Breaking up a concrete driveway is a physically demanding job, but with the right preparation, equipment, and safety measures, many NZ homeowners can tackle it themselves. The key is knowing what's beneath the slab, using appropriate tools, and protecting yourself and bystanders throughout the process.
Check for Underground Services First
Before you swing a single hammer or fire up a jackhammer, locating underground services is absolutely critical. Water pipes, electrical conduits, gas lines, and stormwater drains can all run beneath or alongside a driveway slab. Striking one can cause serious injury, property damage, or worse.
- Contact Dial Before You Dig (0800 248 344 or dialbeforeyoudig.co.nz) to request a service location report — this is free and strongly recommended.
- Check your original building plans or ask your local council for any records of services in the area.
- If you find gas or electrical lines close to your work area, stop and call a professional.
For electrical work near buried cables, note that any work on electrical infrastructure is restricted work under the Electricity Act and must only be carried out by a registered electrician. Check the Electrical Workers Registration Board for guidance.
Do You Need a Building Consent?
In most cases, removing a residential concrete driveway does not require a building consent under Schedule 1 of the Building Act 2004 — it is generally considered routine maintenance or demolition of a minor structure. However, always confirm with your local council before starting, as rules can vary depending on your property, any retaining walls involved, or proximity to boundaries. The MBIE Building Performance website has useful guidance on consent exemptions.
Gather the Right Safety Gear
Concrete demolition creates flying debris, dust, and significant noise. Protect yourself with:
- Safety glasses or goggles — non-negotiable; concrete chips travel fast
- Hearing protection — jackhammers and angle grinders exceed safe noise levels quickly
- Heavy-duty gloves — protect against cuts and vibration
- Steel-capped boots — essential when handling heavy slabs
- Dust mask (P2 rated minimum) — concrete dust contains silica, which is a serious respiratory hazard. See WorkSafe NZ for guidance on silica dust exposure
- High-visibility vest if working near a road or shared driveway
Choose the Right Breaking Method
The method you use depends on the thickness of the slab, whether it is reinforced with steel mesh or rebar, and how much concrete you need to remove.
Electric or Petrol Jackhammer (Demolition Hammer)
This is the most effective tool for most residential driveways. Electric jackhammers (also called rotary hammers or demolition hammers) are widely available for hire from Bunnings, Mitre 10, or local hire companies. A petrol-powered unit is more powerful and better suited to thick or reinforced slabs.
- Work in a grid pattern, breaking the slab into manageable pieces (roughly 30–50 cm squares)
- Start at an edge or expansion joint where possible — it's much easier than starting in the middle
- Keep the chisel bit at roughly a 30–45° angle for best results
Angle Grinder or Circular Saw with Diamond Blade
Useful for scoring cut lines before breaking, especially near edges, walls, or garden beds where you want a clean finish. Always use a diamond-tipped blade rated for concrete, and wet-cut where possible to reduce dust.
Sledgehammer
A 4–6 kg sledgehammer can work on thinner, unreinforced slabs but is extremely tiring. Best used in combination with a jackhammer to break up already-cracked sections.
Hydraulic Breaker (Excavator Attachment)
For large driveways or thick reinforced slabs, hiring a mini-excavator with a hydraulic breaker attachment is the most efficient option. This is usually best left to a professional demolition contractor.
Dealing with Steel Reinforcement
Many NZ driveways laid in the last few decades contain steel mesh or rebar. Once the concrete is broken, you'll need bolt cutters or an angle grinder to cut the steel into manageable lengths. Steel reinforcement can be taken to a local metal recycler — many will take it for free or even pay a small amount.
Breaking Up and Removing the Concrete
| Piece Size | Approximate Weight | Handling Method |
|---|---|---|
| 30 × 30 cm, 100 mm thick | ~20 kg | Two-person lift or wheelbarrow |
| 50 × 50 cm, 100 mm thick | ~55 kg | Sack truck or mini-loader |
| Larger pieces | 80 kg+ | Machinery required |
- Never lift more than you can safely manage — back injuries are common in concrete removal
- Use a sack truck or pallet jack to move larger pieces
- Hire a skip bin or arrange a concrete-specific waste removal service. Many skip bin companies accept clean concrete at a lower rate than general waste, or it can be taken to a transfer station
Dust and Neighbour Considerations
Concrete dust and noise can affect neighbours. Let them know in advance, work during reasonable hours, and wet down the work area regularly to suppress silica dust. Check your local council's noise bylaws — most restrict construction noise outside of weekday daytime hours.
When to Call a Professional
Consider hiring a qualified demolition contractor if:
- The slab is heavily reinforced or thicker than 150 mm
- You suspect asbestos in any associated materials (older properties pre-1990s may have asbestos in associated structures — do not disturb until tested)
- Underground services are close to the work area
- You need machinery like an excavator or bobcat
- The driveway is large (over 50 m²) and the job is beyond DIY scope
- You are unsure about any aspect of the work
A professional demolition contractor will have the right equipment, insurance, and experience to get the job done safely and efficiently. You can find qualified local demolition contractors on tradedirectory.co.nz.
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