| Design studio lease |
Fixed |
Include $6,500/month in baseline overhead before calculating contribution margin. |
Spreading rent across jobs and hiding the true monthly hurdle. |
| Engineering software licenses |
Fixed |
Include $1,200/month as recurring operating overhead from Month 1 to Month 60. |
Treating licenses as project labor instead of a standing capacity charge. |
| Core first-year salaries |
Fixed |
Include $36,250/month for the first-year leadership, engineering, project, and sales team. |
Excluding salaried staff because direct labor is already in project COGS. |
| Subcontractor installation fees |
Variable |
Deduct as a revenue-linked fee, starting at 5.5% of revenue in the first year. |
Using a flat monthly estimate instead of tying fees to project revenue. |
| Sales commissions |
Variable |
Deduct 3.0% of revenue in each forecast year before fixed overhead coverage. |
Counting commissions below EBITDA and overstating contribution margin. |
| Pumps, filtration, nozzles, controls, piping, and direct installation labor |
Variable |
Assign per unit sold because these build inputs rise with project count and scope. |
Treating direct build labor as overhead instead of project expense. |
| Testing support, logistics management, and site coordination |
Semi-variable |
Model with a volume-linked driver because activity rises with jobs but not in a perfect line. |
Forcing every support activity into a fixed monthly bucket. |
| Project managers and aquatic engineers |
Semi-fixed |
Add in staffing blocks as workload grows, such as project managers rising from 1.0 FTE to 5.0 FTE. |
Assuming salary expense scales smoothly with every single project sold. |