Garage Slab Adelaide — Specs, Cost & What to Ask Your Concreter

Intro — Garage slabs are deceptively technical. A vehicle-rated slab needs different specs than a shed floor.

Garage slab vs shed slab — habitable vs non-habitable; loading difference; spec difference

Garage slab specs 2026

• 100 mm concrete (passenger vehicles)
• 125 mm for dual-cab / caravan
• F72 mesh standard; F82 for heavy vehicles
• 25 MPa minimum; 32 MPa for commercial vehicles
• 100 mm DGB20 compacted roadbase

Sloped blocks (Mitcham, Blackwood, Stirling) — stepped slab design; how falls are managed

Cost guide 2026

• Single garage (3 × 6 m = 18 m²): $1,400–$2,200
• Double garage (6 × 6 m = 36 m²): $2,800–$4,300
• Triple garage (9 × 6 m = 54 m²): $4,000–$6,000

Council permit — when required; garage structures vs just the slab

Linked case study preview — Mitcham double garage sloped block (Case Study 2 from CASE-STUDIES-PLAN.md)

CTA — Free on-site measure

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