How Thick Should a Concrete Driveway Be for Cars, Utes and Caravans?

Quick answer: A residential concrete driveway for standard cars is typically poured at around 100 millimetres thick. For utes, 4WDs and caravans, 125 millimetres is a safer choice, and 150 millimetres or more suits heavy vehicles, trailers and frequent heavy loads. Thickness works together with reinforcement mesh, concrete strength and a compacted base to determine how long the driveway lasts.

Thickness alone does not make a strong driveway. A thick slab on poorly compacted sand will still crack, while a correctly designed 100 millimetre slab on a good base can perform for decades.

Recommended Concrete Driveway Thickness at a Glance

These are general guides, not engineering advice. A reputable concreter, or an engineer for heavy loads, should confirm the specification for your site.

Why Concrete Thickness Matters

A concrete slab spreads the weight of vehicles over the ground below. The thicker and stronger the slab, the better it spreads that load and resists bending, cracking and edge failure.

Thickness affects:

Load capacity. Heavier axles create more stress. Thin slabs under heavy vehicles can crack under repeated loading.

Cracking resistance. A thicker slab is more resistant to bending, especially if the base is slightly uneven.

Edge strength. Driveway edges take the most punishment from turning wheels. Thicker edges, or thickened edge beams, reduce chipping and breaking.

Lifespan. Correct thickness helps a driveway last 25 to 30 years or more.

Cost. Every extra 25 millimetres adds concrete volume and cost, so it is worth matching thickness to real use.

How Thick Should a Driveway Be for Cars?

For regular cars, hatchbacks, sedans and small SUVs, a thickness of 100 millimetres is the common residential standard in Australia. This works well when the base is properly prepared and the slab is reinforced with mesh.

Many homeowners choose 125 millimetres even for cars because:

• Family vehicles have become heavier, especially SUVs and electric cars.
• Delivery vans and occasional heavy visitors may use the driveway.
• The extra cost is relatively small compared with the total job.
• Sandy or variable ground benefits from extra strength.

If your driveway will only ever carry light cars, 100 millimetres is usually sufficient. If you are unsure, ask your concreter about the cost difference for 125 millimetres.

How Thick Should a Driveway Be for Utes and 4WDs?

Utes and large 4WDs often weigh between two and three and a half tonnes, especially when loaded with tools, canopies or towbars. They concentrate more weight on each axle than a small car.

For these vehicles, a thickness of 125 millimetres with SL82 mesh is a sensible choice. This is particularly important if:

• The vehicle is parked and driven daily.
• You carry heavy loads or tow regularly.
• The driveway has tight turns that stress the slab.
• Work vehicles or trailers are parked on the driveway overnight.

How Thick Should a Driveway Be for Caravans?

Caravans and camper trailers present a particular challenge because weight is concentrated through small wheel contact points and, when parked, through the jockey wheel or stabiliser legs. Loaded caravans can weigh well over two tonnes, and large tandem-axle models can approach or exceed three and a half tonnes.

For caravan parking or storage on a driveway, aim for:

• 125 to 150 millimetres of concrete.
• SL82 mesh or heavier reinforcement.
• A well-compacted base of crushed rock or limestone, commonly 100 to 150 millimetres deep.
• A higher strength mix, such as 32 MPa, if your concreter recommends it.
• Thickened edges where the caravan will turn or park.

Consider placing a wider or thicker section where the jockey wheel rests, since small wheels create high point loads. Parking on timber or a load-spreading plate can also help.

How Thick Should a Driveway Be for Trucks, Motorhomes and Skip Bins?

If your driveway will regularly take delivery trucks, large motorhomes, concrete trucks or skip bins, treat it as a heavy-duty slab. Typical specifications start at 150 millimetres with heavier reinforcement, and an engineer should confirm the design. Standard residential driveways are not designed for repeated heavy truck traffic.

If you only occasionally need a truck on the driveway, ask your concreter about strengthened sections near the entrance or use temporary ground protection for delivery days.

Concrete Strength: The Other Half of the Equation

Concrete strength is measured in megapascals, or MPa, at 28 days.

Many residential driveways use around 25 MPa, and the City of Mandurah’s published commercial crossover specification references 25 MPa at 28 days. For coastal homes, caravan parking or heavier vehicles, stepping up to 32 MPa is a common and sensible upgrade. Ask your supplier and concreter what grade suits your site.

Reinforcement: Mesh, Bars and Cover

Steel reinforcement does not stop concrete cracking, but it holds cracks tight and helps the slab act as one piece.

SL72 mesh is common for standard light residential slabs and driveways.

SL82 mesh has heavier wire and is often used for larger vehicles or higher-load driveways.

