How it works
The method matters more than a precise-looking number.
The estimator calculates visible wall-face area, applies a system range, then adjusts for access and slope. It adds drainage by lineal metre, optional removal by wall-face area and an explicit professional and approval allowance. The upper band includes contingency.
What the range includes
- base wall-system planning range;
- access and working-slope adjustments;
- back-of-wall drainage allowance;
- optional existing-wall removal;
- optional engineering, geotechnical, certification or approval allowance;
- GST and upper-band contingency.
What still needs a quote
Actual excavation, spoil volume, temporary works, detailed drainage, loads above or near the wall, soil conditions, boundaries, service conflicts, finishes, warranties and local approval work all require property-specific confirmation.
No national approval shortcut
Do not use wall height alone to decide whether professional design or approval is required. Start with the relevant jurisdiction and property conditions.