Aluminium window supply and fit business
Measure, order and fit made-to-measure aluminium windows for homeowners and small builders, without running your own factory.
- £3k-12k
- Part-time
- Out and about
Estimates for a small start in the UK, not guarantees.
Official data
1,649 UK companies in this field, 24% registered in the last 2 years
SIC 25120 “Manufacture of doors and windows of metal”. Source: Companies House, November 2026.
What it is
You survey the property, order made-to-measure aluminium windows from a trade fabricator or system supplier, then fit them and make good. You are the face of the job and the fitter, but you don't make the frames yourself.
Your first three steps
- Open trade accounts with two or three aluminium window fabricators and ask for sample corners, price lists and lead times
- Check which competent person scheme or Building Control route applies where you work, and get quotes for public liability insurance
- Line up a first few jobs through friends, local builders and architects, and photograph your finished work for a simple website
Who pays
Homeowners doing renovations or extensions, self-builders, small builders and landlords who want slim, modern frames.
How it makes money
A fixed quote per job that covers the windows, fitting, waste removal and your margin. Larger jobs usually take a deposit and stage payments.
Skills that help
- Accurate measuring and surveying
- Fitting windows safely and neatly
- Quoting and customer service
- Basic paperwork and record keeping
Watch out for
- Replacement windows in England and Wales generally need to meet Building Regulations, so check whether you need to join a competent person scheme. Scotland and Northern Ireland have different systems
- Public liability insurance, plus cover for any guarantees or warranties you offer
- Safe working at height and manual handling of heavy glazed units
- Take deposits sensibly and put payment terms and cancellation rights in writing. Check the consumer rules for home sales
- Measuring mistakes on made-to-order windows can be expensive, so double-check every survey
Deep research report · UK
Everything you need to start: aluminium window supply and fit
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
Questions people ask
How much does it cost to start an aluminium window fitting business?
Startup costs are typically around £3,000 to £12,000, depending on your tools, vehicle, insurance and how much you set aside for early jobs. These are estimates, so build a budget around the type of work you plan to take on.
How much can I earn supplying and fitting aluminium windows?
Monthly revenue is typically estimated at around £2,000 to £10,000, depending on how many jobs you win, their size and the hours you work. Costs such as ordering made-to-measure windows come out of that revenue.
What rules should I check before fitting replacement windows?
Replacement windows in England and Wales generally need to meet Building Regulations, so check whether you need a competent person scheme. Scotland and Northern Ireland differ. Also check public liability insurance, safe working at height and consumer rules for deposits.
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