is often the stage where businesses bring in a fractional HR consultant to build their people infrastructure properly because the founder or COO simply can't keep carrying it all.

Stage 3: Growing with intent (roughly 50–100 people)

By this point, the people side of the business is a real discipline — not an afterthought. The businesses that get this stage right are usually the ones who've been thoughtful about culture from the start and are building on solid foundations. The ones who struggle are often dealing with the consequences of earlier shortcuts.

What you need:

•       A genuine people strategy — connected to where the business is going, not just a list of HR initiatives

•       Talent development: career paths, learning opportunities, a way for people to grow within the business (rather than leaving to do it elsewhere)

•       A leadership team that's actively developing — leadership capability becomes a real competitive advantage at this stage

•       Employer brand — how you present yourselves to candidates, and whether what you say matches what it's actually like to work there

•       Better use of data — understanding retention, engagement, performance trends across the business

•       If you're going through specific change (a restructure, a merger, a new market) — proper change management, not just an announcement email

A few things that are true at every stage

Generic HR rarely fits

A professional services firm, a creative agency, and a health tech company might all have 40 people — but their cultures, their ways of working, and what their people need are completely different. HR that doesn't account for that context tends to create friction rather than solve problems.

Compliance is the floor, not the ceiling

Being legally compliant is necessary — but it's not the same as having good HR. The businesses that get the most from their people are the ones that go beyond compliance to think about how they actually want people to experience working there, and the results they want them to deliver.

The best HR feels like it belongs

The most effective people practices are the ones your team actually uses and believes in — because they make sense in the context of how you work. If your HR feels bolted on or like it belongs in a different kind of company, it won't land. That's why tailoring matters.

Don't overengineer it

One of the most common mistakes is building HR processes that are more complicated than the business needs. A 10-step performance review for a 20-person company is going to sit in a drawer. Aim for the lightest-weight solution that actually does the job.

That's why a good HR engagement has a clear scope — what will be built, what it will enable, and what's out of scope for now. It's a discipline that stops the work drifting and keeps the focus on what will actually make a difference

Not sure where your business sits?

Most growing businesses are somewhere in between stages — or dealing with a specific challenge that doesn't fit neatly into any category. That's completely normal. The important thing is to get a clear picture of where you are now, what's working, and what's creating friction or risk.

At Companies in Balance, we start every engagement with a People Roadmap: a structured diagnostic that gets clear on where you are now, what's most important to tackle, and what outcome you need to hit your goals. It means you invest in what your business actually needs at this stage — nothing more, nothing less. We work with UK businesses of 10 to 100 people. Get in touch to find out more