Removing a large concrete pad is very achievable as a DIY project or with a hired earthmover, but the key to protecting nearby paths is preparation — specifically cutting isolation joints before you start breaking, and controlling vibration throughout the job. Done right, your existing paths should come through completely unscathed.
Why Nearby Paths Are at Risk
Concrete pads and adjoining paths are often poured separately but sit on the same compacted base. When you break up a pad with a jackhammer or excavator, the shock waves and vibration travel through the ground and the concrete itself. If the pad is physically touching a path — even just butted up against it — that energy transfers directly and can crack or shift the path. Undermining the base material beneath a path edge is another common cause of damage.
Step 1 — Assess the Job First
Before hiring any machinery, walk the site and check:
- How thick is the pad? Residential pads are typically 100 mm thick, but garage slabs or industrial pads can be 150 mm or more. Thicker concrete needs more powerful equipment.
- Is there reinforcing steel (reo)? Older pads may have mesh or bar reinforcing that will need to be cut with an angle grinder or bolt cutters as you go.
- What's underneath? If the pad is over a drainage line, power conduit, or irrigation pipe, you need to know before breaking starts. Check your council's property file or use a cable/pipe locator (hire one from Bunnings at https://www.bunnings.co.nz or Mitre 10 at https://www.mitre10.co.nz).
- Is a building consent required? Removing a concrete pad is generally exempt from consent under Schedule 1 of the Building Act, but if the pad is part of a structure (e.g., a garage floor connected to a foundation wall), check with your local council first. See MBIE Building Performance for guidance on consent exemptions.
Step 2 — Cut an Isolation Joint Along the Boundary
This is the single most important step for protecting adjoining paths. Using a diamond-blade concrete saw (available to hire from most tool hire shops), cut a clean, straight line along the full length where the pad meets the path. Cut at least 50–75 mm deep — ideally through the full slab thickness if you can manage it safely.
This severs the physical connection between the two concrete surfaces so that when you start breaking, the shock has nowhere to travel into the path. It also gives you a clean, straight edge on the remaining path once the pad is gone.
Safety note: Concrete cutting produces large amounts of silica dust, which causes serious lung disease. Always use a wet-cut saw or attach a vacuum/dust shroud, wear a P2 respirator, and follow WorkSafe NZ guidelines for working with silica dust.
Step 3 — Score the Pad Into Manageable Sections
Before breaking begins, use the concrete saw to score a grid pattern across the pad — roughly 600–900 mm squares. This does two things:
- It reduces the force needed to break each section, meaning less vibration overall.
- It creates manageable chunks that can be lifted by hand, wheelbarrow, or small machinery without needing to drag large slabs that could lever against the path edge.
Step 4 — Break and Remove Methodically
Start breaking from the centre of the pad and work outward, leaving the sections closest to the path boundary until last. This keeps the weight and vibration away from the vulnerable edge for as long as possible.
Equipment options:
| Method | Best for | Vibration level |
|---|---|---|
| Electric jackhammer (hire) | DIY, pads up to 100 mm | Moderate |
| Petrol jackhammer | Thicker pads, faster work | High |
| Excavator with hydraulic hammer | Large areas, thick slabs | High but controlled |
| Excavator bucket (curl and crack) | Scored slabs, experienced operator | Lower than hammer |
If using an excavator, an experienced earthmover operator can often curl the bucket under a scored section and pop it up cleanly, which generates far less vibration than hammering. This is worth discussing when you hire a contractor.
When you reach the sections adjacent to the path, switch to a hand-held jackhammer rather than machine-mounted equipment, and work carefully. Keep chunks small and lift them clear rather than dragging them.
Step 5 — Protect the Path Edge and Reinstate the Base
Once the pad is removed, inspect the path edge. If the base material (typically compacted AP20 or AP40 gravel) has been disturbed or has slumped under the path edge, it must be reinstated before the area is left. Loose or undermined base material will cause the path to crack or sink over time.
Compact any disturbed base with a plate compactor (also available to hire), and if you're leaving the area as garden or lawn, ensure the ground level doesn't drop away sharply from the path edge, which can cause edge cracking from lack of support.
Step 6 — Concrete Disposal
Broken concrete (also called rubble or demolition concrete) cannot go in your household recycling bin. Options in NZ include:
- Transfer stations — most accept concrete rubble for a fee; check with your local council.
- Recycling — some concrete recyclers will accept clean concrete and crush it for reuse as base aggregate.
- Skip bin hire — convenient for larger volumes; specify concrete-only skips as they are heavier than general waste.
When to Call a Professional
Hire a qualified earthmover or demolition contractor if:
- The pad is over 150 mm thick or heavily reinforced.
- There are underground services you cannot confidently locate.
- The pad is attached to a building foundation or retaining structure.
- You're not comfortable operating a jackhammer or hiring machinery safely.
- The path you're protecting is a council footpath — damaging a public footpath can result in you being liable for repair costs.
A skilled earthmover operator will complete the job faster, safer, and with less risk to surrounding surfaces. You can find qualified local earthmoving contractors on tradedirectory.co.nz.
Site Safe
