About Us

Your experienced local NT plumbers

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Trademark Plumbing and Gasfitting Pty Ltd, established in Darwin, Northern Territory in 2003. Over its years of trading, the small to medium locally owned family business has continued to expand and develop.


Stephen aka Harry, is the Managing Director of Trademark and is a long-standing resident of Darwin.  Stephen has extensive experience and a wealth of knowledge in both gas fitting and plumbing. He understands the complexity of living remote and getting the product you require for your project.  If he can't help you he will always advise on who could.


Trademark supports local.  We employ local, and our first choice is to buy local.


Trademark offers a range of services to Darwin and surrounds in all areas of plumbing and gasfitting including residential, commercial, remote communities and mine sites across the Northern Territory. We pride ourselves on completing projects efficiently and effectively with our reliable team. 



  • Trademark has a high safety standard with a comprehensive safety management plan

  • Experience with working within others safety requirements 

  • Experience with high-risk work and working with permits

  • Up to date licences.


Trademark holds

  • CAL accredited

  • Insurances such as liability and workers compensation.

Community involvement

In 2020 Trademark supports Darwin Clay Target Club and Top End Clay Target Club,

In 2019 the above clubs including Jabiru Pistol Club and the NT ISSF Olympic Trap Ladies Team.  



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