Offcut WorksPatio and groundwork calculators
Quantities for patios, bases and paths: the slabs, the sub-base under them, and the concrete or gravel that goes with them.
- Patio calculator
Slabs, MOT Type 1 sub-base, bedding sand and cement, dig depth and fall for a paving slab patio.
- Concrete base calculator
Cubic metres, ready-mix order and bags for a slab, shed base or path, with a site-mix option.
- Gravel and aggregate calculator
Tonnes and bulk bags of gravel, MOT Type 1, sand or soil for an area and depth.
Planning a patio or base: the order to work in
- Check the rules. A hard surface of more than 5 m² in a front garden needs to be permeable or drained within the property. Next to the house, keep the surface 150 mm below the damp proof course.
- Plan the build-up. Slab, bedding and sub-base set the dig depth. The patio calculator adds them up and gives the fall.
- Order the sub-base. The gravel and aggregate calculator turns an area and depth into tonnes and bulk bags.
- Pour a base. The concrete base calculator gives cubic metres, bags or a site mix.