Perth concrete slab prices by type
| Band | $/m² | What puts a job in this band |
|---|---|---|
| Low | $85–$105 | Garden shed slab, 100mm thick, SL72 mesh, easy access on sand ground. |
| Mid | $105–$150 | Double-garage or workshop slab, 125–150mm thick, SL82 mesh, edge beam. |
| High | $130–$200 | Engineered granny flat pad, reactive clay ground, complex forms. |
Common Perth slab sizes and total cost
- 3m × 3m garden shed (9m²) — $950–$1,400 including SL72 mesh and standard base prep.
- 6m × 3m shed (18m²) — $1,800–$2,700 for standard spec.
- 6m × 6m double garage (36m²) — $4,300–$5,400 with 125mm slab, SL82 mesh, thickened edge.
- 8m × 6m workshop (48m²) — $5,300–$7,700 with 150mm slab, SL82 mesh, thickened edge, 32 MPa mix for hoist compatibility.
- 10m × 7m granny flat pad (70m²) — $10,500–$14,000 engineered design with 150mm slab, F72 mesh, thickened edge, waffle-pod option.
Cost drivers specific to Perth slabs
- Slab thickness — every extra 25mm adds $8–$12 per m² in concrete alone.
- Mesh grade — SL82 costs roughly $6–$10 per m² more than SL72.
- Edge beam — thickened perimeter beam adds $60–$90 per linear metre of perimeter.
- Ground preparation — clay ground needs deeper prep and more compaction, adding $10–$20 per m².
- Access — pump hire adds $700–$1,200 flat; wheelbarrow-only access adds $15–$25 per m² in labour.
- Council permits — sheds over 10m² typically need a building permit through your LGA.
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