DMG Delta | Award-Winning Building Services Maintenance Contractor

About Us

Your Award-winning Maintenance Partner for Building Services

For over 30 years, DMG Delta has been maintaining and protecting critical building systems across residential and commercial properties in London and the South East.

We specialise in heating, air conditioning, and plant maintenance, helping our clients save money, reduce downtime, improve efficiency and extend the lifespan of their assets.

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Who We Are & Where We Work

We deliver planned and reactive maintenance for property managers, developers and commercial clients across London and the South East.

Our mobile engineering teams work around the clock to keep systems performing at their best – from residential developments to office complexes, retail and mixed-use sites.

We look after over 250 sites, maintaining everything from complex energy centres on heat networks to large commercial boilers – helping our clients improve efficiency, reduce carbon emissions and lead the way towards a Net Zero future.

Our Story

Since 1991, DMG Delta has built a reputation for reliability and technical excellence. What began as a heating maintenance company has grown into a trusted engineering partner providing full building services maintenance, compliance, and emergency support.

Our work is guided by a simple promise: to keep your critical assets running safely and efficiently, every day of the year.

Our journey has been shaped by:

Growth and resilience over 30+ years
Trusted partnerships with 60 property managers
Looking after over 250 contracted sites
The expertise of our people, whose skills and dedication drive the quality of our service

Over three decades, our reputation for reliability and innovation has been recognised with multiple industry awards for service excellence.

Why Choose Us

We keep key building assets maintained and performing at their best – delivering long-term reliability, improved efficiency and real energy savings.

24/7/365 Emergency Cover

Our engineers respond within two hours across central London, protecting clients from catastrophic system failures.

Mobile Engineering Team

Fully equipped, highly trained and ready to restore services at any time.

Experts in Disaster Recovery and Critical System Maintenance

Minimising downtime, preventing costly interruptions and recovering from catastrophic failure.

CIBSE-Qualified Engineers

Working to the CIBSE CP1 Code of Practice for Heat Networks and industry standards.

Rigorous Vetting and DBS Checks

Every member of our team undergoes rigorous vetting and DBS checks.

Client Portal

Providing transparency, service reports and live updates in one place.

Gas Safe, NICEIC, ECA and BESA Accredited

Demonstrating compliance and quality at every level.

Data Security You Can Trust

We’re Cyber Essentials Plus certified, protecting client systems and sensitive data to the highest standards.

View our Case Studies

Awards & Accreditations

We’re proud to be independently recognised for our standards – here are just some of our accreditations:

ISO 9001 – Quality Management
ISO 14001 – Environmental Management
ISO 45001 – Occupational Health & Safety
Silver Investors in People
Cyber Essentials Plus Certified
TPI Partner
BESA, Gas Safe, NICEIC and ECA members

Award-winning maintenance contractor

Here’s a snapshot of our recognition over the last five years.

NOTB Property Management Awards

Winner – Property Maintenance Company of the Year (2024)

Highly Commended – Contractor of the Year (2024)

ARMA ACE Awards

Winner – Partner of the Year (2022)

Highly Commended – Partner of the Year (2023)

H&V News Awards

Finalist – District Heating Project of the Year (2020)

Finalist – Lockdown Energy Champion of the Year (2021)

Why our recognition matters

Our awards and accreditations reflect more than technical ability – they show our dedication to quality, reliability and progress.

We’re trusted to maintain critical building systems 24/7/365, support clients through emergency response and sustainable system upgrades, and help lead the transition towards a Net Zero future.

By combining engineering excellence with responsive service, we deliver long-term results that keep our clients’ buildings – and their residents – running safely, efficiently and sustainably.

As regulations evolve, we’re focused on helping our clients stay one step ahead.

Staying Ahead of Compliance

Keeping up with new building and heat network regulations can feel like a lot – especially with the Building Safety Act, the Energy Act and Heat Network Technical Assurance Scheme (HNTAS) coming into force.

We’re here to make it easier.

We keep an eye on what’s changing, explain what it means in plain English, and make sure the systems we maintain meet the latest safety and compliance standards. That way, our clients have everything they need to stay on top of their legal responsibilities with confidence.

COMING SOON

The Compliance Companion Playbook

Clarity. Confidence. Compliance – made simple for Property Managers.

Regulations are evolving fast. The Compliance Companion Playbook will give you a clear, practical overview of what’s changing, why it matters, and how to prepare.

Be the first to access the Playbook when it launches and get straightforward advice to keep your buildings safe, compliant and future-ready.

Our Vision & Values

Why we exist

We believe real progress happens when expertise meets vision. That’s why we bring together the right people, data and ideas to create opportunities – for our clients, our teams and the residents we support.

Our purpose is clear:

We bring together people, data and expertise to deliver reliable, transparent energy solutions that make a difference.

DMG Delta engineer arriving on site within one hour in London to restore heating and building services systems.

How we work

Our values guide everything we do. They define how we show up for our clients, our colleagues and our partners – every day. They remind us that how we do business matters just as much as what we do.

We take responsibility.

We own our impact and follow through every time.

We put people first.

We learn, adapt and push to be better every day.

We’re always improving.

We learn, adapt and push to be better every day.

We succeed together.

We build relationships that last – across teams, companies and communities.

What this means for our clients

Our values aren’t just words on a page – they shape how we work with every client, every day. They keep us focused on what matters most: delivering safe, efficient and sustainable solutions, built on trust and long-term partnership.

Our People

Our CIBSE-qualified engineers, project managers and support teams are the heartbeat of our business.

Every member of our team is trained, accredited and security-checked, ensuring the highest standards on every site.

We invest in ongoing CPD training and certification, and we also offer training courses for property managers, sharing our expertise to raise standards across the industry.