The Installer's Guide to
Gross Profit, Margin & Break-Even
Most installers don't start out trying to run a business. You start as a good tradesperson, you get busy, then one day, you wake up and realise that you are, without ever being taught how the numbers really work.
This short document exists for one reason only:
To help you understand the few financial terms that actually matter in an installation business, in plain English, without over-complicating it.
Revenue (Turnover)
This is the easiest one.
It is not profit.
A big turnover with weak margins can still mean you're broke, stressed, and working ridiculous hours.
Direct Costs (Job Costs)
These are the costs that only exist because you won the job.
Typical examples:
- Materials
- Labour on the job (including subcontractors)
- Waste removal
- Delivery
- Anything else that would not exist if you hadn't taken that specific job
Gross Profit
This is the first number that actually tells you if your jobs make sense.
If a job doesn't produce enough gross profit, it doesn't matter how busy you are - the business will struggle.
Gross profit is what pays for:
Gross Margin
(This is the important one)
Gross margin is gross profit expressed as a percentage.
This tells you how much of every £ you keep before overheads.
Example (simple):
- • You invoice £10,000
- • The job costs £7,000 to deliver
- Gross profit $=f3,000$
- Gross margin $=30\%$
Margin matters more than turnover. Always.
Overheads
(The costs that never go away)
These costs exist whether you win work or not:
These costs are paid from gross profit.
Break-Even
(the line you must cross)
Break-even is the point where your gross profit exactly covers your overheads.
At break-even:
- The business is not losing money
- The business is not making money
- You are working for survival, not progress
Anything above break-even is where choice, freedom, and profit start to appear.
Understanding your break-even point is critical. Without it, you are guessing.
Net Profit
(The final number)
This is the true measure of business performance.
If net profit is low or zero, it doesn't matter how busy you are the model is broken somewhere.
Clarity with your numbers doesn't limit you - it gives you options.