Diaphragm Wall Construction Break-Even: $192K Monthly Revenue

Fixed costs $142.1K/mo Monthly overhead base

Contribution margin 73% After variable costs

Break-even revenue $194.7K/mo Monthly target

Break-even timing Month 1 First break-even month

Break-even calculator

Test monthly revenue, variable expenses, and fixed costs against break-even for diaphragm wall construction.

Lean Base Full

Monthly revenue Revenue sets the margin pool that must cover direct job costs and overhead. $ Lower sales Higher sales Variable expenses These are direct costs that move with each project, like materials, labor, and project fees. $ Lower direct cost Higher direct cost

Money available to cover fixed costs $5,109,742 $6,145,667 revenue - $1,035,925 variable expenses

Margin ratio

83%

Covers fixed costs

Yes

Fixed monthly costs These are monthly overhead costs you pay even when bookings slow. $ Lean overhead Larger overhead

Break-even chart Revenue Total costs

Which diaphragm wall expenses are fixed, variable, semi-variable, or semi-fixed for break-even?

Cost classification

Your break-even is reliable only when monthly overhead stays separate from job-level spend. Keep leases, rent, insurance, and salaried management fixed; push concrete, rebar, slurry, labor, commissions, and bonding through contribution margin.

Expense	Cost	Break-Even Treatment	Common Mistake
Heavy Equipment Yard Lease	Fixed	Include $15,000 per month from Month 1 through Month 60 before calculating job margin coverage.	Treating idle rigs as variable even though the yard still burns cash.
Corporate Office Rent	Fixed	Include $8,500 per month as base overhead across the monthly planning range.	Scaling office rent with wall footage instead of keeping it in fixed overhead.
General Liability Insurance	Fixed	Include $12,000 per month even when crews are between active pours.	Dropping insurance from break-even because it is not tied to one job.
Salaried Management Payroll	Fixed	Include recurring leadership and management salaries as overhead unless a role is billed directly to a project.	Loading all senior payroll into job margin and overstating contribution.
High Strength Concrete	Variable	Apply the $25.00 unit input to each standard wall unit produced.	Averaging concrete into overhead instead of matching it to production volume.
Reinforcing Steel Rebar	Variable	Apply the $18.00 unit input to each standard wall unit produced.	Using one annual steel estimate and missing margin swings as volume changes.
Project Referral Commissions	Variable	Calculate at 3.0% of revenue in the first year and mature year.	Modeling commissions as fixed selling expense when they move with sales.
Equipment Maintenance Reserve	Semi-fixed	Model as a capacity-linked reserve that rises when fleet use, crews, or operating scale step up.	Treating maintenance as fully variable and ignoring baseline upkeep on owned equipment.

How does break-even move from lean to base to full operating cases for this diaphragm wall contractor?

Scenario table

Lean work clears break-even fast because fixed crews and yard costs are already covered. As the mix broadens and Year 5 staffing steps up, margin stays strong, but backlog and rig use matter more.

Planning assumptions only; actual break-even will move with awarded mix, utilization, and delay risk.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean: Standard wall only	$1.69M	$442K	$142K	73.8%	$1.10M	Revenue sits far above break-even, so the key risk is low rig use.
Base: Year 1 mixed backlog	$3.51M	$911K	$142K	74.0%	$2.46M	This is the core case: margin easily covers fixed overhead and leaves a wide cushion.
Full: Year 5 scaled backlog	$9.96M	$2.30M	$252K	76.9%	$7.41M	Higher volume and higher staffing still leave a very wide cushion if backlog holds.

What pushes the break-even plan off track in diaphragm wall construction?

Stress test

At a $3.51M Year 1 monthly run rate, about $142K of fixed overhead, and roughly 74% contribution margin, the plan has a wide cushion. The real break-even risk is idle equipment, delayed concrete pours, and rebar or bonding cost pressure hitting at the same time.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$192K	$3.32M cushion	Strong cushion, but idle plant still eats margin.
Revenue shortfall	Monthly revenue falls 10% from the Year 1 run rate.	$192K	$2.97M cushion	Slower mobilizations cut cushion, but the model still clears break-even.
Fixed-cost increase	Monthly overhead rises by $10K.	$206K	$3.30M cushion	Idle yard, office, or insurance costs lift the break-even bar fast.
Margin pressure	Contribution margin falls 5 points to 69%.	$206K	$3.30M cushion	Rebar, concrete, and bonding cost creep can squeeze each job quickly.
Combined pressure	Revenue falls 10%, overhead rises $10K, and margin falls 5 points.	$220K	$2.94M cushion	Gaps between mobilizations plus cost spikes can erode cash fast.

What should you verify before you commit to the yard lease and heavy equipment?

Founder checklist

Don’t lock the yard lease or buy the major equipment until backlog, cash, and pricing all clear the bar. The model says Month 1 minimum cash need is $872K, so the first jobs have to be lined up before fixed spend starts.

1Backlog proofBefore Month 1

Verify signed or near-award work is in hand before the $15K yard lease and $12K general liability insurance start, because this business cannot carry that fixed burn on hope.

2Fixed burn$49.2K/mo

Check that opening fixed costs really sum to about $49.2K a month from yard, office, IT, marketing, professional services, and insurance, since that is the burn you fund before revenue lands.

3Equipment stack$4.04M

Verify the launch capex covers the $1.85M trench cutter, $950K crawler crane, $420K desanding plant, and $280K slurry units, plus the rest of the setup, or capacity will be stranded.

4Cash cushion$872K

Confirm you have at least the Month 1 minimum cash need of $872K, because that is the model’s first cash low point and the business is not ready without it.

5Bid margin74% CM

Check that Year 1 pricing still clears direct job costs and the 3.0% referral plus 2.5% bonding charges, so the contribution margin, the dollars left after direct costs, still covers overhead.

6Launch ramp$1.115M payroll

Verify the Year 1 salaried team can run at about $1.115M before field crews, and that mobilization windows, permits, site access, water treatment, and disposal capacity are ready before ramp-up spend.