Heating & Building Services Maintenance for Residential and Commercial Buildings
24/7 support for plant rooms, communal heating, commercial heating systems and heat networks across London and the South East.
- Fast response and reliable award-winning engineering
- Reduced downtime and disruption for tenants and residents
- Fully accredited and compliant (CIBSE, Gas Safe, NICEIC)
Reactive and Planned Maintenance
We look after over 250 sites in London & the South East, maintaining and repairing everything from complex energy centres on heat networks to large commercial boilers.
Planned Maintenance (PPM)
Regular, proactive maintenance keeps your systems efficient, reliable and compliant.
- Prevents costly breakdowns
- Extends equipment life
- Ensures regulatory & manufacturer compliance (SFG20, BSRIA, CIBSE)
PPM is most effective when paired with reactive support for total resilience.
Reactive Maintenance
Our engineers diagnose issues fast and always aim for a first-time fix – keeping disruption low and buildings running smoothly.
- Fast fault-finding
- Safe, compliant repairs
- Engineers onsite within two hours in central London
Reactive support works best alongside proactive PPM for complete protection.
Partner with DMG and You’ll Get:
Fast and reliable emergency response
Expert residential engineers
With deep technical knowledge
Proactive and preventative maintenance
Clear, competitive and transparent pricing
24/7 support from real people
No automated menus
Seamless communication
Through our Client Portal
Disaster recovery specialists
For critical systems
DID YOU KNOW?
In October, our call-out time was 102 minutes from time of call to attendance on site.
Minutes
What our Clients Say
“Excellent customer service, consistent prompt response to call outs. An excellent team with extensive technical knowledge, I trust in them entirely… and the communication from the engineers to the admin team is incredibly seamless and nothing is too much to ask.”
Kymberley, Property Manager – May 2025
How We Support You
Experts in keeping residential and commercial buildings safe, warm and efficient.
For over 30 years, we’ve supported property managers and developers with reliable maintenance and engineering for communal heating, hot water and building services.
Our job
To make sure your buildings run cost effectively, efficiently and compliantly.
WHAT WE DO
Expert Services
Heating & Hot Water Systems
Keep your essential systems working safely and efficiently - reducing downtime and resident complaints.
Heat Network & Energy Centres
Experts in communal and district heat networks, we help you stay compliant, efficient and ready for Ofgem 2026.
Planned Maintenance
Prevent costly breakdowns - with regular servicing of equipment in line with manufacturer, statutory and good practice requirements.
Emergency Breakdowns 24/7
Rapid, reliable 24/7 response when you need us most. Our engineers respond within two hours across central London.
Total Heat & Energy Solutions
In partnership with Data Energy, we provide a complete solution - from maintenance and metering to billing and energy management.
Why Choose Us
We take care of your buildings as if they were our own.
30+ years of experience
Maintaining critical systems in residential and commercial buildings for over 30 years.
Award-winning & ISO-accredited
Trusted by property managers across London for quality and reliability.
24/7/365 support
Our engineers respond within two hours across central London, supporting clients whenever critical system failures occur.
Qualified & compliant
Accredited by CIBSE, Gas Safe, NICEIC, ECA, and BESA.
Clear, honest pricing
Straightforward costs with no hidden extras.
Specialists in residential and commercial property management
Dedicated expertise in maintaining residential and commercial property portfolios.
Transparent communication
Live reports and updates through our Client Portal.
Real people on the phone
No automated menus – just knowledgeable support when you need it.
Experts in Disaster Recovery and Critical System Maintenance
Minimising downtime and preventing costly interruptions – we aim to reinstate critical assets at any time of day or night.
Reliable 24/7 support • Experienced engineers • Award-winning service • Built on trust
Client Case Study
Delivering the Impossible for Parkgate Aspen
After a flood caused a total system shutdown, DMG engineers restored full heating within 24 hours – avoiding resident relocations, additional costs and service disruption.
Expert Care for Your Building’s Core Systems
Boilers, HIUs, heat pumps, controls and every major plant room asset – all maintained to the highest standards.
What we cover:
- Boilers & plant
- Heat Interface Units (HIUs)
- Air source heat pumps & new technologies
- Pumps, valves & pressurisation units
- Heat metering – upgrades & replacement
- Cylinders & plate heat exchangers
- BMS & controls
- Water treatment & dosing equipment
- Pipework, distribution & plant room assets
FAQs
What is your emergency response time?
Our average response time for emergency breakdowns is under 2 hours in central London and 4 hours in the South East.
Do you operate 24/7?
Yes – we offer round-the-clock emergency support every day of the year.
What buildings do you work with?
Residential blocks, commercial buildings and retail sites.
What areas do you cover?
London, Greater London and the South East.
What systems do you maintain?
Heating, hot water, heat networks, energy centres, pump sets, HIUs, cylinders, BMS, controls and plant room equipment.
Need support with your buildings?
We’ll help you keep your systems reliable, compliant and running efficiently – 24/7.
Planned Maintenance (PPM)
Reactive Maintenance
Some of our trusted clients
JUST RELEASED
The Compliance Companion Playbook
Clarity. Confidence. Compliance – made simple for Property Managers.
Regulations are evolving fast. Our sister company, Data Energy, has just launched The Compliance Companion Playbook to give you a clear, practical overview of what’s changing, why it matters, and how to prepare.
Get straightforward advice to keep your buildings safe, compliant and future-ready.
Stay Connected
Follow us on LinkedIn for practical insights, handy checklists, and the latest on heat network regulations.
Be the first to access free tools like our ‘5 Maintenance Checks Every Property Manager Needs to Know’ and ’10 Critical Heating Maintenance Checks’.
