Airport Construction Break-Even Analysis: $136K Per Month

Fixed costs $25.2K/mo Overhead base

Contribution margin 69% After variable costs

Break-even revenue $36.5K/mo Cover overhead

Break-even timing Month 8 Model break-even

Break-even calculator

Test how monthly revenue, variable expenses, and fixed costs shape break-even for airport construction work.

Lean Base Full

Monthly revenue More revenue gives you more room to cover fixed overhead. $ Low sales High sales Variable expenses These are direct project costs that rise with revenue. $ Light direct costs Heavy direct costs

Money available to cover fixed costs $192,950 $275,643 revenue - $82,693 variable expenses

Margin ratio

70%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead contribution margin has to cover. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which airport construction expenses are fixed, and which move with sales?

Cost classification

For runway, terminal, control tower, and consulting bids, break-even only works if job-driven spend stays separate from overhead. Here’s the quick split: variable items follow revenue, fixed items hit before awards, and payroll rises in staffing steps.

Expense	Cost	Break-Even Treatment	Common Mistake
Direct Project Materials & Equipment Rental	Variable	Use 12% of first-year revenue in break-even math.	Don’t bury equipment rental in office overhead.
Specialized Subcontractor Fees	Variable	Use 8% of first-year revenue for project-specific outside work.	Don’t treat every subcontract as fixed payroll.
Project-Specific Travel & Accommodation	Variable	Use 5% of first-year revenue and tie it to active jobs.	Don’t spread job travel across all months evenly.
Client Relations & Bid Preparation Costs	Variable	Use 6% of first-year revenue to reflect pursuit activity.	Don’t ignore bid costs before the contract is won.
Office Rent & Utilities	Fixed	Include $15,000 per month before project awards.	Don’t wait to count rent until revenue starts.
General Insurance & Permits	Fixed	Include $2,500 per month as general overhead.	Don’t mix general coverage with project-specific items.
Accounting & Legal Services	Fixed	Include $3,000 per month in the base overhead load.	Don’t move routine admin support into job margin.
Salaried Leadership and Technical Staff	Semi-fixed	Use $770,000 for first-year payroll, then step up as FTEs rise.	Don’t model payroll as a smooth percentage of revenue.

How does break-even shift across lean, base, and full airport contract loads?

Scenario table

More signed work lifts revenue faster than the fixed payroll and office load. With a 69% contribution margin, the first year still needs enough active equivalents to get past the fixed cost line.

Planning assumptions only; actual results will move with backlog timing, subcontractor pricing, and billing cadence.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean airport contract mix	$1,026K	$318K	$935K	69%	-$227K	Still below break-even; one slow month leaves a gap.
Base airport contract mix	$1,538K	$477K	$935K	69%	$126K	Just over break-even; enough cushion if billing stays on time.
Full airport contract mix	$2,564K	$795K	$935K	69%	$834K	Strong cushion; break-even risk drops once the subcontractor bench is in place.

What breaks first if awards slip or costs rise?

Stress test

The plan clears break-even only if awards land on time and later-year margins show up. One slipped project, a building information modeling (BIM) hire, or a stuck 31% variable load can turn the cushion into a gap.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$1,412K	$126K cushion	The base case has only a thin cushion.
Revenue shortfall	One active equivalent slips and revenue falls to $1,026K.	$1,254K	$228K gap	A single award delay erases the cushion.
Fixed-cost pressure	Add one building information modeling (BIM) Specialist / CAD Engineer at $95K a year.	$1,491K	$47K cushion	Extra staff pushes break-even closer to current revenue.
Margin pressure	Year 1 variable load stays at 31% instead of easing toward 26% by Year 5.	$1,489K	$49K cushion	Margin gains fail to show, so contribution stays weak.
Combined pressure	One project slips and the BIM hire starts anyway.	$1,333K	$307K gap	Delayed awards plus added staff turn the model cash-tight fast.

Is the airport contractor ready to lock office or yard space before backlog, cash, and crews are proven?

Founder checklist

Don’t sign the office or yard lease until signed or highly probable backlog can carry the fixed load. The model needs about $1.356M in monthly billings to cover overhead, and cash still bottoms near $147K in Month 8.

1Backlog Cover$1.356M/mo

Confirm backlog at this level before you commit to space, because lower billings leave no real cushion on a fixed airport build team.

2Fixed Load$25.2K/mo

Check that rent, utilities, insurance, legal, IT, software, training, and supplies fit the plan, since this burn starts before project revenue stabilizes.

3Margin Check69% CM

Verify launch work still leaves about 69% contribution after materials, subcontractors, travel, and bid prep, or break-even will slide out fast.

4Crew RampMonth 13

Line up subcontractors before specialty airside work starts, because the BIM Specialist / CAD Engineer only enters in Month 13 and the rest of the team ramps later.

5Cash Floor$147K

Keep this reserve through Month 8, because that is the model’s cash trough and breakeven point, and capex lands before the business settles.

6Bid Funnel$50K / $10K CAC

Verify bonding capacity and airport owner prequalification before you add bid staff, because the Year 1 marketing budget and CAC only matter if awards can close.