Home Rainwater Harvesting Break-Even Revenue: $43K/Month

Fixed costs $35.9K/mo Overhead plus payroll

Contribution margin 83% After variable costs

Break-even revenue $43.2K/mo Monthly target

Break-even timing Month 13 Model crossover

Break-even calculator

Test whether monthly revenue covers variable costs and fixed overhead for a residential rainwater harvesting service.

Lean Base Full

Monthly revenue Revenue sets how much margin is available to cover fixed costs. $ Low sales High sales Variable expenses These are direct costs that rise with each install and plan sold. $ Low costs High costs

Money available to cover fixed costs $155,199 $183,925 revenue - $28,726 variable expenses

Margin ratio

84%

Covers fixed costs

Yes

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

Break-even chart Revenue Total costs

Which expenses are fixed, and which move with sales for a residential rainwater harvesting service?

Cost classification

Break-even is cleaner when stable overhead stays fixed and job-linked items move with revenue. In the first year, fixed overhead is $8,150/month before payroll, while listed variable items total 17.0% of revenue.

Expense	Cost	Break-Even Treatment	Common Mistake
Office & Warehouse Rent	Fixed	Include $4,000/month in fixed overhead for the planning range.	Spreading rent across each installation and hiding the base burn.
Utilities	Fixed	Include $600/month as fixed in this model.	Treating basic utilities as job-level spend without usage data.
Vehicle Fleet Fixed Costs	Fixed	Include $1,200/month as fixed capacity expense.	Mixing fixed fleet charges with fuel used on installations.
Payroll	Semi-fixed	Model salaries as fixed until headcount steps up with volume.	Forcing payroll to rise smoothly with every new sale.
System Components Bulk Purchase	Variable	Apply 8.0% of revenue in the first year, declining to 7.0% by the fifth year.	Using a flat dollar amount instead of tying components to revenue.
Sales & Marketing Ad Spend	Variable	Apply 5.0% of revenue in the first year, declining to 4.0% by the fifth year.	Locking ad spend as fixed when it is modeled as sales-linked.
Installation Consumables & Fuel	Variable	Apply 2.0% of revenue in the first year, declining to 1.6% by the fifth year.	Bundling fuel and supplies into fixed fleet overhead.
Smart Hardware & Software Licensing	Variable	Apply 2.0% of revenue in the first year, declining to 1.6% by the fifth year.	Expensing upfront app development inside monthly break-even.

How does break-even change from a lean first-crew launch to a full territory build?

Scenario table

Lean is the tightest case because fixed payroll and overhead hit before volume fully builds. Base and full cases add revenue faster than fixed costs, so the cushion widens.

Planning cases only; actual break-even will shift with job mix, timing, and hiring pace.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$49.4k	$8.4k	$35.9k	83.0%	$5.1k	Tight cushion; this is the closest to break-even.
Base steady-flow case	$101.4k	$16.6k	$39.0k	83.6%	$45.8k	Break-even is cleared; this is the steadier operating case.
Full territory case	$452.4k	$64.4k	$63.8k	85.8%	$324.2k	Wide cushion; this fits expanded territory and crew depth.

What breaks this rainwater harvesting plan’s break-even point?

Stress test

The base case clears break-even, but the cushion is not huge. A 15% revenue drop, a 10% rise in fixed costs, or a margin slip to 78% can quickly shrink profit, and the combined hit creates a large monthly loss.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	Base case uses $494k monthly revenue, $359k fixed costs, and 83% contribution margin.	$433k	$61k cushion	Base case clears break-even, but the cushion is modest.
Revenue shortfall	Monthly revenue falls 15% from the base case.	$433k	$13k gap	A 15% demand drop pushes the month to about a $10k loss.
Fixed-cost pressure	Fixed costs rise 10% to about $395k per month.	$476k	$18k cushion	Higher overhead leaves only about $15k of monthly profit.
Margin pressure	Contribution margin falls from 83% to 78%.	$460k	$34k cushion	Component or subcontract pressure cuts monthly profit to about $27k.
Combined pressure	Revenue falls 15%, fixed costs rise 10%, and margin slips to 78%.	$506k	$86k gap	That mix creates about a $67k monthly loss.

Before you sign the warehouse lease and hire the crew, what should you verify first?

Founder checklist

Do not lock in fixed costs until homeowner pricing, supplier quotes, and lead flow all support the model. With year 1 fixed load at about $35.9K a month and a $779K cash floor in Month 12, break-even is a cash test, not a sales wish.

1Price proof$4.5K/$9K/$18K

Verify signed supplier quotes and real homeowner quotes for the Garden, Household, and Smart tiers before you treat those prices as sellable; that keeps the 83% year 1 contribution margin believable.

2Lead flow5.0% ads

Verify steady homeowner inquiries before you carry 5.0% ad spend, because break-even depends on repeatable lead flow, not a one-time launch spike.

3Lease load$35.9K/mo

Verify install backlog can cover the full year 1 fixed load of about $35.9K a month before you sign the $4,000 warehouse lease.

4Crew rampMonth 13

Verify the core install process works before the Month 13 hiring wave for the junior installer and software developer, or payroll will outrun output.

5Cash runway$779K

Verify cash stays above the $779K Month 12 floor after the $145K build-out, fleet, tools, and IT capex, and keep the $40K app MVP until core installs work.

6Service terms$250/mo

Verify warranty, insurance, permitting, and maintenance plan terms before launch so the $250 recurring plan adds profit, not surprise service cost.