Rib and Block Slab Prices depend on the span, block type, whether you buy supply only or supplied and installed, and site access. Below are ballpark prices and what to check in a rib and block quotation.
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- Per m². Common for rafts, slabs and floors.
- Per m³. Used for concrete, excavation and fill.
- Per linear metre. Used for footings, beams, joints and edge shutters.
- Per item. Used for columns, stairs, pumps and inspections.
- Provisional sums. Allowances for unknowns such as rock. Check these closely.
Rib and Block Slab Prices at a Glance
Ballpark prices so you can sanity-check a quotation.
| Item | Ballpark price |
|---|---|
| Rib and block, supply only | R250 - R550 per m² |
| Supplied and installed, with topping | R850 - R1,300 per m² |
| Polystyrene block upgrade | R50 - R150 per m² extra |
| Typical 60 m² first floor, installed | R55,000 - R80,000 |
| Concrete topping, materials | R150 - R250 per m² |
| Engineer's inspection, per visit | R1,500 - R4,500 |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded and excluding VAT. They reflect typical South African market rates for this kind of work. They are not our prices or quotations, and no contractor is bound by them. Confirm VAT, delivery, steel, concrete and what each quotation includes.
What Drives the Price
- Ground conditions. Clay, collapsible sand, fill, rock and groundwater change the design and the digging.
- Engineering. The engineer's design sets slab thickness, beams and steel, and site visits are charged.
- Reinforcement. Steel quantity is often the biggest variable between designs.
- Concrete. Volume, strength class, pump hire and minimum load charges.
- Access. Narrow or steep sites need pumps, small machines or hand work.
- Programme and weather. Rain delays and rushed programmes add cost.
What a Quotation Usually Includes
- Setting out and excavation to the drawings.
- Formwork or edge shutters.
- DPM and sand blinding where specified.
- Reinforcement supply and fixing.
- Concrete supply, placing and finishing.
- Curing and cleaning up.
Common Exclusions
- Engineer's design, soil report and inspection fees.
- Rock excavation and dewatering.
- Imported or engineered fill.
- Concrete pump hire.
- Plumbing and drainage under the slab.
- Termite treatment, screeds, waterproofing and VAT.
Ask every contractor to price from the same drawings and list exclusions so you can compare like with like.
Rib and Block Slab Prices FAQs
What does rib and block cost per m²?
Roughly R850 to R1,300 per m² supplied and installed with topping, excluding VAT. Supply only is about R250 to R550 per m².
Does supply only include the topping?
No. Supply only covers ribs and blocks. Mesh, topping concrete, props and labour are extra.
Are polystyrene blocks more expensive?
Usually slightly, but they are lighter and insulate better.
Who pays for the engineer's inspection?
Usually the owner or builder, unless the supplier's package includes it.
Related Services
Raft Foundations South Africa is a quote-matching service. Prices on this page are indicative only. Your quotation comes from the independent contractor you choose.
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