Step-by-Step Guide to Installing Sandstone Cobbles

Sandstone cobbles have a warmth to them that's hard to replicate with any other material. The natural colour variation, the slightly rounded edges, the way they look after even a light shower — it's a material that just feels right in a British garden. But installing them well takes a bit of know-how, and doing it badly means an uneven, weedy mess within a couple of years.

This guide walks you through the whole process from start to finish, covering everything from base preparation to the final joint.

Why Choose Sandstone Cobbles?

Indian sandstone cobbles are one of the most versatile hard landscaping materials available. They work equally well in formal and informal settings — a straight edge border alongside a porcelain patio, or a loose, organic path winding through a planted garden. Colours typically range from golden buff and silver grey through to warm caramel tones and cooler blue-grey hues.

Browse our cobblestones collection to see what's currently available, or check out our Indian sandstone range if you're also considering full slabs to complement your cobble areas.

What You'll Need

• Sandstone cobbles (add 10% for wastage and cuts)
• MOT Type 1 sub-base
• Sharp sand or semi-dry mortar (4:1 sand/cement)
• Polymeric jointing sand or kiln-dried sand
• Compactor plate
• Rubber mallet
• String lines and pegs
• Spirit level
• Pointing trowel
• Stiff brush

Step 1: Mark Out the Area

Peg out your area with string lines. Be precise — even a slight drift in your string line early on will compound into a noticeable curve by the time you're halfway through. If you're creating a curved border or path, use a garden hose or spray paint to mark the line first.

Step 2: Excavate to the Correct Depth

This is the most important step and it's where shortcuts always come back to bite you.

For a pedestrian path or garden border:

• 100mm compacted sub-base
• 30–40mm bedding layer (sand or semi-dry mortar)
• Depth of the cobble itself (typically 40–70mm depending on size)

For a driveway or area with vehicle access:

• Increase the sub-base to 150mm minimum
• Use a semi-dry mortar bed rather than loose sand

Remove all topsoil and organic material. If you're near tree roots, be careful — root damage to a new cobble surface is a recurring problem we see with poorly planned installations.

Step 3: Lay and Compact the Sub-Base

Tip in your MOT Type 1 in layers of no more than 100mm at a time and compact each layer separately. Don't try to lay 200mm in one go — it won't compact properly. Use a plate compactor and work in overlapping passes.

Once compacted, check for high or low spots and rectify before moving on. A long spirit level or a taut string line works well here.

Step 4: Install Edge Restraints

Edge restraints prevent lateral spread — essentially stopping your cobbles from shuffling outward over time. Options include:

• Concrete haunching around a perimeter course of cobbles set in full mortar
• Pressure-treated timber edging (less permanent, better suited to informal garden paths)
• Steel or aluminium landscape edging

For driveways and formal areas, concrete haunching is always the better choice.

Step 5: Lay Your Bedding Layer

If you're using a loose sharp sand bed (only suitable for pedestrian use), spread and screed it to around 30–40mm depth, slightly proud of the finished level to allow for compaction.

For vehicle access, use a semi-dry mortar (four parts sharp sand to one part cement, mixed dry). This provides much better stability once the cobbles are laid.

Step 6: Place the Cobbles

Start from a fixed edge. Lay the cobbles individually, pressing each one firmly into the bedding and tapping level with a rubber mallet. The natural variation in sandstone cobble sizes means you'll need to sort and select as you go — mixing sizes creates a more natural, informal look.

Keep joint gaps even at around 8–15mm depending on the finished look you're going for. Larger gaps give a more rustic feel; tighter gaps look more formal and are easier to maintain.

Use a spirit level and a straight edge frequently. It's much easier to re-tap a cobble before the mortar goes off than to deal with a dip later.

Step 7: Compact the Surface

Once you've laid a section, protect the cobbles with a rubber mat and run the compactor over them. This embeds them firmly into the bedding. Recheck levels, re-tap any high spots, and compact again if needed.

Step 8: Joint the Cobbles

Sweep polymeric jointing sand diagonally across the cobbles and work it into the joints. Compact again to settle it, then add more sand and repeat. For a rustic appearance, some people prefer a wet mortar point using a slightly rounded pointing trowel — this gives a more traditional finish.

Brush off all excess from the cobble faces before the jointing material hardens.

For full guidance on jointing compounds and which ones work best with different stone types, visit our installation guide.

Step 9: Leave to Cure

For mortar-bedded installations, keep foot traffic off the area for 24–48 hours and vehicle traffic off for at least 72 hours. For sand-bedded pedestrian paths, 24 hours is generally sufficient.

Maintenance Going Forward

Sandstone cobbles are genuinely low maintenance, but a little care goes a long way. Occasional sweeping, re-sanding of joints if they wash out, and a treatment with a good quality patio cleaner every year or two will keep them looking great. See our maintenance guide for detailed advice on keeping natural stone cobbles in top condition.

If you're comparing sandstone cobbles with granite setts for your project, take a look at our granite paving and setts collection — both are excellent choices, and often the decision comes down to the look you're going for rather than performance.