1800 623 312
Australia
Welcome to Mainmark Sydney NSW
Your Trusted Ground Engineering Experts in New South Wales
Since 1989, we’ve been the trusted ground engineering and asset preservation partner in Australia. With our head office located in Northbridge, Sydney, we have established ourselves as the leader in re-levelling across the country.
We draw on over three decades of experience and knowledge to lead, develop, and deliver the most advanced and accurate ground improvement, re-levelling, and void-filling solutions for residential, commercial, infrastructure, and mining sectors.
Head Office Details
Address
169 Sailors Bay Road, Northbridge NSW 2063
Phone
1800 623 312
customerservice@mainmark.com
Opening Hours
Monday to Friday 9:00am – 5:00pm
Saturday & Sunday Closed
Find Us on Google Maps
169 Sailors Bay Road, Northbridge, Sydney, NSW 2063, Australia.
Mainmark Sydney Google Reviews
Why Choose Mainmark?
The Mainmark Difference
Pioneers Of Resin Injection in Australia
Founded in 1989, Mainmark pioneered Resin Injection technology in Australia.
In-house Engineers
Our in-house engineers bring extensive knowledge and experience to every project and can be tailored to meet specific requirements.
Iso Accreditation
Mainmark is proud to have achieved and maintained our ISO Accreditation since 2017.
Guaranteeing risk mitigation and operational excellence.
Award-Winning Ground Engineering Company
Delivering the world’s most advanced, innovative and accurate ground engineering solutions and technologies.
Global Reach with Local Expertise
Where global experience, innovation and technical knowledge, meet to deliver dynamic local expertise.
50 Year Product Warranty
We offer an exceptional 50-year product warranty for your peace of mind.
Our Technologies
Teretek ®
Our Teretek® technology provides a solution to address subsided structures, improve ground, and fill voids.
Terefil®
Our Terefil technology provides an advanced lightweight cellular concrete for soil replacement, large void filling, and pipe abandonment.
JOG Computer-Controlled Grouting
Our JOG technology is a state of the art, computer controlled, multipoint injection system.
Contact Us – Mainmark Sydney
Arrange a site assessment in 3 simple steps:
Step 1
Submit your enquiry using our online form. Include a brief message about the type of foundation issues you are experiencing.
Step 2
Our friendly customer service team will be in touch to schedule a site assessment that suits you.
Step 3
One of the Mainmark experts will visit your commercial property, assess the damage, and ascertain the likely cause. They will establish the approach needed, creating a plan specific to the needs of your building and provide you with a detailed quote.
© 2026 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.
Mainmark Ground Engineering Pty Ltd
ABN: 51 606 182 503
