PROTECTING WATER.PROTECTING LIVES.

Commercial water safety and plumbing services delivered by qualified specialists trusted by NHS trusts, care homes, and commercial estates across London and South East England.

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HTM 04-01 CompliantBS 8558COSHHHSG274BS EN 806TMV & TMT InstallersTMV Maintenance SpecialistsHTM 04 D0824/7 Emergency ResponseCommercial SpecialistsSouth West LondonNHS TrustedWater Safety ExpertsHTM 04-01 CompliantBS 8558COSHHHSG274BS EN 806TMV & TMT InstallersTMV Maintenance SpecialistsHTM 04 D0824/7 Emergency ResponseCommercial SpecialistsSouth West LondonNHS TrustedWater Safety Experts
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TMVs Serviced & Installed

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Years Industry Experience

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Emergency Response

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Commercial Focus

What We Do

End-to-end water safety and plumbing for commercial estates.

Our specialism. Done properly.

TMV & TMT Servicing

Thermostatic Mixing Valves and Thermostatic Mixing Taps are critical safety devices. When they fail, people get hurt. We've installed and serviced over 1,000 across NHS trusts and commercial sites, to HTM 04-01 standard every time.

Annual servicing & fail-safe testing
New TMV/TMT installations
Replacement programmes
Full compliance documentation

Clean systems. Documented evidence.

System Disinfections

Full system disinfections to ACoP L8, HSG 274 part 2, BS 8558 and CIBSE guidance. That includes new installation sign-off, post-remediation work, and planned disinfections as part of your water safety programme. Every disinfection comes with a full written report.

Pre-occupancy disinfections
Post-remedial disinfections
Planned programme disinfections
Written reports & compliance records

Fix the root cause, not just the symptoms.

Dead Leg Removal & Remedial Works

Dead legs, redundant pipework and poorly designed systems are the leading cause of Legionella risk in commercial buildings. We identify, isolate and remove them and hand over documentation your Responsible Person can rely on.

Dead leg identification & removal
Redundant pipework isolation
Remedial works from risk assessment actions
As-built documentation

Built right from day one.

New Pipework & System Installs

From new domestic services to full commercial water system installations, we design and install to current standards, including HTM 04-01, BS EN 806, and Water Supply Regulations.

Cold water storage & distribution
Hot water systems & calorifiers
New TMV/TMT installations
Pipework modifications & extensions

The full building services picture.

Heating & Drainage

Water safety doesn't exist in isolation. We also cover commercial heating systems and drainage so estates teams have a single specialist contractor for the full building services picture.

Commercial heating systems
Boiler and plant maintenance
Drainage installations & clearances
Pump maintenance & replacement

Know your system. Manage it properly.

Asset Surveys & Drawings

You can't effectively manage water safety on a system you don't fully understand. Accurate asset registers and up-to-date schematic drawings are the foundation of any credible Water Safety Plan. Without them, your Responsible Person is working blind and your risk assessment is built on assumptions.

Full water system asset surveys
Schematic and as-fitted drawings
Asset register production and updates
Gap analysis against existing documentation
OUR EDGE

The Hydren Difference

Hydren is led by water safety professionals with deep experience managing complex systems across NHS and commercial estates. Our work is grounded in qualified Responsible Person (Water) leadership, which carries the formal accountability for water safety compliance under HTM 04-01 and HSG274.

That means we approach every job with the mindset of those who will ultimately answer for the outcome, not simply whoever completed the task.

  • Qualified Responsible Person (Water) leadership
  • HTM 04-01 working knowledge
  • Documentation that satisfies auditors and CQC inspections
  • NHS-trust level standards applied to every project
OUR CLIENTS

Who we partner with

Hydren supports hospitals, care providers, hospitality, offices, education, and public-sector estates across London and the South East. We are set up for ongoing commercial programmes built around the kind of work estates teams, facilities managers, and responsible persons need from a specialist they can call on again and again.

  • NHS Trusts & healthcare facilities
  • Private hospitals & care homes
  • Hotels & hospitality
  • Commercial offices & retail estates
  • Educational establishments
  • Local authorities

Work We're Proud Of

Every project is different. Here are three that show how we think when things aren't straightforward.

NHS Healthcare Facility, London

Dead Leg RemovalSystem DisinfectionLive Clinical Environment

THE CHALLENGE

A large NHS site had over 20 identified dead legs across both hot and cold water systems. That represented a direct Legionella risk. The system was fully live, serving clinical areas that couldn't be taken offline. Existing isolation valves were unreliable.

WHAT WE DID

We coordinated closely with the clinical team to plan each phase around patient safety, working entirely out of hours and predominantly at night. Where reliable isolation didn't exist, we froze the pipework and installed new isolation valves before proceeding. All 20+ dead legs were removed compliantly and the full system was chemically disinfected on completion.

THE OUTCOME

Every identified dead leg resolved. System disinfection completed and signed off. Full compliance documentation provided. Zero snagging items.

Commercial Healthcare Facility, South East England

TMV ReplacementRestricted AccessHTM 04-01

THE CHALLENGE

A client needed a number of TMVs replaced across their site. The valves had been installed in positions that made them almost inaccessible. Other contractors had suggested opening up walls and ceilings.

