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Who are we?

Your experienced local Darwin plumbers

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Trademark Plumbing and Gasfitting Pty Ltd, established in 2003.


We are a small to medium Darwin owned, family business.


Stephen, aka Harry, is the Managing Director of Trademark and has lived in Darwin most of his adult life. 

Stephen has been a licenced gas fitter and plumber since 1988.

Tania, is the office manager.  She has a background of quality and safety within the health industry. Though always a part of Trademark she left nursing in 2019 to be full time in the family business.

We understand the complexity of living in a regional area, and getting the product you require for your project.  If we can't help you we will always advise on who can.


Trademarks aim is to support locals.  We employ local, and our first choice is to buy local.


We can assist you with any plumbing project that you might have.  This includes new works or repairs. We have experience in residential, commercial, remote communities and mine sites across the Northern Territory. We pride ourselves on completing your 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

2022/2021/2020/2019  Darwin Clay Target Club and Top End Clay Target Club

2020/21 - Zac Grimshaw Racing


2019 Jabiru Pistol Club and the NT ISSF Olympic Trap Ladies Team.  


Member of Territory Proud.


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