Two engineers in hard hats reviewing plans on site

Remedial EngineeringDiagnosing & Repairing Structural Defects

Structural defect diagnosis, remediation design, crack investigation, foundation settlement assessment, and building movement analysis — for residential and commercial buildings across NSW.

REMEDIAL.

Remedial Engineering

Structural defects rarely announce themselves — but they always leave evidence

Cracking in walls, sticking doors and windows, uneven floors, visible sagging in beams or ceilings, and gaps forming at junctions between building elements are all signs that a structure is moving or that a structural element is distressed. These symptoms are the evidence — and understanding the cause requires a systematic engineering investigation, not a quick visual inspection followed by a generic repair recommendation.

At IA Engineering, we provide structural defect diagnosis and remediation engineering for residential and commercial buildings across NSW. Our process begins with a thorough inspection and investigation — reviewing construction documents, measuring the extent of movement, assessing soil and drainage conditions, and identifying the structural mechanism that is causing the problem. The remediation design follows from the diagnosis, not the other way around.

Our remedial engineering services are used by homeowners, property purchasers, strata committees, builders disputing defect claims, and insurers managing property damage claims. We provide independent, expert written reports that clearly explain the cause of the defect, the risk it presents, and the engineering solution required to address it permanently.

Close-up of a diagonal crack in a concrete wall during structural defect investigation
Defect Diagnosis & Remediation

Diagnose first. Then design the repair.

Every remediation design we produce is based on a proper understanding of why the defect occurred. Without a correct diagnosis, the repair addresses the symptom but not the cause — and the problem returns.

  • Structural defect inspection and diagnosis
  • Foundation settlement and movement analysis
  • Crack investigation and classification
  • Remediation design and engineering certification

Foundation Settlement

Most structural movement in Australian homes starts below the slab.

Australia has one of the most reactive clay soil profiles in the world. Reactive clays shrink when dry and swell when wet — and this seasonal movement, over time, can cause differential settlement in residential footings that manifests as cracking in walls and ceilings, sticking doors and windows, and visible deflection in floors. In severe cases, footing movement can cause significant structural damage that requires underpinning or partial rebuilding.

Diagnosing a foundation settlement problem requires more than observing the cracks. It requires understanding the soil classification, the original footing design, the current moisture conditions under and around the slab, any changes to drainage or vegetation in recent years, and the extent and pattern of movement across the building. Each of these factors contributes to the diagnosis — and all of them inform the remediation design.

Our foundation settlement investigations combine a structural inspection of the building with a review of geotechnical data and drainage conditions. Where active movement is occurring, we install monitoring points and review them over time before recommending an intervention — ensuring the remediation is appropriate for the severity and direction of the movement, not premature or excessive.

Our remedial engineering services

  • Structural defect inspection & diagnosisSystematic inspection of the building, measurement of deflection and crack widths, and written diagnosis report identifying the cause of the defects.
  • Crack investigation & classificationClassification of cracking to AS 2870 severity levels, assessment of whether cracking is structural or cosmetic, and monitoring recommendations where active movement is suspected.
  • Foundation settlement analysisAssessment of differential footing settlement, reactive clay behaviour, drainage and vegetation influences, and the implications for the structural integrity of the building.
  • Building movement analysisAnalysis of overall building movement — including tilt, lateral drift, and differential deflection — using survey data and structural modelling where required.
  • Underpinning & footing remediation designEngineering design for underpinning, slab lifting, pier installation, or other foundation remediation strategies to stabilise a settling or moving footing system.
  • Expert reports for legal & insurance purposesIndependent expert structural engineering reports suitable for strata disputes, insurance claims, building defect legal proceedings, and NCAT hearings.

Our Scope

Types of remedial engineering we provide

Our remedial engineering team works across residential homes, strata buildings, commercial properties, and industrial structures throughout Greater Sydney and NSW — diagnosing defects, designing repairs, and providing expert reports that stand up to independent scrutiny.

