Black Basalt Gravel 20mm Bulk Bag

From £99.75 inc. VAT

Quantity: 1000kg (1 tonne) bulk bag.

Coverage: 1000kg of 20mm black gravel stones will typically cover 12m2 (12m x 1m) at a depth of 50mm.

Consists of: 10mm – 20mm black basalt gravel.

Usage: Black basalt gravel is ideal for paths, driveways, borders, rockeries, and water features. Suitable for use in and around ponds as substrate or dressing due to being fish safe once washed to remove any contaminants.

(10 customer reviews)


1 - 4£105.00
5 - 9£102.38
Black Basalt Gravel 20mm Bulk Bag From £99.75 inc. VAT

Our 20mm black basalt gravel – sometimes referred to as black granite gravel – provides a stunning contrast to garden planting, green lawns and a variety of architectural styles. A dynamic aggregate that’s a neutral dark grey when dry before turning a shiny black when wet, black garden gravel has many uses and will transform your outdoor space. Regularly used on driveways, our black driveway gravel has proven itself as a stable and robust surface due to the angular black gravel stones that closely interlock. This also ensures stability underfoot unlike some larger aggregates that can be uncomfortable to walk on. Black basalt gravel 20mm is a truly versatile product that can even be used as a topping material on flowerbeds, borders and pots due to its inert nature. This also makes it safe for fish when used as a substrate or dressing material in and around water features – just ensure that the gravel is thoroughly washed to remove any contaminants prior to being laid.

20mm black gravel is a natural product that appears dark grey when dry and may vary in colour and size. Our bulk bags consist of stones 10mm – 20mm in size due to the mechanical screening process used.

Key features

  • Dark grey when dry, shiny deep black when wet which makes for a stunning contrast to garden planting and green lawns.
  • Neutral grey/black colour is versatile and can be paired with a variety of architectural styles, from traditional to ultra modern buildings that benefit from a clean finish.
  • A hard-wearing aggregate that’s suited to use on driveways and busy paths.
  • Angular stones that interlock readily and are stable underfoot.
  • Excellent drainage properties.
  • Can suppress weeds effectively by preventing light from reaching the sub-base below.
  • Our black basalt stones are inert and therefore safe for fish and can be used as a flowerbed or plant topping material.
  • Environmentally friendly and sustainable.
  • Contact us if you require loose load delivery.

Additional information

Weight 1000 kg
Aggregate type

Black basalt gravel

Bag size

1000kg (1 tonne) bulk bag



Please note: Many of the products we sell are natural materials and as such, our photographs are intended for illustrative purposes only, with variations in shape, size and colour possible.

10 reviews for Black Basalt Gravel 20mm Bulk Bag

  1. John Jackson

    Location: Blackpool

    I like it black when wet can’t fault this product. Fantastic product and very helpful staff 5*****

  2. Russell murray

    Location: Bacup

    Black basalt, looks classy. Delivered on time by a helpful chap who put the tonne bags just where we needed them

  3. Abu

    Location: Fulwood, Preston

    Lovely Product Even Better When Wet Brilliant Service Kept Updated Up To Delivery Very Friendly Delivery Driver More Than Helpful And Only Place I Found That Actually Gives You A Full Ton And Cheapest To Faultless Service Nothing To Hard For This Firm All The Reviews Proved This For Me

  4. Brian

    Location: Burnley

    It’s dark, but not black. On delivery it looks pale, but after rain has washed off the dust it’s almost black. Looks best when wet.

  5. gene clifford

    Location: poulton le fylde

    just the job. Basalt chippings good match with existing chippings from elsewhere several years ago. Good price too compared to some other sources.

  6. Colin Digby

    Location: Baxenden

    Stone absolutely spot on

  7. Gregg Norris

    Location: Poulton Le Fylde

    Looks fantastic we had to order some more to finish off when delivered it was a different shade. Driver asked us if we wanted to keep it or if it was to go with stones already down he would take it back and re deliver from the quarry ours was from. Can’t rate company high enough!

  8. Steve Galbraith

    Location: Aughton

    Looks great dry, looks even better wet. Fast and Efficient delivery as always.

  9. John Simms

    Location: Bolton

    Amazing Black Stone….Excellent company. Friendly when ordering over the phone and delivery driver extremely helpful. 5 stars!

  10. David Briggs

    Location: Rawtenstall

    Gravel is perfect for what we needed but its the service that impressed me most and the driver who helped make life easy for us by driving down a lane he had to back up out of so that we didn’t have to barrow the gravel. Wouldn’t hesitate to recommend and will use again definately.

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