Commercial Engineers Providing Expert Solutions

Welcome to SEM Facilities, your trusted partner for all your commercial gas and heating engineering needs. As a leading provider of comprehensive facility solutions, we are committed to delivering professionalism and excellence in every aspect of our services.

Fully Qualified & Trusted Commercial Gas Engineers

We take pride in our expertise in installing and maintaining a wide range of commercial gas central heating systems and boilers at SEM Facilities. Our dedicated team is well-versed in handling all makes and models, ensuring that we meet your specific needs with precision and proficiency.

Professional Commercial Heating Engineers

Our engineers are not just technicians at SEM Facilities, but experts who have undergone extensive training, setting the industry standard for commercial boiler installation and maintenance. With each GAS Safe registered, your commercial heating systems are in the most capable hands.


Years of experience and service excellence for our clients.


Counties covered with our professional services.


Clients worked with, building strong relationships.

Welcome To SEM Facilities And Our Service Excellence

As members of the Gas Safe Register and Safe Contractor Association, as well as numerous other safety and quality control-driven associations you can be assured that we offer all our clients the highest levels of professionalism. Enjoy service excellence from a company you can trust by speaking with our experts, today.

Professional and reliable

Choose SEM Facilities For Reliable, Trusted Solutions

Since 2002, we’ve been known for our professionalism and reliability. Our team is skilled in managing diverse projects, always exceeding customer expectations. Partner with SEM Facilities for enhanced safety, efficiency, and longevity of your systems. Our commitment to superior service, continuous learning, and embracing new technologies sets us apart.

We now use cloud-based software which enables us to instantly connect our on-site engineers with job notes, access instructions, site assets etc and they are able to report fault diagnosis back to our technical team.

Commercial Engineering Experts For Your Business

At SEM Facilities, our extensive experience in commercial gas and heating engineering allows us to work in a wide variety of commercial environments. Rest assured, your business needs will be met no matter your industry requirements by our expert team, providing engineering solutions that maintain your facilities.

Commercial Buildings & Facilities

We work in a variety of commercial facilities, such as factories, manufacturing plants and warehouses.

Schools, Colleges & Universities

Providing schools, colleges and university buildings much-needed installations, repairs and maintenance.

Office & Corporate Buildings

Working in a variety of office buildings, our engineers excel at conducting high quality repairs and maintenance.

Retail & Hospitality Buildings

Having worked in many retail and hospitality establishments, we follow strict timelines for any project.

Discover Our Industry Leading Services

Choose from our range of gas and heating services that will ensure your facilities are running as they should and maintained to the highest standards. Find out more about each service and contact us to discuss your needs for a quote today.

Trusted and Committed

Customer-Focused Service That Delivers Every Time

At SEM Facilities, our Commercial Gas and Heating engineers are committed to delivering top-tier, customer-centric service. Recognising the individual requirements and expectations of each client, we endeavour to provide bespoke solutions. Our engineers, upon arriving at the client’s site, initiate open dialogue to grasp the project’s breadth. They meticulously assess the unique gas and heating requirements considering factors like premise size, existing infrastructure, and energy efficiency targets. This allows us to deliver customised solutions that are in line with our clients’ business goals.

Our engineers, upon arriving at the client’s site, initiate open dialogue to grasp the project requirements. Prioritising customer satisfaction, we go above and beyond to meet their expectations and deliver enduring value. Through our customer-centric approach, SEM Facilities’ engineers aim to forge robust relationships built on trust, dependability, and unparalleled service. And remember, each project will have both dedicated account manager and staff, ensuring smooth operations throughout the whole project!

Unsure if we cover your area? Learn more about our coverage or contact us!

Recently Completed Projects

AT SEM Facilities, we understand portfolios have the power to provide peace of mind. Browse our range of recently completed projects and find examples of our excellent work, below!

1 June 2020

Islington Council for Woodside Contract Services

Read More
1 June 2020

University for the Creative Arts

Read More

Experienced Commercial Engineers

SEM Facilities are fully qualified commercial gas and commercial heating engineers, offering custom solutions to 12 counties in South East England.

+44 (0) 203 4750 999

19 Timber Lane Caterham Surrey CR3 6LZ

Client Testimonials

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


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


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 Ford


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


Our Latest News & Articles

Keep up-to-date with both industry news and insights, as well as the latest updates from SEM Facilities. From what’s happening behind the scenes, to further information on the most recent news and industry trends you need to know.

Commercial Gas Engineers Wycombe
Gas | 21 November 2023

Commercial Gas Engineers Wycombe

Our team of experienced commercial gas engineers in High Wycombe provides gas installation, repairs and maintenance services for all your business needs....

Commercial Gas Engineers Watford
Gas | 21 November 2023

Commercial Gas Engineers Watford

We offer comprehensive services including gas installation, repairs, and maintenance to meet all your business requirements. Inquire today. Reliable Gas...

Gas Engineers Oxford
Gas | 1 November 2023

Gas Engineers Oxford

Experienced commercial gas engineers in Oxford, offering gas installation, repairs, and maintenance services. Contact us now   Find a Gas Engineer in...

Gas Engineers Wimbledon 
Gas | 30 October 2023

Gas Engineers Wimbledon 

Expert commercial gas engineers in Wimbledon, providing gas installation, repairs and maintenance services. Contact us now   Wimbledon Gas Engineers  If...

Services for Schools
Customer Service | 24 August 2020

Services for Schools

Specialist engineering and maintenance support for schools and colleges We are fully qualified gas, heating, plumbing, electrical and air conditioning...

Kerry Jones joins SEM Facilities
Customer Service | 2 May 2020

Kerry Jones joins SEM Facilities

Kerry Jones launches our South West division We are delighted to welcome Kerry Jones to our ever growing business, enabling us to expand our services to the...

Customer Service | 2 May 2020


Tracking our engineers with new technology In order to keep a closer eye on the efficiency of our customer services SEM Facilities have now installed the...

Get Hydrogen Ready
Gas | 10 March 2020

Get Hydrogen Ready

Making the change to hydrogen heating In the UK we already have 100% natural gas grid, and as of 1996, under current regulations, all gas boilers installed...

Gas Safety is our business
Gas | 2 October 2019

Gas Safety is our business

Gas Safety Week… all year round! SEM: THE GAS SAFETY SUPERHEROES Gas Safety Week may have been and gone back in September but at SEM Facilities EVERY...

SEM Facilities – Frequently Asked Questions

Whether you are seeking information about our services, looking for expert advice, or have a general question, our FAQ guide will provide you with answers to common questions we receive. If for any reason you can’t find the necessary information here, please contact us where we’ll be happy to help you.

SEM Facilities stand out for our extensive experience, excellent reputation, and commitment to customer service. Our membership in the Safe Contractor Association and other industry accreditations further emphasise our dedication to maintaining high standards.

Our services consist of commercial gas engineering, commercial heating engineering and chimney inspection.

We utilise cloud-based software that allows instant connection with our on-site engineers. This software enables us to provide job notes, access instructions, and site assets to the engineers. Additionally, the engineers can report fault diagnosis back to our technical team using this system.

Simply fill out our online enquiry form at the bottom of this page and we’ll get back to you ASAP. Alternatively, please contact us by calling +44 (0) 203 4750 999, or by sending us an email to We look forward to your enquiry and arranging a service for when convenient for you.

We cover a large area of the UK, so be rest assured wherever you are located, we will be able to reach you with our expert services.  Please tell us where you are located in your enquiry, and we’ll be able to advise further. You’ll also find more information on our Areas We Cover page.