Our Key People

Greg Castle

Director, Chief Quality Controller and Majority Shareholder

Greg is a fully qualified and licenced plumber with more than 20 years hands-on experience. Following a successful plumbing career working with his father, in 2005 Greg established the business that is today Obsidian Plumbing.

He has lead the business throughout its significant growth by focussing on developing exceptional client relationships, establishing a professional team of trades and support personnel and being committed to the delivery quality outcomes.

Damien Overeem

Operations Manager

Originally working as a consultant to the business, Damian joined the Obsidian Plumbing team in 2013. He has more than 18 years industry experience and has worked on a number of high profile major projects across a wide range of sectors including industrial, commercial, health, education, Government and civil infrastructure.

Damian’s role covers all aspects of construction operation and he is particularly focused on client liaison, estimating and cost planning in both the pre and post construction stages.

Warick Gifford

Commercial Finance Manager and Shareholder

Warick has been with Obsidian Plumbing from the day we first opened our doors, originally joining the early team to assist Greg with the commercial management of the business. Over time Greg and Warick have developed a successful business partnership, with Warick playing a major part in ensuring we grew at a rate that was sustainable in the long term.

His role is vital to the ongoing success of the business and he leads our annual strategic planning and budgeting process.


If you would like to find our about our abilities and experience to meet your project specifications or other criteria, please download our capability statement.


If you have a question regarding our services or need to talk to us regarding quotes, please call us on 07 5568 7688 during our business hours (9am to 5pm).

Our Principal Contractors include;

Our Certifications and Associations