Who We Are
Bringing Your Ideas
and Innovations to Life
Dempsey Mechanical Ltd, trading as DMECH, is a leading mechanical services provider established in 2018. Based in London and serving the Home Counties and surrounding areas, we specialise in delivering high-quality plumbing, ventilation, air-conditioning, electrical, and Building Management System (BMS) solutions.
We’re committed to delivering mechanical services that are:
Catering to the commercial, healthcare, and educational sectors, DMECH is committed to creating energy-efficient, comfortable environments built to the highest standards. With a focus on innovation, reliability, and sustainability, the company delivers tailored mechanical services that meet the unique needs of each client, while prioritising long-term performance and operational efficiency.
What We Do
Multi-Disciplined
Engineering Solutions
Commercial plumbing installations designed for efficiency, durability and compliance across all project types.
High-performance ventilation solutions that improve air quality and support comfortable, safe building environments.
Energy-efficient cooling systems tailored to your building’s needs, ensuring dependable climate control all year round.
Safe, precise electrical services supporting modern infrastructure, from full installations to system upgrades.
Smart controls that optimise performance, reduce energy use and give you full oversight of your building’s operation.
Planned, preventative and reactive maintenance services that protect system performance and reduce long-term costs.
Why Choose Us
Designing the
Future of Building
Performance
We Develop Unique Projects
Every system is designed around your building’s requirements, ensuring efficiency, performance, and seamless integration with existing infrastructure.
We Value Quality, Safety & Reliability
All installations follow strict safety procedures and industry compliance, giving you confidence in long-term operational performance.
Experienced Engineers Who Know Your Sector
Our team brings proven experience across commercial, healthcare, and educational environments — ensuring every project is delivered to the highest standard.
We Use Innovative Technology
From advanced BMS controls to modern HVAC solutions, we work with leading technologies to future-proof your building and reduce energy costs.
We Focus on Long-Term Value
Our approach prioritises reliability, energy efficiency, and ease of maintenance, delivering systems built for performance year after year.