Pebble and Gravel Landscaping Ideas for Australian Homes

Stone is the cheapest way to cover ground that nothing wants to grow on, and the most commonly botched. Most of the advice you will find online is written for American or British conditions, in inches, using product names no Australian supplier stocks. The result is people ordering the wrong size, laying the wrong thing underneath, and spending a weekend fixing it two years later.

This guide is written for Sydney and Australian conditions. What the stone is actually called here, how much you need, what goes underneath, and the one planning rule that catches people out.

Quick answer:

Pick stone by behaviour, not looks. Angular stone such as deco granite locks together when compacted and suits paths. Rounded river pebble rolls and migrates, so it suits planting beds where nobody walks. Lay it at 40 mm to 50 mm for beds and 50 mm to 75 mm over a compacted base for paths. Skip weed mat in planting beds, because debris collects on top of it and weeds root through within a few years; use non-woven geotextile only under paths and driveways, where it is a structural separation layer. One 20 kg bag covers about 0.25 m² at 50 mm, so budget roughly four bags per square metre, and order bulk by the tonne for anything over about 5 m².

Key takeaways

• One 20 kg bag covers about 0.25 m² at 50 mm deep, so you need roughly four bags per square metre, or just under a tonne per 13 m².
• Bagged stone costs two to seven times bulk stone. Over about 5 m², order by the tonne.
• Weed mat under stone in a planting bed fails within a few years, because weeds germinate in the debris that collects on top of it.
• Geotextile under a path or driveway is a different product doing a structural job, and it is worth using there.
• Angular stone such as deco granite locks together and suits paths. Rounded river pebble rolls and suits beds.
• Stone almost never counts as landscaped area under council controls, so gravelling a whole front yard can breach the DCP.
• Expect $45 to $150 per tonne delivered in Sydney for common stone, which works out around $5 to $15 per square metre at 50 mm.

What the stone is actually called in Australia

Start here, because the terminology gap is the reason so much of this goes wrong. Overseas guides talk about pea gravel and quarter-inch crushed stone. Walk into a Sydney landscape yard and ask for either and you will get a blank look. Here everything is graded in millimetres and sold by common name.

Two properties decide almost everything about how stone behaves. The first is size. The second is whether it is angular or rounded.

Angular stone, such as deco granite or crushed sandstone, has broken faces that key into each other. Compact it and it stays put, which is why it is the only loose material that makes a decent path. Rounded stone, such as river pebble, has no faces to lock. It rolls underfoot, migrates downhill and spreads out of beds onto paving. That makes it excellent as a visual surface and poor as a walking one.

The size that catches people out:  anything above about 20 mm is uncomfortable to walk on barefoot, awkward in thongs, and close to impossible to push a barrow or pram across. Keep the big stone for places people only look at.

How much do you need? The maths nobody publishes

This is the question people actually search, and most pages dodge it. The arithmetic is simple once you have the density. Pebble and gravel run at roughly 1.5 tonnes per cubic metre, so a 20 kg bag is about 0.013 cubic metres of material.

The short answers

• One 20 kg bag covers about 0.25 m² at 50 mm deep. At 30 mm it stretches to about 0.45 m².
• One tonne covers about 13 m² at 50 mm, 17 m² at 40 mm, or 22 m² at 30 mm.
• Work out your area in square metres, multiply by your depth in metres, then multiply by 1.5 to get tonnes. A 20 m² bed at 50 mm is 20 x 0.05 x 1.5, which is 1.5 tonnes.

Buy in bulk once you pass about five square metres

Sydney yards sell the same stone two ways and the gap is stark. Bulk delivered stone runs roughly $45 to $150 per tonne depending on the product. The identical stone in 20 kg bags works out between $445 and $750 per tonne once you do the sum. On a 20 m² bed that is the difference between about $150 and about $1,100.

Bags still make sense for small areas, for topping up, or where a truck genuinely cannot reach. Past about five square metres, order a bulk bag or a tipper load and barrow it in.

