Structure & Site
Earthwork Estimating Services in New Zealand
Cut and fill volumes, topsoil strip and engineered fill quantities, calculated from your existing and design levels.
Bulk earthworks are priced on volume and haul distance, and a few hundred millimetres of error in a level can swing the cut-to-fill balance by thousands of cubic metres on a large site. That changes whether you are importing fill or carting it away, and both are expensive.
We calculate earthwork quantities by comparing existing ground levels with design levels across the site, using surface models where you can supply survey data. We separate topsoil strip, bulk cut, engineered fill, unsuitable material removal and topsoil respread, and report the balance so you can plan haul.
This service is used for residential subdivisions, building platforms, commercial sites and rural projects such as tracks and farm building pads.
Scope
What we measure in a earthwork takeoff
| Item | Unit | What it covers |
|---|---|---|
| Topsoil strip | m² / m³ | Strip area and depth, with stockpile volume. |
| Bulk cut | m³ (bank) | Calculated from existing and design surfaces. |
| Bulk fill | m³ (compacted) | Engineered fill by zone, with compaction factor noted. |
| Cut-to-fill balance | m³ | Net import or export, with bulking and compaction factors stated. |
| Undercut and replacement | m³ | Allowances for unsuitable material where the geotech report identifies it. |
| Topsoil respread | m² | Respread areas and depths. |
| Erosion and sediment control | lm / no. | Silt fence, sediment ponds, stabilised entrances. |
Deliverables
What you receive
Earthworks estimates include a cut-and-fill plan showing where volumes come from and go to, which helps with haul planning and staging.
| Itemised quantity sheet | Excel + PDF |
| Marked-up plans | Colour-coded PDF |
| Material and labour schedule | Excel |
| Assumptions and exclusions list |
Who it is for
Built for the people who price the work
- Builders
- Price a sloping site's building platform before committing to a fixed price.
- Subcontractors
- Earthmoving contractors can confirm cut and fill volumes before quoting.
- Developers
- Estimate the earthworks cost of a subdivision layout before engineering is finalised.
- Architects
- Compare the earthworks cost of different building positions on a site.
Process
How a earthwork estimate runs
STEP 01
Upload plans
Upload the topographic survey, earthworks plans and geotech report. Surface files (such as LandXML or DWG with levels) improve accuracy.
STEP 02
Scope confirmation
We confirm bulking and compaction factors, haul assumptions and the scope boundary with civil works.
STEP 03
Takeoff and review
Surfaces are compared to calculate volumes, then checked against section cross-sections.
STEP 04
Delivery
You receive volume reports, a cut/fill plan, quantity sheet and PDF summary.
New Zealand context
Standards and practice
Engineered fill for lightweight structures in New Zealand is commonly specified to NZS 4431, which sets out placement and testing requirements. Where the geotech report refers to it, we include testing allowances.
Most regional and district councils require erosion and sediment controls for earthworks above certain thresholds, and in Auckland the Council's GD05 guidance is widely referenced. We measure the controls shown, and note where none are drawn but consent conditions are likely to require them.
We measure and price to the drawings. Design compliance and building consent remain with your designer and building consent authority.
Cost drivers
What drives the cost of earthwork work
01
Cut-to-fill balance
A balanced site moves material from cut to fill on the same site. An unbalanced one needs import or export, often at a much higher cost per cubic metre once cartage is included.
02
Soil type
Clay, peat, pumice and rock all behave differently. Some can be reused as fill; others cannot. The geotech report decides what is suitable and what must go.
03
Weather window
Earthworks in wet months are slower and may be restricted by consent conditions. We note seasonal restrictions where they may affect programme and cost.
04
Haul distance
The distance to a tip or a fill source can dominate the cost of import and export. We report volumes so you can apply your own haul rates.
Where earthwork estimates go wrong
Earthworks estimates go wrong when bulking and compaction are ignored. A cubic metre in the ground is not a cubic metre in the truck, nor a cubic metre once compacted in fill. Using the wrong factor can make a balanced site look unbalanced, or the reverse.
Undercut is the other trap. When soft or unsuitable ground is found, it must be removed and replaced, often at significant cost. We include undercut allowances where the geotech report suggests the risk.
FAQ
Earthwork Estimating questions
Can you calculate cut and fill from a PDF survey?
Yes, by building a surface from spot levels and contours, but a digital survey file gives a more accurate result.
What bulking and compaction factors do you use?
We use factors suited to the soil types described in the geotech report and state them clearly so you can adjust them.
Do you include cartage?
We report the net import or export volume. Cartage can be priced using your haul distance and rates.
Do you measure retaining walls?
Retaining is usually part of sitework. We can include it in the same estimate if you need it.
Can you estimate staged subdivision earthworks?
Yes. We can report volumes by stage so each stage can be priced and programmed separately.
Related services
- Excavation Estimating
Detailed excavation quantities for footings, basements, trenches and pits, with backfill, disposal and support measured separately.
- Sitework Estimating
Civil and site infrastructure quantities: drainage, water, roads, kerbs, retaining and paving, measured from your civil drawings.
- Landscaping Estimating
Hard and soft landscaping quantities: paving, walls, fencing, planting, mulch and irrigation, measured from the landscape plan.
- Demolition Estimating
Demolition and strip-out quantities by material, with disposal volumes and hazardous material allowances shown separately.
Get a quote
Send your plans for a earthwork estimate
Upload your drawings and we will reply with a fixed fee and turnaround before any work starts. No obligation.
- — PDF, DWG and ZIP accepted
- — Fees in NZD, excluding GST
- — Prefer email? Use the link in the footer