Building costs in Johannesburg
Gauteng · estimated cost per m² by building type, 2026. Pick a building type for the full breakdown and methodology.
Johannesburg sits in Gauteng, one of South Africa's highest-cost provinces on published industry estimates — a function of metro demand, concentrated labour, and material logistics. The defining local cost driver is dolomitic ground: parts of greater Gauteng are underlain by dolomite that dissolves to form sinkholes and highly variable bedrock. Engineers describe the resulting premium as a "dolomite tax" — it forces SANS 1936 stability investigations before development and can mean raft foundations, ground improvement, and heavier buried-services detailing. High water tables in places add waterproofing and basement cost. On a Johannesburg build, ground conditions are the line item most likely to surprise a budget.
Base rates from the AECOM 2025/26 cost guide (excl. VAT and fees), adjusted by province from ooba data — planning-stage figures, not quotes.