Every growing London business reaches the same fork in the road. Do you hire your own cleaner and keep it in-house, or bring in a professional contractor?
Most people make the decision by comparing an hourly wage to a monthly contract price, then picking the cheaper number. It feels logical, but it is the wrong comparison, and it usually leads to the wrong answer.
This guide breaks down what each model really costs and involves for a London office, covering the hidden expenses, the control trade-off, staff cover, compliance, and the local factors that tip the balance. By the end, you will know which model fits your business.
Quick Answer
In-house office cleaning gives you direct control, but you carry every cost and responsibility: wages, National Insurance, pension, holiday and sick pay, equipment, cover for absence, and management time. Outsourcing bundles all of that into one predictable fee, with guaranteed cover and compliance handled for you. For most mid-size and multi-site London offices, outsourcing works out cheaper and simpler. In-house can suit a small single office with simple needs and spare management capacity.
Key takeaways
- The wage is not the cost. In-house cleaning carries National Insurance, pension, holiday and sick pay, equipment and management time on top of salary.
- Outsourcing is predictable. One fee covers labour, supplies, cover and compliance.
- Cover is the hidden dealbreaker. With in-house staff, every sick day and resignation is yours to solve. A contractor guarantees cover.
- Compliance sits with the employer. Outsourcing shifts COSHH, RAMS and insurance responsibility to the provider.
- London changes the maths. Higher wage expectations, the Real Living Wage and multi-site portfolios usually favour outsourcing.
What each model actually means
The two options are simpler to define than to compare.
In-house cleaning means the cleaner is your employee. You recruit them, train them, supervise them, pay their wage and benefits, buy the equipment, and arrange cover when they are off.
Outsourced cleaning means a contractor supplies trained, vetted staff under a service agreement. They handle recruitment, training, scheduling, supervision, equipment, supplies and cover, and you pay one agreed fee.
The difference is not really about who holds the mop. It is about who owns the system behind the work.
The real cost comparison
This is where the wage-versus-contract comparison falls apart. A cleaner’s salary is only the visible tip of the in-house cost. Once you add everything an employer is legally and practically responsible for, the picture changes.
| Cost factor | In-house (you pay) | Outsourced (included) |
| Wages / salary | Yes | Maintains overall hygiene on a day-to-day basis |
| National Insurance | Yes | Carried out daily or weekly on a fixed schedule |
| Pension auto-enrolment | Yes | Focuses on high-use spaces, desks, and communal areas |
| Holiday & sick pay | Yes | Keeps the workplace presentable for staff and visitors |
| Equipment & machinery | Yes, upfront | Provided |
| Supplies & consumables | Yes, ongoing | Usually provided |
| Cover for absence | Your problem | Guaranteed |
| Management & supervision | Your time | Handled by provider |
| Insurance & compliance | Your liability | Carried by provider |
| Training | Your cost | Handled by provider |
When you total the real cost of employing someone directly, the “cheaper” in-house option is often more expensive than a contract, especially once management time is valued properly. For a fuller breakdown of what drives price, see our guides on the factors that affect office cleaning cost and how much office cleaning costs in London. It is also worth remembering the cost of not cleaning your office to a professional standard.
Control versus consistency
The strongest argument for in-house cleaning is control. Your cleaner is on site, on your schedule, and answers to you directly.
The strongest argument for outsourcing is consistency. A good contractor delivers a reliable standard through documented systems, supervision and quality checks, not through one individual’s good day. If that person leaves, the standard does not leave with them.
The honest trade-off is this: in-house feels more controllable, but outsourcing is usually more consistent. For most offices, consistency is what tenants, staff and visitors actually notice.
Cover, turnover and reliability
Cleaning is a high-turnover sector, and this is where in-house models quietly cost the most.
With an in-house cleaner, every sick day, holiday and resignation is yours to manage. One person off means either a dirty office or a scramble to find cover. Recruitment is slow and expensive, and standards dip during every gap.
A contractor absorbs all of that. Absence is covered from a wider team, and turnover is the provider’s problem to solve, not yours. Our post on why professional office cleaning matters covers why that reliability compounds over time.
Compliance and health and safety
Cleaning involves chemicals, equipment and wet floors, so it carries real health and safety obligations. These include COSHH assessments for cleaning products, method statements, safe equipment use, and the right insurance.
With in-house staff, that responsibility and liability sit with you as the employer. With a contractor, they carry the RAMS, the COSHH compliance and the insurance as part of the service. For office managers already stretched across facilities, that is a meaningful load off. See how office cleaning contracts support health and safety compliance for more.
The London factor
Location changes the calculation, and London changes it more than most.
Wage expectations are higher in the capital, and the Real Living Wage matters both for recruitment and for your own ESG credentials. Employing cleaners directly at a fair London wage, with all the on-costs, adds up quickly. A Living Wage accredited contractor lets you meet that standard without carrying the employment burden yourself.
London businesses also tend to run multiple sites, and managing in-house teams across several offices multiplies every problem above. One contract across all of them removes that admin entirely. We cover this in our posts on managing multi-site cleaning through one contract and how office cleaning supports your ESG goals.
So which should you choose?
There is no single right answer, only the right fit for your situation.
In-house may suit you if: you run a single small office with simple, predictable needs, you have genuine spare management capacity, and staff turnover in your area is low.
Outsourcing usually wins if: you have a mid-size or larger office, you run more than one site, you value predictable costs, or you would rather not carry the recruitment, cover and compliance burden.
Some larger organisations run a hybrid: a small in-house presence for daytime touch-ups, with a contractor handling the main clean and specialist work. For most London offices, though, a single outsourced contract is the simpler and more cost-effective route.
Frequently asked questions
For most mid-size and multi-site London offices, outsourcing is cheaper once you account for National Insurance, pension, holiday and sick pay, equipment, cover and management time. In-house can be cheaper only for a small office with very simple needs.
Possibly. TUPE (the Transfer of Undertakings regulations) can apply when in-house cleaning staff are moved to an incoming contractor, meaning their employment may transfer with them. A good contractor will guide you through this, so raise it early when getting quotes.
Typically trained and vetted staff, supervision, equipment, supplies, absence cover, and full compliance documentation such as RAMS and COSHH, all under one agreed fee.
It depends on office size, frequency and scope. See our guide to how much office cleaning costs in London for current benchmarks.
Yes, and many businesses do exactly that as they grow. Just factor in the possible TUPE implications for any existing cleaning staff.
Make the simpler choice
If you would rather not carry the cost, management and compliance of an in-house team, outsourcing gives you a spotless office and one predictable fee.
As a London-based, Living Wage accredited provider, we supply trained, directly employed and vetted cleaners, full compliance documentation as standard, and guaranteed cover so your office is never left unclean. Whether you run one office or a portfolio across the capital, we make it simple.
Request a free quote today and we will show you exactly what outsourcing would cost for your office, with no obligation.
