Latent conditions
Latent conditions are hidden or unforeseen site conditions discovered during construction that differ from what could reasonably be anticipated at contract signing.
Ask Chalkline about this →Latent conditions are physical conditions at a construction site that exist at the time of contract signing but are not reasonably discoverable by a competent builder carrying out a pre-contract inspection. Common examples include undisclosed filled ground, buried services, unexpected groundwater, concealed structural elements, or unsuitable subsoil materials that differ materially from what the site classification or surface inspection suggested.
Under HIA residential contracts, builder-initiated variations are permitted for conditions “that could not reasonably have been foreseen by the builder at the time the contract was entered into.” This makes latent conditions a valid ground for a variation claim. The builder must serve a written variation notice promptly on discovering the condition: waiting until the work is complete substantially weakens the claim.
A site-specific geotechnical report reduces latent condition risk by disclosing ground conditions before signing. Where a report has been provided, the builder’s reasonable foreseeability threshold rises accordingly.
Also known as: unforeseen site conditions, hidden site conditions.
Category: Contracts and commercial, Practical.
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Last updated: 2026-05-09. Verified: 2026-05-09. Quarterly review for currency.