Geodesic Dome Construction Break-Even: About $75K Per Month

Fixed costs $53.5K/mo Payroll and overhead

Contribution margin 74.5% After variable spend

Break-even revenue $71.8K/mo Monthly revenue floor

Break-even timing Month 1 Launch month

Break-even calculator

Test whether monthly dome sales cover direct costs and the fixed cost base.

Lean Base Full

Monthly revenue Use this as the top-line monthly sales that funds the rest of the model. $ Low sales High sales Variable expenses Enter direct costs that move with each dome sale, like materials, labor, and selling spend. $ Low costs High costs

Money available to cover fixed costs $1,774,541 $1,966,250 revenue - $191,709 variable expenses

Margin ratio

90%

Covers fixed costs

Yes

Fixed monthly costs Enter the monthly cost base that stays on even when sales dip. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which geodesic dome construction expenses are fixed, variable, semi-variable, or semi-fixed?

Cost classification

Break-even gets shaky when shop lease, payroll, materials, freight, and field labor are blended into one overhead bucket. Sort each expense by how it behaves before using first-year revenue of $5.715 million as the target line.

Expense	Cost	Break-Even Treatment	Common Mistake
Manufacturing Facility Lease ($12,000/month)	Fixed	Carry as $12,000 per month across the relevant planning range.	Spreading rent across units, then understating break-even when volume drops.
R and D Software Licenses ($1,500/month)	Fixed	Include as a monthly operating load from Month 1 through Month 60.	Treating software like project labor instead of recurring overhead.
Recycled Steel Struts ($15,000 per residential dome)	Variable	Apply per Eco Residential Dome produced and sold.	Blending steel into factory overhead and hiding unit margin pressure.
Direct Construction Labor ($5,000 per residential dome)	Variable	Assign directly to each Eco Residential Dome job.	Pooling field labor with salaried payroll and overstating contribution margin.
Sales Commissions (3% of revenue)	Variable	Calculate as 3% of revenue in each break-even period.	Forgetting commissions when large residential or commercial jobs close.
Digital Marketing Ad Spend (5% of first-year revenue)	Variable	Use 5% of revenue in the first year, then update to the modeled rate by period.	Freezing ad spend as a flat budget while sales volume scales.
Factory Utilities (0.5% of revenue)	Semi-variable	Model as production-linked shop overhead at 0.5% of revenue.	Putting all utilities in fixed overhead and missing usage swings.
Production Manager ($85,000 salary; 1.0 to 2.0 FTE)	Semi-fixed	Hold at planned staffing until volume and scheduling load require the next FTE step.	Scaling management payroll smoothly with revenue instead of in hiring steps.

How does break-even change across a lean greenhouse mix, the base portfolio, and a full residential build?

Scenario table

Project mix changes the break-even line because greenhouse domes use smaller tickets and lower direct cost, while residential domes carry more revenue per job. The portfolio stays above break-even in all three cases, but the lean case has the tightest cushion.

Planning cases only; actual mix, pricing, and timing can move the result.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean greenhouse start	$90k	$26.7k	$53.5k	70.3%	$9.8k	Above break-even, but the cushion is thin.
Year 1 portfolio mix	$476.3k	$135.6k	$53.5k	71.5%	$287.1k	Comfortable pass; the mix spreads fixed cost well.
Eco residential case	$250k	$69.5k	$53.5k	72.2%	$127k	Strong pass, but backlog timing matters more.

What pushes geodesic dome construction past break-even?

Stress test

Current break-even lands at about $748,000 a month. The main risks are a delayed $250,000 residential dome, weaker greenhouse sales, or higher materials and labor costs, because each one widens the gap fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change from the base case.	$748,000	$272,000 gap	The base plan has little room for a slow start.
Revenue shortfall	Monthly revenue falls 20% from the Year 1 average.	$748,000	$367,000 gap	One delayed residential dome can push the month under water.
Fixed-cost pressure	Monthly fixed costs rise 10% from $535,000 to $588,500.	$823,000	$347,000 gap	Lease, insurance, and showroom costs can outrun sales.
Margin pressure	Variable expenses rise 5 points, so contribution margin falls to 66.5%.	$805,000	$328,000 gap	Material, freight, and rework costs eat the spread fast.
Combined pressure	Revenue falls 20%, fixed costs rise 10%, and margin falls to 66.5%.	$886,000	$505,000 gap	A weak sales month plus overruns would widen the hole quickly.

What should a geodesic dome founder verify before signing the lease and funding the buildout?

Founder checklist

Proceed only if booked work, supplier timing, and cash all pass the opening-month test. The model shows break-even in Month 1, but it still needs $1.125M minimum cash and real demand before the lease and equipment buys start.

1Booked work$5.7M Y1

Verify deposits and signed orders cover the first-year build plan before you take the $12K lease, because Year 1 revenue is $5.715M across 81 units.

2BOM check59% EBITDA

Check the bill of materials for all five dome types and keep engineering, CAD, and fabrication aligned, because Year 1 EBITDA is $3.383M on $5.715M of revenue and bad inputs hit margin fast.

3Supply timing8 inputs

Confirm lead times and freight for steel, glazing, panels, insulation, hubs, lumber, windows, and sealants, plus site delivery, before you quote install dates, or one late part will stall the whole job.

4Crew ramp15 FTE

Prove the field install team can handle the forecast staffing ramp and map permit and inspection steps before promised dates, because sold work only counts if crews can finish it on time.

5Cash cushion$1.125M

Keep the opening cash reserve above the Month 1 minimum cash need and cover the about $53.5K monthly fixed load, or normal timing gaps will turn into a funding problem.

6Launch spend$510K

Phase the $510K buildout across CNC, hoists, showroom, welding, truck, ERP, and tooling, and hold early digital marketing near the 5.0% starting point until bookings prove the funnel.