Straw Bale Home Construction Break-Even: $80K Monthly Revenue

Fixed costs $59.6K/mo Payroll and overhead

Contribution margin 54% After variable costs

Break-even revenue $109.5K/mo Monthly revenue target

Break-even timing Month 18 Model break-even point

Break-even calculator

Test whether monthly project revenue covers direct job costs and fixed overhead for a straw bale home builder.

Lean Base Full

Monthly revenue Revenue is the pool that covers direct costs and fixed overhead. $ Low volume High volume Variable expenses These rise with each project, like subcontracting, permits, commissions, and project fees. $ Tight costs Higher costs

Money available to cover fixed costs $126,720 $149,083 revenue - $22,363 variable expenses

Margin ratio

85%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead base that contribution margin must cover. $ Lean overhead Heavier overhead

Break-even chart Revenue Total costs

Which straw bale construction expenses are fixed, and which move with sales?

Cost classification

Break-even only works if fixed overhead stays fixed and job-linked charges move with revenue. For this model, Month 18 break-even depends on separating $18,300/month baseline overhead from project percentages and capacity hires.

Expense	Cost	Break-Even Treatment	Common Mistake
Workshop & Office Rent	Fixed	Include $7,500/month in overhead before calculating required project revenue.	Assigning rent only to active jobs and understating slow-month burn.
General Liability & Builders Risk Insurance	Fixed	Include $5,000/month before revenue because coverage runs from Month 1.	Waiting to add insurance until the first build starts.
Subcontracted Engineering & Surveying	Variable	Apply the Year 1 rate of 5.0% of revenue, then update by year.	Treating recurring project engineering as a one-time setup item.
Project-Specific Permitting & Legal Fees	Variable	Apply the Year 1 rate of 4.0% of revenue and time it to signed projects.	Averaging fees evenly across months without project timing.
Sales Commissions & Referral Fees	Variable	Apply 7.0% of Year 1 revenue, falling to 5.0% by Year 5.	Putting commissions in overhead instead of tying them to won work.
Vehicle Leases & Maintenance	Semi-variable	Carry the $2,000/month base and track added job-site mileage risk separately.	Ignoring site travel when more builds run at once.
Project Manager Payroll	Semi-fixed	Model salary capacity in steps as headcount rises from 1.0 FTE to 3.0 FTE.	Hiring ahead of signed work and lifting break-even too early.

How does break-even shift from a lean launch month to a full pipeline month?

Scenario table

The base case lands near Month 18 because the mix and margin are just enough to cover about $59.6k of monthly fixed cost. Lean stays short, while a full pipeline month creates cushion.

Planning numbers only: these are assumptions-based scenarios, not a promise of actual demand or margin.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch month	$42.8k	$8.1k	$59.6k	81%	-$24.8k	Still below break-even; fixed labor and overhead outrun contribution.
Break-even base case	$71.7k	$12.2k	$59.6k	83%	$0k	Covers fixed load with little cushion; small slippage turns it negative.
Full pipeline month	$94.6k	$16.1k	$59.6k	83%	$18.9k	Above break-even, so the main constraint shifts to crew capacity.

What pushes this straw bale builder below break-even?

Stress test

Base break-even is solid, but it’s sensitive to demand, overhead, and margin. A 15% revenue dip, a 10% rise in overhead, or variable costs moving from 19% to 24% can push monthly break-even out of reach.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$797,000	$0 gap	At this level, monthly break-even is met.
Revenue shortfall	Monthly revenue falls 15%.	$797,000	$98,000 gap	Slower starts and weaker deposits leave fixed costs uncovered.
Fixed-cost pressure	Overhead rises 10% to about $710,000 monthly.	$877,000	$80,000 gap	Rent, insurance, or staffing creep adds a new monthly hurdle.
Margin pressure	Variable expenses rise from 19% to 24%.	$849,000	$52,000 gap	Higher subcontractor, permit, or referral costs squeeze contribution.
Combined pressure	Revenue falls 15%, variable expenses rise to 24%, and overhead rises 10%.	$934,000	$257,000 gap	This is the worst runway case and needs tighter deposits and cost control.

Can you cover the fixed burn before you lock the workshop, trucks, and crew?

Founder checklist

Don’t lock in the yard, trucks, or full crew until the pipeline can carry about $59.6K of fixed burn a month. The model only gets to break-even by Month 18, with a $71K cash low point, so pricing and backlog have to show up early.

1Demand ProofYear 1 $514K

Confirm the code path and first deals before you take deposits, because the model needs Year 1 revenue to reach $514K.

2Fixed Burn$59.6K/mo

Get straw supplier quotes and storage counts before you sign the $7.5K monthly workshop lease, because the full fixed load is about $59.6K a month before project work starts.

3Insurance Bind$5.0K/mo

Bind general liability and builders risk before site work, since the model already sets aside $5.0K a month for insurance and the first build cannot wait for coverage.

4Margin Check81% CM

Test $175, $200, and $250 hourly pricing against Year 1 costs; after 5% engineering and surveying, 3% software, 7% sales and referral, and 4% permitting and legal, contribution is about 81% before fixed costs.

5Staffing Ramp$495K/yr

Keep hiring tied to signed backlog, since Year 1 wages total $495K across five full-time roles and the model cannot carry that load without booked work.

6Cash Floor$71K

Keep at least the $71K minimum cash cushion and delay the $245K truck, skid steer, and compressor wave until backlog is signed, because the full launch capex is $395K and it lands before the business is stable.