Self-employed double glazing fitter

Fit windows and doors for local suppliers and window firms, with no showroom or sales side to run.

Startup cost£2k to £8k
Monthly revenue£1.5k to £6k
Time needed20+ h/week
First incomeWeeks
  • £2k-8k
  • Part-time
  • Out and about

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

Official data

7,568 UK companies in this field, 19% registered in the last 2 years

SIC 43342 “Glazing”. Source: Companies House, November 2026.

What it is

You remove old frames and fit new double glazed windows and doors on jobs passed to you by local window companies, fabricators and builders. You turn up with your tools and van, fit to a high standard and leave the selling to others.

Your first three steps

  1. Get your fitting experience on paper, and look at a recognised fitting course or NVQ if you are new to the trade
  2. Get public liability insurance, van cover and a solid set of fitting tools and safe lifting gear
  3. Contact local window firms and fabricators to ask about subcontract fitting work and offer a paid trial job
Who pays

Window and door companies, fabricators, building firms and sometimes landlords or housing contractors.

How it makes money

Usually a fixed price per window or door fitted, or a day rate. Steady work from two or three firms can fill your diary quickly.

Skills that help
  • Accurate measuring and fitting
  • Safe handling of heavy glass and frames
  • Neat finishing and tidying up
  • Reliable timekeeping
Watch out for
  • Public liability insurance, and check what cover the firms you work for expect
  • Check whether you need CSCS or similar cards for building sites
  • Heavy lifting and working at height, so plan safe methods and use proper equipment
  • Check employment status rules (self-employed or not) with HMRC so you are set up correctly
  • Who is responsible for building regulations sign-off on each job, which the supplying firm usually handles but you should confirm
  • Older buildings may contain asbestos or lead paint, so check before removing frames

Deep research report · UK

Everything you need to start: self-employed double glazing fitter

Researched with live web search for United Kingdom: real startup prices, the licences and rules, what others charge, a break-even example, how to find your first customers and a 30-day launch plan. With sources.

  • Startup costs with real prices
  • Licences, registration and rules
  • Pricing: what others charge
  • Break-even example
  • Finding your first customers
  • 30-day launch plan
  • Risks and how to reduce them
Ready in about 2 minutes · one-off payment, tax included

See a full sample report

Questions people ask

How much does it cost to become a subcontract double glazing fitter?

Startup costs are estimated at typically around £2,000 to £8,000, depending on the tools, van and equipment you already have. You leave selling to window firms, so there is no showroom to pay for.

How much can a subcontract window fitter earn?

Monthly revenue is estimated at typically around £1,500 to £6,000, depending on how much work local window companies, fabricators and builders pass to you. The estimate assumes at least about 20 hours a week.

What should I check before starting as a window fitter?

Check public liability insurance and what cover the firms you work for expect. Check whether you need CSCS or similar cards for building sites, and your employment status with HMRC. Also check for asbestos or lead paint before removing frames in older buildings.

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