Garden SurveyorDriveway Calculator
Surface, sub-base and drainage-aware driveway estimator.
15 advanced inputs hidden. Switch to Advanced to fine-tune.
Site context (optional)
Helps tailor algae, weather and longevity advice.
- Area
- 15m²
- Perimeter m
- 16m
- Blocks required
- 811
- Coverage (with allowance)
- 16.2m²
- Wastage applied
- 5%
- Cuts allowance
- 3%
- Total allowance
- 8%
- Edge restraint length
- 16m
- Edging units (600 mm)
- 27
- Kiln-dried jointing sand
- 30kg
- Screed (laying) sand
- 1.2t
- Sub Base Depth mm
- 150mm
- MOT Type 1 (theoretical)
- 5.91t
- MOT Type 1 (order qty incl. 10%)
- 6.5t
- MOT bulk bags (order)
- 8
- Bedding Depth mm
- 50mm
- Excavation depth
- 222mm
- Excavation volume
- 3.33m³
- Spoil volume (bulked)
- 4.33m³
- Spoil tonnes
- 5.33t
Heads-up: Block paving lives or dies on its edge restraints — concrete-haunched kerbs or edging blocks on three sides minimum. Laid on a 30 mm sharp-sand bed over compacted MOT Type 1, with kiln-dried sand brushed and vibrated into the joints. Why it matters: For driveways use herringbone (45° or 90°) — it locks under wheel loads. Stretcher bond will rut under cars within a season.
This app provides general UK guidance and material estimates only. It is not legal, planning, engineering or building-control advice. Always confirm requirements with your local planning authority, building control, utility providers, manufacturers or qualified professionals.