| Office Rent |
Fixed |
Include $3,500 per month in fixed overhead. |
Spreading rent across jobs and understating baseline overhead. |
| Utilities (Office & Depot) |
Semi-variable |
Start with the $500 monthly base, then review usage as crews and depot activity grow. |
Assuming the whole bill stays flat at higher service volume. |
| Vehicle Fleet Lease & Maintenance |
Semi-fixed |
Include $2,500 per month until capacity requires another vehicle step-up. |
Modeling fleet expense as fully variable with each customer. |
| Software Subscriptions (CRM, Accounting, FSM) |
Semi-fixed |
Use $1,200 per month, then step it up when users, dispatch volume, or modules expand. |
Keeping software flat after headcount and customer count scale. |
| Subcontractor Fees |
Variable |
Apply the first-year 8.0% of revenue rate to jobs needing outside trade capacity. |
Treating subcontractors like fixed overhead instead of job-linked delivery expense. |
| Direct Labor Wages (Hourly Staff) |
Variable |
Apply the first-year 6.0% of revenue rate for hourly field work tied to billable hours. |
Counting hourly labor as fixed payroll and overstating contribution margin. |
| Maintenance Materials & Supplies |
Variable |
Apply the first-year 3.0% of revenue rate because supplies rise with completed work. |
Forgetting small parts, consumables, and job materials in break-even math. |
| Payment Processing Fees |
Variable |
Apply the 1.5% of revenue rate to customer payments. |
Leaving card fees below the contribution margin line. |