Calculate exactly how much gravel you need in tonnes and bulk bags for driveways, paths and garden features. Covers all popular UK gravel types with accurate densities.
Gravel is one of the most versatile and cost-effective landscaping materials available in the UK. From decorative garden features to functional driveways, choosing the right type and calculating the correct quantity ensures your project looks professional and stays within budget. This guide covers everything you need to know about buying and using gravel in the UK.
Different gravel types have different densities, which directly affects how much weight you need to order. Here are the most popular types available from UK suppliers:
| Gravel Type | Typical Size | Density (kg/m³) | Best For |
|---|---|---|---|
| Pea Gravel | 6-10mm | 1,500 | Paths, borders, play areas |
| Golden Gravel | 10-20mm | 1,600 | Driveways, paths, decorative |
| Cotswold Chippings | 10-20mm | 1,450 | Decorative, cottage gardens |
| Slate Chippings | 20-40mm | 1,750 | Modern gardens, mulch alternative |
| Granite Chippings | 14-20mm | 1,700 | Driveways, contemporary design |
| Limestone Chippings | 10-20mm | 1,500 | Paths, traditional gardens |
| MOT Type 1 | 0-40mm | 1,800 | Sub-base, foundations |
| Shingle (beach) | 20mm | 1,550 | Coastal-style gardens |
| White Marble Chips | 10-20mm | 1,500 | Decorative borders, Mediterranean style |
| Flint Gravel | 20mm | 1,600 | Driveways, traditional, East Anglia style |
The correct depth depends on the intended use of the gravelled area. Getting the depth right is important — too shallow and the base shows through, too deep and walking becomes difficult:
Understanding how gravel is sold and delivered helps you order the most cost-effective quantity:
Bulk bags (dumpy bags): The most common delivery method for domestic projects. A standard bulk bag contains approximately 850kg of material (not a full metric tonne, despite sometimes being called a "tonne bag"). Bags are delivered on a lorry and placed on your driveway or hard standing using a crane or tail-lift. Expect to pay £50-£120 per bag depending on gravel type and supplier.
Loose loads: For larger projects, ordering a loose load (tipped from a tipper truck) is significantly cheaper per tonne. Minimum orders are typically 5-10 tonnes. This is the best option for new driveways or large garden projects.
25kg bags: Available from B&Q, Wickes and Screwfix for small projects and top-ups. Typically £3-£6 per bag (25kg), which works out to £120-£240 per tonne — much more expensive than bulk delivery. Only practical for very small areas under 2-3m².
A weed membrane (also called geotextile or landscape fabric) is essential under all gravel installations. Without it, weeds will grow through within months regardless of depth. Choose a membrane rated for the application:
When laying membrane, overlap seams by at least 150mm and pin with membrane pegs every 300-500mm. Ensure the ground below is level and clear of sharp stones that could puncture the fabric. Brands like Geotech and Weedban are widely available from Wickes and B&Q.
| Gravel Type | Price per Bulk Bag | Price per Tonne (loose) |
|---|---|---|
| Pea Gravel (10mm) | £55-£75 | £35-£55 |
| Golden Gravel (20mm) | £60-£85 | £40-£60 |
| Cotswold Chippings | £65-£95 | £45-£70 |
| Slate Chippings | £80-£120 | £60-£90 |
| Granite Chippings | £70-£100 | £50-£75 |
| MOT Type 1 | £50-£65 | £25-£40 |
Delivery charges vary between £0 and £50 depending on distance and supplier. Many UK aggregate suppliers offer free delivery on orders of 2+ bulk bags. Compare prices from Jewson, Travis Perkins, Buildbase and specialist aggregate suppliers like Decorative Aggregates and Mainland Aggregates.