Construction Waste Cost Calculator
Work out how many skips a renovation or demolition needs once the waste bulks up, and the total disposal cost including permits for each container.
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Waste disposal is consistently under-budgeted because demolished material occupies far more space than it did in the building. Broken plaster, brick and timber bulk up by roughly half again, so the volume removed from a room is not the volume that came out of it.
Skips are also charged per container regardless of how full they are, so the count matters more than the exact volume.
The calculation
Volume after bulking = material volume × the bulking factor, because demolished material does not repack as tightly as it was built. Divide by skip capacity and round up, since a part-full skip costs the same as a full one, then add any permit per skip.
Worked example
Twelve cubic metres of material with a 1.5 bulking factor becomes 18. At a 6 cubic metre skip capacity that is three skips, and at 280 plus a 60 permit each, the disposal costs 1,020.
Separate the waste and pay less
Clean, segregated material — inert rubble, metal, timber — is frequently cheaper to dispose of than mixed waste, and metal can have value. Where there is room for two containers, segregation usually pays for the extra hire.
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Create your free property pageFrequently asked questions
What is a bulking factor?
The ratio between the volume of material after demolition and the volume it occupied in the building. Broken masonry and plaster typically bulk by 40 to 60 percent, and light material such as insulation considerably more.
Is a skip or a grab lorry better?
Grab lorries suit large volumes of inert material and are usually cheaper per cubic metre, but they need road access and load in one visit. Skips suit gradual clearance and mixed waste over a longer period.
Do I need a permit for a skip?
Wherever it stands on a public road or pavement, almost always, and it is normally time-limited. On private land within your own boundary, usually not — but check locally, since the definitions vary.
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