How do I estimate demolition waste volume?

Multiply the room length by width by height to get the gross volume in cubic metres. Then apply a fill percentage — typically 60-80% for a full strip-out and 20-40% for selective demolition. The calculator converts volume to weight using material density factors per WRAP guidelines.

What density should I use for mixed demolition waste?

Mixed demolition waste typically has a density of around 1.5 tonnes per cubic metre. Pure brick and masonry is around 1.8 t/m³, concrete is 2.4 t/m³, and timber is much lighter at 0.6 t/m³. These figures are based on WRAP (Waste & Resources Action Programme) data for UK construction waste.

How many skips do I need for a house demolition?

A typical 3-bed semi-detached house generates 30-50 tonnes of demolition waste. Using 8-yard builder skips (4 tonnes each), you would need 8-13 skips. A grab lorry is often more economical for larger demolitions, carrying around 8 tonnes per load.

What percentage of demolition waste can be recycled in the UK?

The UK achieves around 90% recycling rates for non-hazardous construction and demolition waste, one of the highest in Europe. Concrete and brick can be crushed for aggregate, timber can be chipped, and metals are highly recyclable. Plasterboard must be recycled separately due to gypsum content.

Is a grab lorry cheaper than skips for demolition waste?

For larger quantities (over 8 tonnes), a grab lorry is usually more cost-effective than multiple skips. A grab lorry can collect 8-10 tonnes in one visit and does not need a skip permit. However, the lorry needs clear access within reach of its hydraulic arm (typically 6m reach).

Demolition Waste Calculator — Free Demolition & Strip-Out Tool

How We Calculate This

This calculator estimates demolition waste quantities from room dimensions and material types. It uses industry-standard density conversion factors to convert volume (m³) to weight (tonnes) for accurate disposal planning.

Calculation method

Step 1: Calculate gross volume from room dimensions (length x width x height) multiplied by the number of rooms.

Step 2: Apply the fill percentage to account for actual waste volume versus empty room volume.

Step 3: Convert volume to weight using material density factors from WRAP guidelines (e.g. brick/masonry = 1.8 t/m³, concrete = 2.4 t/m³).

Step 4: Calculate the number of skips or grab lorry loads needed, checking both volume and weight limits to determine the constraining factor.

UK regulations

All demolition waste in England must comply with the Waste Duty of Care regulations. Site Waste Management Plans (SWMPs) are best practice. Waste must be transported by licensed carriers and disposed of at permitted facilities. Skips on the public highway require a council permit.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.