Comfort Services Group supports businesses across Greater London with practical, compliant water treatment services for commercial buildings.
From the City and Canary Wharf to Westminster, the West End, and the surrounding boroughs, our engineers help property teams keep water systems safe, efficient, and properly maintained.
Request a Free London QuoteOur Commercial Water Treatment Solutions in London
Every building has its own risks. Older London properties may have ageing pipework, extended dead legs, or plant rooms that have been altered over several decades.
Newer commercial developments often need careful commissioning, flushing, chlorination, and ongoing monitoring before occupation.
Our role is simple: help you understand the condition of your systems, reduce risk, and keep your building operating safely.
Legionella Risk Assessments & ACoP L8 Compliance
Landlords, employers, and duty holders in London have a legal responsibility to assess and control the risk of Legionella in water systems.
Comfort Services Group provides ACoP L8 compliance London organisations can use to support their legal duties and internal safety procedures.
Our engineers inspect the system, review likely risk points, and provide clear recommendations. This may include temperature monitoring, schematic reviews, written control schemes, remedial actions, and updated logbooks.
We regularly support:
Landlords
Managing agents
Offices and mixed-use buildings
Hotels, gyms, and leisure facilities
Healthcare, education, and public sector premises
The aim is not just to produce a report, but to give you a workable plan for keeping people safe.
Water Sampling, Laboratory Analysis & Testing
Our Legionella testing London service gives building managers clear evidence of water quality and bacterial risk.
Samples are collected by trained engineers and sent for UKAS-accredited laboratory testing. Depending on the system, this may include testing for Legionella, Pseudomonas, and key water chemistry indicators.
Results are explained in plain English, with practical next steps where action is needed. That might mean further monitoring, cleaning, disinfection, flushing, or chemical treatment.
Water sampling is commonly used for:
Routine compliance checks
Cooling tower monitoring
Domestic hot and cold water systems
Post-remedial verification
Healthcare and higher-risk sites
Buildings returning to use after stagnation
Accurate testing helps you make informed decisions before small issues become costly problems.
Closed Loop System Flushing & Chemical Water Treatment
Closed heating and chilled water systems can collect sludge, debris, corrosion products, and biofilm over time.
Our closed loop water treatment service helps clean, stabilise, and protect these systems so they perform more efficiently. This is especially important in London buildings where old pipework is often connected to newer plant and controls.
Flushing removes unwanted deposits from the system. Chemical cleaning and inhibitor dosing then help reduce corrosion, improve circulation, and protect boilers, pumps, valves, and heat exchangers.
The benefits can include:
Better heat transfer
Lower energy use
Fewer blockages and circulation problems
Reduced corrosion risk
Longer plant life
More reliable heating and cooling performance
For busy commercial premises, this can make a noticeable difference to running costs and maintenance planning.
Mains Water Chlorination & Disinfection
Mains water chlorination and disinfection are often needed when a water system is new, altered, refurbished, or has been left unused.
Comfort Services Group carries out chlorination and disinfection in line with BS 8558 requirements, helping ensure systems are clean, safe, and ready for use.
This service is commonly required for:
New commercial buildings
Refurbished premises
Modified pipework
Tank replacements
Systems affected by stagnation
Pre-occupation checks
Our engineers complete the work safely and provide clear documentation for your records.
For contractors, landlords, and facilities teams, this gives a straightforward route to compliance before a system is handed over or brought back into service.
Combating London’s Hard Water Challenges
Water treatment in London needs a local approach because the water supply is typically very hard.
Much of the city’s water comes from chalk catchments and underground aquifers. As a result, it contains high levels of calcium and magnesium ions.
When hard water is heated, these minerals can form limescale inside boilers, calorifiers, cooling towers, heat exchangers, and pipework. Even a small amount of scale can reduce heat transfer, meaning plant has to work harder to do the same job.
For commercial buildings, that can mean higher energy bills, reduced efficiency, more breakdowns, and earlier equipment failure.
Comfort Services Group helps London businesses manage these issues through water softening, scale control, chemical conditioning, monitoring, and planned maintenance. The goal is to protect your systems, reduce wasted energy, and keep essential services running properly.
What Our Customers Say
“The team at Comfort Services Group were awesome when they carried out the Legionella Control works at our offices, they were very accommodating, Tom and the guys on site were a pleasure to work with. I would recommend the services of Comfort Services Group without reservation. Excellent First impressions with the Office Team, which was mirrored by the guys who did the work. Thanks guys.”