Residential Home Defect Investigations

Investigation and diagnosis of structural defects in houses, townhouses, and units — including cracking, sagging floors, deflecting beams, compromised connections, and building movement. We provide written reports that classify the defects, explain the cause, and recommend remediation — in language the owner, builder, and insurer can all understand.

Strata Building Defect Reports

Structural defect investigations for strata buildings within the statutory defect liability period — providing the owners corporation with independent engineering evidence of structural defects to support rectification claims against the builder under the Design and Building Practitioners Act 2020 (NSW).

Foundation & Underpinning Design

Engineering design for foundation remediation — including conventional underpinning, screw pile underpinning, resin injection slab lifting, and footing extension — for buildings experiencing active foundation settlement. We assess the cause of the movement before specifying the intervention strategy to ensure the solution is permanent.

Expert Reports for Disputes & Insurance

Independent structural engineering expert reports for building defect disputes, insurance claims, NCAT proceedings, and litigation. Our reports are prepared to comply with expert witness requirements — clearly stating the basis for each finding and distinguishing between facts observed and engineering opinions formed.

“The question in remedial engineering is never just what is broken — it is why it broke, and whether the repair will prevent it from breaking again.”

IA Engineering Design Team
AS 2870
Residential Slabs & Footings
DBP Act
NSW 2020 Compliant
All NSW
Councils & LGAs
RPE
Certified Every Report

The Engineering

How we investigate a structural defect

Our defect investigation process begins with a comprehensive site inspection — reviewing all accessible areas of the building, documenting crack locations and widths, measuring deflections, and assessing drainage conditions around the foundation. We review all available construction documents, geotechnical reports, and any previous repair or inspection records.

For active movement situations, we install monitoring points before recommending intervention — so the remediation is calibrated to the severity of the movement and the direction of the differential settlement. Premature intervention on a building that is still moving can do more damage than the original defect.

Our investigation reports identify each defect, classify its severity, establish the probable cause, assess the structural risk, and recommend a remediation approach. Where a defect has legal implications — insurance, strata disputes, or construction litigation — the report is prepared to comply with expert witness requirements under the Uniform Civil Procedure Rules.

Remedial engineering inspection and structural defect assessment

Standards & Compliance

Every remedial engineering report certified by Registered Professional Engineers

All structural assessments and remedial designs issued by IA Engineering carry the signature and certification of a Registered Professional Engineer (RPE) in New South Wales. Our investigation reports satisfy the requirements of NSW councils, private certifiers, insurers, and legal proceedings — providing independent expert opinion on structural defects that the relevant parties can rely on.

AS 2870 Residential Slabs & FootingsAS 3600 Concrete StructuresAS 3700 Masonry StructuresAS/NZS 1170 Structural ActionsDesign & Building Practitioners Act 2020NCC / BCA Compliant

Our Approach

How we work with you

Remedial engineering engagements are often time-sensitive — owners are anxious, legal processes have deadlines, and in some cases the structure presents an ongoing safety risk. We respond promptly to initial enquiries, provide a clear scope and fee proposal before any inspection is conducted, and communicate findings directly and plainly — without minimising defects or overstating them.

For homeowners and strata committees, we explain technical findings in plain language and advise on the urgency of recommended actions. For legal representatives, we prepare reports that comply with expert witness obligations and can withstand cross-examination. We do not soften findings for the convenience of any party — our obligation is to the facts and to the engineering.

Once a remediation is designed and approved, we remain available to support the builder through construction — answering RFIs, conducting hold-point inspections, and issuing completion certificates that confirm the works have been carried out in accordance with the engineering design.

Diagnose the Cause. Design the Fix. Certify the Result.

Dealing with a structural defect or building movement?

From crack investigation and foundation settlement diagnosis to full remediation design and expert reports, our team provides independent remedial engineering that property owners, strata committees, and legal teams can rely on.

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1300 911 671