Fire Alarm Engineer - Isleworth, Greater London

Fire Alarm Engineer - Isleworth, Greater London, TW7 7LWContract: PermanentSalary: Offering up to £55,000 per annum including car allowance depending on experience and skills Are you ready to take your fire alarm expertise to the next level?
We are currently recruiting for two Fire Alarm Engineers who will play a key role in safeguarding Thames Water’s critical infrastructure. This is your chance to step into a diverse, hands‑on role where no two days are the same—travelling across sites, solving technical challenges, elevating safety standards, and shaping the future of fire alarm installations. With dedicated in‑house training and a clear pathway into a Project Engineer position, this is more than a job—it’s a real opportunity to grow, lead, and make a visible impact.

What you will be doing as a Fire Alarm Engineer
This role will lead to carrying out fire alarm risk assessments/requirements (HSP 12) upon request across many of Thames Water's sites.

In-house training will be provided to support the engineer to progress further towards a Project Engineer role, undertaking all aspects of Health & Safety management for your portfolio of projects. See below for full job requirements and expectations.

• Site visits to assess the quality of contractors' work against all standards.
• Compiling and reporting these findings, including photos.
• To advise and scope works with a contractor on resolving problems.
• Carry out site fire alarm assessments/requirements to BS 5839-1.
• Scoping/writing specification documents.
• Health & Safety management for your portfolio of projects.
• Assessing tenders.
• Financial management.
• Programme management.
• Communication and technical assistance to key stakeholders/customers.
• Ensuring all asset data is captured and updated at the end of a project.
• We are looking for a Project Engineer located in the West London/Thames Valley area, covering Thames Water sites.
• Required to travel to various sites each week. Please note that currently, some journeys could amount to an approximate 150-mile round trip.

Location –
The role is office or site‑based for up to five days each week. We are seeking candidates located near our Mogden, Guildford, or Swindon sites, as the position supports South West London and nearby regions.


You’ll also travel to other Thames Water sites as needed, depending on project demands. As this is a mobile role, you’ll need a full UK driving licence and your own vehicle.


A monthly car allowance is provided to support your travel.
Working Hours – Monday to Friday, 36 hours per week.

What you should bring to the role
To thrive in this role, the essential criteria you’ll need are:

• Have experience within a commercial and/or technical role.
• FIA BS 5839-1 Fundamental or equivalent certification in Fire Alarm principles and standards.
• Training or relevant work experience.
• Hold a full UK driving licence and have your own transport.
• Can work unsupervised and use your own initiative to deliver specified outputs.

What’s in it for you?

• Offering up to £55,000 per annum, including car allowance, depending on experience and skills.
• Car Allowance £4,500 car allowance
• 26 days holiday per year, increasing to 30 with the length of service. (plus bank holidays)
• Contributory pension – Defined Contribution - Maximum of 12% -2x employee contribution.
• Personal Medical Assessments – open to all once a year.
• Wider benefits scheme, including our benefits hub, which is packed full of offers and information to save you money and support your well-being.
• Performance-related pay plan directly linked to company performance measures and targets.

Find out more about our benefits and perks (Please note different T&Cs apply if on secondment)

Who are we?
We’re the UK’s largest water and wastewater company, with more than 16 million customers relying on us every day to supply water for their taps and toilets. We want to build a better future for all, helping our customers, communities, people, and the planet to thrive. It’s a big job, and we’ve got a long way to go, so we need help from passionate and skilled people, committed to making a difference and getting us to where we want to be in the years and decades to come.

Learn more about our purpose and values

Working at Thames Wate r
Thames Water is a unique, rewarding, and diverse place to work, where every day you can make a difference, yet no day is the same. As part of our family, you’ll enjoy meaningful career opportunities, flexible working arrangements and excellent benefits.

If you’re looking for a sustainable and successful career where you can make a daily difference to millions of people’s lives while helping to protect the world of water for future generations, we’ll be here to support you every step of the way. Together, we can build a better future for our customers, our region, and our planet.

Real purpose, real support, real opportunities. Come and join the Thames Water family. Why choose us? Learn more.

We’re committed to being a great, diverse, and inclusive place to work. We welcome applications from everyone and want to ensure you feel supported throughout the recruitment process. If you need any adjustments, whether that’s extra time, accessible formats, or anything else, just let us know. We’re here to help and support.

When a crisis happens, we all rally around to support our customers. As part of Team Thames, you’ll have the opportunity to sign up to support our customers on the frontline as an ambassador. Full training will be given for what is undoubtedly an incredibly rewarding experience. It’s also a great opportunity to learn more about our business and meet colleagues.

Disclaimer: Due to the high volume of applications we receive, we may close the advert earlier than the advertised date, so we encourage you to apply as soon as possible to avoid disappointment.