Freelance PLC and controls engineer

Programme and commission control systems for factories and machine builders as a one-person automation business.

Robotic arm assembling parts on a modern automated factory production line.
Startup cost£1.5k to £6k
Monthly revenue£2k to £9k
Time needed15+ h/week
First incomeWeeks
  • £1.5k-6k
  • Part-time
  • Out and about

Estimates for a small start in the UK, not guarantees.

Official data

5,222 UK companies in this field, 17% registered in the last 2 years

SIC 33200 “Installation of industrial machinery and equipment”. Source: Companies House, November 2026.

What it is

You design, programme and commission the control side of automated machines and production lines, such as PLC programs, operator screens and sensor set-ups. You work from home for design and documentation and go to client sites to test and start up equipment.

Your first three steps

  1. Pick one or two PLC brands and sectors you know well, and build a small portfolio of example projects or case studies
  2. Set up as a sole trader or limited company, and get professional indemnity and public liability insurance
  3. Contact former employers, machine builders and automation recruiters to offer short contracts or overflow work
Who pays

Machine builders, factories, food and packaging plants and larger automation firms that need extra engineers.

How it makes money

Day rate or fixed price per project, plus paid callouts for fault-finding and support once a system is running.

Skills that help
  • PLC programming (for example Siemens, Allen-Bradley or similar)
  • Electrical and control systems knowledge
  • Fault-finding under pressure
  • Clear communication with engineers and operators
Watch out for
  • Professional indemnity and public liability insurance, as a programming fault could cause costly downtime
  • Machinery safety rules and standards: check what applies to the equipment you work on, including UKCA or CE marking and risk assessments
  • If you work through agencies, check whether IR35 applies to your contracts
  • Software licences for PLC programming tools can be expensive, so check the cost before you commit
  • Many sites ask for safety inductions or contractor accreditation before you can start, so check requirements early

🔒 Full research report for UK

Real cost breakdown with current prices, licences and registration checklist, local competition, pricing, break-even and a 30-day launch plan, with sources.

Coming soon

Questions people ask

How much does it cost to start as a freelance PLC engineer?

Estimates suggest startup costs are typically around £1,500 to £6,000, depending on your laptop, programming software licences, test equipment and insurance. Software licences for PLC tools can be expensive, so check costs before you commit.

How much can a freelance controls engineer earn?

Monthly revenue is typically around £2,000 to £9,000, depending on how many days you work, the clients you win and your day rate. Estimates suggest a minimum of around 15 hours a week.

What rules should I check before working as a freelance controls engineer?

Check which machinery safety rules and standards apply to your equipment, including UKCA or CE marking and risk assessments. Also check insurance cover, whether IR35 applies to agency contracts, and site induction or accreditation requirements.

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