Physical & Structural Due Diligence

Physical and structural due diligence is the investigation of a property’s building condition, structural integrity and building services undertaken by a prospective purchaser prior to acquisition, directed at identifying defects, non-compliance with applicable building standards, and future capital expenditure requirements that are not apparent from a visual inspection alone or from vendor representations.

The depth of physical and structural due diligence undertaken varies with asset class and transaction value. A residential purchaser typically commissions a standard pre-purchase building and pest inspection, while a purchaser of an older commercial or industrial asset frequently engages a structural engineer to prepare a detailed condition and capital expenditure assessment addressing matters beyond the scope of a standard inspection.

This node addresses the principal methods and scope of physical and structural due diligence applied in the Australian property market, the professionals typically engaged, and the way findings inform contract negotiation and acquisition budgeting. It sits within the broader due diligence framework addressed elsewhere in this sub-series and connects to the building codes and defects content addressed in the property development series.

This node covers:

• Pre-purchase building inspection practice, structural engineering assessment, review of essential building services, defect classification, and the identification of asbestos and other hazardous materials at a general level appropriate to a purchaser’s due diligence process

This node does not cover:

• Detailed engineering certification methodology or building code compliance assessment procedures, the domain of qualified building surveyors and engineers
• Environmental contamination of land → refer to Node 33540
• Advice on the condition of any specific property

• National Construction Code

  Australian Building Codes Board, administered jointly with state and territory building regulators

  Establishes minimum construction and performance standards against which the physical condition and compliance of a building is assessed during due diligence.
• State and territory home building and building regulation legislation (e.g. Home Building Act 1989 (NSW), Building Act 1993 (Vic))

  State building regulators and consumer protection agencies

  Establishes statutory warranty periods for residential building defects and licensing requirements for building inspectors and practitioners engaged to conduct due diligence assessments.
• Model Work Health and Safety Regulations, asbestos provisions

  Safe Work Australia and state work health and safety regulators

  Establishes obligations for the identification, management and removal of asbestos-containing materials, relevant to hazardous materials assessment conducted during physical due diligence.
• Australian Standard AS 4349.1

  Standards Australia

  Provides the industry standard methodology for pre-purchase property inspections adopted by licensed building inspectors across Australian jurisdictions, establishing the scope and reporting format of a standard inspection.

A purchaser acquiring an established dwelling typically commissions a pre-purchase building inspection prior to exchange or within a due diligence period, with the inspection report informing the purchaser’s decision to proceed, negotiate a price adjustment, or withdraw. For commercial, industrial and larger residential assets, the purchaser’s due diligence team commonly extends beyond a standard inspection to include a structural engineer or building surveyor engaged to assess elements outside the scope of a standard visual inspection, particularly where the asset’s age or prior use suggests elevated structural or compliance risk.

Findings from physical and structural due diligence are typically translated into either a renegotiated purchase price, a contractual requirement for the vendor to rectify identified defects prior to settlement, or an allowance built into the purchaser’s capital expenditure forecast for the asset. The materiality of a defect, rather than its mere existence, generally determines which of these responses is adopted.