Breaking up a poured concrete garden path is a satisfying DIY project that most capable homeowners can tackle over a weekend. The key is working in manageable sections, using the correct tools, and protecting yourself and those around you throughout the job. Here's how to do it safely and efficiently.
Plan Before You Swing
Before you lift a hammer, take a few minutes to assess the path:
- Check for reinforcing (rebar or mesh). Older paths may have steel reinforcing embedded in the concrete. If you spot rust staining or the concrete is thicker than about 100 mm, assume there's steel inside. You'll need bolt cutters or an angle grinder to cut it free.
- Locate underground services. Water pipes, irrigation lines, and electrical conduits sometimes run beneath or alongside garden paths. Check with your local council or contact your utility providers if you're unsure. Use a cable and pipe locator (available to hire) before digging or breaking.
- Measure the slab thickness. Residential garden paths are typically 75–100 mm thick. Thicker slabs require more effort and heavier equipment.
- Plan your section sizes. Aim for pieces no larger than roughly 300 mm × 300 mm — small enough to lift safely (under 20 kg per piece where possible). Scoring the path into a grid before breaking makes removal much easier.
Gather the Right Tools and PPE
Having the right gear makes the job safer and faster.
Tools
- Electric or petrol demolition hammer (jackhammer) — available to hire from most tool hire shops. A 10–15 kg electric breaker suits most residential slabs.
- Cold chisel and club hammer — useful for starting cracks and tidying edges.
- Angle grinder with a diamond blade — for scoring cut lines and cutting any rebar.
- Pry bar — for levering broken sections free.
- Wheelbarrow and heavy-duty skip bags — for removal.
Personal Protective Equipment (PPE)
Never skip PPE — concrete fragments and tool vibration cause serious injuries.
- Safety glasses or goggles (flying chips are a real hazard)
- Hearing protection (demolition hammers exceed 100 dB)
- Dust mask rated P2 or better — concrete dust contains silica, which causes serious lung disease with repeated exposure. See WorkSafe NZ for guidance on silica dust risks.
- Heavy leather gloves
- Steel-capped boots
- Long sleeves and trousers
Step-by-Step: Breaking the Path in Sections
Step 1 — Score the Slab
Using an angle grinder fitted with a diamond blade, score lines across the path every 300–400 mm. Cut to roughly half the slab depth. This controls where the concrete breaks and keeps pieces manageable. Wet-cutting (with water) reduces dust significantly.
Step 2 — Start at an Edge or Existing Joint
Concrete is easiest to break where there's already a free edge. If the path has existing control joints or cracks, start there. Position the demolition hammer chisel point at a score line near the edge and work inward.
Step 3 — Work Systematically
Break one section at a time, moving along the path rather than jumping around. Keep bystanders — especially children and pets — well clear of the work area. Concrete can throw sharp fragments several metres.
Step 4 — Cut and Remove Rebar
If you encounter steel reinforcing, cut it with an angle grinder or bolt cutters once the surrounding concrete is broken away. Stack rebar separately — many scrap metal dealers will take it.
Step 5 — Lever and Lift Safely
Use a pry bar to lever broken pieces free. Lift with your legs, not your back. For heavy pieces, use two people or break the chunk smaller before lifting. Pieces over about 20 kg should be split further.
Disposing of the Broken Concrete
Concrete is classified as inert fill and cannot go in your general rubbish bin. Options include:
- Hire a skip bin — most NZ skip hire companies accept clean concrete (no asbestos, no contamination). Confirm with the supplier.
- Council transfer station — many accept concrete rubble for a fee. Check your local council's website for accepted materials and charges.
- Reuse on site — crushed concrete can be used as hardcore fill under new paving or in low-lying areas of the garden.
- Freecycle or Facebook Marketplace — broken concrete is sometimes wanted for fill or gabion baskets.
Is a Building Consent Required?
Removing a garden path is generally exempt from building consent under Schedule 1 of the Building Act 2004, as it is not a structure covered by the NZ Building Code. However, if the path is connected to a retaining wall, steps, or a drainage system, the situation may be different. Always confirm with your local council before starting work. See MBIE Building Performance for general guidance on consent exemptions.
Asbestos Awareness
If your home was built before the mid-1980s, be aware that some older concrete products and associated materials (such as fibrous cement edging or nearby cladding) may contain asbestos. If you suspect asbestos, stop work immediately and contact a licensed asbestos assessor. WorkSafe NZ has clear guidance on identifying and managing asbestos safely.
When to Call a Professional
Consider hiring a qualified demolition contractor (find one on tradedirectory.co.nz) if:
- The path is very large, heavily reinforced, or thicker than 150 mm.
- You suspect asbestos-containing materials nearby.
- Underground services are present and their exact location is unknown.
- You don't have access to appropriate tools or are not confident working with heavy equipment.
- The path is adjacent to a building foundation, retaining wall, or drainage structure.
A professional demolition contractor will have the right machinery, insurance, and waste disposal contacts to get the job done quickly and safely.
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