Commercial vs Domestic — The Key Differences

Domestic pressure washing — driveways, patios, fencing — is typically quoted on the day, carried out within a few hours, and invoiced directly to a homeowner. Commercial pressure washing operates differently in almost every respect. Sites are larger, access is more complex, clients expect written specifications and method statements, and the compliance requirements around water management, health and safety, and insurance are significantly more demanding.

This does not mean commercial work is out of reach for a new operator. It means it requires preparation. An operator who turns up to a commercial site without understanding what is expected will struggle — not because the cleaning itself is technically harder, but because the professional and administrative framework around it is more rigorous.

Common Commercial and Industrial Site Types

The Site Survey — What to Do Before You Quote

Never quote a commercial job without visiting the site first. A site survey is not optional on commercial work — it is how you establish the scope, identify the risks, and produce a price that reflects the actual job rather than an assumption about it.

What to assess on a site survey

• Total area — measure or estimate the surface area to be cleaned. Commercial sites are often significantly larger than they appear from the entrance.
• Surface types — identify what you are cleaning. Concrete, tarmac, block paving, resin, and painted surfaces all have different requirements.
• Contamination type and load — is it general grime, biological growth, oil and fuel, or a combination? Heavy contamination requires chemical pre-treatment and longer dwell time, which affects your time on site and your pricing.
• Water supply — is there a mains connection available on site? What flow rate? Is a bowser required? Water supply is the most commonly underestimated constraint on commercial sites.
• Drainage — where do surface water drains go? Are they connected to surface water or foul water? Are trade effluent consents in place? This is a legal compliance issue, not just a practical one.
• Access and logistics — when can you access the site? Are there vehicle movements to work around? Where can you park your vehicle and equipment?
• PPE and site rules — does the site have its own PPE requirements? Do you need to sign in? Is a site induction required?

Reading a Cleaning Specification

Larger commercial clients — facilities management companies, national retailers, local authorities — will often provide a written cleaning specification rather than simply asking you to clean the site. A specification sets out exactly what is required, to what standard, how frequently, and under what conditions. You are expected to deliver to that specification, not to your own interpretation of what clean looks like.

Key elements to look for in a commercial cleaning specification include the defined scope of works (exactly which areas are included and excluded), the performance standard expected, the frequency of service, any chemical restrictions or approvals required, health and safety obligations, documentation and sign-off requirements, and the process for reporting defects or issues discovered during the clean.

Equipment Requirements for Commercial Work

Commercial and industrial sites routinely require equipment that goes beyond a standard domestic setup. Understanding what the job requires before you quote is essential — equipment hire or subcontracting costs must be built into your price.

Hot water pressure washers

Hot water machines are significantly more effective than cold water on oil, grease, and heavy organic contamination — the heat breaks down hydrocarbon bonds far more effectively than cold water and chemical pre-treatment alone. Many commercial clients, particularly in food production, logistics, and automotive, will expect hot water capability. If you only have a cold water machine, factor this into which contracts you pursue.

High-flow machines and bowsers

Large yard areas require high-flow machines — both for cleaning speed and for maintaining adequate pressure over long hose runs. On sites without adequate mains supply, a water bowser is essential. A bowser also provides independence from the client's water supply, which avoids disputes about water usage costs.

Surface cleaners

A rotary surface cleaner is essential for large flat area cleaning on commercial sites. Cleaning a 500 square metre yard with a lance alone is slow, physically exhausting, and produces an uneven result. A surface cleaner attached to a high-flow machine will clean the same area faster, more evenly, and with significantly less operator fatigue.

Health and Safety on Commercial Sites

Commercial and industrial sites have their own health and safety management systems, and as a contractor working on site you are required to operate within them. This means more than just wearing your own PPE.

• Method statement — a written document explaining how you will carry out the work safely. Many commercial clients require this before allowing you on site. It covers the sequence of work, chemicals used, PPE worn, hazards identified, and control measures in place.
• Risk assessment — a written assessment of the hazards associated with the work and how you will control them. Required under health and safety law for all work activities and expected by commercial clients as a matter of course.
• Site induction — many commercial sites require contractors to complete a site induction before starting work. This covers site-specific hazards, emergency procedures, and site rules. Allow time for this in your scheduling.
• Permit to work — some activities on some sites require a formal permit to work — for example, working near live electrical equipment, working in confined spaces, or working where vehicle movements create a specific risk. If a permit is required, you cannot start work without it.

Insurance Requirements for Commercial Work

Public liability insurance at the £1 million level that may be sufficient for domestic work is often not enough for commercial contracts. Many commercial clients and facilities management companies require contractors to hold a minimum of £5 million public liability cover, and some require £10 million. Check your policy limits before quoting for commercial work and upgrade if necessary — the premium difference is small relative to the contract value.

Employers liability insurance is legally required as soon as you employ anyone, including labour-only subcontractors in some circumstances. If you bring in additional operatives for larger commercial jobs, check your policy covers them before they set foot on site.

Presenting Professionally to Commercial Clients

Commercial clients — facilities managers, property managers, procurement officers — make decisions based on confidence that you will deliver reliably, consistently, and without creating problems for them. The quality of your cleaning matters, but so does how you present yourself and your business before the work even begins.

• Arrive at the site survey on time and in company uniform or workwear — first impressions count with commercial clients more than with domestic ones.
• Provide a written quotation, not a verbal price. Include the scope of works, the price, payment terms, insurance details, and your company information.
• Have your method statement and risk assessment ready to provide on request — do not wait to be asked a second time.
• Follow up after the survey if you have not heard back within the agreed timeframe. Commercial procurement cycles are often slow — a polite follow-up is expected, not pushy.
• After completing the work, provide a job completion report — a brief written confirmation of what was done, with before and after photographs. This gives the client something to file and makes your invoice easier to approve.