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Business ideas

Side hustle ideas for engineers

5 ideas, ranked. Strongest: Machine Shops Buy Quote Scripts. Click through to explore this as a live bubble map, grow any idea further, or re-score it for your situation.

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Ranked by overall score (1-10), the average of Market size, Ease to start, Profit potential.

  1. Machine Shops Buy Quote Scripts

    6.7

    Build paid CAD-to-quote spreadsheets that cut estimating time for shops handling repetitive parts.

    Market size 6/10Ease to start 8/10Profit potential 6/10
    • CNC Shops Buy Material Estimators

      7.0

      Charge $300 per setup to price stock, kerf, and scrap from uploaded DXF files.

      Market size 6/10Ease to start 8/10Profit potential 7/10
    • Job Shops Buy Tolerance Risk Checks

      6.0

      Sell a $49-per-part spreadsheet that flags tight tolerances driving extra machining operations.

      Market size 5/10Ease to start 7/10Profit potential 6/10
    • Prototype Shops Buy Rush Quote Tools

      6.0

      A $500 template can price overtime and machine-slot displacement using each shop’s historical jobs.

      Market size 4/10Ease to start 6/10Profit potential 8/10
  2. Factories Buy PLC Backup Audits

    6.3

    Charge $1,500 per site to document obsolete controller programs before a breakdown strands production.

    Market size 5/10Ease to start 6/10Profit potential 8/10
    • Plants Buy Drive Swap Plans

      7.0

      Sell a fixed-fee compatibility check that identifies stocked replacements for aging motor drives.

      Market size 6/10Ease to start 8/10Profit potential 7/10
    • Food Packers Buy Sensor Calibration

      6.3

      Charge per production line and include traceable records that simplify food-safety audits.

      Market size 5/10Ease to start 6/10Profit potential 8/10
    • Water Utilities Buy Pump Energy Checks

      5.0

      Offer a one-day metered assessment with savings estimates tied to each pump’s operating hours.

      Market size 4/10Ease to start 5/10Profit potential 6/10
  3. Landlords Buy Heat-Loss Reports

    6.0

    Use a thermal camera and fixed-fee audits to identify insulation upgrades for small multifamily owners.

    Market size 6/10Ease to start 7/10Profit potential 5/10
    • Owners Buy Boiler Tune-Up Checks

      6.7

      Charge $250 per building to measure combustion efficiency and flag oversized or failing boilers.

      Market size 6/10Ease to start 8/10Profit potential 6/10
    • Landlords Buy Water-Leak Sensor Maps

      6.3

      Sell a $400 sensor-placement plan that reduces burst-pipe claims in older multifamily buildings.

      Market size 5/10Ease to start 7/10Profit potential 7/10
    • Owners Buy Window Retrofit Paybacks

      5.7

      Price reports at $600 and compare sash repairs, inserts, and replacements using measured air leakage.

      Market size 4/10Ease to start 5/10Profit potential 8/10
  4. Labs Buy Custom Test Fixtures

    6.0

    Sell one-off fixtures to university labs, then reuse proven designs across departments for repeat orders.

    Market size 4/10Ease to start 7/10Profit potential 7/10
  5. Solar Installers Buy Permit Drawings

    6.0

    Charge per residential project for stamped electrical plans, partnering with a licensed engineer where required.

    Market size 7/10Ease to start 3/10Profit potential 8/10

Generated with Idea Bubbles. Created 2026-10-17.