How to Lay a Sub-Base for a Driveway (Step-by-Step UK Guide)

Get the Base Right or the Driveway Fails

If your sub-base isn’t done properly, your driveway will sink, move, and cost you more to fix later.

This guide shows you exactly how to lay a solid sub-base using MOT Type 1 — the standard choice for UK driveways and patios.

What You’ll Need

• MOT Type 1 sub-base
• Wacker plate (compactor)
• Shovel / rake
• String lines & level
• Edge restraints (kerbs or edging)

👉 We supply MOT Type 1 bulk bags delivered nationwide — view all building aggregates here

Step 1: Dig Out the Area

Remove all topsoil and soft ground.

• Typical depth: 150–250mm total
• Ensure ground is firm and stable
• Remove any roots or loose material

👉 If you skip this, your base will fail — simple as that.

Step 2: Install Edging (Critical Step)

Before laying sub-base, install your edge restraints.

• Keeps everything locked in place
• Prevents movement over time
• Gives you clean, straight lines

Step 3: Lay MOT Type 1 in Layers

Don’t dump it all in at once.

• Lay in 50–75mm layers
• Spread evenly across the area
• Lightly level before compacting

👉 Use quality MOT Type 1 bulk bags delivered nationwide for consistent results here

Step 4: Compact Each Layer Properly

This is where most people go wrong.

• Use a wacker plate
• Compact each layer thoroughly
• Repeat until fully solid

👉 Proper compaction = no sinking later

Step 5: Build to Final Height

Continue layering and compacting until:

• You reach your required level
• Surface is flat and solid
• Falls (drainage slope) are correct

Typical fall:

• 1:60 away from property

Step 6: Ready for the Next Layer

Once your sub-base is complete:

• Add sharp sand (for block paving) here
• Or lay directly for certain finishes

Your base should now be:
✔ Solid
✔ Level
✔ Fully compacted

Once your base is complete, you’re ready to install your paving — view our full range of driveway block paving

Common Mistakes to Avoid

• ❌ Not digging deep enough
• ❌ Laying Type 1 in one thick layer
• ❌ Skipping compaction
• ❌ Using poor-quality material

👉 Do it properly once — avoid costly repairs later

What Should You Order?

For most driveways, you’ll need:

• MOT Type 1 sub-base (main layer)
• Optional: sharp sand for bedding

👉 View all building aggregates bulk bags delivered nationwide here

Why Order From Us

• Nationwide delivery (no collections)
• Bulk bags from trusted UK suppliers
• 2–5 working day delivery
• 1-hour pre-delivery call

How Much Sub-Base Do You Need for a Driveway?

Getting the depth right is one thing — ordering the right amount is what actually matters.

As a rough guide:

• 100mm depth → around 8–10m² per bulk bag
• 150mm depth → around 5–7m² per bulk bag

Most standard driveways will need multiple bulk bags of MOT Type 1 depending on size.

👉 To work it out properly, use our full guide:
How Much MOT Type 1 Do I Need for a Driveway

Final Word

A strong driveway starts below the surface.

Use the right material.
Lay it properly.
Compact it well.

Everything else sits on top of that.

Need MOT Type 1 Delivered Fast?

We supply bulk bags across the UK for driveways, patios, and building projects.

👉 View all building aggregates here