In the construction industry, profit margins are razor-thin, and accurate pricing can mean the difference between a profitable project and a financial disaster. Yet many building companies fall into a common trap: confusing markup with margin. This simple misunderstanding can lead to significant under-pricing, ultimately leaving money on the table.
The Key Difference Between Markup and Margin
Margin is the percentage of revenue that remains as profit after covering costs — what you "keep" after expenses:
Margin = (Revenue - Cost) ÷ Revenue
Markup is the percentage you add to your cost to arrive at your selling price:
Markup = (Revenue - Cost) ÷ Cost
Your markup percentage will always be higher than your margin percentage for the same cost and selling price. Markup does not equal margin — but the markup on tenders should equal the intended margin in the accounts.
The Impact of Incorrect Calculations on a £400k Project
Suppose your company is pricing a £400,000 project and believes it is marking up costs by 20%. Here is what actually happens:
- Intended markup: 20%
- Cost: £400,000
- Selling price: £400,000 × 1.20 = £480,000
- Actual margin: (£480,000 - £400,000) ÷ £480,000 = 16.67%
To achieve a true 20% margin, the correct formula is:
Selling Price = Cost ÷ (1 - Desired Margin) = £400,000 ÷ 0.80 = £500,000
By using markup instead of margin, you underpriced the project by £20,000. On a portfolio of projects, this mistake compounds quickly. The higher your intended markup, the bigger the gap between expected and actual margin:
- 15% markup → 13.04% actual margin
- 20% markup → 16.67% actual margin
- 25% markup → 20.00% actual margin
Conclusion
The confusion between markup and margin might seem like a small detail, but its impact can be enormous — particularly as project values grow. By understanding and applying the correct calculations, the intended profits added by estimators will actually manifest themselves in the accounts. If you find you have been using the wrong calculation, the good news is it can be unwound without losing the competitive position you have built.
