Concrete Crack Injection Repair Break-Even: $42K Monthly Target

Fixed costs $30.0K/mo Year 1 base

Contribution margin 71% After job costs

Break-even revenue $42.3K/mo Monthly target

Break-even timing Month 5 Model break point

Break-even calculator

Check whether monthly revenue from crack repair covers variable costs and the fixed cost base.

Lean Base Full

Monthly revenue Revenue is the top line that pays variable costs and then fixed costs. $ Slow month Busy month Variable expenses Use direct costs that rise with work done, like materials, fuel, and referral fees. $ Lean costs Higher costs

Money available to cover fixed costs $130,247 $178,917 revenue - $48,670 variable expenses

Margin ratio

73%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base your contribution margin has to cover. $ Lower overhead Higher overhead

Break-even chart Revenue Total costs

Which concrete crack repair expenses are fixed, and which move with sales?

Cost classification

Treat rent, insurance, software, utilities, accounting, and maintenance as fixed overhead; keep materials, fuel, and referrals job-driven. Variable items total 29%, so contribution margin is 71% before fixed overhead and semi-fixed spend.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse and Office Rent	Fixed	Add $3,500/month to fixed overhead from Month 1 through Month 60.	Spreading rent across jobs and lowering it when volume dips.
General Liability Insurance	Fixed	Add $850/month to fixed overhead; it doesn't move with each repair invoice.	Treating insurance as a job fee.
Salaried Field and Admin Team	Semi-fixed	Year 1 payroll is $243,500/year, about $20,292/month; raise it only when FTEs step up.	Modeling every labor dollar as hourly variable labor.
Annual Marketing Budget	Semi-fixed	Budget $45,000/year, or $3,750/month, then track CAC separately at $450 in Year 1.	Cutting marketing automatically when monthly sales miss plan.
Injection Resins and Materials	Variable	Apply 14% of revenue in Year 1 as direct job material use.	Treating bulk resin purchases as fixed overhead.
Disposables and Consumables	Variable	Apply 4% of revenue in Year 1 as job-level consumable use.	Ignoring small items because each ticket looks minor.
Vehicle Fuel and Maintenance	Variable	Apply 6% of revenue in Year 1 because truck use follows job volume.	Putting fuel in overhead instead of per-job economics.
Referral Commissions	Variable	Apply 5% of revenue when referrals drive sold work; include it before contribution margin.	Counting referred revenue at full margin.

How does break-even change from a lean epoxy-led launch to a base plan and a full operating build?

Scenario table

Higher revenue helps, but so do lower variable costs and tighter staffing use. As technicians, marketing, and truck use scale up, break-even moves higher in dollars, while the profit cushion also grows.

These are planning assumptions built from the model inputs, not guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean epoxy-led launch	$72.2k	$20.9k	$30.0k	71%	$21.2k	Above break-even, but the cushion is still thin.
Base mixed-service plan	$135.4k	$38.1k	$38.6k	71.9%	$58.7k	Break-even is covered with a solid monthly buffer.
Full route-density build	$285.5k	$72.5k	$67.8k	74.6%	$145.2k	Strong cushion; added scale still clears fixed costs by a wide margin.

What breaks the break-even plan for concrete crack injection repair?

Stress test

The base plan clears break-even, but the cushion tightens fast if booked work slows or costs creep up. A 20% revenue drop still works, yet higher variable spend or fixed overhead pushes the model much closer to the line.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	Year 1 revenue stays near $722,000.	$422,000	$300,000 cushion	Base plan clears break-even with room.
Revenue shortfall	Booked revenue drops 20% to about $578,000.	$422,000	$156,000 cushion	Still above break-even, but sales softness cuts the buffer.
Fixed-cost pressure	Fixed overhead rises 10% to about $330,000.	$465,000	$257,000 cushion	Higher rent, insurance, or staffing pushes break-even up.
Margin pressure	Variable expenses rise from 29% to 34% of revenue.	$455,000	$267,000 cushion	More resin, fuel, and callbacks squeeze contribution margin.
Combined pressure	Revenue falls 20%, variable expenses rise to 34%, and fixed costs reach $330,000.	$500,000	$77,000 cushion	Only a thin cushion remains; operating cushion is about $51,000.

Can this crack-injection business clear break-even before you sign the lease and hire the first crew?

Founder checklist

Test the Year 1 price mix, CAC, cash, and field capacity before you commit to the lease and equipment. If bookings or margin slip, the Month 5 break-even plan gets tight fast.

1Price Mix$225/$195/$150

Verify the opening mix is 65% epoxy, 25% polyurethane, and 10% reports, and that the Year 1 rate card stays at $225, $195, and $150 per hour, because any discounting cuts the cash per job.

2CAC Check$450 CAC

Check that the $45K Year 1 marketing budget can still buy work at a $450 CAC, because that only supports 100 customer wins and the pipeline has to fill trucks fast enough.

3Fixed Load$26.2K/mo

Use the opening fixed base of about $26.2K a month before owner pay, taxes, debt service, or reserves, because the monthly job flow has to clear that floor before anything else pays you back.

4Gross Margin71% CM

Confirm job-level contribution margin stays near 71% in Year 1 after resin, consumables, fuel, and referral fees, because even small slippage makes the lease and payroll load harder to cover.

5Cash Trough$796K

Hold enough cash to cover the Month 2 trough of $796K, since capex lands early and the model does not reach breakeven until Month 5.

6Field Capacity6.5 hrs

Verify the crew, pump readiness, safety gear, rework process, and drive-time plan can support 6.5 billable hours per active customer each month, because field delays are what usually break the schedule first.