A rear alterations-and-extension project on a sloping block in Elanora Heights. To create a level, durable platform for the new addition, we designed a suspended, voided concrete slab — using 150 mm void formers ("pods") — supported on a grid of bored concrete piers (P1) with perimeter edge beams (EB) and an internal beam (IB).
The slab ties into retaining walls (RW) along the boundary to manage the fall across the site, with a 40 mm setdown incorporated for the wet-area finishes. Once the slab was poured and cured, the extension was framed in timber, and site drainage was installed along the low side.
The result is a structurally sound, level extension that works with the site's slope rather than against it — designed, documented and certified to Australian Standards.
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