Check access before you order.  A tipper needs clear space to tip and a reasonably level spot. If the only option is a verge drop, you are responsible for clearing it promptly and for any damage to the nature strip. On tight blocks a one-tonne bulk bag craned or hand-barrowed is often the sensible compromise.

What goes underneath, and why the usual advice is wrong

Every overseas guide gives the same instruction. Lay heavy-duty weed fabric, then spread your stone. It sounds sensible. In a planting bed it is close to the worst thing you can do.

Why weed mat fails under pebbles

The fabric does stop weeds coming up from below, and for a year or two it works. Then physics takes over. Dust, leaf litter, broken-down stone and general grime wash into the gaps between the pebbles and settle on top of the fabric. Within a few years that debris has become a thin layer of soil sitting above the barrier. Seeds land in it, germinate in it, and root down through the weave.

At that point you are worse off than if you had laid nothing. The weeds are anchored into the fabric rather than into loose soil, so they tear rather than pull. The mat has also been blocking water and air exchange and starving soil biology the whole time, and it makes planting anything new a matter of cutting holes in a shredding sheet under a tonne of stone.

Perennial runners defeat it anyway. Kikuyu, couch and nutgrass all travel sideways and come up at the edges or straight through.

What to do instead in a planting bed

1. Kill the perennial weeds first. Not a quick pull. Runners such as kikuyu and nutgrass need removing properly or treating before anything goes over them, because no barrier stops them.
2. Grade and firm the soil. Get the levels right while you can still see them, and make sure water drains away from walls and paving.
3. Lay the stone straight onto open soil at 40 mm to 50 mm. Thinner than that and weeds push through and the soil shows. Much thicker and it starts restricting gas exchange over root zones.
4. Install a proper edge. Steel, aluminium or masonry. Without one the stone migrates into the turf and across the paving within a season.
5. Expect to spot-weed occasionally. A few minutes a couple of times a year is less work than lifting a failed mat out from under a tonne of stone.

Where geotextile does belong

Under a path, courtyard or driveway, a non-woven geotextile is doing something completely different. It separates the stone from the compacted base so the two do not grind into each other and so the stone does not punch down into the subgrade. That is a structural job. Any weed suppression is incidental.

The build-up for a trafficked surface matters more than the stone on top of it. Without a compacted roadbase layer the stone works its way into the clay, you lose depth every year, and the surface turns to a rutted mess after rain. Getting the base and the falls right is proper excavation and groundwork, not something to improvise.

Six ways to use stone that go beyond filling a bed

1. Dry creek bed

The best of them, because it earns its place. A shallow swale lined with mixed 40 mm to 70 mm stone, with larger anchor stones set into the line, takes roof and surface runoff somewhere useful instead of letting it sheet across the paving. On Sydney’s clay blocks, where water tends to pond, this solves a drainage problem and reads as a feature at the same time. Set it on a genuine fall and finish it into a pit or a planted soak, not into the neighbour’s fence line.

2. Stepping stones set into pebble

Large format pavers carrying the footfall, with stone filling between them. You get the look of a stone field without the problem of walking on loose material. Space the pavers at a natural stride, around 600 mm centre to centre, and set them flush so nobody catches a toe.

3. Stone as mulch in planting beds

40 mm to 50 mm over open soil. It holds moisture, keeps soil off render and fences, and does not need replacing every year the way bark does. The trade-off is that it adds no organic matter to the soil, so beds under stone need feeding rather than relying on mulch breaking down. Use it around established structural planting rather than around things you will be lifting and dividing.

4. A strip along the house

300 mm to 400 mm of stone against the wall line. It stops rain splashing soil up onto render, keeps bed soil away from the damp proof course, and gives you a clean line to run along. Unglamorous, and one of the few stone details that pays for itself in reduced wall cleaning.

5. A compacted courtyard floor

Deco granite or crushed sandstone, compacted, with a firm edge. Per square metre it is the cheapest usable outdoor surface you can build, it drains, and it suits an informal or heritage setting. It is not as firm as paving, so consider who is using it. Prams, wheelchairs and walking frames all struggle on loose surfaces, and even compacted fines are harder going than a paved area. We compare the broader options in soft versus hard landscaping and in our guide to patio paving ideas.

