Earthworks cost calculator NZ
Excavation in New Zealand costs roughly $30 to $200 per cubic metre to dig and load in 2026, depending on what is under the grass: $30 to $55 in topsoil or sand, $50 to $85 in clay, and $110 to $200 in rock, papa or buried fill. Carting it away adds about $40 to $75 per cubic metre of loosened spoil. Use the calculator below for your numbers.
Excavation cost by ground condition
| Ground | Per m³ dug and loaded | What it means on site |
|---|---|---|
| Topsoil strip or sand | $30 to $55 | Fast digging, roughly 15% swell, light on machine wear |
| Clay or standard soil | $50 to $85 | The NZ default, about 25% swell, slower in the wet |
| Rock, papa or buried fill | $110 to $200 | Rock breaker or hammer hours, 40%+ swell, dearer disposal |
These are dig and load rates only. They assume a machine that can get to the work and a truck that can get to the machine. Auckland, Wellington and Queenstown labour prices at the top of these ranges; provincial jobs with a short cart to a nearby cleanfill often come in under them.
The lines that actually move an earthworks price
| Line item | Indicative cost | When it applies |
|---|---|---|
| Cartage and tip fees | $40 to $75 per m³ loose | Any spoil that leaves the property |
| Machine float on and off | $350 to $700 | Every job, sometimes buried in the hourly rate |
| Restricted access | Add 25 to 50% | No truck to the dig, micro digger and dumper shuttle |
| Digger and operator, hourly | $90 to $150 per hour | Small or open-ended jobs charged by time |
| Digger and operator, daily | $1,200 to $1,800 per day | Larger machines on multi-day site work |
| Imported hardfill or topsoil | Priced per m³ supplied | Building the level back up after the cut |
| Resource consent and reporting | $2,000 to $8,000 in consultants | Volume, slope or waterway triggers council rules |
Soil swells, and that is what you pay to cart
The single most misunderstood number in an earthworks quote is volume. Ground sitting compacted under your lawn takes up more space the moment it is broken up and lifted into a truck. Sand gains roughly 15 percent, common soil about 25 percent, and clay or rock 40 percent or more. Cartage and tipping are charged on that loosened figure, so the neat rectangle you measured is never the number on the docket. A contractor who talks about truckloads rather than the size of the hole is usually the one who has priced the job properly.
Work in tip truck loads and the maths gets honest fast. A standard tip truck carries about 6 cubic metres. Take the hole, add the swell, divide by 6, and you have the load count every quote should agree on. Where two quotes differ by thousands, they almost always differ on load count or on who is paying the tip.
Consent and the rules worth checking first
- Councils control earthworks by volume, depth, area and slope, and thresholds tighten near waterways, on flood-prone land and on steep sites. Your district plan is the primary source: check it before booking a machine.
- Work near a boundary, a retaining wall or a neighbour's foundations can need engineering input and, in some cases, building consent. The Building.govt.nz consent guidance sets out when.
- Sediment must stay on your property. Auckland sites in particular are expected to run erosion and sediment controls, and mud tracked onto the road is the fastest way to attract a council visit.
- Before any machine breaks ground, services must be located. Free plans come from beforeUdig, and hitting an unmarked line is the one earthworks mistake that gets genuinely dangerous.
How to use your number
- Run the calculator with your area, depth and ground type. That range is your sanity bracket for the dig and the disposal, nothing else.
- Get at least two itemised quotes that state the volume, the number of truckloads and the disposal rate per load.
- Ask what happens if rock or buried fill turns up. An agreed hourly rate for the unexpected beats a mid-job renegotiation.
- Confirm who holds responsibility for sediment control, service location and reinstatement, in writing, before the machine arrives.
Then pick your contractor from a researched shortlist: browse BuildHub's earthworks and excavation guides by city.
Frequently asked questions
How much does excavation cost per cubic metre in NZ?
As of 2026, digging and loading runs roughly $30 to $55 per cubic metre in topsoil or sand, $50 to $85 in clay or standard soil, and $110 to $200 in rock, papa or buried fill. Carting the spoil away adds around $40 to $75 per cubic metre of loosened material once cartage and tip fees are counted. These are indicative ranges: always rely on itemised written quotes.
Why does the volume in my quote look bigger than the hole?
Because soil swells when you dig it. A cubic metre sitting compacted in the ground becomes noticeably more than a cubic metre once it is broken up and loaded, roughly 15 percent more for sand, 25 percent for common soil and 40 percent or more for clay and rock. Cartage and tip fees are charged on that loosened volume, not on the neat hole, so a 20 cubic metre dig in clay can mean 28 cubic metres of truck space.
What does it cost to cart spoil away in New Zealand?
Budget roughly $40 to $75 per cubic metre of loosened spoil for cartage plus tipping in 2026, with the exact figure driven by how far the trucks travel and what the material is. Clean, uncontaminated soil goes to a cleanfill cheaply. Anything mixed with rubble, treated timber or contamination costs considerably more, and the disposal levy applies to material that is not virgin excavated natural material.
How many truckloads will my job be?
A standard tip truck carries about 6 cubic metres, and a truck and trailer roughly double that. Take your dig volume, add the swell factor for your ground, then divide by 6. A 60 square metre driveway dug 300mm deep is about 18 cubic metres in the ground, near 23 cubic metres loose in clay, so about four tip truck loads. Ask every contractor how many loads they have allowed: that single line explains most of the gap between quotes.
Why is a tight site so much more expensive?
Access decides the machine, and the machine decides the day rate. A site a truck can back into takes a full size digger loading straight into the tray. A rear section with a 900mm side gate takes a micro digger, a dumper shuttling to the road, and sometimes a hand barrow. Same hole, two or three times the hours. Expect roughly 25 to 50 percent on top when no truck can reach the dig.
Do earthworks need a resource consent?
Often, yes. Councils control earthworks by volume, depth and area, and the thresholds are tighter on slopes, near waterways, on flood-prone land and in special character or heritage areas. Small domestic digs are usually permitted, but a site cut on a slope frequently is not. Check your district plan rules before you book a machine, because a stop-work notice mid-dig is the expensive way to find out.
How accurate is this calculator?
It uses researched 2026 New Zealand ranges and outputs a bracket rather than a fake-precise number, because ground conditions, cartage distance and access genuinely move the price. It covers excavation and disposal only: basecourse, drainage, retaining, engineered fill and concrete are separate lines on a real quote. Use it to sanity-check quotes, not to replace them.