Air-Supported Structure Installation Break-Even: $161K/Month

Fixed costs $29.1K/mo Core overhead

Contribution margin 70.5% After variable costs

Break-even revenue $41.3K/mo Monthly target

Break-even timing Month 6 Model break-even

Break-even calculator

Test whether monthly revenue can cover variable expenses and fixed monthly costs for an air-supported structure installer.

Lean Base Full

Monthly revenue Revenue sets the pool that covers variable and fixed costs. $ Low volume Peak volume Variable expenses Use direct project costs, subcontracted labor, logistics, and sales fees. $ Thin costs Heavy costs

Money available to cover fixed costs $331,830 $462,167 revenue - $130,337 variable expenses

Margin ratio

72%

Covers fixed costs

Yes

Fixed monthly costs This is the overhead that contribution margin must cover each month. $ Lean overhead Large overhead

Break-even chart Revenue Total costs

Which air-supported structure installation expenses are fixed, variable, semi-variable, or semi-fixed at break-even?

Cost classification

Classification keeps the Month 6 break-even credible: fixed costs set the base, variable costs reduce contribution, and semi-fixed crew costs move in hiring steps. Misclassifying idle crew time as direct project work makes margin look too clean.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse and Office Rent	Fixed	Use the $12,500 monthly rent as fixed overhead in the break-even base.	Allocating rent to each job and understating the monthly hurdle.
Insurance and Liability Coverage	Fixed	Include the $4,200 monthly premium before calculating project contribution.	Treating insurance as job-specific even when it runs every month.
Professional CRM and ERP Software	Fixed	Carry the $1,800 monthly software charge as fixed operating overhead.	Linking software spend to sales volume instead of the operating platform.
Direct Project Materials and Hardware	Variable	Model as 14.0% of revenue in the first year, falling to 12.0% by the mature year.	Using a flat monthly budget instead of tying materials to project revenue.
Subcontracted Specialized Labor	Variable	Apply 10.0% of revenue in the first year, declining to 8.0% by the mature year.	Blending subcontract labor with salaried crew and hiding true contribution.
Project Logistics and Travel	Variable	Use 3.0% of revenue in the first year, stepping down to 2.2% as routing improves.	Ignoring travel overages on remote or multi-day installation jobs.
Installation Technician Payroll	Semi-fixed	Step payroll with crew capacity, from 6.0 FTEs in the first year to 20.0 FTEs by the mature year.	Treating idle crew time as a direct project expense.
Fleet Maintenance and Fuel	Semi-variable	Keep the $3,500 monthly base in overhead, then flex usage with job load and site miles.	Modeling all fleet spend as fixed when fuel rises with field activity.

How does break-even change across lean, base, and full booking levels?

Scenario table

Here’s the quick math: fixed payroll and overhead set the floor, while direct project costs stay near 28% to 30% of revenue. So the lean case slips under cover, and the Year 1 and Year 2 average cases both clear it.

Planning assumptions only; actual break-even will move with crew utilization, project mix, and timing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean opening-month case	$150,000	$44,250	$113,300	70.5%	-$7,550	Below break-even; one slow crew week can push it negative.
Base Year 1 average case	$249,833	$73,701	$113,300	70.5%	$62,832	Above break-even, with a modest cushion if crews stay booked.
Full Year 2 fuller-utilization case	$462,167	$130,331	$140,800	71.8%	$191,036	Well above break-even; the margin widens if utilization stays high.

What breaks the break-even plan for this installation business?

Stress test

The base plan has room, but not a lot of it. A 20% revenue slip still stays above break-even, while a 10% fixed-cost rise or a 5-point margin squeeze each shave about half a million of cushion; the combined case turns into a monthly gap.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$2,377k	$621k cushion	The base plan clears break-even, but Month 6 is still the pinch point.
Revenue shortfall	Revenue slips 20% to $1,999k.	$1,723k	$276k cushion	Lower signed volume still covers fixed load, but the buffer gets thin.
Fixed-cost rise	Fixed costs rise 10% to about $1,246k a year.	$2,483k	$515k cushion	Higher rent, insurance, and fleet costs eat into slack fast.
Margin pressure	Variable expense rate rises from 29.5% to 34.5%.	$2,495k	$503k cushion	Fuel, overtime, and subcontracting can cut the cushion in half.
Combined pressure	Revenue falls 30%, variable rate hits 34.5%, and fixed costs rise 10%.	$2,219k	$120k gap	The plan flips to a cash gap, so signed installs and labor timing matter.

What should the founder verify before signing the warehouse lease and buying major installation gear?

Founder checklist

Don’t lock the lease or order big equipment until signed work can carry the Month 6 break-even path. The model needs a $168K cash floor and a staged capex plan, so the commitment has to match real backlog, not just interest.

1Signed work$250K/mo

Verify near-term signed revenue can hold this run rate before you commit to the lease and larger crew.

2Fixed burn$100.8K/mo

Make sure the warehouse, office, fleet, software, utilities, insurance, and marketing base stays inside this monthly hurdle.

3Margin check20.7%

Keep pricing and subcontracted labor close to plan, because the first-year EBITDA margin is only about one-fifth of revenue.

4Crew ramp6 tech FTE

Hire installation technicians only when booked hours fill the schedule, since the plan scales from 6 to 20 FTE and early over-hiring burns cash.

5Cash floor$168K

Hold this minimum cash for Month 6 and do not spend the full $610K capex plan upfront, or equipment buys can outrun collections.

6Launch timingMonth 6

Confirm domes, anchoring hardware, inflation systems, rigging gear, lifts, site access, weather windows, and insurance are ready before crews mobilize.