6. Stone field with pots over it

A clean stone surface with planted pots arranged on it. The planting stays movable, the surface stays clear, and you can change the whole look by moving three pots. It suits small courtyards and rental properties, and it works well where soil depth is limited over a slab.

Stone also sits naturally with water. A pebble surround to a pond or a bowl is the standard detail, covered in our guide to water feature ideas.

The planning trap: stone is not landscaped area

This is the part no other article on the subject mentions, and it is the one with real consequences. People gravel an entire front yard to cut down the work, then discover they have breached a council control.

Most NSW councils use the standard definition. Camden Council’s development control plan puts it plainly. Landscaped area means a part of a site used for growing plants, grasses and trees, and it does not include any building, structure or hard paved area. Stone is a hard surface. It does not count.

Camden then requires a minimum of 30 per cent of the site to be landscaped, at least 40 per cent of the front setback to be landscaped, and excludes any strip narrower than 1.5 metres from the calculation. Artificial turf does not count either. Other Sydney councils use similar numbers with local variations.

How to use stone without falling foul of it:  treat stone as mulch within planting beds rather than as a replacement for them. A bed of stone with structural planting through it still reads as planting on a site plan and still performs. A wall-to-wall stone yard does not.

There is a separate point about permeability. Stone laid loose on open soil does let water through. Stone laid over a fabric and a compacted base largely does not, and some councils count that as an impervious surface for stormwater purposes. If permeability is the goal, our guide to permeable paving covers the systems that are designed for it.

Where stone is the wrong answer

• Large expanses in full western sun. Stone absorbs and re-radiates heat. A big field of dark stone against a west wall makes the room behind it noticeably hotter through a Sydney summer afternoon, and light quartz throws glare back at the windows.
• Under deciduous trees. Leaf fall into stone is a genuine chore. It cannot be raked out cleanly and a blower just drives it deeper.
• Anywhere a pram, wheelchair or walking frame needs to go. Loose material at the depth needed to look right is the depth that makes wheels sink.
• On slopes steeper than about one in ten. Rounded stone migrates downhill with every storm. Use angular stone, deeper edging and check dams, or choose something else.
• Where pets dig or children play. Stone gets thrown, and 20 mm pebble through a window costs more than the stone did.
• Over the root zone of established trees. A thin decorative layer is fine. A deep stone bed over tree roots restricts gas exchange and compacts the surface.

Keeping it looking right

Stone is low input rather than no input. Three things keep it tidy.

• Top up every few years. Stone sinks into soil and gets carried away on shoes. A 20 mm to 30 mm top-up every three to five years restores the depth and the colour.
• Blow or rake out organic debris. This is the single most useful thing you can do, because debris is what weeds germinate in. Clearing it each autumn roughly halves the weeding.
• Wash light-coloured stone. White quartz and crushed sandstone pick up dirt and algae in shaded spots. A stiff broom and a hose restores most of it, and the same care that keeps paving looking good applies here.

What it costs in Sydney

Labour is the larger share on anything that needs a base. A decorative bed is mostly material cost; a compacted path is mostly excavation and base. Access drives both. For a wider view of outdoor project pricing, see our Sydney landscaping cost guide.

Common mistakes

1. Laying weed mat in a planting bed. Covered above, and worth repeating because it is the single most common error on this topic.
2. Going too shallow. Under 30 mm the soil shows through and weeds come straight up. Stone laid thin always looks like it was laid thin.
3. Skipping the edge. Without a hard edge, stone ends up in the turf, across the paving and in the gutter. It is the cheapest part of the job and the one most often left out.
4. Buying bagged for a large area. Several times the cost of the same stone in bulk.
5. Choosing rounded stone for a path. It rolls, it migrates, and it is uncomfortable. Angular compactable fines are the right product there.
6. Gravelling the whole front yard. Both a planning problem and a heat problem, and it rarely looks as good as the photo that inspired it.

Getting it done

Stone work is simple to describe and physical to execute. A 20 m² bed is a tonne and a half of material moved by barrow, and a compacted path means excavation, base, compaction and edging before any stone is spread.

