Dimmer Switch Installation Break Even: About $24k Monthly Revenue

Fixed costs $5.1K/mo Core overhead base

Contribution margin 69% After variable costs

Break-even revenue $7.4K/mo Monthly target

Break-even timing Month 6 Model break point

Break-even calculator

Use this calculator to test monthly revenue, variable expenses, and fixed costs against break-even for a dimmer switch installation service.

Lean Base Full

Monthly revenue Revenue drives the margin left after direct costs. $ Lower revenue Higher revenue Variable expenses Direct costs like hardware, vehicle use, commissions, and card fees rise with sales. $ Lower costs Higher costs

Money available to cover fixed costs $19,150 $27,750 revenue - $8,600 variable expenses

Margin ratio

69%

Covers fixed costs

Yes

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

Break-even chart Revenue Total costs

Which dimmer switch installation expenses are fixed, and which move with sales?

Cost classification

Break-even is only useful if fixed overhead stays above the line and job-level drag sits below revenue. Misclassifying materials, card fees, or referrals can make Month 6 break-even look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Office and Workshop Rent	Fixed	Put $2,400 per month above the line as recurring overhead.	Spreading rent across jobs and assuming it falls when sales dip.
Business Insurance	Fixed	Put $800 per month above the line; it does not move with installs.	Treating required coverage like a per-job charge.
Software Subscriptions	Fixed	Put $450 per month above the line for scheduling, billing, and admin tools.	Ignoring small monthly tools that still raise the break-even floor.
Electrical Components and Hardware	Variable	Deduct 18.0% of first-year revenue below the line before contribution margin.	Treating materials as overhead instead of job-level drag.
Payment Processing Fees	Variable	Deduct 1.5% of revenue below the line for card and digital payments.	Leaving processing out because each charge feels small.
Sales Commissions and Referral Fees	Variable	Deduct 3.5% of first-year revenue below the line when jobs are sourced through referrals.	Classifying referral fees as marketing overhead instead of sales-linked drag.
Vehicle and Equipment Costs	Semi-variable	Model the 8.0% first-year charge below the line because usage rises with job count.	Burying travel, wear, and equipment use inside fixed overhead.
Licensed Electrician Payroll	Semi-fixed	Add payroll in capacity steps, from 0.5 FTE in the first year to 1.0 FTE in the second year.	Assuming labor rises smoothly with each job instead of jumping when hiring happens.

How does break-even shift from a lean start to a full route in dimmer switch installation?

Scenario table

Break-even changes with route density and job mix. Lean keeps launch risk high, base lands near break-even, and full volume gives a clear cushion once fixed costs are covered.

Planning assumptions only; actual results will move with close rates, job mix, and overhead.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch validation	$167k	$52k	$164k	69%	($49k)	Still below break-even, so watch cash closely.
Base survival route	$239k	$74k	$164k	69%	$1k	Near break-even, so pricing and close rate matter most.
Full route density	$333k	$103k	$164k	69%	$66k	Clear cushion, with room for bundled upgrades.

What breaks the break-even plan for dimmer switch installation?

Stress test

The base plan clears break-even with a decent cushion, but it gets tight fast if bookings slip, fixed overhead climbs, or margins fall. A 15% revenue drop nearly erases profit, and combined pressure can flip the month to a loss.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$238k	$40k cushion	Healthy cushion if bookings stay on pace.
Revenue shortfall	Monthly revenue falls 15% to about $236k.	$238k	$2k gap	Slow bookings nearly wipe out profit.
Fixed-cost pressure	Fixed costs rise 10% to about $180k a month.	$261k	$17k cushion	Overhead creep cuts the safety margin fast.
Margin pressure	Variable expenses rise from 31% to 36% of revenue.	$256k	$22k cushion	Discounting or rework pushes break-even up.
Combined pressure	Revenue falls 15%, fixed costs rise 10%, and variable expenses rise to 36%.	$282k	$46k gap	This turns the month into about a $29k loss.

Can you prove this dimmer switch business clears break-even before you buy the vehicles and add payroll?

Founder checklist

Before you commit, prove the model can book 43 installs a month at about a $555 ticket, hold CAC near $180, and keep contribution strong enough to reach Month 6 break-even without starving cash.

1Demand Proof43/mo

Verify you can close at least 43 installs a month at about a $555 average ticket, or the model will miss the Month 6 break-even target.

2CAC Test$180

Test paid and referral channels against the Year 1 CAC assumption of $180 before you scale marketing, because the $18,000 first-year budget only works if acquisition stays near plan.

3Fixed Load$16.4k/mo

Keep fixed monthly commitments near $16.4k, including payroll and the Year 1 marketing budget, so overhead stays in line with the forecast before volume ramps.

4Margin Mix69% CM

Verify the job mix still clears about 69% contribution margin after 26% for components and vehicle costs and 5% for commissions and card fees.

5Staff RampMonth 7

Make sure a licensed electrician is covered before Month 7 and that suppliers, booking, route density, inspection rules, warranty work, and safety gear are ready so booked jobs turn into billable hours.

6Cash Cushion$784k

Protect at least $784k of minimum cash because the model bottoms in Month 2, after vehicles, tools, inventory, and setup spend hit before revenue catches up.