How to Remove an Old Concrete Driveway Slab Yourself Safely

Removing an old concrete driveway slab is a physically demanding but achievable DIY project for a capable homeowner. With the right tools, a solid plan, and a focus on safety, you can break up and remove the slab yourself — though for large or reinforced slabs, hiring a professional driveway layer is often the smarter call.

Before You Start: Check for Consents and Underground Services

In most cases, removing an existing driveway does not require a building consent, but replacing it with a new surface might — especially if you're changing the crossover (the vehicle entrance from the road). Always confirm with your local council before you begin. Some councils also have rules about stormwater runoff from driveways, which ties into the NZ Building Code's Clause E1 (Surface Water).

Critically, before any breaking work starts, locate all underground services — water pipes, gas lines, electrical conduits, and drainage. Contact MBIE Building Performance for guidance on your obligations, and use a service locator (many are free or low-cost) or call Dial Before You Dig (0800 248 344) to get utility plans for your property.

Tools and Equipment You'll Need

Having the right gear makes this job far safer and faster:

• Electric or petrol demolition hammer / jackhammer — available to hire from most tool hire shops
• Angle grinder with diamond blade — for scoring cut lines
• Bolt cutters or angle grinder — for cutting reinforcing mesh or rebar
• Pry bars and mattocks — for lifting broken sections
• Wheelbarrow — for moving rubble
• Skip bin or trailer — for disposal
• Personal protective equipment (PPE): safety glasses, hearing protection, heavy-duty gloves, steel-capped boots, and a P2 dust mask

Tool hire is available at Bunnings and Mitre 10, or through specialist hire companies.

Safety First

Concrete demolition carries real risks. Follow these rules without exception:

• Always wear PPE — flying concrete chips can cause serious eye injuries
• Silica dust is a serious health hazard — wet-cut where possible, or use a vacuum-shrouded tool; wear a P2 respirator at minimum. See WorkSafe NZ for guidance on managing silica dust exposure
• Never work alone — have someone nearby in case of injury
• Watch for rebar — cut ends are sharp; wear thick gloves and be aware of spring-back
• Keep bystanders and children well clear of the work area

Step-by-Step: How to Break Up a Concrete Slab

1. Prepare the Area

Clear the driveway of vehicles, garden edging, and any obstacles. Mark out any underground services with spray paint.

2. Score the Slab into Sections

Use an angle grinder with a diamond blade to score the slab into manageable sections — roughly 500 mm to 600 mm squares work well. Smaller sections are much easier and safer to lift.

3. Break the Concrete

Start the jackhammer or demolition hammer at the edges or along your scored lines. Work methodically, letting the tool do the work — don't force it. Concrete slabs are typically 100–150 mm thick on residential driveways.

4. Deal with Reinforcing Steel

Many older NZ driveways contain reinforcing mesh or rebar. Once the concrete is broken, use bolt cutters or an angle grinder to cut the steel into manageable lengths. Stack steel separately from concrete rubble — it can often be recycled at a metal merchant.

5. Remove the Rubble

Use a pry bar to lift broken sections into a wheelbarrow. Concrete is extremely heavy — a 600 × 600 mm piece of 100 mm slab can weigh 85 kg or more. Lift with your legs, not your back, and keep loads small. Consider hiring a mini excavator or bobcat for large areas.

6. Dispose of the Concrete Legally

Concrete rubble must be disposed of responsibly. Options include:

• Skip bin hire — most companies accept clean concrete
• Transfer station / council tip — check your local council's accepted materials
• Recycling — some NZ recyclers accept clean concrete for crushing into aggregate

Do not dump concrete rubble on roadsides or in waterways — this is illegal under the Resource Management Act.

What to Do with the Sub-Base

Once the slab is gone, assess the sub-base (the compacted gravel or AP40 underneath). If you're relaying a new driveway, the sub-base condition is critical. A poor sub-base is often why old slabs cracked in the first place. You may need to add or re-compact base course material — BRANZ has useful guidance on ground preparation for paved surfaces.

Estimated Effort and Cost Guide

Costs are approximate guides only and will vary by region and supplier.

When to Call a Professional

Some situations call for a qualified driveway layer or demolition contractor:

• The slab is heavily reinforced with thick rebar
• The driveway is large (over 50–60 m²) or on a slope
• You suspect asbestos in old cement sheeting or expansion joint material (properties where materials may pre-date the phase-out of asbestos-containing products) — stop work immediately and contact a licensed asbestos removalist; see WorkSafe NZ
• You need to saw-cut near the boundary or road — this often requires council approval and specialist equipment
• You want the job done quickly and safely without the physical toll

You can find qualified local driveway layers and demolition contractors on tradedirectory.co.nz.

Sources & Further Reading

• WorkSafe NZ – Silica Dust
• MBIE Building Performance – Building Consents
• BRANZ – Construction and Building Guidance
• Bunnings – Tool Hire and Equipment
• Mitre 10 – Tools and Hardware