Subcontract upvc window fitter
Fit uPVC windows and doors for installers and builders who need skilled extra hands, without selling to homeowners yourself.
- £1.5k-6k
- Part-time
- Out and about
Estimates for a small start in the UK, not guarantees.
Official data
22,443 UK companies in this field, 24% registered in the last 2 years
SIC 43320 “Joinery installation”. Source: Companies House, November 2026.
What it is
You work as a self-employed fitter for window companies, builders and developers. You remove old frames and fit new uPVC windows and doors that the company has supplied, then make good.
Your first three steps
- Get experience or training with an installer, and look at fitter courses such as those linked to FENSA or Certass
- Buy a core set of tools and arrange public liability insurance
- Contact local installers and builders to offer trial days, and register as a sole trader with HMRC
Who pays
Window installation companies, builders, housing developers and landlords' contractors.
How it makes money
Usually a price per window or door fitted, or a day rate. More jobs per week means more income, and you keep costs low because you do not buy the stock.
Skills that help
- Accurate measuring and fitting
- Experience with uPVC frames and glazing
- Reliable and tidy on customers' properties
Watch out for
- Public liability insurance, and check what cover the company you work for expects
- Replacement windows in England and Wales fall under Building Regulations, so check how the work is certified (for example through a competent person scheme) and who is responsible
- Check self-employment status rules with HMRC if you work mainly for one company
- Heavy lifting and working at height, so plan for safe handling and a van or reliable transport
🔒 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 soonQuestions people ask
How much does it cost to become a subcontract uPVC window fitter?
Estimates suggest startup costs typically around £1,500 to £6,000, depending on your tools, transport and insurance. Check what each company you work for expects you to bring, and plan for a van or reliable transport.
What rules should I check before fitting windows as a subcontractor?
Check how the work is certified under Building Regulations in England and Wales, for example through a competent person scheme, and who is responsible. Check public liability cover the company expects, and self-employment status rules with HMRC if you work mainly for one company.
How much can a subcontract window fitter earn?
Estimates suggest monthly revenue typically around £2,000 to £6,000, depending on how much work you get, the rates agreed and the companies you work for. The idea assumes at least around 25 hours a week.
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