Electrochromic Smart Window Break-Even: $75K Monthly Revenue

Fixed costs $54.5K/mo Monthly floor

Contribution margin 70%-75% After variable costs

Break-even revenue $77.8K/mo Revenue needed

Break-even timing Month 19 Model crossing point

Break-even calculator

Test monthly revenue against direct costs and the fixed cost base to see where this installation business breaks even.

Lean Base Full

Monthly revenue Revenue is the top line that creates room to cover direct costs and overhead. $ Low sales High sales Variable expenses These are direct costs that rise with each project, like hardware, wiring, shipping, and sales fees. $ Lean costs Heavy costs

Money available to cover fixed costs $124,649 $172,167 revenue - $47,518 variable expenses

Margin ratio

72%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base the business has to cover before profit starts. $ Lower burn Higher burn

Break-even chart Revenue Total costs

Which smart window installation expenses are fixed, variable, semi-variable, or semi-fixed?

Cost classification

Break-even is only reliable when each expense follows its real behavior. Here’s the quick math: listed fixed overhead is $10,800/month before semi-fixed fleet and salaried capacity, so labor misclassification can hide the Month 19 break-even risk.

Expense	Cost	Break-Even Treatment	Common Mistake
Showroom and Office Rent	Fixed	Carry $7,500/month in the break-even floor from Month 1 through Month 60.	Spreading rent as a percent of revenue and understating slow-month losses.
Professional Liability Insurance	Fixed	Include $1,400/month as required overhead before counting any project margin.	Leaving insurance out because it does not attach to one job.
CRM and Design Software Subscriptions	Fixed	Model $850/month as recurring overhead needed to quote, design, and manage jobs.	Treating software as optional when it supports every active project.
Smart Glass Hardware and Components	Variable	Apply 18% of revenue in the first year, declining to 16% in the mature year.	Using one flat dollar amount even when project revenue changes.
Project Specific Wiring and Controllers	Variable	Apply 5% of revenue in the first year, declining to 3% by the mature year.	Bundling controllers into fixed overhead instead of job-level margin.
Sales Commissions and Referral Fees	Variable	Apply 4% of revenue each year because it rises with closed sales.	Counting commission after break-even instead of before contribution margin.
Project Labor Overtime and Warranty Visits	Semi-variable	Keep a base labor plan, then add usage-driven hours when jobs run long or service calls rise.	Treating every field hour as salaried overhead or fully variable labor.
Lead Installation Technician Staffing	Semi-fixed	Add capacity in steps: $88,000/year per full-time lead installer as headcount rises.	Treating all labor as variable when salaried crews raise the monthly break-even floor.

How does break-even change from lean launch to base plan and full crew utilization?

Scenario table

Lean launch sits below fixed overhead, so it loses money until volume builds. The base case just clears break-even, and the full case has more cushion because revenue and contribution margin rise.

Planning cases only; actual margins move with mix, labor, and timing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$51K	$15K	$49K	70%	-$22K	Still below break-even; each booked job matters.
Break-even base plan	$69K	$21K	$49K	70%	$0	Covers overhead, but the cushion is thin.
Full utilization	$392K	$99K	$100K	74.8%	$156K	Strong cushion if the commercial mix holds.

What pushes this smart window install business below break-even?

Stress test

Year 1 revenue averages $50.9K/month, below the $74.6K break-even line. Slow sales, one more lead installer, or a margin slip from 70% to 65% can erase the cushion fast, so watch pipeline speed and labor cost.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$74.6K	$0 gap	Only works if sales land on plan.
Revenue shortfall	Year 1 revenue averages $50.9K/month.	$74.6K	$23.7K gap	Sales timing is the first cash risk.
Fixed-cost increase	Add one lead installer at $88K/year.	$85.1K	$34.2K gap	Extra payroll raises the break-even line.
Margin pressure	Variable costs rise from 30% to 35% of revenue.	$80.4K	$29.5K gap	Hardware, wiring, shipping, and commissions squeeze margin.
Combined pressure	Year 1 revenue stays at $50.9K/month, one lead installer is added, and variable costs rise to 35%.	$91.6K	$40.7K gap	Slow sales plus cost creep create a wide cash gap.

Can this smart-window contractor clear break-even before you sign the lease and buy the fleet?

Founder checklist

Before you commit, test whether the pipeline can support the roughly $746K monthly break-even revenue and the $418K cash need through Month 19. If those numbers do not hold, delay the lease, showroom spend, and crew hires.

1Lead Flow$3.5K CAC

Verify you can win qualified jobs at or below the $3,500 Year 1 CAC before you spend the $45,000 marketing budget, because break-even needs steady pipeline, not a launch spike.

2Fixed Load$13.0K/mo

Check that rent, insurance, software, utilities, fleet, and admin stay near the modeled $13,000 a month before you sign the lease, because that cost hits before the first install closes.

3Margin Mix70% CM

Confirm supplier terms keep smart glass hardware at 18% of revenue, wiring and controllers at 5%, logistics at 3%, and sales fees at 4%, or the contribution margin slips and break-even moves out.

4Installer Ramp1→5 FTE

Make sure trained installer capacity can scale before adding the $88,000-a-year technician role, because the model assumes the lead installation team grows from 1.0 FTE to 5.0 FTE by Year 5.

5Runway$418K cash

Keep at least $418,000 of cash on hand, and delay the $75,000 showroom buildout if it shortens runway, because the model does not hit its low point until Month 19.

6Go-Live Kit$209K capex

Verify the vehicle, lifting gear, test tools, demo kits, and warranty process are ready before large custom jobs, since the opening setup ties up about $209,000 across Month 1 to Month 7.