Drainage Gravel | 20mm Free-Draining Stone for Drainage & Paths

£142.00

£142.00 £227.04

VAT Included

In Stock

Drainage Gravel is a practical 20mm stone for improving drainage in landscaping and building projects. It gives a stable, permeable layer that lets water through instead of pooling — ideal around drainage runs, behind retaining walls, under paths and driveways, and around the base of garden buildings. Its natural browns, greys and buffs also make it a tidy, budget-friendly top-dressing.

Product Details

Stone: Natural gravel
Colour: Brown, grey and buff
Grade: Approx 20mm down
Best for: Drainage runs, driveways, paths and around garden buildings
Pack sizes: Jumbo bulk bag (approx 1,000kg), standard bulk bag (approx 750kg), midi bulk bag (approx 500kg), or 25kg handy bags in packs of 10, 20 or 40
Coverage: Approx 10–12m² per tonne at 50mm (2in) depth
Natural stone: Shades vary between batches
Supplier: Dandy's Topsoil & Landscape Supplies

Also in the Landscaping Range

Browse more in our Building & Drainage Aggregates range, or explore the full Landscaping collection at Oak & Outdoor.

How much will I need?

Work out the volume of your area (length × width × depth in metres) and allow roughly 1.6–1.8 tonnes per cubic metre, depending on the material and how firmly it's compacted. Check the Coverage line in the product details where given, and round up rather than down so you're not left short.

How should it be laid?

Follow the Laying guidance in the product details. As a rule, sub-base and binding materials should be laid in layers on a firm, prepared base and compacted with a plate compactor, while drainage stone should be laid loose so water can pass through.

Which bag size should I choose?

Bulk bags are the most economical way to buy for larger jobs. 25kg handy bags (where offered) are ideal for smaller jobs, or if access is tight and the material needs carrying through the house or over a wall.

What if my order arrives damaged or isn't right?

Email sales@oakandoutdoor.co.uk within 48 hours with your order number and photographs. We'll liaise with Dandy's and arrange a prompt resolution.

Dandy's Topsoil is one of the UK's leading landscape and gardening suppliers, trusted for generations to provide award-winning peat-free topsoils, composts, and aggregates built to help your garden thrive. Every specialized blend is organically rich and backed by fast nationwide delivery. Be the first to leave a review at Oak & Outdoor.