Infrastructure Cost Per Plot Calculator

Work out infrastructure cost per plot instantly with clear inputs, formula shown and shareable results.

About Infrastructure Cost Per Plot Calculator

Infrastructure cost per plot spreads roads, water, sewerage, power, drainage and street lighting across the saleable plots, since only they generate revenue. Expressing it per square metre of plot allows comparison with the land rate and shows how much of the eventual sale price is servicing rather than land.

Formulas

Cost per plot

Per plot = total infrastructure cost x (1 + contingency) / number of plots

Per square metre

Per m² = cost per plot / average plot area

Worked example

With the default values below, Infrastructure Cost Per Plot Calculator returns Infrastructure cost per plot of $345,600.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total infrastructure costminimum 0.01: 80,000,000
Number of plotsminimum 1: 250
Contingencyaccepts 0–30 %: 8 %
Average plot sizeminimum 1 m²: 200 m²

Results

Infrastructure cost per plot: $345,600.00
Total cost including contingency: $86,400,000.00
Contingency: $6,400,000.00
Cost per square metre of plot: $1,728.00

Step by step

1Values used
2Cost per plot
3Per square metre
4Infrastructure cost per plot= 345,600.00
5Total cost including contingency= 86,400,000.00
6Contingency= 6,400,000.00
7Cost per square metre of plot= 1,728.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Infrastructure Cost Per Plot figure worked out?

Per plot = total infrastructure cost x (1 + contingency) / number of plots. Infrastructure cost per plot spreads roads, water, sewerage, power, drainage and street lighting across the saleable plots, since only they generate revenue.

Why does plot size affect the per square metre figure so much?

Because most infrastructure cost scales with road frontage and length, not plot area. Larger plots spread the same servicing cost over more square metres, which is why small plot layouts carry a higher servicing burden per unit area.

What values do I need to enter?

This calculator takes 4 inputs: Total infrastructure cost, Number of plots, Contingency, Average plot size. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.