Why Gravel Deserves a Place in Your Garden

A gravel path is one of the most rewarding jobs you can take on in a UK garden. It is forgiving, relatively cheap, quick to lay, and it drains away the sort of persistent drizzle that turns other surfaces into a slippery mess. It also softens the edges of a planting scheme beautifully, catching light and crunching pleasantly underfoot.

It is not, however, a case of tipping a few bags on the soil and raking them flat. Do that and within a season you will have weeds pushing through, gravel migrating into the borders, and a sunken, rutted track where you wanted a path. The difference between a path that lasts fifteen years and one that lasts fifteen minutes comes down to three things: a properly prepared sub-base, a solid edge, and thorough compaction. Get those right and the rest is straightforward.

Choosing the Right Gravel and Working Out How Much You Need

For a garden path, look for angular gravel rather than rounded pea shingle. Angular stones knit together underfoot and stay put, particularly on gentle slopes. A 10mm or 14mm size is comfortable to walk on and easy to rake; 20mm is more robust and better for driveways or heavy traffic.

Standard decorative gravel is laid at around 40mm deep once compacted. As a rough guide, one bulk bag (roughly 850kg) covers about 10 to 12 square metres at that depth. If you are ordering loose, a tonne will do a little more. It is worth ordering a spare bag or two for topping up later.

• Sub-base: MOT Type 1 or a similar crushed stone, laid 75–100mm deep and compacted.
• Membrane: a woven geotextile, not the thin black polythene sold as weed fabric.
• Gravel: angular, 10–20mm, enough for a 40mm finished layer.
• Edging: block pavers, treated timber, or steel edging with pins.

Setting Out the Route and Digging the Trench

Mark the path with pegs and a taut line, then check the levels. A path should fall gently away from the house at roughly 1:60 to 1:80 so water runs off rather than pooling. If your path runs towards a building, add a small drainage channel or gravel-filled soakaway at the end.

Excavate to a depth of around 150mm for a pedestrian path: 100mm for the sub-base, 40mm for the gravel, and a little spare for settlement. Cut the edges neatly with a sharp spade and keep the trench sides vertical — a sloped edge lets the sub-base spread and the path will creep outwards over time. Keep the spoil on a tarpaulin; it saves a lot of tidying later.

Building a Sub-Base That Will Not Move

This is the stage most people rush, and it is the one that matters most. Fill the trench with MOT Type 1 in two layers, compacting each one thoroughly with a plate compactor or a heavy hand tamper. Watering each layer lightly helps the fines bind together.

Once compacted, the sub-base should feel like a firm, slightly rough road surface — you should not be able to push a finger into it. Check your falls as you go using a straight timber and a spirit level. The finished sub-base should sit about 50mm below your intended path level.

Lay the woven membrane over the sub-base, overlapping joins by at least 100mm. This stops weed seeds germinating from below and, crucially, prevents the gravel from sinking into the sub-base over the years.

Installing a Sturdy Edge

An edge is what turns a heap of stones into a path. Without one, gravel spills into the lawn and borders, the edges crumble, and you will be sweeping stones off the patio for years.

Block pavers set on a 100mm bed of concrete, with a haunch of concrete on the outer side, make the most hard-wearing edge and look smart alongside brick or stone. Treated timber is cheaper and quicker: use 100mm by 50mm tanalised timber, bed it on compacted Type 1, and pin it with 300mm pegs driven through pre-drilled holes. Steel or aluminium edging is the neatest option for curved paths — it flexes to the shape and holds firm on pins, sitting almost flush with the gravel.

Whichever you choose, set the top of the edging 10mm above the finished gravel level. That small lip keeps the stones in place and gives you a crisp line to rake against.

Laying and Compacting the Gravel

Tip the gravel in small piles along the path rather than one enormous heap at the end — it is far less work to move. Rake it out to an even 40mm layer, working backwards so you are not walking on finished ground.

Now compact it. A plate compactor with a rubber mat, or a water-filled roller for larger paths, will settle the stones into each other and give a firm, stable surface. For short paths, a hand tamper and plenty of patience will do. Top up any low spots after compacting and give them a second pass.

Finish by raking the surface lightly in one direction for a tidy appearance, and check that the gravel sits just below your edging.

Keeping Your New Path Looking Sharp

A well-built gravel path needs very little attention. Rake it once or twice a year to redistribute stones and pull out any moss or fallen leaves, which are the main cause of weed growth. Hand-weed promptly rather than reaching for a pressure washer, which blasts the fines out of the gravel and leaves it loose and unstable.

Expect to top up the surface every few years, particularly on well-trodden sections. Order a matching gravel so the colours blend, and add it in thin layers rather than one thick dump. Treated this way, a gravel path becomes one of the quiet, hard-working features of a garden — softening the planting, handling the weather, and lasting far longer than most people expect.