Sydney's Trusted Remedial Building Experts
Concrete Repair, Waterproofing & Structural Solutions — protecting Sydney's buildings for over 15 years. Licensed, insured and trusted by strata managers across Greater Sydney.
✓ Free site assessment ✓ Fixed-price quotes ✓ No obligation
15+
Years Experience
500+
Projects Completed
100%
Licensed & Insured
200+
Strata Schemes Served
What We Do
Specialist Remedial Building Services
From concrete spalling repair to full facade restoration, our licensed remedial builders deliver engineered solutions that stand the test of time.
Concrete Repair
Professional concrete repair for deteriorating structures across Sydney.
Crack Injection
Precision epoxy and polyurethane crack injection to seal structural and non-structural cracks.
Balcony Waterproofing
Specialist balcony waterproofing and membrane systems for residential and strata buildings.
Facade Restoration
Complete building facade restoration, render repair and protective coating systems.
Structural Strengthening
Carbon fibre FRP and structural steel solutions to upgrade load capacity of existing buildings.
Building Refurbishment
Full building refurbishment and upgrade services to extend the life of Sydney's built assets.
Strata Remedial Services
End-to-end remedial building services for strata schemes and body corporates across Sydney.
Why Choose Us
The Cornerstone Difference
We don't just repair buildings — we protect investments. Every project begins with a thorough engineering assessment and ends with documented, warranted work.
Licensed Remedial Builders
Fully licensed under the NSW Building Act with specialist remedial accreditation. Every project is executed by qualified tradespeople under direct supervision.
Engineering-Backed Solutions
We partner with structural engineers and waterproofing consultants to ensure every repair is properly diagnosed and specified before works commence.
On-Time, On-Budget Delivery
Transparent pricing, clear milestones and a track record of delivering projects within agreed timeframes — critical for strata and commercial clients.
Strata Specialists
Extensive experience working with strata managers and owners corporations across 200+ schemes. We handle everything from OC notifications to defects liability.
15+
Years of Expertise
Our Work
Featured Projects
Real results for real clients. Browse a selection of our recent remedial building projects across Greater Sydney.
Balcony Waterproofing & Concrete RepairMarrickville Apartment Complex
48-unit residential block — full balcony membrane replacement, concrete spalling repair and corrosion treatment across 96 balconies.
15-year membrane warranty achieved
Facade RestorationInner West Commercial Tower
12-storey commercial building facade — full render removal and reinstatement, crack injection and anti-carbonation protective coating.
Building life extended by 25+ years
Strata Remedial ProgramBankstown Strata Remediation
72-unit strata scheme — multi-trade remedial program covering waterproofing, structural repairs, car park rehabilitation and painting.
$1.2M remedial program delivered on budget
Client Testimonials
Trusted by Strata Managers Across Sydney
Don't take our word for it — hear from the strata managers, building owners and committees who trust Cornerstone.
“Cornerstone completed the balcony waterproofing and concrete repair across our 48-unit complex in Marrickville on time and within budget. Their communication with residents was excellent and the quality of work was outstanding. I wouldn't hesitate to recommend them.”
Michael T.
Strata Manager, Inner West Sydney
“We had significant facade deterioration on our 1970s apartment block. Cornerstone provided a thorough assessment, a competitive fixed-price quote, and delivered exceptional results. The building looks better than it has in decades.”
Sarah L.
Building Owner, Bankstown
“The crack injection and structural strengthening works on our car park were technically complex. Cornerstone brought in an engineer from day one and managed the whole project seamlessly. A truly professional operation.”
David R.
Executive Committee Chair
Service Areas
Servicing All of Greater Sydney
Based in Marrickville, we service strata, commercial and residential clients across the Greater Sydney Metropolitan Area.
Limited Availability
Request Your Free Quote Today
Our team typically responds within 24 hours. For urgent assessments, call us directly.
Free site assessment included
Fixed-price, no-surprise quotes
Response within 24 hours
No obligation whatsoever