What is the difference between rebuild cost, markup and gross margin?

Confusing margin with markup creates pricing mistakes. Markup measures profit against cost; gross margin measures gross profit against selling price. They can describe the same job but produce different percentages.

What matters in practice

In a hypothetical job, direct labour is £1,800, replacement parts £2,400, outside machining £700 and allocated production costs £600. Total assigned cost is £5,500. At a selling price of £7,500, gross profit is £2,000 and gross margin is 26.7%; markup on cost is 36.4%.

A practical engineering example

If an unexpected £800 part is required but the selling price remains unchanged, assigned cost becomes £6,300, gross profit falls to £1,200 and margin becomes 16%. This is why estimates require live updates.

How to assess the requirements

• Define whether calculations include VAT; generally use comparable net values for commercial margin.
• Record estimated and actual labour consistently.
• Treat recovered components using an explicit valuation policy rather than assuming they are free.
• Avoid calling a job fully profitable before outstanding costs and adjustments are considered.

What this means when choosing software

Review this subject with the people who actually perform the work. Write down the current evidence, responsible role, exception path and report needed to make a reliable decision. Then assess whether proposed software supports those requirements without creating unnecessary administration.

A useful purchase decision should consider the people, information and approvals involved—not only screen layouts. Make clear which processes remain the customer’s responsibility and which a software provider has actually demonstrated.

Common questions

What is the gross-margin formula?

(Net selling price − relevant assigned cost) ÷ net selling price × 100.

Does gross margin equal company net profit?

No. Corporate overhead, financing, tax and other costs may sit outside a job-level gross margin.

Practical next step

Use a sample completed job to test whether your reporting produces traceable cost and margin figures.