Roofing
Roofing Overhead Rate Calculator
Convert total overhead into a rate that can be recovered per crew day or per square.
Result
Overhead is what the business costs whether or not you work. Wages for people who are on jobs belong in job cost instead, and counting them here overstates overhead and underprices everything.
Get a Free Business AuditWhat moves the number
- Total annual overhead counted completely.
- Workable crew days per year, which is the honest denominator.
- Whether recovery is per day, per square or per job.
Where this one goes wrong
Dividing by calendar days or by nominal working days. Roofing loses a substantial number of days to weather, and spreading overhead across days you cannot work under-recovers on every job.
Questions
About this calculator
Per day or per square?
Per crew day usually reflects roofing better, because the constraint is days on site rather than area. Per square works where the roofs are consistent.
What denominator should I use?
Crew days actually worked last year. It is the figure that accounts for weather, and it is usually a good deal lower than the nominal working year.
How often should it change?
Annually, and immediately after an insurance renewal or adding a vehicle or crew. All three move it noticeably.
The formula
overhead rate = monthly overhead / monthly revenue
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How to use this calculator
- Premises per month ($). Enter your own figure; the page starts at $1,800.
- Office and management wages ($). Enter your own figure; the page starts at $5,200.
- Vehicles, fuel and maintenance ($). Enter your own figure; the page starts at $2,400.
- Insurance and licensing ($). Enter your own figure; the page starts at $900.
- Software, phones and internet ($). Enter your own figure; the page starts at $450.
- Marketing and advertising ($). Enter your own figure; the page starts at $1,500.
The result updates as you type, so you can try a figure, see what it does to overhead per month, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Premises per month | $1,800 |
| Office and management wages | $5,200 |
| Vehicles, fuel and maintenance | $2,400 |
| Insurance and licensing | $900 |
| Software, phones and internet | $450 |
| Marketing and advertising | $1,500 |
| Everything else | $700 |
| Monthly revenue | $88,000 |
What comes out
| Result | Value |
|---|---|
| Overhead per month main result | $12,950 |
| Overhead per year | $155,400 |
| Overhead rate | 14.7% |
| Cost of opening the doors | $588.64 |
Overhead runs $12,950 a month, 14.7% of revenue. Every working day costs $588.64 before anybody turns a wheel.
How sensitive the answer is
Holding everything else steady and changing only premises per month, this is what happens to overhead per month. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Premises per month ($) | Overhead per month |
|---|---|
| $900 | $12,050 |
| $1,350 | $12,500 |
| $1,800 example above | $12,950 |
| $2,700 | $13,850 |
| $3,600 | $14,750 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Premises per month ($)
- A money amount, starting at $1,800.
- Office and management wages ($)
- A money amount, starting at $5,200.
- Vehicles, fuel and maintenance ($)
- A money amount, starting at $2,400.
- Insurance and licensing ($)
- A money amount, starting at $900.
- Software, phones and internet ($)
- A money amount, starting at $450.
- Marketing and advertising ($)
- A money amount, starting at $1,500.
- Everything else ($)
- A money amount, starting at $700.
- Monthly revenue ($)
- A money amount, starting at $88,000.
What the results tell you
| Result | What it is |
|---|---|
| Overhead per month | The headline result. A money figure. |
| Overhead per year | A money figure. |
| Overhead rate | A percentage. |
| Cost of opening the doors | A money figure. |
What this cannot see
Material quantities assume a clean rectangular plane and the waste factor you enter. Valleys, hips, dormers, penetrations and a steep pitch all raise real waste, and a tear-off frequently uncovers decking that was not in the quote.
Estimating is the easy part
The jobs you never hear about cost more than the ones you mis-measure. BDEVY builds the marketing, systems and automation that bring them in.