Construction Products, Windows, Doors & Fenestration worked example

Construction Product Demand Gap with available construction product capacity of 920 units: a worked example

Suppose available construction product capacity falls to 920 units. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate the gap between available construction-product capacity and required demand.

The inputs for this scenario

  • Available construction product capacity: 920 units (the input this scenario stresses; the baseline uses 1,840)
  • Required construction product demand: 2,050 units (held at the documented default)
  • Required demand reference: 2,050 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Unit surplus or shortfall = available construction product capacity - required construction product demand.
  • construction product demand gap works out to -55.12 % at these inputs, and this is the headline figure for the scenario.
  • unit surplus or shortfall works out to -1,130 value at these inputs.
  • available construction product capacity works out to 920 value at these inputs.
  • required construction product demand works out to 2,050 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where available construction product capacity sits at 1,840 units and the headline result is -10.24 %, this scenario comes in 438% below the baseline at -55.12 %.
  • It computes the surplus or shortfall between available production capacity and required demand, then expresses that difference as a percentage of a chosen demand reference. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • construction product demand gap: -55.12 % (headline result)
  • unit surplus or shortfall: -1,130 value
  • available construction product capacity: 920 value
  • required construction product demand: 2,050 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Construction Product Demand Gap calculator, set available construction product capacity to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.