Fiberglass Insulation Contractor Break-Even Analysis: ~$50K/Month

Fixed costs ≈$31.6K/mo Base burn

Contribution margin 70.5% After variable costs

Break-even revenue ≈$44.8K/mo Cover monthly burn

Break-even timing Month 4 Launch ramp

Break-even calculator

Use this calculator to test monthly revenue against variable costs and fixed monthly overhead.

Lean Base Full

Monthly revenue Revenue from installed work drives the margin left for overhead. $ Lower sales Higher sales Variable expenses Use direct costs that rise with each job, like materials, fuel, supplies, and subcontractors. $ Lower costs Higher costs

Money available to cover fixed costs $406,732 $557,167 revenue - $150,435 variable expenses

Margin ratio

73%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base that contribution margin has to cover. $ Lean overhead Heavier overhead

Break-even chart Revenue Total costs

Which insulation contractor expenses are fixed, and which move with sales?

Cost classification

Break-even is only useful if job-level spend stays out of overhead. In the first year, variable job inputs total 29.5% of revenue, so misclassifying them can make Month 4 break-even look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Fiberglass Insulation Materials	Variable	Model at 18.0% of first-year revenue, or about $330,480 on $1.836 million.	Burying materials in overhead instead of tying them to installed work.
Installation Supplies and Equipment	Variable	Model at 6.5% of first-year revenue, or about $119,340, and track by install.	Using one flat monthly estimate when install volume changes.
Fuel and Vehicle Operating Costs	Variable	Model at 3.8% of first-year revenue, or about $69,768, because routing and job count drive spend.	Treating route-heavy months like average months.
Project-Based Subcontractor Costs	Variable	Model at 1.2% of first-year revenue, or about $22,032, and assign to specific jobs.	Spreading subcontractor spend across all jobs equally.
Office and Warehouse Rent	Fixed	Keep at $4,200 per month for the Month 1 to Month 60 planning range.	Assigning rent to each job as if it disappears when sales dip.
Business Insurance	Fixed	Keep at $2,800 per month unless the policy changes with fleet, payroll, or coverage limits.	Leaving insurance out of monthly break-even overhead.
Equipment Maintenance and Repairs	Semi-variable	Plan at $850 per month, but expect spikes when equipment usage rises.	Assuming repairs stay smooth while crews and jobs scale.
Lead and Installation Technician Payroll	Semi-fixed	Year 1 crew payroll is $161,000 per year, or about $13,417 per month, before higher staffing steps.	Treating salaried installer payroll as fully variable per job.

How does break-even change from lean launch to full utilization for a fiberglass insulation contractor?

Scenario table

Break-even shifts mainly with monthly revenue and payroll. As estimating, supervision, admin, and marketing roles are added, fixed costs rise, so the business needs more billed hours to keep the same cushion.

Planning assumptions only; actual break-even will move with job mix, pricing, and staffing timing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$153,000	$45,135	$35,560	70.5%	$72,305	Close to early break-even; keep the mix heavy on residential and new construction.
Base growth case	$557,167	$150,435	$74,226	73.0%	$332,506	Clear cushion, but crew and overhead steps still need enough booked hours.
Full utilization case	$1,332,917	$329,230	$126,227	75.3%	$877,460	Strong cushion, yet idle crews or slow scheduling can still pressure profit.

What breaks the break-even plan if jobs slow down or costs climb?

Stress test

The plan clears break-even now, but the cushion shrinks fast if booked revenue slips or crews spend more time on travel and rework. A 20% sales dip still holds, yet a 5-point margin hit and 15% higher overhead tighten the base.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$50,400	$102,600 cushion	Wide buffer now, so volume is the main gate.
Revenue shortfall	Booked revenue falls 20% to $122,400.	$50,400	$72,000 cushion	Still above break-even, but the slack is thinner.
Fixed-cost increase	Fixed overhead rises 15% to about $40,900.	$58,000	$95,000 cushion	Overhead pressure lifts break-even, but not sharply.
Margin pressure	Variable expenses rise 5 points to 34.5%.	$54,300	$98,700 cushion	More fuel, labor, or rework cuts the margin fast.
Combined pressure	Revenue falls 20%, variable expenses rise to 34.5%, and fixed costs rise 15%.	$62,400	$60,000 cushion	If booked revenue gets near $62,400, margin can vanish fast.

Is the booked-job pipeline strong enough to justify the lease, vehicles, and first crew?

Founder checklist

Don’t sign the lease, buy vehicles, or add salaried staff until booked work, mix, and cash all match the Year 1 model. Break-even lands in Month 4, but cash bottoms in Month 2, so the calendar has to lead the spend.

1Booked PipelinePre-hire

Verify enough signed jobs are on the calendar before hiring ahead of demand, because break-even only holds if work starts before payroll ramps.

2Year 1 Mix45/35/15/5

Check that residential retrofit, new construction, commercial installation, and removal really track the Year 1 mix, since the revenue model depends on that split.

3Direct Margin70.5%

Confirm pricing still clears the Year 1 direct cost load of 29.5% so the job mix can cover fixed overhead and still leave room for profit.

4Crew Ramp3.0 FTE

Make sure the first crew size can absorb the booked workload before you add more salaried staff, or labor will outrun revenue.

5Cash Cushion$748K

Stress-test the launch capex of $145.5K against the Month 2 cash trough and the $11.06K monthly fixed load so you do not run out of runway early.

6Supplier Access$15K

Secure materials access before the first $15,000 inventory buy, because jobs slip fast when supply is not ready when the crew is.