Economies of scale in outsourcing: why providers cost less

Key takeaways

Economies of scale in outsourcing mean a provider can run the same work for less because it spreads fixed costs across many clients. Supervision, quality checking, recruitment, training, cover and software are shared. A small business cannot employ a sixth of a team leader. Through a provider, it can buy exactly that.

• Providers share supervisors, cover and tools across many clients.
• A small firm buys a fraction of roles it could never employ.
• Holiday and sickness cover comes from a pool, not from overtime.
• Scale helps only if the provider passes it on in price or quality.

What are economies of scale in outsourcing?

Economies of scale are the fall in cost per unit that comes from doing more of the same thing. In outsourcing, the provider's costs for management, premises, systems and recruitment are divided across hundreds of seats, so each seat carries a small share. An in-house team of two or three carries all of those costs alone.

• How BPO can help businesses reduce operational costs
• What is BPO and how can it help UK businesses?

Which costs does a provider share?

A provider shares the costs that come in whole units and are under-used by any single small team. The clearest is supervision: one team leader can look after around 10 to 12 people, so each seat pays for a fraction. The same applies to quality checkers, trainers, recruiters, IT support and workforce planning.

• Supervision: a team leader shared across a floor.
• Quality: dedicated reviewers who sample work daily.
• Recruitment and training: a pipeline that runs all year.
• Cover: a pool to fill holiday, sickness and leavers.
• Tools: telephony, ticketing and security bought at volume.

• Overhead cost per employee in the UK: what to add
• Quality assurance for outsourced teams

What does that mean in numbers for a small firm?

Take an illustrative UK firm with two administrators. Supervising them takes the owner about four hours a week. Valued at an illustrative £40 an hour, that is £8,320 a year of management for two people. A provider's team leader covering 12 seats spreads a similar cost so that each seat carries a twelfth.

Cover works the same way. With 28 days of statutory holiday and an average of 4.4 days of sickness absence per worker in the UK in 2024 (ONS), each employee is away more than six weeks a year. A team of two has no slack to absorb it. A pool does.

• Staff utilisation rate: the cost of paid idle time
• The true cost of an employee in the UK

Do economies of scale ever run out?

Yes. Scale stops helping when the provider becomes so large that small clients get little attention, or when your work is so specific that nothing can be shared. A specialist process run by two trained people on a large provider's floor gains the building and the tools but not the pooled knowledge.

Bigger is not automatically cheaper for you. A mid-sized provider with relevant experience often passes on more of the benefit than a very large one.

• Diseconomies of scale: when a bigger team costs more
• When is in-house cheaper than outsourcing?

How do you check you are getting the benefit?

Check that the price includes the shared services and that you can see them working. Ask who supervises your seats and how many others they manage, how cover is provided, how often work is sampled, and what tools are included. If each of those is charged as an extra, the scale benefit is staying with the provider.

• Named team leader and their span of seats.
• Cover policy for holiday, sickness and leavers.
• Quality sampling rate and who does it.
• Tools and licences included in the rate.

• How to compare outsourcing quotes like for like
• The hidden costs of outsourcing

What does this look like in practice?

A pattern we see in firms with a single administrator: when that person takes two weeks of holiday, the owner does the job in the evenings and a backlog builds anyway. Moving the work to a managed team does not just change the hourly cost. It removes the fortnight every year when the business runs at half speed.

• See client work
• BPO Solutions for UK businesses

Economies of scale checklist

Use these questions when comparing a provider with your own team.

• How many hours a week do you spend supervising routine work?
• Who covers holiday and sickness today, and at what cost?
• What do you spend each year on recruitment and training?
• Which tools are licensed for only one or two users?
• Is the provider's supervision included in the rate?
• How many clients share the team leader?

• Labour arbitrage: how much of the BPO saving is wage rates?
• The cost lever scorecard: find savings process by process

Next step

Tell us how many people do routine work in your business and who manages them. We will show you which costs you are carrying alone and what sharing them would change.