Expert Commercial Gas & Heating Engineers in the South East
Minimising downtime and ensuring total compliance for your facilities. From commercial boiler installations to smart remote monitoring, we provide reliable engineering solutions you can trust.
Expert Commercial
Gas & Heating Engineers
in the South East
Minimising downtime and ensuring total compliance for your facilities. From commercial boiler installations to smart remote monitoring, we provide reliable engineering solutions you can trust.
25+ Years of Industry Excellence
SEM Facilities - Taking the Stress Out of Facilities Management
Managing a commercial property means mitigating risk. At SEM Facilities, we partner with facility managers, property owners, and local authorities to ensure your heating, gas, and water systems are safe, compliant, and highly efficient.
We don’t just fix problems; we prevent them. With dedicated account managers and state-of-the-art cloud-based reporting, you get real-time job notes, instant fault diagnostics, and total transparency from the moment our engineers arrive on site.
- Rapid, Reliable Response: Minimising your operational downtime.
- Fully Vetted Experts: Highly trained, DBS-checked, and Gas Safe registered engineers.
- Bespoke Solutions: Tailored maintenance plans that align with your business needs.
Work With Us
Managing commercial facilities is complex enough – partnering with your engineering team shouldn’t be. We make quoting, compliance, and project execution completely frictionless. Here is our simple three-step process to securing your site:
Request an Assessment
Fill out our quick contact form or call our support line. Tell us about your facility’s current needs, whether it’s an emergency breakdown or an upcoming compliance check.
Transparent Strategy & Quotation
Our technical team will review your requirements (or conduct a site visit if necessary) and provide a clear, competitive, and fully transparent quote with no hidden fees.
Expert Execution & Reporting
Our Gas Safe engineers arrive on time, complete the work with minimal disruption to your operations, and instantly upload digital compliance certificates and job notes via our cloud-based portal.
Comprehensive Facility Maintenance & Engineering Services
Maintaining a commercial property requires a multi-disciplined approach. We provide a complete suite of gas, heating, and hygiene services designed to ensure your site remains safe, legally compliant, and operating at peak energy efficiency year-round. Explore our core capabilities below:
Commercial Gas & Heating
Complete installation, reactive repair, and planned preventative maintenance (PPM) for all makes and models of commercial boilers and heating systems.
Water Hygiene & Closed System Support
Protect your staff, tenants, and visitors with our end-to-end water treatment solutions. We ensure strict health and safety compliance for your water assets, preventing the build-up of harmful bacteria.
Smart Remote Monitoring
Proactive cloud-based diagnostics that track the health of your systems 24/7. We identify and resolve anomalies before they turn into costly breakdowns.
Chimney & Flue Inspections
State-of-the-art CCTV surveys and detailed condition reports to guarantee your commercial flues operate safely and efficiently.
Swimming Pool Boilers
Fully HWB1 accredited installation, servicing, and emergency repair for swimming pool boilers. We ensure safe, compliant, and consistently warm pool facilities.
Bespoke Maintenance Packages
Every commercial facility is unique. If you have specialised engineering requirements, our team can design a custom preventative maintenance and reactive repair contract tailored exactly to the demands of your site.
Trusted Across Commercial Environments
We understand the unique regulatory and operational demands of different sectors. Our engineers adapt to your environment, ensuring minimal disruption to your daily operations.
High-End Residential
Efficient and ambient living environments for landlords and residents.
Recent Projects
From historic 15th-century manor houses to large-scale university campuses, see how we deliver reliable, compliant solutions for complex commercial environments.
What Our Clients Say
I don’t think that you could improve much more, SEM have always responded quickly. Provide a great service, communication is second to none. If there is anything that is not with their capabilities, they tell me. All at a reasonable price.
John Holcroft | Mitie
SEM supported us on an emergency call out for leaking pipework on a roof. The fast acting of the team had the issue temporarily repaired, quotation accepted and remedial works completed to a high quality and efficiently. Would highly recommended to all!