WHAT WE DID

Rather than defaulting to demolition, we assessed each location before raising a tool. We found a way to access and replace every single TMV without removing a single panel, tile, or section of wall, then repositioned each valve to a more accessible location for future servicing.

THE OUTCOME

Every TMV on the programme replaced and commissioned to HTM 04-01 standard. Zero making-good required.

Commercial Office Building, London

Hot Water BalancingCommissioningTemperature Compliance

THE CHALLENGE

A building manager called us in with a persistent problem: hot water circulation wasn't working. Outlets on upper floors, including the 7th, were failing to reach correct temperatures, creating both a Legionella risk and a compliance failure.

WHAT WE DID

We identified the root cause: return legs lacked proper balancing. Working alongside the client, we installed double regulating balancing valves on each return leg throughout the building. Each valve was individually tested and commissioned based on measured flow data rather than estimates.

THE OUTCOME

Full hot water circulation achieved throughout the building including 7th floor furthest outlets. Temperatures brought into HTM 04-01 compliance at all sentinel points. Full commissioning data provided for the water safety logbook.

HOW WE WORK

A Clear Process. No Surprises.

From first contact to signed-off job, you know exactly what to expect at every stage.

Initial Consultation

A quick call or site visit to understand the scope of works, your compliance requirements, and any existing water safety documentation. No obligation, no sales pitch.

Scoped Proposal

A clear, itemised quote with scope of works, timescales, and what documentation you will receive on completion. No hidden extras, no vague line items.

Planned Delivery

Works are scheduled around your estate's operational needs while minimising disruption to staff, patients, or building occupants. Out-of-hours available where required.

Documented Sign-Off

Every job comes with the right paperwork, including completion records, test results, certificates, and as-built information your Responsible Person or auditor needs.

STANDARDS & COMPLIANCE

We Work to the Right Standards.

Every job is carried out in accordance with current NHS guidance, British Standards and HSE regulations. Precisely, not approximately.

ACoP L8

Legionnaires' Disease: Control of Legionella

HSE Approved Code of Practice and guidance on controlling Legionella in water systems. Our risk assessments, monitoring and remedial works align with ACoP L8 expectations.

HTM 04-01

Safe Water in Healthcare Premises

The NHS England standard governing water safety in healthcare. All our healthcare works are delivered to HTM 04-01 requirements.

BS 8558

Guide to the Design of Water Systems

The British Standard for design, installation, testing and maintenance of water supply services. Our disinfections follow BS 8558 procedure.

BS EN 806

Specifications for Installations Inside Buildings

European standard for drinking water installations. Applied to all new pipework installations we carry out.

HSG274

Legionnaires' Disease (HSE Guidance)

HSE's technical guidance on Legionella control. Our water safety works are carried out in accordance with Parts 1, 2 and 3 of HSG274.

WSR 1999

Water Supply (Water Fittings) Regulations

Legal requirements for the installation, use and maintenance of water fittings. All plumbing installations comply with the 1999 Regulations.

CIBSE

Chartered Institution of Building Services Engineers

CIBSE guidance applied to water treatment and system design, including TM13 for building services engineering.

SFG20

Maintenance Schedules for Building Services

Industry-standard maintenance schedules and frequencies for building services assets. We align planned maintenance and records with SFG20 where estates teams use it.

COSHH

Control of Substances Hazardous to Health

Assessments and safe systems of work for chemicals used in disinfections, dosing and water treatment. We work so site activities meet COSHH expectations alongside water safety law.

ABOUT HYDREN

Built on Expertise. Not Just Experience.

Hydren Group is a commercial water safety and plumbing specialist based in South West London. We work exclusively with commercial clients, including NHS trusts, healthcare facilities, care homes, hotels, and commercial estates across London and South East England.

Hydren was built by seasoned water safety professionals with years of hands-on experience managing complex systems for NHS trusts and commercial estates. Our delivery is grounded in qualified Responsible Person (Water) leadership: the formal accountability for water safety compliance under HTM 04-01 and HSG274.

We approach every job with the mindset of those who will ultimately be held responsible for the outcome, rather than someone who only needs the visit signed off. That means proportionate controls, evidence-led documentation, and work that sits credibly inside your Water Safety Plan.

We don't take on domestic work. We don't cut corners on documentation. And we don't take on jobs we're not qualified to deliver.

Qualified Responsible Person (Water) leadership

Formal accountability under HTM 04-01 & HSG274

HTM 04-01 working knowledge

Applied on live estates, not theory alone

Documentation that satisfies auditors and CQC inspections

Evidence-led records and handover packs

NHS-trust level standards applied to every project

Same rigour for healthcare, care, and commercial clients

Most contractors can do the work. Very few understand what the work means from a compliance perspective. That gap is what we exist to close.Hydren Group

GET IN TOUCH

Let's Talk About Your Site.

Commercial enquiries only. We'll respond within one business day, and often faster.

Call Us

0800 XXX XXXX

Emergency Response

Available 24/7 for urgent works

24/7 Available

Coverage

London & South East England

Commercial clients only. No domestic work.