| Office rent |
Fixed |
Carry $3,500 per month in fixed overhead before calculating the revenue needed to break even. |
Spreading rent across inspections and missing the true monthly cash hurdle. |
| Business insurance |
Fixed |
Include $1,200 per month as required overhead that does not rise with each inspection. |
Leaving insurance out because it is not tied to a specific job. |
| Transportation and vehicle costs |
Variable |
Model at 12% of revenue in the first year, declining to 8% by the fifth year. |
Treating travel like overhead instead of a route-driven expense. |
| Report generation software licensing |
Variable |
Apply 5% of revenue in the first year, then reduce to 3% by the fifth year as scale improves. |
Ignoring software per report and overstating contribution margin. |
| Inspector equipment and tools |
Variable |
Use 8% of revenue in the first year, falling to 6% by the fifth year. |
Calling tools a one-time buy when job volume still drives usage and replacement. |
| Annual marketing budget |
Semi-variable |
Start with $4,000 per month in the first year, then test spend against customer acquisition cost. |
Assuming more marketing converts at the same CAC forever. |
| Lead inspector payroll |
Semi-fixed |
Carry $10,000 per month until inspection demand supports another capacity step. |
Treating founder payroll as optional after the service reaches break-even. |
| Senior safety inspector capacity |
Semi-fixed |
Add capacity in steps, using the $75,000 annual salary and Month 7 start point in the staffing plan. |
Hiring before route density supports payroll. |