Business Details
Emergency
services
Trusted Mechanical & Electrical Contractors in the UK
Established in 1893, we are a leading mechanical and electrical contracting firm specialising in new build housing developments and commercial projects across the UK. Our expertise spans plumbing, heating, electrical systems, and renewable energy solutions, underpinned by a commitment to quality craftsmanship and innovation. With over 130 years of experience, we have grown from a family business into a national operation employing 300 people, delivering 100 live projects simultaneously. Our values prioritise client satisfaction, environmental responsibility, and on-site safety, fostering long-term partnerships with major housing developers and local authorities. We invest in continuous training, having supported over 500 apprenticeships since 2010, ensuring our workforce remains at the forefront of industry advancements.Accredited by NICEIC and MCS, we specialise in air source heat pumps, solar PV installations, and EV charging infrastructure, aligning with future sustainability standards. Our 24/7 maintenance division guarantees rapid response times, while our dedication to sustainable practices minimises environmental impact. Offices in the North East, Yorkshire, and Scotland enable nationwide service delivery, combining regional expertise with national resources. We maintain rigorous safety protocols and regulatory compliance, evidenced by our accreditations from BPEC, OFTEC, and the Office for Zero Emission Vehicles. Looking ahead, we continue to innovate in low-carbon technologies, reinforcing our position as a trusted subcontractor for major construction projects.
Services
Air Source Heat Pumps
Electrical
Refurbishment
Maintenance
Renewables
Plumbing & Heating
Sustainability
Highlights and features
- We have over 130 years of experience in mechanical and electrical contracting.
- Our 300-strong workforce delivers up to 100 live projects simultaneously.
- We are MCS accredited for renewable energy installations.
- Our 24/7 maintenance division ensures rapid response times.
- We have supported over 500 apprenticeships since 2010.
Associations and certifications
- NICEIC
- Microgeneration Certification Scheme (MCS)
- British Plumbing Employers Council (BPEC)
- OFTEC
- LCL Awards
- Office for Zero Emission Vehicles
What people say
Reliable partner
Excellent workmanship
Outstanding customer service
Approachable team
Value for money
Services
Air Source Heat Pumps
We install air source heat pumps accredited by MCS since 2010. Our trained team ensures compliance with Future Homes Standard requirements, providing low-carbon heating solutions for residential and commercial developments. This service reduces reliance on natural gas while maintaining energy efficiency.
Electrical
NICEIC-registered electrical installations cover housing developments, commercial rewires, and smart home systems. Our certified electricians deliver safe, code-compliant solutions including lighting, telecoms, and street lighting while prioritising sustainability and modern energy demands.
Maintenance
24/7 maintenance division handles plumbing, heating, electrical, and renewable system repairs. Rapid response times ensure minimal disruption, with dedicated customer care teams available year-round to address urgent requirements efficiently and professionally.
Renewables
Specialists in solar PV, EV charging points, and wastewater heat recovery systems. MCS-certified installations align with sustainability goals, reducing carbon footprints through technologies like mechanical ventilation with heat recovery and electrical energy storage systems.
Plumbing & Heating
Gas-safe engineers install and upgrade heating systems across 100,000+ properties. Services include plant room installations, drainage, and water supply systems using modern tools to ensure timely completion with minimal operational disruption for residential and commercial clients.
Questions
What services does John N Dunn offer?
We provide mechanical and electrical contracting services including air source heat pumps, electrical installations, plumbing, refurbishments, and renewable energy solutions for residential and commercial projects.
Which areas do you operate in?
We operate nationwide with offices in the North East, Yorkshire, and Scotland, serving housing developers and commercial clients across the UK.
Are you accredited for renewable energy installations?
Yes, we hold MCS accreditation for air source heat pumps, solar PV, and electrical energy storage systems, along with OFTEC and BPEC certifications.
Do you offer 24/7 emergency services?
Our maintenance division provides 24/7 emergency repair services for plumbing, heating, electrical, and renewable systems to ensure rapid resolution of urgent issues.
How do you support workforce development?
We invest in apprenticeships, having trained over 500 plumbers and electricians since 2010, ensuring our team maintains industry-leading skills and knowledge.
