Concrete removal and gravel laying

While the finish looks simple, the durability of a gravel surface relies entirely on the preparation beneath. Removing old concrete and installing a professional-grade sub-base ensures your new driveway won't sink, shift, or become a muddy mess after the first British winter.

What Does the Work Involve?

• Site Survey: Checking for underground services (water, gas, electric) and assessing drainage requirements.
• Concrete Breaking: Using heavy-duty pneumatic breakers or hydraulic excavators to crack the existing slab.
• Waste Removal: Clearing the broken concrete and old sub-base, typically using a grab lorry or multiple skips.
• Ground Preparation: Excavating the soil to the required depth and levelling the area.
• Membrane Installation: Laying a heavy-duty geotextile weed membrane to prevent soil mixing with the stone.
• Sub-base Construction: Spreading and compacting MOT Type 1 crushed stone to create a solid foundation.
• Edging: Installing timber, brick, or metal edging to keep the gravel contained and prevent "migration."
• Gravel Laying: Spreading the chosen decorative aggregate to a consistent depth (usually 40-50mm).

Typical Costs

The primary cost drivers are the thickness of the original concrete and site access. If a grab lorry cannot reach the pile, you may need multiple skips, which often costs 30-50% more due to permit fees and lower capacity.

How Long Does It Take?

• Small Patio (up to 15m²): 1–2 days.
• Standard Single Driveway (25-30m²): 2–3 days.
• Large Double Driveway (50m²+): 4–6 days.
• Reinforced Concrete: Add 1 day for cutting through steel mesh if present.

DIY or Professional?

While you can hire a breaker and a skip, concrete removal is back-breaking work that generates tonnes of heavy waste. One cubic metre of concrete weighs roughly 2.4 tonnes; a standard driveway can easily produce 15 tonnes of debris.

Professionals use hydraulic machinery that completes in hours what would take a DIYer days. Furthermore, ensuring the sub-base is correctly compacted requires a heavy vibrating plate (wacker plate) and an expert eye to ensure water runs away from your house foundations.

Note: If you are changing the "footprint" of your driveway or adding a new drop kerb, you must contact your local council regarding Highways licences and planning permission.

Choosing the Right Tradesperson

• Waste Carrier Licence: Ensure they are registered with the Environment Agency to dispose of your concrete legally.
• Insurance: Look for at least £2 million in Public Liability insurance.
• Equipment: Ask if they own their plant (diggers/breakers) or hire it in, as this affects project timelines.

Questions to ask:

• How deep will the MOT Type 1 sub-base be? (It should be at least 100mm for vehicles).
• Will you be using a "grab" or skips for the waste?
• What type of weed membrane do you use? (Ensure it is permeable geotextile, not thin plastic).
• Can I see examples of gravel "stabilisation" grids if the driveway is on a slope?

UK Regulations

• SUDS (Sustainable Drainage Systems): Since 2008, UK law requires new driveways over 5m² to be permeable. Gravel naturally meets this standard without needing planning permission.
• Waste Disposal: "Fly-tipping" carries heavy fines; always ask for a waste transfer note if you have any doubts about where your old concrete is going.
• Part M (Access): Ensure the transition from the pavement to your drive remains level and safe for wheelchairs or prams.

Common Problems

• Sinking/Rutting: This happens when the sub-base is too thin or not compacted properly. Never lay gravel directly onto soil.
• Gravel Migration: Without proper edging or stabilisation grids, gravel will end up in the street or on your lawn.
• Weed Growth: Cheap membranes tear easily. Always use a high-quality, non-woven fabric to prevent weeds from rooting in the sub-grade.
• Incorrect Gravel Size: 10mm "pea shingle" often gets stuck in car tyre treads. 20mm angular stone is the industry standard for driveways as it "locks" together better.

Frequently Asked Questions

Do I need planning permission to replace concrete with gravel?

Usually, no. Because gravel is a permeable surface, it complies with SUDS regulations. You only need permission if you are installing a non-permeable surface or significantly changing the access to a public highway.

What is the best type of gravel for a driveway?

20mm angular stone (like Cotswold Buff or Granite) is best. Smaller 10mm stones get stuck in tyres and "migrate" easily, while rounded "pea shingle" shifts too much underfoot and feels like walking on marbles.

How do I stop gravel from moving around?

For slopes or high-traffic areas, use plastic "honeycomb" stabilisation grids. These hold the stones in place, preventing ruts and making the surface firm enough for wheelchairs and bicycles.

Can I just put gravel over my old concrete?

It is not recommended. Putting gravel over concrete creates a "bearing" effect where the stones slide around on the hard surface, leading to a dangerous and messy finish. It also causes major drainage issues as water cannot soak through the concrete.

How much maintenance does a gravel drive need?

Very little. You may need to rake it occasionally to level out high spots and top it up with a few bags of fresh stone every 3-5 years. Any surface weeds can be easily removed by hand or with a light spray of weedkiller.