Exposedaggregatevsstampedvscolouredvspolishedexternal
The 4 decorative concrete finishes available in Adelaide each have a distinct cost, look, and failure mode. This guide compares them on the dimensions that actually matter when you choose.
The comparison table
| Finish | Cost (60m²) | Look | Failure mode |
|---|---|---|---|
| Plain | $6,500-$10,500 | Workmanlike grey | Shrinkage cracks |
| Exposed aggregate | $9,500-$15,500 | Stone-front textured | Stone source variance |
| Stamped | $12,500-$19,500 | Pattern (brick or stone) | Plastic-looking colour |
| Coloured through-mix | Plain + $40-$70/m² | Uniform colour | Wear pattern |
| Polished external | $13,500-$22,000 | Soft sheen | Yellowing sealer, slip when wet |
Exposed aggregate
Works in modern and traditional Adelaide settings. Stone source variance is real; sample panels before pour are standard practice on jobs over $5,000. Detail at exposed aggregate.
Stamped
Works for traditional styles (brick, slate, stone patterns). The failure mode is plastic-looking colour from a poor colour-hardener or release agent. Pattern brand matters: Brickform, Increte, Bomanite are the industry standards.
Coloured (oxide through-mix)
The most cost-effective decorative option. Through-mix means the colour goes through the whole slab, so wear and chips stay on-tone. Detail at coloured concrete.
Polished external
The most technically demanding finish and the most expensive. The 5-stage process (grind, densify, polish, sealer, slip-rate) does not tolerate skipped stages. AS 4586 slip rating is mandatory near pools. Detail at polished concrete external.
Which finish suits which Adelaide context
- Heritage homes (inner east, North Adelaide). Stamped (slate or sandstone pattern) blends with the era.
- Modern builds (outer south, Mount Barker). Exposed aggregate or polished external.
- Pool surrounds (Glenelg, Henley Beach, Seaford). Polished external with R11 slip rating or exposed aggregate.
- Heritage-listed driveways. Stamped slate pattern, sometimes with colour-hardener to match.