How Much Does a Concrete Slab Cost?

A concrete slab does not have one cost. A ground slab poured on prepared fill is a different piece of work from a suspended slab that has to carry a storey of house above people’s heads. Treating them as the same “rate per square” is how slab prices go wrong.

KPB will not publish a rupee rate here. The rate would be false the moment thickness, steel, or access changed. This is the list of facts a slab quotation needs, so you can ask for a number that means something.

Ground slab or suspended slab

A ground-floor slab sits on compacted fill and a blinding or similar preparation. The work is excavation or fill, compaction, damp-related layers where they are specified, steel if the drawing calls for it, and concrete. A suspended slab spans between beams. It needs formwork that holds the wet concrete up, reinforcement placed to the drawing, and a supporting frame of beams and columns that is part of the same structural story.

If someone quotes “the slab” without saying which of these they mean, ask before you compare them with anyone else.

What the price is actually made of

• Area and thickness. Both change the volume of concrete. Thickness is a structural decision, not a place to shave millimetres for a discount.
• Concrete grade. The drawing or the engineer specifies it. A cheaper mix that misses the specification is not a saving.
• Reinforcement. Bar sizes, spacing, and laps come from the structural drawing. Steel is a major part of the cost and should match that drawing.
• Formwork. Suspended work is propped and boarded until the concrete can carry itself. That labour and material are easy to leave out of a casual rate.
• Beams and edges. A slab rarely exists alone. Edge beams, toilet drops, and balcony set-downs belong in the same scope.
• Access. Concrete has to arrive. A pump, a longer chute, or hand placement is a method, and methods cost money.
• Curing and striking time. Keeping the slab properly cured, and leaving props in place for the required period, is part of the work.

What to have ready before you ask

The best document is the structural drawing. If you do not have one yet, a builder can still tell you what the price depends on, but should not pretend to have quoted the engineer’s slab. At minimum, know the location, the approximate area, whether the slab is on the ground or suspended, and how a vehicle reaches the site.

In Kandy, access and slope show up here quickly. A slab on a hill plot with a narrow approach is priced with that approach included. Adding the pump on the morning of the pour is the expensive version of the same fact.

KPB builds concrete slabs in Kandy as their own scope or as part of a house. Send the drawing, or describe the floor, through the estimate form. If the wider frame is the question, the structural construction page is the better place to start.