Controlled fill
Controlled fill is compacted earthworks placed under geotechnical supervision per AS 3798:2007. Required under footings to avoid Class P classification.
Ask Chalkline about this →Controlled fill is fill material placed and compacted under Level 1 geotechnical supervision per AS 3798:2007, with a Geotechnical Inspection and Testing Authority (GITA) on site and a compliance report issued at completion. Also called engineered fill or structural fill. It is the required standard for any fill that will support footings or a slab on a residential site.
Fill placed without AS 3798 Level 1 supervision, or pre-existing fill with no compliance documentation, is uncontrolled fill. Under AS 2870:2011, a site with uncontrolled fill cannot use the standard deemed-to-comply slab tables: the site classification defaults to Class P, requiring full engineering design for the foundations.
Also known as: engineered fill, structural fill
Category: Site preparation / earthworks
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Last updated: 2026-05-08. Verified: 2026-05-08. Quarterly review for currency.