Intercom Installation Break-Even Analysis: $73K Monthly Revenue

Fixed costs $11.4K/mo Base overhead

Contribution margin 70% After variable costs

Break-even revenue $86.8K/mo Zero-EBITDA run rate

Break-even timing Month 10 Model crossover

Break-even calculator

Use this calculator to test how monthly revenue covers variable expenses and fixed monthly costs for an intercom installation service.

Lean Base Full

Monthly revenue Revenue is the pool that covers direct costs and overhead. $ Lower sales Higher sales Variable expenses These are direct costs that rise with each new install or service visit. $ Tighter costs Higher costs

Money available to cover fixed costs $70,000 $100,000 revenue - $30,000 variable expenses

Margin ratio

70%

Covers fixed costs

Yes

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

Break-even chart Revenue Total costs

Which expenses are fixed and which move with sales for an intercom installation contractor?

Cost classification

Break-even gets reliable when rent, payroll, materials, and sales costs sit in the right buckets. Misclassify a 18% hardware load or a $130k technician base, and Month 10 break-even can look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse and Office Rent	Fixed	Include the $6,500 monthly rent in the $11.4k monthly nonpayroll overhead base.	Don’t tie rent to job count.
General Liability and Workers Comp Insurance	Fixed	Include the $1,800 monthly premium in base overhead before calculating break-even jobs.	Don’t bury insurance inside project margin.
Hardware and Equipment Costs	Variable	Model as 18% of first-year revenue, falling to 15% by the mature year.	Don’t price bids without a material load.
Subcontracted Low Voltage Labor	Variable	Model as 5% of first-year revenue, then reduce to 3% as internal capacity grows.	Don’t ignore overflow labor.
Sales Commissions	Variable	Deduct 4% of revenue before reading contribution margin, which is sales left after variable expense.	Don’t count gross revenue as keepable cash.
Fuel and Vehicle Maintenance	Semi-variable	Use 3% of first-year revenue for usage, then taper to 2% as routing improves.	Don’t assume route time is free.
Installation Technician payroll	Semi-fixed	Start with the $130k annual first-year technician salary base and add headcount in steps.	Don’t add hires before utilization supports them.
Marketing budget	Semi-fixed	Treat the $45k first-year budget as a planned capacity spend tied to lead flow.	Don’t spend before the bid pipeline is measurable.

How does break-even change from a lean launch to a full build-out for an intercom installation service?

Scenario table

Break-even shifts as mix and staffing change. The lean launch is near the line, the base case clears it, and the full setup has the best cushion if signed projects and maintenance subscriptions keep building.

These are planning assumptions, not guarantees; actual break-even will move with project timing, pricing, and staffing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$60.4k	$18.1k	$56.8k	70.0%	-$14.5k	Close to break-even; one slow month matters.
Base case	$121.3k	$34.3k	$68.0k	71.7%	$19.0k	Above break-even; keep enough signed work to hold the cushion.
Full build-out	$267.4k	$64.2k	$116.7k	76.0%	$86.5k	Strong cushion if technician hours and maintenance sales keep up.

What breaks the break-even plan for this intercom installation business?

Stress test

The plan breaks fast if installs slow down, overhead creeps up, or job margin gets squeezed by hardware, subcontractors, and fuel. A 10% revenue miss or a 10% cost bump can turn break-even into a monthly loss; combine both and the gap jumps hard.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$731k	$0 cushion	No cushion; even a small miss matters.
Revenue shortfall	Revenue runs 10% below the break-even run rate.	$731k	$51k gap	A 10% revenue dip creates a roughly $51k monthly loss.
Fixed-cost increase	Fixed overhead rises 10% to about $563k.	$804k	$51k gap	A 10% overhead bump adds about $51k of pressure.
Margin pressure	Contribution margin falls 5 points to 65%.	$788k	$37k gap	A 5-point margin drop still creates a real monthly gap.
Combined pressure	Revenue falls 10%, margin drops to 65%, and fixed overhead rises 10%.	$866k	$135k gap	Stacked pressure pushes the monthly gap to about $135k.

What should the founder verify before locking in vans, hiring, and inventory for this intercom installation business?

Founder checklist

Before you buy vans and add payroll, make sure signed work, cash, and staffing line up with the model. Break-even lands in Month 10, and the plan needs $604K of minimum cash by Month 9, so the launch has to carry a real runway.

1Demand proof$725K Y1

Verify signed bids and pipeline can support $725K in first-year revenue, and keep customer acquisition cost (CAC) near $1.5K so the $45K Year 1 marketing budget keeps filling the schedule.

2Fixed load$11.4K/mo

Check the monthly fixed overhead before wages stays at $11.4K, because rent, insurance, software, utilities, accounting, and showroom costs lock in fast.

3Margin mix70% CM

Check contribution margin, the cash left after variable costs, stays near 70% after hardware at 18% of revenue, subcontract labor at 5%, commissions at 4%, and fuel at 3%.

4Capacity ramp40h + 15h

Map each active customer to 40 installation hours and 15 smart-lock hours, and do not add payroll beyond two installation techs until that load is real.

5Cash cushion$604K / Month 9

Hold cash through the Month 9 low point and confirm the business can absorb the model's $604K minimum cash need before break-even arrives.

6Launch setup2 vans

Secure vendor accounts, warranty response, and maintenance handoff before stocking hardware, then commit to the two $45K vans only if the launch workflow is ready.