Industrial Pipework Specialists 

JMG specialises in industrial pipework - fabrication and installation - and was founded by Jonathan Granfield in 1985. 

A Complete Solution 

We offer a complete mechanical and electrical solution for all your pipework installation needs from off-site fabrication, to on-site erection, plant installation, maintenance, testing and commissioning. Our services include new projects as well as refurbishment and re-fit work. We also understand that how we work is just as important as what we do.  

Trusted Partner 

JMG's first client was Glaxo Pharmaceuticals at their manufacturing site in Ware, Hertfordshire. 
Since then JMG has grown and completed work across numerous sectors including Food & Beverage, Schools & Colleges, other Pharmaceutical companies and individual projects for a diverse range of businesses. 
 
30 years later, JMG continues to work in these specialist sectors whilst also regularly delivering projects for GlaxoSmithkline across its various sites. JMG also has a team of 20 people providing on-site electrical and mechanical prevention and maintenance for Glaxo at its manufacturing site in Hertfordshire - where it all began 30 years ago.  
 
JMG, a trusted partner, tried and tested. 
 
 
 
 
"I have always found JMG a very pro-active, flexible and responsive contractor with a high standard of workmanship. Jon and his team are easy to work with, always professional, efficient and knowledgeable and would highly recommend them to anyone without hesitation." 
 
Sarah Moore, Project Engineer, Ameresco