Straight stairlifts, curved rails, and accessibility consultations all demand different resources—and your break-even point for each one is entirely different. Knowing when you've covered your costs and when you're actually profitable separates growth from burnout in the home accessibility business. This guide walks you through the math so you can decide what services to add without guessing.
Fixed Costs That Matter
Before you sell a single stairlift, you're already spending money. Licensing, insurance, and warehouse space are non-negotiable overhead—and they don't scale down if business is slow.
A typical stairlift installation business carries:
- General liability and workers' compensation insurance: $2,000–$4,500 annually
- Business licensing and permits: $500–$1,500 per year (varies by state)
- Warehouse or storage space: $800–$2,500 monthly
- Vehicle maintenance and fuel: $300–$800 monthly
- Inventory carrying costs (if you stock units): $1,000–$5,000 monthly
That's roughly $18,000–$50,000 in yearly overhead before you touch a single installation. If you're operating lean from home with no inventory, you're at the lower end. If you're maintaining a showroom and stocking curved rail units, you're higher.
Variable Costs Per Installation
Each job adds costs that change based on the service:
Straight stairlift installations (typically $3,000–$6,000 retail):
- Unit cost: $1,200–$2,800
- Labor: $400–$900 (2–3 hours on-site)
- Permit or inspection: $50–$200
- Rails, brackets, custom hardware: $150–$400
- Total per unit: $1,800–$4,300
Curved rail systems ($5,500–$15,000 retail):
- Unit cost: $3,500–$8,500
- Shop time for rail fabrication: $500–$1,500
- Installation labor: $800–$1,500 (4–6 hours)
- Hardware and fasteners: $200–$500
- Total per unit: $5,000–$11,500
Accessibility consultations (charged at $150–$400 per hour):
- Your time only (no inventory risk)
- Minimal overhead beyond your salary
Notice the difference: curved systems tie up capital and labor. Consultations are pure margin after your base costs.
Calculate Your Break-Even Volume
Here's the practical math:
Scenario: You operate lean with $2,500/month fixed overhead ($30,000 annually).
If you install straight stairlifts at an average gross profit of $1,500 per unit (retail $4,000 – costs $2,500):
- Break-even = $30,000 ÷ $1,500 = 20 installations per year, or 1–2 per month
If you add curved systems at $3,000 gross profit per unit:
- You only need 10 installations annually to cover fixed costs
- But you also need enough capital to stock inventory ($5,000–$15,000)
If you layer in consultations at $300/hour with zero additional overhead:
- A single 4-hour consultation clears $1,200 gross profit
- 5 consultations per year cover your entire fixed cost
The point: consultations and maintenance contracts are your fastest break-even plays. New installations are higher-revenue but require more capital and labor.
When to Add a New Service Line
Expand a service only when your current work consistently covers fixed costs with breathing room.
Add straight stairlift installations when:
- You have 2+ reliable customers requesting them monthly
- You can source units at acceptable margin (35–50% markup minimum)
- You have a van, basic tools, and time to do 2–3 jobs/month
Add curved systems when:
- You've proven you can install straight units profitably
- You have $10,000–$20,000 in working capital for inventory
- You've trained on rail fabrication or partnered with a fabricator
- You already have 3+ curved-system leads in pipeline
Add maintenance contracts when:
- You have 15+ installed units in your service area
- You can commit to quarterly or semi-annual visits ($75–$150/visit per customer)
- It creates recurring revenue that stabilizes cash flow
Track Your Numbers Weekly
Don't wait for tax season to understand your margins. Use a simple spreadsheet:
- Date, customer name, service type
- Retail price charged
- Direct costs (unit, labor, materials)
- Gross profit
- Installation hours
Review it every Friday. If you're hitting 40%+ gross margin on the first five jobs, you've validated the service. If you're at 20%, something's wrong—your pricing is too low or your sourcing costs are too high.
Frequently Asked Questions
Q: How much working capital do I need to stock curved rail units? A: Budget $8,000–$20,000 for 3–4 units as inventory. Start with one unit, sell it, reinvest profits. Many successful shops take 6–12 months to build stock this way.
Q: Should I partner with installers or hire full-time staff? A: Start with 1099 contractors until you're consistently running 4+ jobs/month. Full-time hiring adds $35,000–$50,000 in payroll overhead annually.
Q: What's the fastest path to profitability in this niche? A: Sell accessibility consultations and home assessments first (no inventory). Add installations only once you've booked 20+ consultations and validated local demand.
Start with the service that matches your current capital and labor. Track your break-even number ruthlessly, and expand only when you've proved you can run the previous service profitably. Listing your services on Mercoly helps you get found by customers actively searching for stairlift and accessibility solutions in your area—accelerating the volume you need to hit profitability.