Project Costing Workbook Guide
A practical guide for structuring project cost inputs so quotes and delivery plans use the same assumptions.
Working record
| Check | What to do | Evidence to retain |
|---|---|---|
| Labor | Estimate the hours for each task and apply the appropriate rate. Keep unbillable coordination or setup visible. | The labor record, its source and the person responsible for resolving missing evidence. |
| Materials | List quantities, purchase units and source quotations. Keep waste or handling allowances separate. | The materials record, its source and the person responsible for resolving missing evidence. |
| Overhead | State which shared expenses are allocated to the job and explain the allocation basis. | The overhead record, its source and the person responsible for resolving missing evidence. |
| Contingency | Record the uncertainty the allowance covers. Keep it separate from the expected cost and target margin. | The contingency record, its source and the person responsible for resolving missing evidence. |
| Margin | Identify the costs included and calculate the portion of selling revenue remaining after them. Keep margin distinct from markup. | The margin record, its source and the person responsible for resolving missing evidence. |
Review the decision
A practical guide for structuring project cost inputs so quotes and delivery plans use the same assumptions. Keep labor, materials, overhead attached to the conclusion so the next owner can challenge the assumptions. Resolve missing evidence before treating this record as approval.
Continue the decision
How to Build a Project Cost Estimate With Fewer Surprises · How to Price a Service Without Guessing.
Calculation and source notes
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026