A building's foundation is its entire structural base — and when it fails, every element above is at risk. Footing movement, settlement, or failure can cause cracks in walls, uneven floors, sticking doors and windows, and in severe cases, progressive collapse. These issues are often caused by soil movement, poor original design, drainage failures, or long-term water ingress.

Atomic Projects approaches foundation and footing repairs with engineering precision, addressing not only the visible symptoms but the underlying cause. Our focus is on stabilising the structure for the long term, ensuring load transfer is re-established and soil conditions are managed to prevent recurrence.

Our Process for Foundation & Footing Repairs

1. Engineering Assessment
   • Detailed inspection by structural engineers to determine the cause and extent of movement.
   • Soil testing to identify shrink-swell potential, bearing capacity, and moisture variation.
   • Crack monitoring and level surveys to measure active vs historic movement.
2. Access & Preparation
   • Secure and support structure before commencing works.
   • Excavate to expose existing footings without overloading remaining structure.
3. Repair & Strengthening Methods
   • Underpinning: Traditional mass concrete underpinning for shallow depth repairs. Steel screw piles or push piers for deep foundations and poor soil conditions.
   • Micropiles: Installed in restricted access areas to provide deep load transfer.
   • Slab Jacking / Resin Injection: For minor slab settlement, lifting and re-levelling concrete floors.
4. Drainage & Moisture Management
   • Install subsoil drains, ag lines, and stormwater diversion to prevent future soil moisture fluctuations.
   • Improve surface grading to direct water away from the building footprint.
5. Reinstatement
   • Replace or upgrade footings where original materials are inadequate.
   • Reinstate landscaping, hard surfaces, and finishes with minimal disturbance.

Applications

• Residential & Multi-Storey Buildings: Addressing settlement cracks and floor level changes.
• Commercial & Industrial Structures: Heavy load environments requiring higher capacity footings.
• Heritage Buildings: Foundation stabilisation with minimal impact to original fabric.
• Flood & Storm-Damaged Sites: Recovery of footings after erosion or scouring events.

Why Atomic Projects for Foundation & Footing Repairs

• Integrated Solutions: We combine engineering, geotechnical, and construction expertise for a single point of responsibility.
• Minimal Disruption: Systems designed for occupied buildings to minimise downtime.
• Future-Proofing: Every repair includes drainage and soil management considerations to avoid repeat issues.

Frequently Asked Questions

What are the warning signs that a building has foundation problems?

The most common indicators are diagonal cracking at door and window corners, cracks that are wider at the top than the bottom (indicating differential settlement), doors and windows that have started sticking or no longer close correctly, and visible gaps between the building and its perimeter paving or landscaping. Cracks in themselves don't always mean foundation failure — but any crack wider than 2mm in a masonry wall, or visible floor level differences, warrant an engineering assessment.

Can foundation repairs be done without vacating the building?

In most cases, yes. Underpinning and micropile systems can be installed from outside the building footprint or through small internal excavations, allowing occupants to remain in place. The most common requirement is temporary access restrictions to work areas and occasional noise/vibration during drilling or excavation. We sequence work to ensure the building remains structurally stable and accessible throughout the program.

What causes foundation movement in Sydney buildings?

Sydney has significant variation in subsurface conditions. Clay soils in areas like Blacktown, Parramatta, and the Hills District are highly shrink-swell reactive — they expand when wet and contract when dry, causing seasonal foundation movement. In coastal areas, erosion and wash-out of sandy soils can undermine footings over time. Poor original construction — shallow footings, undersized concrete, no subsoil drainage — is also a common underlying factor in older residential buildings.

How is underpinning different from resin injection?

Underpinning involves physically extending the footing deeper into stable soil or rock, typically by excavating in small bays and pouring new concrete beneath the existing footing. It's the most robust solution for significant settlement and poor bearing capacity. Resin injection (slab jacking) uses expanding polyurethane foam injected through small holes to lift and re-level settled concrete slabs — it's faster and less invasive, but suited to minor settlement in lighter structures, not significant structural movement.

Does foundation repair require an engineer's report?

Yes, always. Foundation repairs affect the structural integrity of the entire building and must be designed by a structural engineer. In NSW, foundation work in Class 1 and 2 buildings also requires a Construction Certificate and inspection by a certifier. We co-ordinate engineering design and certification as part of our scope, ensuring all works comply with AS 2159 (Piling — Design and Installation) and AS 3600 (Concrete Structures) as applicable.

Related Services

• Temporary Propping & Shoring
• Load-Bearing Wall Alterations
• Concrete Spalling & Cancer Repair
• Waterproofing Remediation
• Building Investigations & Reporting

Foundation and footing repairs are a structural safety priority. Done correctly, they stop progressive damage, extend the building's lifespan, and protect the owner's investment. As a Class 2 Registered Builder with over 10 years of experience in structural remediation across Sydney, Atomic Projects delivers foundation repairs that are engineered, compliant, and built to last. Call us on 0410 515 509 or email hello@atomicprojects.com.au to arrange an assessment.