Most solo mobile service operators reach a point where they are consistently busy, occasionally turning down work, and running at a pace that is not sustainable. The question of whether to hire is rarely about ambition - almost everyone wants to grow. It is about whether the numbers work, whether the timing is right, and whether the business is set up to support a second person productively. This is a look at the financial reality of employing someone in the UK, the honest signals that indicate readiness, and the questions that often get asked too late.
The Real Cost of Employment in the UK
The headline salary is not the total cost. For a UK employer in 2026, the full cost of an employee includes:
| Cost Component | Detail |
|---|---|
| Gross salary | Whatever you agree - but the National Living Wage sets the floor (£12.21/hour for over-21s from April 2025) |
| Employer National Insurance | 15% on earnings above £5,000/year (from April 2025). On a £30,000 salary: approximately £3,750/year |
| Employer pension contribution | Minimum 3% of qualifying earnings under auto-enrolment (£6,240 to £50,270 band). On £30,000: approximately £718/year |
| Statutory holiday | 5.6 weeks per year (28 days including bank holidays for full-time). This is paid time when the employee is not working. |
| Statutory sick pay | £116.75/week (2025/26 rate) payable from day 4 of absence, for up to 28 weeks |
| Recruitment | Advertising, trial period time, agency fees if used |
| Equipment and tools | Van, uniform, PPE, hand tools, software licence |
| Insurance | Employer's liability insurance is a legal requirement from day one (minimum £5 million cover) |
A rough rule of thumb: budget for 1.25x to 1.35x the gross salary as the true employment cost before equipment. On a £30,000 salary, the real cost to the business is typically £37,500-£40,500 per year, before tools, uniform or van.
Employer's liability insurance is a legal requirement in Great Britain the moment you have an employee. Cover must be at least £5 million. You can be fined £2,500 for every day you operate without it. Notify your insurer before your first employee starts.
The Billable Capacity Calculation
Before hiring, the fundamental question is: do you have enough work to keep a new person productively billable?
A field technician is rarely billable for 100% of their working hours. Travel, admin, training, and quiet periods all reduce chargeable time. A realistic billable utilisation for a field technician in a mobile service business is typically 65-75% of a working week.
At 37.5 hours per week, that means roughly 24-28 billable hours per week. At a blended rate of, say, £45/hour, that is £1,080-£1,260 per week in potential revenue - or roughly £50,000-£58,000 per year, assuming 47 working weeks (excluding holiday and bank holidays).
Compare that against the all-in employment cost. If the numbers leave a reasonable margin - after accounting for your own labour cost, materials, and overhead - the financial case is there. If the projected billable revenue only just covers the employment cost, the hiring is not ready yet.
6 Honest Signals You Are Ready
- You are consistently turning down work. Not occasionally declining a job because the timing is awkward - but regularly saying no to enquiries you would otherwise take, because there is genuinely no room in the diary. If this is happening most weeks, the capacity case is real.
- You have enough recurring work to fill a second diary. New enquiries alone are not a reliable foundation for employment. Recurring customers, service contracts, and ongoing relationships give you predictable demand that a second technician can build on. A diary that is full because of one large client is a riskier basis than one filled by many customers.
- You are working hours that are not sustainable. Consistently working 55-60+ hour weeks, including evenings and weekends, is a signal that you have more demand than your current capacity can serve. The question is whether the demand is structural (it will stay) or temporary (a busy period that will ease).
- You cannot take holiday without stopping the business. If a week off means a week with zero income and a backlog on your return, you have a single-point-of-failure business. A second person changes this - and eventually makes the business more saleable, because buyers discount heavily for key-person dependency.
- You are losing jobs to response time, not price. If customers are going to competitors because you cannot get to them quickly enough - rather than because your quote was too high - the constraint is capacity, not pricing or quality.
- You have a cash buffer to carry the first three months. An employee costs money from day one. Revenue from the additional capacity takes time to materialise and takes even longer to consistently exceed the employment cost. You need a cash buffer - typically three months of the employment cost - to absorb the gap. If your cash position cannot carry that, the timing is wrong regardless of the demand signals.
Employee vs Subcontractor: The Honest Comparison
Many mobile service businesses use self-employed subcontractors before (or instead of) their first employee. The trade-offs are real:
The "deemed employment" risk
HMRC looks at the substance of a working relationship, not just what the contract says. If a subcontractor works exclusively for you, on your equipment, at times you dictate, and cannot send a substitute - that looks like employment. The legal and tax risk from misclassification sits with you as the engager. If you regularly use the same person on an exclusive basis, take advice on whether the relationship should be formalised as employment.
What You Need to Have in Place Before Day One
- Employer's liability insurance (legal requirement)
- PAYE registration with HMRC (do this before the employee starts)
- Auto-enrolment pension scheme set up (a staging date is assigned by The Pensions Regulator)
- A written employment contract issued no later than day one
- A right to work check for the employee (UK law requires this)
- A health and safety risk assessment updated to reflect an employee
- Payroll software or an accountant to run PAYE
- Any training or certification requirements confirmed (Gas Safe, NICEIC, etc.)
Bottom Line
Hiring is the right decision when the demand is structural, the cash position can absorb the gap between cost and revenue, and the business is operationally ready to support a second person. It is the wrong decision when it is driven by a temporary peak, by pressure, or by the feeling that something needs to change without the numbers to back it up.
The honest test: if the new hire was at 70% billable capacity for the next twelve months, would the financial model work? If yes, and the demand signals are consistent, the case is there. If the answer depends on everything going well, it is worth waiting until the demand base is more established.
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