Shed Base Estimator

Calculate concrete and ground preparation materials for a shed base or slab.

Shed base materials for a 4m by 1.2m base

For a shed base measuring 4 metres by 1.2 metres, this estimate includes concrete, hardcore and damp proof membrane allowance using the default build-up shown below.

  • Base area4.80 m²
  • Concrete0.53 m³
  • Hardcore1.06 tonnes
  • DPM allowance5.28 m²

Results - Shed Base Estimator

  • Base area4.80 m²
  • Concrete0.53 m³
  • Hardcore1.06 tonnes
  • DPM allowance5.28 m²

How this shed base estimator works

It calculates the slab area, concrete volume, sub-base volume and a practical DPM allowance for common shed and outbuilding bases.

Popular sizes

Popular pre-filled calculator pages.

2m × 1.2m
Shed Base Estimator
2.4m × 1.2m
Shed Base Estimator
2m × 1.8m
Shed Base Estimator
3m × 1.2m
Shed Base Estimator
2m × 2m
Shed Base Estimator
2.4m × 1.8m
Shed Base Estimator
3.6m × 1.2m
Shed Base Estimator
2.4m × 2m
Shed Base Estimator
4m × 1.2m
Shed Base Estimator
3m × 1.8m
Shed Base Estimator
2.4m × 2.4m
Shed Base Estimator
4.8m × 1.2m
Shed Base Estimator

Pre-filled calculator pages help visitors jump straight to a useful estimate and then refine the result if needed.

Disclaimer

Material quantities shown are estimates for guidance only. Although typical UK wastage and compaction allowances have been included, actual requirements may vary depending on site conditions, installation methods, and material differences. Please confirm quantities with your installer or supplier before ordering. We accept no liability for inaccuracies, financial loss, or delays arising from the use of these estimates.