Koi Pond Design-Build Break-Even: About $55k Monthly Revenue

Fixed costs $7.9K Monthly overhead

Contribution margin 73% After variable costs

Break-even revenue $10.8K Monthly target

Break-even timing Month 20 Model crosses over

Break-even calculator

Test monthly revenue, variable expenses, and fixed monthly costs against break-even.

Lean Base Full

Monthly revenue Revenue sets the pool that covers variable costs and fixed overhead. $ Lower sales Higher sales Variable expenses These are direct job costs that rise as project volume grows. $ Lower costs Higher costs

Money available to cover fixed costs $100,383 $132,083 revenue - $31,700 variable expenses

Margin ratio

76%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead the margin has to cover. $ Lean overhead Heavier overhead

Break-even chart Revenue Total costs

Which koi pond design and construction expenses are fixed, and which move with sales?

Cost classification

Break-even gets risky when job-linked costs are treated like overhead. With break-even in Month 20 and first-year EBITDA at -$189k, the model needs each pond job to carry its true materials, fuel, labor capacity, and disposal load.

Expense	Cost	Break-Even Treatment	Common Mistake
Design Studio and Storage Rent	Fixed	Treat the $4,500 monthly rent as a base revenue hurdle before job margin can cover profit.	Allocating rent only to construction jobs and understating maintenance service margin.
Liability and Equipment Insurance	Fixed	Include the $1,200 monthly premium in fixed overhead for every operating month.	Assuming insurance falls when project volume drops.
3D Modeling Software Subscriptions	Fixed	Carry the $600 monthly subscription as stable overhead supporting design capacity.	Burying software inside billable labor and losing overhead visibility.
Salaried Design, Installation, and Maintenance Team	Semi-fixed	Model payroll in staffing blocks; first-year salaries include the manager, designer, two installers, and one maintenance technician.	Treating install labor as fully variable instead of capacity added in steps.
Raw Materials and Livestock	Variable	Reduce job margin by 14.0% of revenue in the first year, declining to 12.0% by the fifth year.	Pricing ponds from labor hours while leaving fish, plants, stone, and filtration parts out of margin.
Specialized Subcontracting Fees	Variable	Apply subcontracting as a direct revenue-linked charge, starting at 6.0% of revenue in the first year.	Parking specialty work in overhead and overstating project contribution.
Vehicle Fuel and Maintenance	Semi-variable	Track the usage-linked portion against job volume, with first-year planning at 4.0% of revenue.	Ignoring fuel by site distance and treating every service route as equal.
Site Waste Disposal Fees	Variable	Charge disposal against job margin, starting at 3.0% of revenue in the first year.	Excluding disposal from estimates and finding the shortfall after the pond is built.

How does break-even change as the koi pond mix shifts from lean to full scale?

Scenario table

Lean Year 1 still runs short because fixed payroll and shop costs outrun the project mix. By Year 2 the model reaches break-even, and Year 3 adds cushion as maintenance and upgrades take a bigger share.

Planning case only; actual results will move with close rate, crew use, and job mix.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean opening-year install mix	$39.5k	$17.4k	$37.8k	55.8%	-$15.8k	The project mix still misses fixed payroll and shop load.
Base Year 2 break-even mix	$85.6k	$33.2k	$52.4k	61.2%	$0	This is the line where overhead is covered.
Full Year 3 mix with more maintenance	$132.1k	$47.7k	$62.2k	64.0%	$22.3k	Recurring work adds a cushion after fixed costs.

What breaks the break-even plan for a koi pond business?

Stress test

The base plan sits right on break-even at about $547k of annual revenue, so there’s no cushion. A 15% sales dip, a 10% overhead jump, or a 5-point margin squeeze can each push it into loss; stacked together, the gap gets much bigger.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change; revenue stays about $547k.	$547k	$0 cushion	Right on break-even; no room for misses.
Revenue shortfall	Revenue slips 15% to about $465k.	$547k	$82k gap	That drop leaves about $60k short of overhead.
Fixed-cost rise	Overhead rises 10% to about $439k.	$602k	$55k gap	Higher overhead needs more sales to stay covered.
Margin squeeze	Variable expenses rise 5 points to 32% of revenue.	$587k	$40k gap	A 5-point margin hit creates about $27k of loss.
Combined pressure	Revenue slips 15%, overhead rises 10%, and variable expenses rise 5 points.	$646k	$181k gap	Stacked pressure pushes the model about $123k underwater.

Can you prove enough booked koi pond work before you commit to the lease and crew?

Founder checklist

Don’t lock in the studio lease, truck buys, or full crew until signed or near-signed work can cover the first fixed-cost load. This model breaks even in Month 20, needs about $515K of minimum cash, and doesn’t pay back until Month 44, so demand has to be real before you scale.

1Booked Pipeline$474K Yr 1

Confirm near-signed work can get you to the $474K first-year revenue path before you add more overhead, because Year 1 EBITDA is still negative $189K.

2Core Burn$37.8K/mo

Check that revenue can cover the $37.8K monthly fixed load from rent, insurance, software, admin, dues, and payroll, because that is the burn rate before growth.

3Direct Cost73% CM

Verify raw materials and livestock at 14%, subcontracting at 6%, fuel at 4%, and disposal at 3% stay near plan, or contribution margin falls below what payroll needs.

4Crew Capacity$172K gear

Make sure the crew can keep the $172K truck, excavator, tools, and testing-kit stack busy, or the cash tied up in equipment will sit idle before revenue steadies.

5Cash Buffer$515K

Hold at least $515K in reserve through Month 20, because that is the cash trough before break-even and the business still needs time to turn earnings into payback.

6Acquisition Cost$2.5K CAC

Only scale the $25K first-year marketing budget if a booked project can absorb a $2,500 CAC, or you’ll buy leads faster than the pipeline turns into cash.