Smart Building Integration Break-Even: About $171K Per Month

Fixed costs $105.0K/mo Monthly fixed base

Contribution margin 70.2% After variable costs

Break-even revenue $149.6K/mo Needed per month

Break-even timing Month 18 Forecast crossover

Break-even calculator

Test monthly revenue, variable expenses, and fixed costs against break-even for a smart building integration firm.

Lean Base Full

Monthly revenue Use monthly sales or project billings; it sets the margin left for fixed costs. $ Lower sales Higher sales Variable expenses These rise with each job, like hardware, cloud fees, commissions, and subcontractors. $ Lower direct Higher direct

Money available to cover fixed costs $193,876 $265,583 revenue - $71,707 variable expenses

Margin ratio

73%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead base, including payroll, rent, insurance, and admin. $ Lower overhead Higher overhead

Break-even chart Revenue Total costs

Which expenses are fixed and which move with sales in a smart building integration company?

Cost classification

Break-even is only reliable if each expense follows the right behavior. Treat fixed salaries or rent like job-level spend, and Month 18 break-even can look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Office Rent & Utilities	Fixed	Carry $15,000 per month in overhead from Month 1 through Month 60, regardless of project count.	Spreading rent across each installation and lowering it when sales slow.
Insurance & Legal	Fixed	Include $4,500 per month in fixed overhead for the relevant planning range.	Removing it from break-even because it does not attach to one customer job.
Hardware & Equipment Costs	Variable	Model as revenue-linked COGS: 18.0% of first-year revenue, declining to 13.0% by the fifth year.	Entering hardware as a flat monthly spend instead of tying it to project revenue.
Cloud Infrastructure & Software Licensing	Variable	Apply as revenue-linked COGS: 5.5% in the first year, declining to 4.2% by the fifth year.	Treating all software spend as fixed when the model links it to revenue volume.
Sales Commissions & Marketing	Variable	Use the variable rate against revenue: 4.8% in the first year, improving to 3.2% by the fifth year.	Double counting it with the separate annual marketing budget.
Third-Party Installation Subcontractors	Variable	Apply subcontractor spend as a direct percentage of revenue, from 1.5% in the first year to 0.8% by the fifth year.	Leaving subcontractors in fixed overhead even though use rises with field work.
Salaried Engineering and Technician Payroll	Semi-fixed	Model payroll in hiring steps as full-time equivalent headcount grows with capacity, not one hour at a time.	Treating technician payroll as fully variable when salaries remain due during slow project months.
Vehicle Fleet & Equipment Maintenance	Semi-fixed	Carry the $3,200 monthly base, then step it up only when fleet capacity expands.	Reducing the full fleet expense in line with every missed installation.

How does break-even change from a lean Year 1 mix to the base Year 2 case and the full Year 5 buildout?

Scenario table

Recurring monitoring rises from 45% in Year 1 to 95% in Year 5, so revenue gets steadier and spreads fixed overhead better. The lean case stays cash-tight, the base case is close, and the full case has a clear cushion.

Planning assumptions only; actual margins, staffing, and collections can move the break-even point.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean Year 1 installer mix	$114k	$34k	$120k	70.2%	-$40k	Still below break-even; fixed costs outrun contribution.
Base Year 2 balanced mix	$266k	$72k	$162k	72.9%	$32k	Near break-even with only a small monthly cushion.
Full Year 5 recurring mix	$1.29M	$274k	$311k	78.8%	$705k	Strong cushion; recurring work helps absorb install swings.

What breaks the break-even plan for a smart building integration business?

Stress test

The base plan needs about $171,000 a month to break even, but Year 1 revenue runs closer to $114,000 a month, so the gap is about $57,000. The main risks are slow signed projects, labor overruns, weaker hardware margin, and hiring before backlog.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change to the base case.	$171,000/month	$0 gap	Base case only works at the target run rate.
Revenue shortfall	Year 1 revenue holds at $114,000/month.	$171,000/month	$57,000 gap	Slow signed projects leave cash tight.
Fixed-cost increase	Fixed load rises to about $162,000/month in Year 2.	$222,000/month	$108,000 gap	Overhead and hiring lift the bar fast.
Margin pressure	Use Year 1 variable expenses of 29.8% instead of 27.0%.	$231,000/month	$117,000 gap	Weak hardware or labor margin pushes break-even higher.
Combined pressure	Year 2 fixed load and Year 1 margin both hit the plan.	$231,000/month	$82,000 gap	Backlog must come before headcount.

Can this integration business prove enough signed work before it commits to a lease and fleet?

Founder checklist

Before you sign a lease or expand the fleet, test the model against real signed work, not a hope. Year 1 CAC (customer acquisition cost) is $12K, annual marketing spend is $180K, and minimum cash lands at -$429K in Month 18.

1Lease Pipeline$171K/mo

Verify signed work can reach about $171K a month before locking a lease, because that is the revenue level the model needs to make the fixed load believable.

2Fixed Load$29.2K/mo

Check that rent, insurance, fleet, accounting, supplies, and training total $29.2K a month, because that floor gets paid even when projects slip.

3Stack Cost5.5%

Keep cloud and software licensing near 5.5% of revenue in Year 1, or the control stack will chip away at margin before scale shows up.

4Core Team8.0 FTE

Have the CEO, 2 senior systems engineers, 3 installation technicians, 1 data analytics role, and sales coverage in place before adding more payroll, because 8.0 FTE of core capacity has to turn signed jobs into billable hours.

5Capex Backlog$260K

Stage the $65K tools, $75K diagnostic gear, and $120K fleet spend against signed work, and keep the $110K parts stock off the books until the installation backlog is real.

6Cash Cushion-$429K

Model enough cash to absorb the -$429K trough in Month 18, or the business could run out of room before payback at Month 40.