Block Paving Calculator
Calculate blocks, sand, and sub-base materials needed for your driveway or patio project with our comprehensive block paving calculator
Project Specifications
Block Paving Materials Guide
Standard Block Sizes and Coverage
| Block Size | Blocks per m² | Coverage per Pack | Best For |
|---|---|---|---|
| 200mm x 100mm | 50 blocks | 9.76m² (488 blocks) | Driveways, standard patios |
| 150mm x 100mm | 67 blocks | Variable | Decorative areas |
| 100mm x 100mm | 100 blocks | Variable | Pathways, small areas |
| 225mm x 112mm | 40 blocks | Variable | Large commercial areas |
Foundation Requirements
- Sub-base: 100-150mm of MOT Type 1 aggregate for driveways
- Sharp sand: 40mm compacted bedding layer
- Blocks: 50-80mm thickness depending on traffic load
- Jointing sand: Fine kiln-dried sand for joint filling
- Edge restraints: Concrete or metal edging for stability
Popular Laying Patterns
Most stable for driveways, requires 10% extra blocks for cutting
Simple pattern with minimal waste, 5% extra recommended
Decorative square pattern, 8% extra for complex cuts
Modern grid pattern, minimal waste at 3% extra
Installation Process
Step-by-Step Installation
- Planning and Marking: Mark out the area with spray paint or pegs and string
- Excavation: Dig to required depth (typically 200-250mm total)
- Sub-base Installation: Lay and compact MOT Type 1 aggregate in 75mm lifts
- Edge Restraints: Install concrete or metal edging around perimeter
- Sand Bedding: Screed 40mm of sharp sand to create level surface
- Block Laying: Start from straight edge, work across in chosen pattern
- Cutting: Cut edge blocks with angle grinder or block splitter
- Compaction: Vibrate blocks with plate compactor
- Jointing: Sweep kiln-dried sand into joints and compact again
- Final Clean: Remove excess sand and inspect finished surface
Essential Tools Required
- Mechanical excavator or spade for digging
- Plate compactor (minimum 200kg)
- Angle grinder with diamond blade
- Rubber mallet for block adjustment
- Spirit level and string line
- Screed rails and screed board
- Wheelbarrow and shovel
- Safety equipment (goggles, gloves, dust mask)
Cost Considerations
Typical UK Block Paving Costs (2025)
| Component | Cost per m² | Notes |
|---|---|---|
| Concrete blocks | £15-£25 | Standard rectangular blocks |
| Clay pavers | £25-£45 | Higher quality, better colour retention |
| Sub-base materials | £8-£12 | MOT Type 1 aggregate |
| Sand and sundries | £5-£8 | Sharp sand, jointing sand, edge restraints |
| Professional installation | £40-£80 | Labour costs vary by region |
Important Considerations
- Always add 10-15% extra materials for wastage and future repairs
- Check with local council for planning permission requirements
- Consider drainage requirements and falls away from buildings
- Ensure utilities are marked before excavation begins
- Quality of sub-base preparation is crucial for long-term durability
Frequently Asked Questions
How many blocks do I need per square metre?
For standard 200mm x 100mm blocks, you need 50 blocks per square metre. This is the most common size used in UK driveways and provides good structural stability.
What depth of sub-base do I need?
For pedestrian areas, 75-100mm is sufficient. Residential driveways require 100-150mm, whilst commercial areas need 150-200mm of compacted sub-base material.
Can I lay blocks directly on soil?
No, proper foundation layers are essential. Blocks laid directly on soil will sink, shift, and crack over time. Always install proper sub-base and sand bedding layers.
How long does block paving last?
Well-installed block paving can last 20-25 years or more. The key factors are proper foundation preparation, quality materials, and regular maintenance including joint sand replenishment.
What maintenance is required?
Annual maintenance includes cleaning, weed removal, joint sand top-up, and occasional re-sanding. Pressure washing should be done carefully to avoid displacing joint sand.
Do I need planning permission?
For driveways, planning permission may be required if the area exceeds 5m² and doesn’t drain to a permeable surface. Always check with your local planning authority.