Basement Conversion Break-Even Analysis: $68K Monthly Revenue

Fixed costs $53.9K/mo Overhead base

Contribution margin 71% After variable costs

Break-even revenue $75.9K/mo Monthly target

Break-even timing Month 5 Launch ramp

Break-even calculator

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

Lean Base Full

Monthly revenue Higher revenue gives you more room above project costs. $ Lower sales Higher sales Variable expenses These are direct costs that rise with each basement project. $ Lower direct costs Higher direct costs

Money available to cover fixed costs $227,669 $309,333 revenue - $81,664 variable expenses

Margin ratio

74%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead your margin must cover. $ Lower overhead Higher overhead

Break-even chart Revenue Total costs

Which basement conversion expenses are fixed, and which move with signed jobs?

Cost classification

Break-even gets shaky when job-linked costs are treated like overhead. Keep fixed monthly costs separate from revenue-based costs so the Month 5 break-even target reflects real job economics.

Expense	Cost	Break-Even Treatment	Common Mistake
Office and showroom rent, $4,500/month	Fixed	Include in monthly overhead before calculating required gross profit.	Spreading rent across jobs and hiding the true monthly nut.
General liability insurance, $1,200/month	Fixed	Treat as recurring overhead for the full planning period.	Dropping it from break-even because it is not tied to one project.
Project management software, $350/month	Fixed	Include as a stable operating expense in the fixed base.	Calling small software spend immaterial and missing overhead creep.
Direct project materials, 14% of first-year revenue	Variable	Deduct from revenue before contribution margin, since it rises with booked work.	Treating materials as overhead and overstating margin per job.
Subcontractor labor fees, 10% of first-year revenue	Variable	Model as a job-linked expense that moves with signed projects.	Parking subcontracted trades in fixed overhead when volume drives the spend.
Permitting and municipal fees, 3% of first-year revenue	Variable	Apply as a revenue-linked project cost in contribution margin.	Forgetting permits rise with jobs, not with time.
Waste disposal and hauling, 2% of first-year revenue	Variable	Include with direct job costs because demolition and closeout create the load.	Treating hauling as a flat overhead line.
Vehicle maintenance and fuel, $1,800/month	Semi-fixed	Use the monthly base, then step it up when crews and routes expand.	Assuming one truck budget can support every added project manager and carpenter.

How does break-even change as a basement conversion business moves from lean bookings to a fuller schedule?

Scenario table

More booked work spreads rent, software, insurance, and admin payroll across more revenue, so break-even gets easier. Lean stays near the line, base builds a small cushion, and full booking creates a much stronger profit buffer.

These are model-based planning assumptions, not a guarantee of demand, pricing, or profit.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean booking mix	$69,000	$20,000	$48,375	71%	$625	Near break-even; one slow month would slip red.
Base Year 1 mix	$124,333	$36,000	$53,900	71%	$34,400	Healthy cushion; overhead starts to absorb well.
Full Year 2 mix	$233,417	$64,700	$59,100	72%	$109,600	Strong cushion; fixed costs are well covered.

What breaks the break-even plan for a basement conversion service?

Stress test

The plan breaks first if signed work slips or subcontractor rates rise. With a $68,134 break-even point and a Year 1 monthly revenue run rate of about $124,333, the cushion is real, but change-order leakage, permit delays, and late closeouts can eat it fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$68,134	$56,199 cushion	Year 1 revenue sits above break-even, so the base plan has room.
Revenue shortfall	Year 1 monthly revenue falls 10%.	$68,134	$43,766 cushion	A 10% booking miss removes about $12,433 of monthly sales.
Fixed-cost pressure	Monthly overhead rises by $1,000.	$69,542	$54,791 cushion	Each extra $1,000 of overhead lifts the break-even floor fast.
Margin pressure	Variable expenses rise by 1 percentage point.	$69,109	$55,225 cushion	One point more in materials or labor cuts monthly contribution by about $1,243.
Combined pressure	Year 1 monthly revenue falls 10%, variable expenses rise 1 point, and overhead rises $1,000.	$70,537	$41,363 cushion	Late closeouts and higher subcontractor rates can burn through the safety band.

Can you prove the basement conversion business breaks even before you commit to the lease, crew, and vans?

Founder checklist

Only sign the lease and hire the crew if the pipeline, margin, and cash math already work. This model needs at least 5 weighted jobs a month, about $44.6K of monthly fixed load, and $751K cash by Month 2 to make break-even believable.

1Pipeline5 jobs/mo

Verify you can hold at least 5 weighted jobs a month before you lock the lease, because that is the demand floor the model uses to reach break-even.

2Fixed Load$44.6K/mo

Check that payroll and overhead really land near this number, because rent, insurance, software, vehicles, accounting, utilities, and Year 1 labor must all be covered.

3Margin71% CM

Keep contribution margin, or revenue left after variable costs, near 71% in Year 1 by including 14% materials, 10% subcontractors, 3% permitting, and 2% hauling in every estimate.

4Crew Ramp5.5 FTE

Confirm you can staff 1 general manager, 1 project manager, 2 lead carpenters, 0.5 designer, and 1 admin, because gaps here slow jobs and push break-even out.

5Cash Buffer$751K

Hold this cash before ramp-up, since the model’s minimum cash lands in Month 2 and a thin reserve leaves no room for slow starts or rework.

6Launch Spend$45K / $2.5K CAC

Do not buy vans, tools, or showroom samples until booked work supports capacity and marketing is producing leads at the Year 1 budget of $45,000 with CAC near $2,500.