James Tranham | AMD
All of us at Porters are very grateful for your prompt attention to our boiler room breakdown. We were almost at the point of evacuating the building until your guys turned up at the door as arranged. As it turned out (despite our panic) the problem was relatively minor and you charged accordingly. Your billing reflected the fact and your honesty is to be commended.
Jon Porter | Porter Industrial Controls
SEM Facilities have been on our approved suppliers list for many years, and have carried out all aspects of Gas related works on our mobile portfolio to a professional high standard.
We have always found SEM to be reliable, trustworthy and extremely obliging, they work to our company processes and are flexible to the working situations.
Gerry Connoly | Intergral UK Ltd
As an FM company we at IQPS strive to use high quality and efficient engineers. SEM Facilities have proved to be a call above the rest with their extensive knowledge of all systems irrelevant of size or age.
Their happy and confident approach to tacked anything we throw at them fills us and our clients with great confidence. Keep up the good work from all of us at IQPS.
Toby | IQ Property Services
I can confirm our company has employed SEM over many years covering aspects of Gas and heating on contracts ranging in scale from a few thousand pounds up to £250,000. We continue to retain their services as we have found that their standard of works and professionalism is second to none.
We would have no hesitation in recommending them if you have any Gas or heating projects where a very high standard of workmanship is required.
John Putnam | Opus Facilities Ltd
As contract manager for M and E across 4 University sites, I have struggled to find a reliable contractor to maintain the combustion plant. A colleague of mine recommended Surrey Environmental Maintenance to me 4 years ago and I haven’t had a need to go elsewhere. I have found them to be professional and technically capable. Quoting and administration is quick and proficient. Always happy to respond to urgent calls, giving time scales and great advice as required.
The most important thing is their honesty, if they cannot do something, they will tell you.
John Holcroft | Mitie
Frequently Asked Questions
Why should I choose SEM Facilities over other commercial gas engineers?
With over 25 years of experience and more than 20,000 completed projects, we offer unmatched reliability. We don’t just send an engineer; we provide a dedicated account manager and utilise cutting-edge, cloud-based software. This gives you real-time access to job notes, site assets, and instant fault diagnostics. Plus, our Gas Safe and SafeContractor accreditations guarantee the highest safety standards.
Do you offer Planned Preventative Maintenance (PPM) contracts?
Yes. We highly recommend proactive maintenance to prevent costly breakdowns and ensure your facility remains fully compliant with UK health and safety regulations. We tailor our PPM schedules to the specific demands of your building, whether it’s a school, retail space, or industrial plant.
How quickly can you respond to a commercial heating or gas emergency?
We understand that equipment failure costs your business money. Because our engineers are connected instantly via our cloud-based dispatch system, we can rapidly deploy the nearest qualified professional to your site to stabilise the situation and begin remedial works.
Are your engineers fully qualified and vetted?
Absolutely. Every engineer at SEM Facilities is highly trained, Gas Safe registered, and fully DBS-checked. When our team steps onto your premises, you can have complete confidence in their expertise and professionalism.
Which areas do you cover with your commercial services?
We cover 12 counties across the South East of England. Our core service areas include London, Surrey, Sussex, Essex, and Berkshire. Because our dispatch system is cloud-based, we can efficiently route our engineers to commercial sites across the entire South East region. If you are unsure whether your facility falls within our radius, please contact our support team or check our Areas We Cover page.
Commercial Engineering Coverage Across the South East.
We provide rapid, reliable coverage across 12 counties in the South East of England. Whether you require planned maintenance or emergency reactive support, our Gas Safe registered team is ready to deploy.
- Surrey
- London
- Kent
- Hertfordshire
- Essex
- Buckinghamshire
- Oxfordshire
- West Sussex
- East Sussex
- Berkshire
- Bedfordshire
- Hampshire
Choose SEM Facilities For...
Gas Safe Registered Commercial Gas Engineers
Installation & maintenance of commercial gas central heating systems
Expert diagnostics & servicing of all makes and models
Dedicated account managers & emergency call-outs
Gas safety inspections & certificates
Certificates, reports and project photos all instantly available via our cloud software
Improved boiler efficiency
Excellent value and customer satisfaction
