The Maths Have Changed
For decades, if you wanted someone to answer your phone, you hired a receptionist. Now there is an alternative that is meaningfully better on cost, availability, and consistency — while being genuinely comparable on quality for most routine calls.
This is not about replacing people with machines. It is about honest maths.
The True Cost of a Receptionist in the UK (2025)
Most businesses underestimate what a receptionist actually costs:
| Cost Item | Annual Cost |
|---|---|
| Salary (average UK) | £24,000–£28,000 |
| Employer NI (13.8%) | £3,300–£3,900 |
| Pension (minimum 3%) | £720–£840 |
| Holiday pay (5.6 weeks) | £2,600–£3,000 |
| Sick days (average 6.7/year) | £660–£770 |
| Recruitment cost | £1,500–£3,000 (amortised) |
| Training | £500–£1,500 |
| Total annual cost | £33,000–£41,000 |
That is £2,750–£3,400 per month for a receptionist who works 9am–5:30pm, five days a week.
What about evenings, weekends, bank holidays, lunch breaks, sick days, and annual leave? During those windows, your phone goes unanswered.
The Cost of an AI Phone Answering System
| Setup | Monthly Cost |
|---|---|
| Basic AI inbound agent | £150–£300/month |
| AI + appointment booking | £200–£450/month |
| AI + outbound follow-up | £350–£600/month |
Setup fees typically range from £500–£2,000, which most businesses recover within 1–2 months.
What you get for £200–£450/month:
- •24/7 phone answering — including evenings, weekends, and bank holidays
- •Zero sick days or annual leave
- •Consistent, scripted responses every time
- •Automatic appointment booking direct to your calendar
- •Call summaries emailed to you after each call
- •No recruitment, no training, no employer NI
Where AI Cannot Yet Replace a Human
An honest comparison acknowledges the limitations:
- •Complex emotional situations — a distressed customer, a complaint requiring genuine empathy, a sensitive medical conversation
- •Novel situations — scenarios outside the AI's training that require human judgement
- •Relationship building — a dedicated account manager who knows the client personally
The right answer for most UK businesses is not either/or. It is AI as the first line — handling the 70–80% of routine calls automatically — with humans available for the 20–30% that require genuine human judgement.
Who Should Consider an AI Phone Answering System?
Strong fit:
- •Businesses receiving 20+ calls per day with repetitive patterns
- •Companies losing revenue to missed after-hours calls
- •Practices and clinics where appointment booking is the primary call type
- •Businesses that have struggled to retain good reception staff
Poor fit:
- •Businesses where every call is unique and complex
- •Client-facing work where relationship continuity is the core product
- •Industries with strict regulatory requirements around automated handling
Making the Switch
Most businesses start by running AI alongside their receptionist for a month. The AI handles overflow and after-hours calls. Once you see how it performs with real callers, you make an informed decision about how much to expand the role.
Book a free discovery call with BigBerri. We will assess your call patterns and give you an honest view of whether an AI phone answering system makes sense for your business.
Frequently Asked Questions
How much does an AI phone answering service cost per month in the UK?
Basic AI inbound answering costs £150–£300/month. With appointment booking integration, typically £200–£450/month.
Can AI replace a receptionist completely?
For routine calls (bookings, FAQs, routing) — yes. For complex or sensitive conversations, the AI transfers to a human. Most businesses use AI for 70–80% of calls.
How long does it take to set up an AI phone answering system?
Typically 1–3 weeks from first call to going live, including testing and integration with your calendar or CRM.