Removing a concrete path slab is a satisfying weekend project that most capable homeowners can tackle with hired equipment. The key is choosing the right tools, working safely, and having a solid plan for breaking the concrete into manageable pieces and disposing of the rubble responsibly.
Before You Start: Check for Hidden Services
Before swinging a single tool, locate any underground services beneath or near the slab. Water pipes, electrical conduits, and drainage lines are commonly buried under or alongside concrete paths. Contact MBIE Building Performance for guidance on building consent requirements, and ring Dial Before You Dig (0800 248 344) to get service plans for your property. Striking a buried electrical cable or water pipe can be extremely dangerous and costly.
Also check whether your path slab is reinforced with steel mesh or rebar — older slabs often are. Reinforced concrete is heavier and harder to break, and you'll need bolt cutters or an angle grinder to cut through the steel once the concrete is broken.
Safety First
Concrete work is physically demanding and creates hazards you must manage:
- Eye protection — flying chips are a serious risk
- Hearing protection — electric breakers and jackhammers are loud
- Dust mask (P2 rated minimum) — concrete dust contains silica, which causes serious lung disease with repeated exposure. See WorkSafe NZ for guidance on silica dust
- Steel-capped boots and heavy gloves — essential
- High-visibility vest if working near a road or driveway
Wet the concrete surface lightly before breaking to help suppress dust.
What Tools to Hire
For most residential path slabs (typically 75–100 mm thick), you won't need a full excavator. The following hired hand tools will do the job:
| Tool | Best for |
|---|---|
| Electric breaker / demolition hammer | Breaking the slab into chunks |
| Cold chisels and hand sledgehammer | Tidying edges and tight corners |
| Pry bar / wrecking bar | Lifting and separating broken pieces |
| Bolt cutters | Cutting steel reinforcing mesh |
| Wheelbarrow | Moving rubble to a skip or trailer |
Tool hire is available from most Mitre 10 and Bunnings stores, as well as specialist hire companies. Ask the hire shop for the correct chisel bit for your breaker — a flat or spade chisel works well for slab demolition. Mitre 10 and Bunnings both offer tool hire services at many NZ locations.
Step-by-Step: Breaking Up the Slab
1. Score the edges
Use the breaker along the edges of the slab first, working the chisel into the joint between the concrete and the surrounding ground or garden edging. This helps free the slab and gives you a starting point.
2. Work in a grid pattern
Break the slab into a grid of roughly 300–500 mm squares by running the breaker across the surface in parallel lines, then crossing at right angles. Smaller pieces are much easier and safer to lift.
3. Pry and lift
Once broken, use the pry bar to lever pieces up. Concrete is heavy — a 300 × 300 mm piece of 100 mm slab weighs around 20–25 kg. Never lift pieces that are too heavy for you; get a helper or break them smaller.
4. Cut any reinforcing
If you find steel mesh or rebar, use bolt cutters to snip it into manageable lengths once the concrete around it is broken away.
5. Clear the sub-base
Once the concrete is removed, you'll likely find a compacted gravel or sand sub-base. Depending on your plans, you can leave, reuse, or remove this material.
Disposing of Concrete Rubble
Concrete is heavy — a standard 3 m × 1 m path slab at 100 mm thick weighs roughly 700–750 kg. Plan your disposal carefully:
- Hire a skip bin — the most convenient option for most homeowners. Make sure the skip company accepts concrete (some have weight limits).
- Trailer to a transfer station — most NZ councils accept clean concrete rubble at their transfer stations, often at a lower cost than general waste. Check your local council's website for accepted materials and fees.
- Reuse or recycle — broken concrete (sometimes called urbanite) can be reused as fill, retaining wall material, or garden edging. Some recycling yards accept clean concrete for crushing.
Do not put concrete in your kerbside bin or general skip without checking first.
Does This Work Require a Building Consent?
Removing a path slab is generally exempt from building consent under Schedule 1 of the Building Act 2004, as it is demolition of a minor structure. However, rules can vary — for example, if the path is part of a retaining structure or attached to a building. Always confirm with your local council before starting work. See MBIE Building Performance for a plain-English overview of consent exemptions.
When to Call a Professional
Consider hiring a qualified earthmover or demolition contractor if:
- The slab is heavily reinforced or very thick (150 mm+)
- The path is adjacent to a foundation, retaining wall, or building structure
- You suspect underground services that cannot be safely avoided
- The volume of concrete is large and requires machinery to remove efficiently
- You have physical limitations that make heavy breaking and lifting unsafe
A professional earthmover will have the right machinery, insurance, and experience to complete the job quickly and safely. You can find qualified local earthmovers and demolition contractors on tradedirectory.co.nz.
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