Michael Green
“I have had Comfort commissioning working on different projects for the companies i have worked for over the past 15 years. They have assisted in many difficult projects throughout the country. Andy and Lawrence have been very professional and helpful. i found their attitude, and pro-active approach to be of very high standard. i will always push to use them on future projects”
Chris Richards
“Comfort commissioning are a great company, they deliver great services and the team there are very helpful and efficient. They really do care about their customers and take a keen interest in ensuring a high level of customer service is maintained at all times.”
Gary Clatworthy
“Fantastic service from Comfort from start to finish. Very responsive, friendly, reliable and professional.”
Sarah
“Contacted Comfort Commissioning Services Ltd for advice about unusual deposits in the header tank of an open vented domestic heating system. Not core business for them, but one of their directors responded to me really quickly via email with some excellent free advice which was greatly appreciated. Very impressed.”
Pete Davies
Why Choose Comfort Services Group for Your London Premises?
Comfort Services Group is not a general plumbing contractor.
We provide specialist commissioning and water treatment engineering for commercial buildings.
Qualified engineers across London
Our team works across all London postcodes, supporting businesses in the City, Canary Wharf, Westminster, the West End, and North, South, East, and West London.
Clear digital reporting
You receive comprehensive reports that are easy to store, share, and present during audits or compliance reviews.
Strong technical standards
Our work is carried out with reference to BSRIA guidelines, HSE guidance, British Standards, and accepted industry best practice.
Fast support when deadlines are tight
We can assist with urgent water quality issues, failed results, system stagnation, or upcoming compliance deadlines.
Specialist water treatment knowledge
Our engineers understand flushing, disinfection, dosing, commissioning, sampling, and system performance.
Experience with London buildings
We are used to working in everything from older commercial premises to modern multi-storey developments with complex plant rooms.
When comparing water treatment companies in London, it is important to choose a team that understands compliance as well as engineering.
Ready to Secure Your Building’s Water Quality?
Poor water quality can lead to fines, health risks, plant failure, and avoidable disruption.
Comfort Services Group can help you take control with testing, treatment, reporting, and practical compliance support.
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Frequently Asked Questions
What are the legal requirements for commercial water treatment in the UK?
Commercial water systems need to be risk assessed and managed to prevent Legionella exposure – and that’s not just a suggestion, it’s a requirement under HSE ACoP L8 and HSG274 guidance. This regulation applies to everyone involved in a building’s water system, including businesses, landlords, and anyone in charge of a water system.
You need to have a risk assessment, a written control plan, some records of monitoring, and a log book to keep track of what’s going on. You might also need to do some sampling from time to time. And good records are very important because they show that you’re actually taking the risks seriously.
How does London’s water hardness affect commercial HVAC systems?
London’s water is very hard, which means it’s got lots of calcium and magnesium in it. And when you heat hard water the calcium can form a scale inside boilers, calorifiers, heat exchangers and pipework. Even a tiny bit of scale can make your energy consumption go up by up to 7%, so it’s a problem you don’t want to ignore. Regular water treatment can help prevent scale, save you money, and make sure your plant runs smoothly.
How often should commercial water sampling be conducted in London?
Commercial water sampling is a regular thing and the frequency really depends on the type of system you’ve got and how much risk they thought you were running in the risk assessment. Cooling towers usually need quarterly testing but domestic hot and cold water systems might be okay with annual sampling, unless you’ve got a high-risk building in which case you might need to test more often. As always, the best way to get a feel for what you need is to get a site specific assessment done.
What is BSRIA BG29/2021 and does my London building need it?
BSRIA BG29/2021 is a useful guideline for getting your pipework systems in order before you turn them on. It’s mainly used for new and refurbished installations, especially closed heating and chilled water systems in commercial buildings. These guidelines help you get your pipework properly flushed and cleaned so that you don’t have any problems with corrosion, poor water quality and blocked strainers.
Do you service all areas of Greater London?
Yes, Comfort Services Group services commercial buildings across Greater London. Our engineers cover the City of London, Canary Wharf, Westminster, the West End, and commercial areas throughout North, South, East, and West London. We also support surrounding boroughs, helping landlords, managing agents, contractors, and facilities teams access reliable water treatment, testing, chlorination, disinfection, and compliance support.
