Slurry Wall Construction Break-Even: About $148K Monthly Revenue

Fixed costs $110.4K Opening overhead

Contribution margin 76% After variable costs

Break-even revenue $145.6K Monthly target

Break-even timing Month 1 Launch month

Break-even calculator

This calculator tests monthly revenue, direct project costs, and fixed overhead against break-even for a slurry wall contractor.

Lean Base Full

Monthly revenue Use the monthly contract total before direct costs; it drives the margin available to cover overhead. $ Low volume Peak demand Variable expenses Use direct project costs that move with revenue, like field work, consumables, and project-linked compliance. $ Tight costs Higher costs

Money available to cover fixed costs $1,798,834 $2,391,667 revenue - $592,833 variable expenses

Margin ratio

75%

Covers fixed costs

Yes

Fixed monthly costs Use the monthly overhead base that contribution margin has to cover, even when work slows. $ Lean overhead Heavier overhead

Break-even chart Revenue Total costs

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

Cost classification

Break-even is reliable only if the $45,000/month fixed overhead stays separate from unit-level and revenue-linked job spend. Direct materials move with volume, while project labor and equipment support move in steps.

Expense	Cost	Break-Even Treatment	Common Mistake
Heavy Equipment Storage Yard Rent	Fixed	Include $12,000 per month in fixed overhead for the planning range.	Allocating yard rent per unit and making break-even look better at higher volume.
Professional Liability Insurance	Fixed	Carry $15,000 per month as fixed overhead from Month 1 through Month 60.	Treating it like a job premium that disappears when projects pause.
Bentonite Powder Mix	Variable	Apply the $12.00 per-unit allowance to each produced unit.	Using one monthly estimate instead of tying mix usage to field volume.
Slurry Disposal Fees	Variable	Apply the $6.00 per-unit allowance as production rises.	Ignoring disposal charges that rise with difficult sites and more slurry handling.
Project Bonding and Performance Insurance	Variable	Apply 3.0% of first-year revenue; $17.95M × 3.0% = $538,500.	Entering it as a flat monthly premium instead of a revenue-linked project charge.
Sales Commissions and Business Development	Variable	Apply 2.0% of first-year revenue; $17.95M × 2.0% = $359,000.	Burying commissions inside fixed marketing and overstating contribution margin.
Equipment Maintenance Reserve	Semi-variable	Treat owned equipment as needing ongoing support, with the modeled reserve at 2.0% of revenue.	Treating owned equipment as free after purchase and missing usage-driven repairs.
Senior Project Manager Staffing	Semi-fixed	Add capacity in steps: 1.0 FTE in the first year, 2.0 in Year 2, 3.0 in Year 4, and 4.0 in Year 5.	Putting all labor in fixed overhead instead of adding managers when project load expands.

How does break-even shift from a lean slurry-wall month to a full-capacity backlog?

Scenario table

Lean months sit near break-even, base months clear it, and full-capacity months build a wide cushion. The swing comes from revenue scaling faster than variable spend, while fixed overhead and added crew rise more slowly.

Planning cases only; they exclude debt service, taxes, retainage, and capex cash timing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean one-job month	$148K	$37K	$110K	74.8%	$1K	One short month can wipe out the cushion.
Base Year 1 pipeline month	$1.496M	$377K	$110K	74.8%	$999K	Normal demand clears break-even and funds growth.
Full-capacity backlog month	$3.467M	$774K	$221K	77.7%	$2.472M	Strong backlog gives a wide cushion, even with more crew.

What breaks the break-even plan for a slurry wall contractor?

Stress test

Base monthly revenue is about $1.496M against $377K variable and $110K fixed, so break-even is only about $147K. Revenue misses hurt less than fixed-cost creep and margin loss from idle crews or remobilization.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$147K	$1.349M cushion	Healthy cushion, but it depends on steady starts.
Revenue shortfall	Monthly revenue falls 10% to about $1.346M.	$147K	$1.199M cushion	Still above break-even, but bid delays cut into slack.
Fixed-cost pressure	Fixed overhead rises 20% to about $132K per month.	$177K	$1.319M cushion	Yard rent, software, and insurance lift the floor fast.
Margin pressure	Variable spend rises 10% to about $414K per month.	$153K	$1.343M cushion	Fuel, spoil, and wear push break-even higher without new revenue.
Combined pressure	Revenue falls 10%, variable spend rises 10%, and fixed overhead rises 20%.	$191K	$1.155M cushion	Still profitable, but idle crews and remobilization can erode cash.

What should the founder verify before committing to the trench cutter, crane, and yard?

Founder checklist

Don't sign the yard lease or buy major equipment until signed or highly probable backlog can carry the full Month 6 overhead load. The model shows a $467K cash dip, so timing, staffing, and capex all have to line up before break-even is believable.

1Backlog Cover$17.95M

Verify signed or highly probable backlog can carry the Year 1 revenue plan, because the model says break-even starts in Month 1 and that only works if the first large project starts on time.

2Bid Adders$27-$37/unit

Price disposal, slurry recycling, hazardous handling, access, staging, and demobilization into each bid, because the model's unit adders run from $27 to $37 and thin quotes will miss break-even.

3Overhead Load$110.4K/mo

Add the full monthly run rate before you hire or lease more space: fixed costs plus Year 1 payroll come to about $110.4K a month.

4Crew Ready6.0 FTE

Confirm the opening crew is ready before mobilization: lead engineer, project manager, two certified operators, quality control, and safety coverage keep the trench cutter from sitting idle.

5Launch Capex$5.755M

Verify the $5.755M buildout and the bonding or performance insurance budget at 30% of Year 1 revenue are both funded before you order steel or sign the yard.

6Cash Trough($467K)

Keep reserve or committed liquidity for the Month 6 trough, because minimum cash is negative $467K and the 8-month payback depends on one large project starting on schedule.