Sustainable Construction Break-Even Analysis: $92K Monthly Revenue

Fixed costs $69.2K/mo Staff and overhead

Contribution margin 80.5% After variable costs

Break-even revenue $86.0K/mo Monthly revenue needed

Break-even timing Month 1 First profitable month

Break-even calculator

Use this calculator to test whether monthly revenue covers variable expenses and fixed monthly costs.

Lean Base Full

Monthly revenue Revenue sets the monthly pool that can cover direct costs and overhead. $ Lower sales Higher sales Variable expenses These are direct costs that rise with project volume and contract value. $ Lower costs Higher costs

Money available to cover fixed costs $670,833 $833,333 revenue - $162,500 variable expenses

Margin ratio

80%

Covers fixed costs

Yes

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

Break-even chart Revenue Total costs

Which expenses are fixed, and which move with sales for an energy-efficient builder?

Cost classification

Break-even is reliable only when job-level spending is kept out of overhead. Here’s the quick math: fixed overhead sets the monthly hurdle, while variable percentages reduce contribution margin on each project dollar.

Expense	Cost	Break-Even Treatment	Common Mistake
Office Rent, $8,000/month	Fixed	Include in monthly overhead for the full planning range from Month 1 to Month 60.	Spreading rent across projects and hiding the true base revenue hurdle.
General Business Insurance, $1,500/month	Fixed	Include as recurring overhead unless coverage changes with scale.	Treating policy premiums like job insurance and pushing them into project margin.
Sustainable Materials Procurement, 8.0% of revenue	Variable	Deduct from each revenue dollar before calculating contribution margin.	Putting materials in overhead, which makes break-even look too low.
Specialized Subcontractor Fees, 7.0% of revenue	Variable	Model as job-level spending that rises with signed work.	Assuming subcontractors are fixed capacity when the model prices them as a sales percentage.
Green Building Certification Fees, 2.0% of revenue	Variable	Apply against project revenue because the fee load moves with work volume.	Leaving certification out of contribution margin and overstating project profit.
Project-Specific Marketing & Bidding, 2.5% of revenue	Variable	Deduct as sales-linked acquisition and bid spending.	Mixing it with general marketing and losing sight of bid efficiency.
Utilities & Internet, $1,200/month	Semi-variable	Use the base monthly charge in overhead, then review usage increases as activity grows.	Locking it as fully fixed when field and office usage can rise with workload.
Skilled Construction Crew Lead Capacity	Semi-fixed	Treat new crew capacity as a step up in overhead when hiring happens before signed work.	Modeling crew labor as perfectly variable even when payroll starts before projects are billed.

How does break-even shift from a lean pipeline to a full project mix?

Scenario table

Break-even stays below modeled revenue in all three cases, but the cushion gets much wider as revenue scales faster than fixed payroll. The margin stays the same because the cost mix is held steady across commercial, institutional, residential, retrofit, and consulting work.

These are planning assumptions based on the model inputs, not a guarantee of future results.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean commercial-heavy pipeline	$2,167K	$423K	$742K	80.5%	$1,002K	Break-even is covered, but the cushion is still the thinnest here.
Base balanced project mix	$4,917K	$959K	$1,000K	80.5%	$2,958K	This is the cleanest mid-case: revenue runs far above break-even.
Full pipeline scaled mix	$8,333K	$1,625K	$1,267K	80.5%	$5,441K	Break-even risk is low unless project timing slips hard.

What breaks the break-even plan for this sustainable construction business?

Stress test

The first-year plan has a wide cushion, but it is sensitive to lower revenue, higher fixed overhead, and margin pressure from materials, subcontractors, fuel, and insurance. Cash is the real warning sign: minimum cash falls to $702K in Month 5.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$921K	$1.245M cushion	Break-even is covered, but cash dips to $702K in Month 5.
Revenue shortfall	Monthly revenue falls to $921K.	$921K	$0 gap	Any more downside pushes the model below break-even.
Fixed-cost increase	Fixed monthly costs rise from $742K to $1.744M.	$1.744M	$1.002M cushion	Overhead can more than double before break-even fails.
Margin pressure	Variable expenses rise from 195% to 658% of revenue.	$2.167M	$0 gap	Bid slippage, rework, fuel, insurance, or materials can wipe out margin.
Combined pressure	Revenue slips, fixed costs rise, and margin weakens together.	$921K	$0 gap	This is the fragile case, and Month 5 cash still needs $702K.

Can this sustainable construction firm carry the lease, crew, and equipment before signed work is in hand?

Founder checklist

The model reaches break-even in Month 1, but the real test is whether signed work can cover the $20K monthly fixed load, the $54.2K monthly Year 1 payroll, and the $702K cash dip in Month 5.

1Signed backlog$2.6M Y1

Do not sign the lease or add crews until committed bids and signed backlog can support the $2.6M first-year revenue plan, because break-even only holds if jobs convert to billings on time.

2Fixed load$20.0K/mo

Only take office space if the business can carry the $20K monthly fixed load from rent, insurance, software, vehicle, and admin costs even before the pipeline matures.

3Margin stack80.5%

Verify materials stay near 8%, subcontractors near 7%, and project fees near 4.5% so each dollar of revenue still leaves 80.5 cents before payroll and rent.

4Core payroll$54.2K/mo

Hire the CEO, project manager, designer, crew lead, and admin team only when signed backlog or committed bids can cover about $54.2K a month in payroll.

5Cash reserve$702K

Hold at least $702K through Month 5, because the model's cash trough arrives before the early build-out and staffing ramp are fully settled.

6Launch setup$620K

Fund the full $620K early capex package and lock material and subcontractor capacity at 8% and 7% before launch, or the job mix will outrun your cash and margin.