| Office Rent |
Fixed |
Carry $3,500 per month in overhead regardless of job count. |
Allocating rent to each project and overstating delivery expense. |
| Utilities |
Fixed |
Use $400 per month in the base overhead load. |
Modeling small office utilities as if they rise with every client. |
| CRM & Project Management Software |
Fixed |
Include $300 per month as operating overhead for planning. |
Treating the platform subscription like a per-job software charge. |
| Lead Smart Home Consultant salary |
Semi-fixed |
Include $120,000 annually until workload requires another senior hire. |
Spreading salary as a pure variable fee per consultation hour. |
| Smart Home Technician salary |
Semi-fixed |
Model $70,000 annually per full-time role, stepping up as capacity expands. |
Ignoring planned headcount jumps when installation volume rises. |
| Vehicle & Travel Expenses |
Variable |
Apply 5% of revenue in the first year for field visits and travel. |
Leaving travel in fixed overhead and hiding job-level margin pressure. |
| Sales Commissions & Referral Fees |
Variable |
Apply 7% of revenue in the first year because it moves with sales. |
Booking commissions as fixed payroll instead of revenue-linked expense. |
| Hardware Procurement Fee |
Variable |
Apply 3% of revenue in the first year as a direct delivery charge. |
Treating procurement fees like monthly overhead rather than project-linked expense. |