About

Fabricating excellence for over 16 years

Our History

In 2006 the business was started by Gav Johnson who was looking for a new challenge. Originally located in the blue mountains and operating as a one-man business from a small workshop. Katoomba steel works, as it was then known has thrived and enjoyed a constant but controlled growth, with hard work, determination and a lot of long days the business eventually outgrew the factory in Katoomba. In 2009 the business changed its name to GSJ Fabrications and relocated to larger workshop in Penrith.

Over the next 4 years GSJ continued moving forwarded and focusing on building a strong client base, by offering a very high level of service and delivering a quality product on time and budget. Due to the significant increase in workload and growing customer base in 2012 GSJ moved again to a much larger workshop located in St Mary’s. Then in late 2016 GSJ moved once again, jumping on a good opportunity we purchased our new permanent workshop.

Our Capabilities

The business now employs over 30 full-time staff working in the workshop and on-site, and it is our aim to offer the best possible service.

We have the expertise and equipment to make us an excellent one-stop-shop for all your fabrication needs. We are capable of providing services in many different areas of the steel industry including Structural, Sheet Metal, Pipe work and more in various materials such as Stainless Steel, Mild Steel and Aluminium.

We can also assist with external services like Galvanising, Powder Coating, Painting, Engineering, Drafting, Laser Cutting and much more.

Recent Projects

Below are some projects that demonstrate our capabilities. If you would like to see more go to our projects page.

Winmalee Inlet and Dewatering Upgrade

Approximate value $2 – $2.5M

  • Fabrication and install of all stainless pipework from Dn150 to Dn1100.
  • Installation of fine screens, screw and out loading conveyors.
  • Onsite laminating and install of all fibreglass components for odour ducting, structural beams and floor plates.
  • Fabrication and installation of steel platforms, handrails and pipe supports.
  • Installation of penstocks and isolation stop boards.
Penrith Dewatering Upgrade

Approximately value $1.5M

  • Fabricated and supplied all structural steel pipe supports.
  • Supplied and installed approximately 300m of rolled pipe to digesters.
  • Fabricate and installation of all stainless pipework.
  • Fabrication of RDT skids.
  • Manufacture of custom stainless steel out loading chutes.
St Marys Pump Station Refurbishment

Approximate value $1.2M – $1.5M

  • Removal of all ageing pumps, valves and DICL pipework ranging from DN450 to DN900.
  • Site measure, fabrication and installation of new stainless steel pipework including custom Dn750 to Dn900 reducers.
  • Fabrication and install of steel access platforms and ladders.
  • Installation of custom fabricated tee pieces in the valve chamber.
West Hornsby Dewatering

Approximate value $700K – $1M

  • Fabrication and install of all stainless pipework.
  • Existing steelwork upgrade and install of centrifuges.
  • Installation of all pumps and skids.
  • Manufacture of stainless steel tanks and sludge hoppers.
Other works include:
  1. Fabrication and hydro test of approximately 90 cast in spools for west Camden upgrade.
  2. Replacement of several sludge scrapper systems on various sites.
  3. Modification and install of odour unit at west Camden.
  4. Fabrication and supply of hatches and covers.
  5. Riverstone filtration upgrade.

Our Clients