Smoke Barrier Installation Break-Even: $925K Monthly Revenue

Fixed costs $61.0K/mo Base payroll + overhead

Contribution margin 62.6% After variable costs

Break-even revenue $97.5K/mo Monthly target

Break-even timing Month 5 Launch ramp

Break-even calculator

Use this calculator to test monthly revenue, variable expenses, and fixed costs against break-even for smoke barrier installation work.

Lean Base Full

Monthly revenue Monthly revenue is the cash sales base that funds margin after direct costs. $ Low sales High sales Variable expenses These are direct costs that rise with each month of work. $ Low costs High costs

Money available to cover fixed costs $337,587 $466,333 revenue - $128,747 variable expenses

Margin ratio

72%

Covers fixed costs

Yes

Fixed monthly costs These are the monthly overhead costs break-even must cover. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which smoke barrier installation expenses are fixed, and which move with project volume?

Cost classification

Break-even is only useful if each expense moves the way the model says it moves. One wrong label can make the Month 5 break-even point look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse and Office Lease	Fixed	Treat as $6,500 per month from Month 1 through Month 60, regardless of how many projects close.	Treating rent as project-driven.
General Liability and Professional Insurance	Fixed	Carry $2,200 per month before bids, during slow months, and during growth months.	Ignoring required coverage before awarded work.
Fire Rated Materials and Sealants	Variable	Model as 18% of first-year revenue, then adjust with job volume and pricing.	Undercounting waste, punch-list work, and rework.
Job Specific Equipment Rental	Variable	Use 4% of first-year revenue because rental needs rise with site count and scope.	Assuming owned gear covers every site.
Fuel and Vehicle Maintenance	Semi-variable	Model the usage-linked portion at 3% of first-year revenue, while keeping base fleet needs in mind.	Missing mobilization distance between jobs.
Sales Commissions and Incentives	Variable	Apply 5% of revenue as awarded projects and billings increase.	Forgetting bid-level incentives.
Salaried Senior and Installation Technicians	Semi-fixed	Year 1 senior and installation technician payroll is $274,000 per year, or about $22,833 per month, and rises in staffing steps.	Assuming payroll flexes daily with workload.
Year 1 Marketing	Semi-variable	Annual spend is $45,000, or $3,750 per month; campaigns can move, but spend does not guarantee awarded jobs.	Confusing spend with guaranteed jobs.

How do lean, base, and full smoke barrier contractor scenarios change break-even pressure?

Scenario table

Lean, base, and full cases change break-even because revenue scales faster than fixed overhead, and the mix shifts toward higher-margin work. If utilization slips, the cushion shrinks fast.

Planning cases only; actual results will move with job mix, utilization, and pricing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$1,518k	$455k	$648k	70.0%	$415k	It clears break-even, but the cushion is still modest.
Base operating case	$3,148k	$907k	$794k	71.2%	$1,447k	This is the cleanest path to break-even with a strong cushion.
Full backlog case	$7,778k	$1,959k	$1,609k	74.8%	$4,210k	Big cushion, but it only holds if the larger crew stays busy.

What breaks the break-even plan for a smoke barrier installer?

Stress test

Year 1 still clears break-even by a wide margin, but the cushion shrinks fast if starts slip or costs creep. The danger line is $925,000 in annual revenue; below that, idle crews, overtime, rework, and premium insurance start to bite.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$925,000	$896,000 cushion	Healthy buffer if projects start on time.
Revenue shortfall	Year 1 revenue slips to $1,518,000.	$925,000	$593,000 cushion	The plan still works, but the margin of safety gets thin.
Fixed-cost increase	Annual fixed overhead rises $12,000.	$942,000	$879,000 cushion	Lease, insurance, or admin creep pushes break-even higher.
Margin pressure	Variable expense rises 1 point from overtime and waste.	$938,000	$883,000 cushion	A small cost leak lifts break-even faster than it looks.
Combined pressure	Year 1 revenue slips to $1,518,000, fixed overhead rises $12,000, and variable expense rises 1 point.	$955,000	$563,000 cushion	Delayed starts plus waste and overhead creep can erase a big chunk of the buffer.

Can you prove smoke barrier jobs will cover the lease, crews, and startup spend before you sign the first major commitment?

Founder checklist

The model breaks even in Month 5, but only if bid flow, margin, and cash all match the plan. Test those three first, then commit to lease space, vans, and hiring.

1Bid access$11.4K/job

Verify you can win installation work at 120 billable hours at $95 per hour before you lock a warehouse lease.

2Fixed load$61.0K/mo

Verify the monthly wage load plus lease and overhead stay covered by booked work, not just hoped-for growth.

3Margin mix70% CM

Verify supplier terms keep materials near 18% of revenue and other variable costs near plan so contribution margin stays strong.

4Crew ramp$22.8K/mo

Verify certified senior tech and installer coverage is lined up before you add work, or backlog will slip and payroll will outrun output.

5Cash reserve$673K min

Verify you can hold the model's minimum cash in Month 6 while funding the $210K startup capex package.

6Lead flow$45K / $1.5K CAC

Verify Year 1 marketing spend can produce enough qualified leads at the planned acquisition cost before you hire ahead of backlog.