Construction Change Order Pricing Planner methodology

addedDirectCostExTax = added labour + materials + subcontractors + equipment and travel

scheduleDelayCostExTax = site overhead per day * delay days

contingencyExTax = (added direct cost + delay cost) * contingency rate

protectedChangeCostExTax = added direct cost + delay cost + fixed overhead + contingency

requiredChangeOrderPriceExTax = protected change cost / (1 - target margin)

requiredChangeOrderPriceIncTax = required change-order price * (1 + entered tax rate)

retentionHeldExTax = required change-order price * retention rate

initialCollectibleExTax = required change-order price - retention held

revisedContractValueExTax = original contract value + required change-order price

Money inputs and outputs use the currency selected in the scenario without changing the canonical methodology. Rates, margins, utilisation and buffers are entered as percentages and converted to decimal values for calculation.

• All inputs must be finite and inside the visible validation boundaries.
• Rates are retained as decimal values and shown as percentages only at the presentation boundary.
• The worked fixture must expose every declared result: addedDirectCostExTax, scheduleDelayCostExTax, contingencyExTax, protectedChangeCostExTax, requiredChangeOrderPriceExTax, requiredChangeOrderPriceIncTax, retentionHeldExTax, initialCollectibleExTax, revisedContractValueExTax.
• Scenario comparison changes one declared driver while holding the remaining industry records constant.

Original contract value minimum

originalContractValueExTax ≥ 0 currency units/original contract, ex tax — A lower value is rejected before calculation.

Original contract value maximum

originalContractValueExTax ≤ 10,000,000 currency units/original contract, ex tax — A higher value is rejected before calculation.

Incremental site labour minimum

incrementalSiteLabourExTax ≥ 0 currency units/change order, ex tax — A lower value is rejected before calculation.

Incremental site labour maximum

incrementalSiteLabourExTax ≤ 10,000,000 currency units/change order, ex tax — A higher value is rejected before calculation.

Incremental materials minimum

incrementalMaterialsExTax ≥ 0 currency units/change order, ex tax — A lower value is rejected before calculation.

Incremental materials maximum

incrementalMaterialsExTax ≤ 10,000,000 currency units/change order, ex tax — A higher value is rejected before calculation.

Incremental subcontractors minimum

incrementalSubcontractorsExTax ≥ 0 currency units/change order, ex tax — A lower value is rejected before calculation.

Incremental subcontractors maximum

incrementalSubcontractorsExTax ≤ 10,000,000 currency units/change order, ex tax — A higher value is rejected before calculation.

Equipment and travel minimum

equipmentAndTravelCostExTax ≥ 0 currency units/change order, ex tax — A lower value is rejected before calculation.

Equipment and travel maximum

equipmentAndTravelCostExTax ≤ 10,000,000 currency units/change order, ex tax — A higher value is rejected before calculation.

Fixed change overhead minimum

fixedOverheadExTax ≥ 0 currency units/change order, ex tax — A lower value is rejected before calculation.

Fixed change overhead maximum

fixedOverheadExTax ≤ 10,000,000 currency units/change order, ex tax — A higher value is rejected before calculation.

Site overhead per delay day minimum

siteOverheadPerDelayDayExTax ≥ 0 currency units/delay day, ex tax — A lower value is rejected before calculation.

Site overhead per delay day maximum

siteOverheadPerDelayDayExTax ≤ 10,000,000 currency units/delay day, ex tax — A higher value is rejected before calculation.

Schedule delay days minimum

scheduleDelayDays ≥ 0 whole delay days/change order — A lower value is rejected before calculation.

Schedule delay days maximum

scheduleDelayDays ≤ 10,000 whole delay days/change order — A higher value is rejected before calculation.

Sequencing and delay contingency minimum

sequencingAndDelayContingencyRate ≥ 0 decimal fraction of changed-scope direct cost — A lower value is rejected before calculation.

Sequencing and delay contingency maximum

sequencingAndDelayContingencyRate ≤ 1 decimal fraction of changed-scope direct cost — A higher value is rejected before calculation.

Target change-order margin minimum

targetChangeOrderMargin ≥ 0 decimal fraction of change-order price — A lower value is rejected before calculation.

Target change-order margin maximum

targetChangeOrderMargin ≤ 0.99 decimal fraction of change-order price — A higher value is rejected before calculation.

Contract retention rate minimum

contractRetentionRate ≥ 0 decimal fraction of approved change-order price withheld — A lower value is rejected before calculation.

Contract retention rate maximum

contractRetentionRate ≤ 1 decimal fraction of approved change-order price withheld — A higher value is rejected before calculation.

User-entered tax rate minimum

taxRate ≥ 0 decimal fraction of change-order price added as tax — A lower value is rejected before calculation.

User-entered tax rate maximum

taxRate ≤ 1 decimal fraction of change-order price added as tax — A higher value is rejected before calculation.

• Costs, capacity, contract terms, tax rates and targets are supplied by the user.
• No provider default, jurisdictional rule or industry benchmark is embedded.
• The shared engine retains full precision and display formatting never feeds calculation.

This planner has no current policy-data dependency. Its commercial assumptions are user supplied. Registered family-level regression suites exercise the shared business-logic engine and worked-result reconciliation.

• Results are only as reliable as the timing, scope and basis of the entered records.
• The workflow does not predict demand or establish accounting, tax, contractual or legal treatment.

This is educational decision support, not tax, accounting, legal or financial advice. Check the treatment of your actual transactions under the rules that apply to your business and seek qualified advice where appropriate.

Registered family-level suites test formula invariants and example reconciliation; the release ledger records that coverage without claiming a separate oracle for every line of public copy. There is no official threshold or benchmark to refresh for this planner. Commercial inputs remain user-supplied because they vary by business and contract.

1. 2026-07-31: Initial public release of the planner and methodology after pre-launch calculation, content, source and interaction review.