Living Green Outdoors builds stone beds, dry creek beds, compacted paths and courtyards across Sydney as part of broader landscaping projects. If you are weighing stone against turf or paving for a particular area, get in touch and we will look at the aspect, the falls and the use before recommending one.

For more ideas on where stone fits in a wider scheme, see our backyard landscaping ideas, front yard landscaping ideas and our guide to backyard zoning.

Frequently asked questions

What do you put down before laying pebbles?

It depends on what the area is for. In a planting bed, lay the stone straight onto clean, weeded, graded soil with no fabric, because weed mat under pebbles fails within a few years once debris collects on top of it and weeds root through. Under a path, courtyard or driveway, use a non-woven geotextile over a compacted roadbase. There the fabric is a separation layer stopping the stone punching into the base, which is a structural job rather than a weed control one. In both cases, remove perennial runners such as kikuyu and nutgrass first and install a hard edge.

What are some ways to landscape with pebble rocks?

The most useful applications are a dry creek bed that takes surface runoff, stepping stones set into a pebble field so you are not walking on loose stone, pebble used as mulch in planting beds at 40 mm to 50 mm, a 300 mm to 400 mm strip along the house to stop splash-back onto render, a compacted deco granite courtyard floor, and a stone field with planted pots arranged over it. Pebble also makes the standard surround for a pond or water bowl.

How much will a 20kg bag of pebbles cover?

About 0.25 square metres at 50 mm deep, which is the usual decorative depth. At 40 mm it covers around 0.33 square metres and at 30 mm around 0.45 square metres. Put the other way around, you need roughly four 20 kg bags per square metre at 50 mm. The calculation assumes a bulk density of about 1.5 tonnes per cubic metre, which is typical for pebble and gravel. For anything over about five square metres, bulk stone by the tonne is two to seven times cheaper than the same product in bags.

Can I put pebbles directly on soil?

Yes, and in planting beds that is the better option. Lay them at 40 mm to 50 mm over clean, weeded, graded soil. Water, air and soil life keep moving, and you can still plant into the bed later. The two things to do first are removing perennial weeds, which no barrier stops anyway, and installing a hard edge so the stone does not migrate. On a trafficked surface it is different. There the stone needs a compacted roadbase underneath or it will work its way into the soil and you will lose depth every year.

How deep should pebbles and gravel be?

40 mm to 50 mm for decorative beds and borders, which is deep enough to hide the soil and suppress most germination. 30 mm is enough for a top-up over an existing layer. 50 mm to 75 mm for paths and areas that take foot traffic, over a compacted base. Going much deeper than 50 mm over the root zone of established plants is not recommended, because it starts restricting gas exchange to the roots.

Does gravel count as landscaped area for council?

Usually not. Most NSW councils define landscaped area as part of a site used for growing plants, grasses and trees, excluding buildings, structures and hard paved areas. Stone is a hard surface, so it does not count. Camden Council, for example, requires at least 30 per cent of the site and at least 40 per cent of the front setback to be landscaped, and excludes strips narrower than 1.5 metres. Artificial turf does not count either. Use stone as mulch within planting beds rather than as a replacement for them, and check your own council’s controls before covering a large area.

Is gravel cheaper than turf or paving?

As a material, yes. Supply and lay for a decorative stone bed in Sydney typically runs $35 to $70 per square metre, against roughly $80 to $160 for a compacted stone path and considerably more for paving. Turf is cheaper again to install but carries ongoing water and upkeep costs that stone does not. The honest comparison depends on use. Stone is cheapest where nobody walks, and the gap closes quickly once a proper base is needed.

What is the difference between pebbles and gravel?

In Australian usage, pebbles are smooth and rounded, usually river-sourced, and sold in sizes like 10, 20 and 40 mm. Gravel generally means crushed angular stone such as blue metal or deco granite. The practical difference is behaviour rather than appearance. Angular gravel locks together when compacted and stays where you put it, so it suits paths and bases. Rounded pebble rolls and migrates, so it suits beds and decorative areas where nobody is walking.