Paving Cost Calculator (m² & Slab Count)
Estimate cost by area (per m²) or per slab. For per-slab pricing, enter slab area or a square slab edge length.
Paving Cost Calculator Guide (Slabs, Area & Waste)
This guide explains how the Paving Cost Calculator works when you price by m² or by slab, how to convert slab sizes (cm/mm/in) into area, and how to account for waste, edging and extras. Use it for patios, paths and driveways.
Affiliate Tools & Materials
- Rubber mallet & spacers- travis Perkins
- Diamond blade (porcelain rated)- Travis Perkins
- Hire Hire Abrasive Saw 300mm - Travis Perkins
- Jointing compound-Travis Perkins
- Bedding sand & cement
- MOT Type 1 Sub Base Bulk Bag
- Geotextile membrane
Disclosure: Some links may earn SmartBuildCalc a small commission at no extra cost to you.
How the Calculator Works
Tip: Keep waste between 5–10% for simple layouts. Go higher for curves, random packs, or tight cuts around manholes and drains.
Common Square Slab Sizes & Areas
| Nominal Size | Edge (mm) | Area (m²) | Pieces per 10 m² (no waste) |
|---|---|---|---|
| 450 × 450 | 450 | 0.2025 | ≈ 49 |
| 600 × 600 | 600 | 0.36 | ≈ 28 |
| 450 × 600 (rect) | 450×600 | 0.27 | ≈ 38 |
| 900 × 600 | 900×600 | 0.54 | ≈ 19 |
Typical UK Costs (2025)
| Item | Typical Range (ex. VAT) | Notes |
|---|---|---|
| Porcelain / concrete pavers | £20 – £55 per m² | Budget concrete at lower end; branded porcelain higher. |
| Natural stone pavers | £28 – £70 per m² | Sandstone/limestone; premium calibrated/sawn at top end. |
| Jointing compound / mortar | £2 – £6 per m² | Depends on joint width/depth and product. |
| Bedding sand / mortar bed | £5 – £12 per m² | Single-size to full mortar bed depending on method. |
| Edging stones | £10 – £25 per LM | Material only; install adds labour. |
| Geotextile membrane | £1.5 – £3 per m² | Under sub-base; reduces fines migration. |
| Labour (laying slabs) | £25 – £50 per m² | Complex patterns/porcelain at higher end. |
| Waste removal | £150 – £400 per skip | Or £180 – £420 per 8-wheel grab load. |
Regional note: London & South East can be +10–20%. North/Wales/Scotland often −5–10%.
Time & Labour Planning
| Crew / Conditions | Production | Notes |
|---|---|---|
| 2-person crew, simple rectangle | 12–20 m² / day | Full mortar bed, cuts minimal, stock close by. |
| 3-person crew, complex layout | 15–25 m² / day | Patterned/porcelain with frequent cuts. |
| Edging install | 10–25 LM / day | Trench, concrete haunching, levels & line. |
Example Calculations
1) Per m² Pricing
Patio 6.0 × 4.0 m, waste 8%, rate £35/m².
2) Per slab Pricing (600 × 600)
Same patio, waste 8%, price £8 per slab, square 600 mm.
Checklist Before You Order
- Confirm falls and finished floor level at thresholds.
- Pick laying method (full bed mortar vs sand bed + jointing compound).
- Include waste % suitable for layout and slab type.
- Add allowances for edging, drainage channels, manhole covers.
- Plan waste removal (skip or grab) and access routes.
Related Calculators
Frequently Asked Questions
What waste percentage should I use?
Most square/rectangular patios work with 5–10%. Use 10–15% for curves, random patterns or porcelain with lots of cutting.
How do I price per slab if I only know the edge size?
Convert edge to metres and square it. Example: 600 mm = 0.6 m → 0.6 × 0.6 = 0.36 m² per slab.
Can I mix per-slab and per-m² prices?
Yes. The calculator outputs both totals and unit rates so you can compare suppliers quoting differently.
How many slabs do I need?
Slab count = ceil( area (incl. waste) ÷ slab area ). Round up to avoid shortages.
Does this include sub-base and labour?
This guide is for surface paving costs. Use the Sub-Base and Paving Bed calculators to complete your full estimate and add labour.
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Meta Title (suggested): Paving Cost Calculator UK (2025) — Price by m² or Per Slab
Meta Description (suggested): Free Paving Cost Calculator — estimate patio price by m² or per slab, convert slab sizes, add waste, and compare totals. Includes UK cost ranges and examples.
