Our Key People

Greg Castle

Director, Owner, Chief Quality Controller

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 of 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.


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 7668 during our business hours (9am to 5pm).

Our Principal Contractors include;

Our Certifications and Associations