| Raw Materials and Millwork Sourcing |
Variable |
Apply as 18.0% of revenue in the first year, then adjust by year as the material rate changes. |
Treating millwork as a flat monthly budget understates revenue needed when job volume rises. |
| Installation Consumables and Fasteners |
Variable |
Apply as 4.5% of revenue in the first year because use rises with each install. |
Putting fasteners in overhead hides the true margin on each job. |
| Project Logistics and Fuel |
Variable |
Apply as 5.0% of revenue in the first year since travel and delivery activity follow job volume. |
Treating fuel as fixed makes break-even look too low during busy months. |
| Subcontracted Specialty Finishing |
Variable |
Apply as 2.0% of revenue in the first year, rising in later years as more specialty work is outsourced. |
Classing finishing as overhead misses job-level labor that scales with sales. |
| Workshop and Storage Lease |
Fixed |
Include $2,800 per month in fixed overhead for the relevant planning range. |
Allocating lease only to active jobs can make slow months look better than they are. |
| General Liability and Workers Comp Insurance |
Fixed |
Include $650 per month as fixed overhead across the break-even period. |
Dropping insurance below the break-even line understates the monthly revenue floor. |
| Cloud Quoting and Project Software |
Fixed |
Include $220 per month as fixed operating overhead. |
Treating software as per-job spend overstates variable expense and distorts contribution margin. |
| Salaried Field and Admin Payroll |
Semi-fixed |
Model payroll in headcount steps, because staffing rises by year as capacity expands. |
Spreading payroll as a sales percentage hides the cash impact of each hiring step. |