F82 mesh and bars are used in thicker commercial and heavy-duty slabs.

Correct placement matters as much as mesh size. Reinforcement should be supported on bar chairs, lapped properly and kept at the correct cover from the surface. Mesh lying on the ground does very little. In coastal Mandurah, adequate cover over steel helps resist corrosion from salt exposure.

The Base: Why Thickness Alone Is Not Enough

Good base preparation is the foundation of the whole driveway. Mandurah’s sandy soils drain well but must be compacted properly. A typical base uses compacted crushed rock or limestone, often 100 to 150 millimetres deep, over a firm, levelled subgrade.

Common base problems include:

• Loose or uncompacted sand, which settles and leaves voids under the slab.
• Soft spots and fill, which cause uneven support.
• Tree roots, which lift or crack slabs.
• Poor drainage, which washes out base material.

A thinner slab on a well-prepared base often outperforms a thicker slab on a poor one. Ask your concreter how they will prepare and compact the base.

Control Joints and Slab Layout

Concrete shrinks as it cures, and cracks are normal. Control joints guide those cracks into planned lines. As a rough guide, joint spacing is often around 24 to 30 times the slab thickness, which means roughly two and a half to three metres for a 100 millimetre slab.

Good practice includes:

• Cutting or forming joints early enough, especially in hot weather.
• Avoiding long, narrow panels that crack across the middle.
• Placing joints at changes in width and at the crossover boundary.
• Using expansion joints against buildings, kerbs and fixed structures.

Thickened Edges and Edge Beams

Driveway edges are vulnerable because they have less support and take turning loads. Some driveways use a thickened edge or edge beam, particularly where heavy vehicles turn or where the ground slopes. Ask your concreter whether this is worthwhile for your layout.

Council Crossover Thickness in Mandurah

The crossover across the verge is regulated separately from the driveway inside your boundary. The City of Mandurah’s published residential specification has referenced a minimum of around 100 millimetres of concrete, and its commercial and industrial specification references 150 millimetres with F82 mesh. Because specifications can be updated, confirm the current requirements with the City before you build. Your driveway thickness inside the boundary can be greater than the crossover if your vehicles require it.

Should You Pay for a Thicker Driveway?

A thicker slab costs more because it needs more concrete. Increasing from 100 to 125 millimetres adds roughly 25 percent more concrete volume, though labour and other costs stay similar. Many homeowners consider this a worthwhile upgrade when:

• They own a ute, 4WD or caravan.
• They expect to keep the home for many years.
• The soil is sandy or variable.
• They want to reduce the risk of cracking and edge damage.

The cheapest approach is to design for the heaviest vehicle you realistically expect over the life of the driveway, not just the vehicle you own today.

Questions to Ask Your Concreter

• What thickness and concrete strength do you recommend for my vehicles?
• What mesh will you use, and how will you support it?
• How deep will the base be, and how will you compact it?
• Where will you place control joints?
• Will the edges be thickened?
• How does the crossover specification differ from the driveway?
• What warranty do you offer?

Frequently Asked Questions

Is 100 mm enough for a concrete driveway?

Yes for standard cars with a well-compacted base and mesh. For utes, 4WDs and caravans, 125 millimetres is usually safer.

How thick should a driveway be for a caravan?

Most concreters recommend 125 to 150 millimetres with SL82 mesh, plus a strong base and thickened edges where needed.

What mesh is used in a concrete driveway?

SL72 is common for cars, while SL82 is often chosen for heavier vehicles. Your concreter should confirm the right choice.

What concrete strength is best for a driveway?

Around 25 MPa is common for standard driveways, while 32 MPa is often used for heavier loads and coastal conditions.

Does a thicker driveway stop cracking?

It reduces the risk but does not eliminate cracking. Joints, base preparation, curing and reinforcement all matter.

How deep should the base be?

Commonly 100 to 150 millimetres of compacted crushed rock or limestone, adjusted for soil conditions.

Can I park a truck on a residential driveway?

Occasional light trucks may be fine, but heavy or frequent truck traffic needs a heavy-duty design with engineering input.

Final Thoughts

For most Mandurah homes, a concrete driveway poured at 100 millimetres suits standard cars, 125 millimetres suits utes, 4WDs and many caravans, and 150 millimetres or more suits heavy vehicles. Combine the right thickness with appropriate mesh, a suitable concrete strength, a well-compacted base and properly placed joints.

Tell your concreter exactly what you drive, tow and park, and ask them to explain the specification in writing. A slightly thicker, better-designed driveway costs little extra upfront and can save thousands in repairs over its lifetime.