In-House HR vs Outsourced HR: What’s the Real Cost for UK SMEs?

As your business grows, people challenges become more complex.

You move from:

• Informal conversations

• Template contracts

• “We’ll deal with it later” policies

To:

• Performance management issues

• Sickness absence cases

• Compliance risk

• Employee relations complexity

• Retention concerns

At that point, many founders and directors ask:

Should we hire an in-house HR manager — or outsource HR support?

This guide breaks down the real cost of both options for UK SMEs.

The Cost of Hiring an In-House HR Manager (UK)

For a growing SME, the average salary of an HR Manager in the UK ranges between:

£45,000 – £60,000 per year

But salary is only part of the story.

True Annual Cost Breakdown

Cost Element	Estimated Cost
Salary	£45,000 – £60,000
Employer NI & pension	£6,000 – £8,000
Benefits / bonus	£3,000 – £5,000
Recruitment fees (one-off)	£8,000 – £12,000
HR software & systems	£3,000 – £6,000
CPD & training	£1,500+

Total First-Year Cost:

£65,000 – £85,000+

And this assumes:

• You hire the right level of experience

• They are operational immediately

• There are no capability gaps

• They stay long-term

For many businesses under 80 employees, this represents a significant fixed overhead.

The Cost of Outsourced HR / Fractional HR Support

Outsourced HR allows you to access senior-level expertise without permanent headcount.

At Grigg HR, our benchmark day rates are:

• £550–£650 per day for ongoing fractional HR support

• £650–£800 per day equivalent for short, outcome-driven diagnostics Grigg HR

  
  

But unlike hiring in-house, you only pay for the time and expertise you actually need.

Example: Fractional HR Partner (2 Days per Week)

£600 per day × 2 days × 48 weeks = £57,600 annually

This provides:

• Senior-level expertise

• Strategic HR oversight

• Compliance assurance

• Manager support

• Employee relations handling

• Scalable commitment

With no:

• Employer NI

• Pension contributions

• Recruitment fees

• Long-term employment liability

• Risk of under-hiring

If your requirement is lighter — for example, 1 day per week — annual cost reduces to approximately £28,800.

Why Fractional HR Makes Commercial Sense for Scaling Businesses

Outsourced HR is particularly effective when:

• You have 15–150 employees

• People issues are increasing but not daily

• You need senior judgement, not junior admin

• You want flexibility

• Cash flow discipline matters

Grigg HR was built specifically for early-stage and scaling organisations not yet ready for a full in-house HR or L&D team.

At Grigg HR we focus on:

• Clarity over complexity

• Outcomes over activity

• Solving people problems before they become costly issues

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When In-House HR Is the Right Move

Outsourced HR is not a permanent substitute for internal capability.

Hiring in-house typically becomes commercially viable when:

• You exceed 150 employees

• You require daily on-site HR presence

• Operational casework is constant

• Your revenue supports stable fixed overhead

At that stage, fractional support may transition into building your internal function, and when you are ready we will know you business and we can help you recruit our replacement.

The Hidden Cost of Getting HR Wrong

The real financial risk for SMEs is not the cost of HR. It’s the cost of:

• Employment tribunals

• Poorly handled disciplinaries

• High attrition

• Weak management capability

• Compliance breaches

• Damaged culture

These issues often exceed the cost of proactive senior HR support.

HR removes risk. Strong people leadership removes friction.Together, they protect sustainable growth and that is what you get with Grigg HR.

In-House HR vs Outsourced HR: Quick Comparison

Factor	In-House HR	Outsourced / Fractional HR
Fixed Cost	High	Flexible
Recruitment Risk	Yes	No
Employment Liability	Yes	No
Scalability	Low	High
Senior Experience	Varies	Immediate
Cash Flow Flexibility	Low	Strong

Which Option Is Right for Your Business?

If you are:

• Scaling rapidly

• Managing risk reactively

• Unsure whether you need full-time HR

• Wanting commercial clarity before committing to headcount

Fractional HR is often the smarter first step.

Grigg HR provides practical, senior-level HR support designed specifically for UK SMEs navigating growth — without the cost or complexity of a full in-house function

Speak to Grigg HR

If you’d like to understand:

• What level of HR support your business truly needs

• Where your current risk exposure sits

• Whether fractional HR would be more commercially viable

We’re happy to have a straightforward conversation.

Clarity first. Commitment second.