About Cornerstone
Sydney's Trusted Remedial Building Specialists
Founded on the principles of integrity, technical excellence and genuine partnership with our clients, Cornerstone Remedial Builders has been protecting Sydney's buildings for over 15 years.
Our Story
Built on Experience. Driven by Results.
Cornerstone Remedial Builders was established with a clear purpose: to deliver the kind of specialist remedial building services that Sydney's aging building stock urgently needs — done properly, with qualified people, backed by engineering and warranted for the long term.
Based in Marrickville in Sydney's Inner West, we are ideally positioned to serve clients across the metropolitan area. Our team of licensed builders, waterproofers and structural specialists brings deep expertise to every project, from a single cracked balcony to a $2M multi-building strata remediation program.
Over 15 years, we have built a reputation among Sydney's most discerning strata managers, owners corporations and commercial building owners for delivering honest advice, accurate pricing and exceptional workmanship — consistently, project after project.
15+
Years Experience
500+
Projects Delivered
200+
Strata Schemes
What We Stand For
Our Mission & Values
Our mission is to protect the structural integrity of Sydney's buildings through technically sound, transparently priced and expertly executed remedial solutions.
Integrity
We tell you what your building actually needs — not what generates the biggest invoice. Our assessments are honest, our pricing transparent and our advice sound.
Excellence
We hold our workmanship to the highest standard on every project, from a single balcony repair to a complex multi-building remedial program.
Partnership
We work as an extension of your team — keeping strata managers, owners corporations and building owners informed and confident at every stage.
Safety
Zero-harm is not just a goal — it is our baseline. Every worker is trained, every site is managed and every risk is controlled.
Credentials
Licensed, Certified & Insured
Every aspect of our business is properly licensed, insured and certified. When you engage Cornerstone, you can be confident that your project is in fully qualified hands.
NSW Licensed Builder (Contractor Licence)
Specialist Remedial Building Accreditation
Public Liability Insurance — $20M
Workers Compensation Insurance
AS 3600 Concrete Structures Compliant
AS 3740 Waterproofing Compliant
Waterproofing Licence (NSW)
Height Safety Accredited
5-star rated by strata managers
Our People
Meet the Team
Our team of licensed professionals brings decades of combined experience to every Cornerstone project.
James Tomaras
Director & Licensed Builder
15+ years in remedial construction, including major strata remediation programs across Greater Sydney. James leads all project assessments and quality oversight.
Marcus Chen
Project Manager
Specialist in multi-building remedial programs and strata client management. Marcus has overseen 200+ strata remediation projects across NSW.
David Papadopoulos
Lead Waterproofing Specialist
Licensed waterproofer with 12 years of experience in balcony, podium and wet area waterproofing. David holds AS 3740 accreditation and leads all membrane installations.
Ready to Work With Sydney's Best?
Contact us today for a free, no-obligation assessment and quote for your building.