Why Hiring Another Admin Assistant Might Be Your Most Expensive Mistake

Your team is stretched. The to-do list is growing faster than anyone can keep up. The natural reaction is to hire another pair of hands.

Before you post that job advert, run the numbers. Because when you add up every cost of bringing someone new on board, the total is often two to three times what you expect. And for many of the tasks on that growing to-do list, there is a faster, cheaper, and more reliable alternative.

The True Cost of Hiring an Admin Assistant in the UK

Let us start with salary. The average administrative assistant in the UK earns around £26,000 per year. For a cleaning coordinator, it is closer to £29,340. For a bookkeeper, £32,290.

Those are just the starting numbers.

Employer’s National Insurance

From April 2025, employer’s NI sits at 13.8% on earnings above the secondary threshold of £9,100 per year. On a £26,000 salary, that adds roughly £2,332.

Workplace Pension

The legal minimum employer contribution is 3% of qualifying earnings (earnings between £6,240 and £50,270). On a £26,000 salary, that is approximately £593 per year.

Recruitment Costs

Finding the right person is not free. The Recruitment and Employment Confederation puts the average cost of hiring for a standard role at £3,000–£6,000, including job adverts, agency fees (typically 10–20% of first-year salary), interview time, and background checks.

Spread over an average tenure of 2–3 years, that is £1,000–£3,000 per year.

Training and Onboarding

New hires do not arrive fully productive. Expect 3–6 months before they are working at full speed. During that time, they are costing you their salary while delivering a fraction of their potential output.

Budget £2,000–£4,000 for direct training costs (time from existing staff, materials, external courses). Add the indirect cost of reduced productivity during the ramp-up period, and the true figure is higher.

Equipment and Software

Desk, chair, laptop, monitor, phone, software licences. A conservative estimate: £1,500–£2,500 at setup, plus £500–£1,000 per year for software subscriptions and replacements.

Holiday and Sick Pay

Your new hire is legally entitled to 28 days of paid holiday (including bank holidays). The CIPD reports that the average UK employee also takes 7.8 sick days per year.

That is 35.8 days — over 7 working weeks — where you are paying full salary for no output. You either absorb the work gap, pay overtime to cover it, or hire a temp.

Staff Turnover

Here is the one that catches most employers off guard. Admin roles have high turnover — the average tenure for administrative staff in the UK is around 2–3 years. Some sectors are worse: cleaning businesses see 200–400% annual staff turnover.

Every time someone leaves, you go back to the beginning: recruitment, training, productivity loss. The CIPD estimates that the average cost of employee turnover is £6,125 per leaver for roles at this level.

The Full Picture

And that is a conservative estimate for a £26,000 role. For a bookkeeper at £32,290, the total climbs above £40,000.

What Does Automation Cost?

ClearRun’s plans:

• Streamline (1–5 people): From £350/month = £4,200/year
• Transform (growing businesses): From £750/month = £9,000/year

Even at the higher end, automation costs less than a quarter of a new hire. And it works 24/7, does not take holidays, does not get sick, and does not hand in its notice after 18 months.

Side-by-Side Comparison

The Alternative: Automate First, Hire for What Is Left

We are not saying you should never hire. Some tasks need a real person. But the smartest approach is to automate the repetitive, rule-based work first, then hire for what remains.

Here is what that looks like in practice:

Before automation: You hire an admin assistant. They spend 60% of their time on data entry, invoice processing, and chasing clients. They spend 40% on tasks that genuinely need human judgement — handling client queries, managing complex situations, building relationships.

After automation: The 60% is handled by systems. You either do not need to hire at all, or you hire for a more skilled (and more fulfilling) role that focuses on the 40% that requires human input.

The result: lower costs, better use of talent, and a team that is doing meaningful work instead of typing numbers into spreadsheets.

Addressing the Objection: “But I Need a Real Person”

This is the most common pushback, and it is worth taking seriously. There are absolutely tasks where a human is the right choice.

Hire a person when:

• The task requires complex judgement that changes case by case
• Client or customer relationships depend on personal interaction
• The work involves creative problem-solving or strategic thinking
• Emotional intelligence is a core requirement (handling complaints, sensitive conversations)
• The task is genuinely unpredictable and cannot be defined as a set of rules

Automate when:

• The task follows the same steps every time
• It involves moving data from one place to another
• It is triggered by a predictable event (invoice due, record not received, schedule change)
• Speed and accuracy matter more than nuance
• The volume is high enough that doing it manually creates a bottleneck

Most businesses have a mix of both. The mistake is hiring a person to do 100% of the work when 60–70% of it could be automated.

When Hiring IS the Right Choice

To be clear: we are not anti-hiring. There are situations where a new team member is exactly what you need.

• You need advisory capacity. An automation cannot replace a qualified accountant advising a client on tax strategy.
• You need on-site presence. A cleaning business expanding to new sites needs supervisors and team leaders who can be physically present.
• The work is genuinely complex. If every task requires human judgement, automation will not replace it.
• You need leadership and management. Building a team and developing people is inherently human.

The point is not “never hire.” It is “do not hire for tasks that a system could do better, faster, and cheaper.”

A Practical Framework

Next time you are thinking about hiring, ask yourself these three questions:

1. If I listed every task this person would do, what percentage is repetitive and rule-based? If it is above 50%, explore automation first.
2. Would I still need this hire if the routine work was automated? If not, the answer is clear. If yes, you might need both — but the hire will be more productive and more engaged if they are not buried in admin.
3. What is the fully loaded cost of the hire versus the cost of automating? Use the ROI framework from our automation ROI guide to run the numbers.

For a deeper look at what manual processes really cost, including the error rates and downstream impacts that do not show up on a payslip, read our breakdown of the true cost of manual data entry.