CNG Vehicle Conversion Shop
Install certified compressed natural gas fuel systems in fleet trucks, vans and private vehicles at a small workshop.
- $60k-250k
- Full-time
- Own premises
- Licence or permit needed
Estimates for a small start in the US, not guarantees.
Official data
3,525 US businesses with employees in this field, -6.1% in a year
NAICS 811118 “Other automotive mechanical and electrical repair and maintenance”. Source: U.S. Census Bureau, County Business Patterns 2023.
What it is
A small garage or workshop that fits EPA-certified compressed natural gas (CNG) conversion kits to gasoline vehicles, so they can run on CNG or both fuels. You also handle fuel system inspections, cylinder checks and servicing.
Your first three steps
- Check which EPA-certified (and CARB-certified, if you are in California) conversion kits cover the vehicles in your area, and contact manufacturers about becoming an authorized installer
- Find out which local fleets run CNG or have CNG fueling nearby, and talk to their fleet managers about their needs
- Ask your city or county planning office and fire marshal what zoning, permits and safety requirements apply to a shop working on gas fuel systems
Who pays
Fleet operators such as delivery companies, utilities, municipalities and school districts, plus some private owners with trucks or vans and access to CNG fueling.
How it makes money
A fee per conversion (kit plus labor), with ongoing income from inspections, cylinder checks, repairs and servicing for the same fleets.
Skills that help
- Automotive mechanical and fuel system experience
- Comfort with safety procedures for pressurized gas
- Selling to fleet managers and handling quotes
Watch out for
- Only install systems certified for the exact vehicle and model year; uncertified conversions can break federal or state emissions rules, so check with the EPA and your state environmental agency
- Installer training and cylinder inspection requirements, check the kit maker's requirements and your state's rules, including relevant NFPA codes
- Garage liability, garagekeepers and general liability insurance, plus workers' compensation once you hire
- Demand depends on nearby CNG fueling stations and fuel price swings, so test local demand before investing in equipment
- Zoning, fire code and hazardous materials rules for your premises, and any state or local business license
🔒 Full research report for US
Real cost breakdown with current prices, licences and registration checklist, local competition, pricing, break-even and a 30-day launch plan, with sources.
Coming soonQuestions people ask
How much does it cost to open a CNG conversion shop?
Startup costs are typically around $60,000 to $250,000, depending on your premises, tools and equipment, and how much you invest before your first jobs. These are estimates, so test local demand before buying equipment.
How much revenue can a CNG conversion shop make?
Monthly revenue is typically around $10,000 to $50,000, depending on how many conversions and services you handle. Demand depends on nearby CNG fueling stations and fuel price swings, so check your local market.
What rules should I check before converting vehicles to CNG?
Check that systems are certified for the exact vehicle and model year with the EPA and your state environmental agency. Also check installer training, cylinder inspection and NFPA code requirements, insurance, and zoning, fire code and hazardous materials rules.
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