How to Become a Window Fitter in the UK (2026 Guide)
Overview
Window fitting is a specialized trade focused on installing replacement windows, doors, and glazing systems in domestic and commercial properties. With the UK government's push for energy efficiency and millions of homes needing double or triple glazing upgrades, window fitters are in strong demand. The work combines practical installation skills with knowledge of building regulations, thermal performance, and customer service. It's rewarding work with good progression into running your own window installation business.
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Step-by-Step Career Path
Get Glazing Qualifications
Complete an NVQ Level 2 in Glazing or Window Installation. This covers fenestration (window and door) installation, measuring, and compliance with building regulations. The Glass and Glazing Federation offers approved courses.
Learn Different Window Systems
Gain experience with uPVC, timber, and aluminium windows. Each material has different installation techniques and tools. Learn both new build and retrofit installation methods.
Understand Building Regulations
Window installation must comply with Part L (thermal performance) and Part F (ventilation) of building regulations. FENSA or CERTASS schemes allow self-certification of compliance.
Get Your CSCS Card
Required for working on construction sites. Your glazing NVQ qualifies you for the Blue Skilled Worker card.
Gain Survey and Measuring Skills
Learn to accurately survey and measure for replacement windows. Mistakes in measuring are expensive and damage your reputation. Many fitters specialize in surveys as well as installation.
Progress Your Career
Experienced window fitters can become team leaders, start their own installation companies, or specialize in commercial glazing for higher earnings.
Qualifications Needed
- ✓NVQ Level 2 in Glazing/Window Installation
- ✓CSCS Blue Card
- ✓FENSA or CERTASS Installer Card
- ✓Working at Height Certificate
- ✓Manual Handling Certificate
- ✓Driving Licence (essential)
Pros & Cons
✅ Pros
- Strong demand from energy efficiency upgrades
- Good earnings potential — £150-250/day self-employed
- Immediate visible results and customer satisfaction
- Indoor and outdoor work variety
- Can build own window installation business
- Growing market with government energy efficiency drives
❌ Cons
- Heavy lifting and carrying of windows and doors
- Working at height for upper floor installations
- Precision required — measurement mistakes are costly
- Weather-dependent for external work
- Competition from large national window companies
- Customer sales pressure if working for commission-based companies
Frequently Asked Questions
How much do window fitters earn in the UK?▼
Employed window fitters earn £26,000-£38,000. Self-employed window fitters typically earn £150-£250 per day. Those running successful window installation businesses can earn £40,000-£60,000+ annually by managing teams and focusing on sales and project management.
Do I need FENSA certification?▼
Individual fitters don't need FENSA certification, but companies installing replacement windows must be FENSA or CERTASS registered to self-certify compliance with building regulations. Working for a registered company gives you valuable experience of compliant installation.
What tools do window fitters need?▼
Essential tools include spirit levels, measuring tapes, packers and wedges, sealant guns, trim routers, and basic power tools. A van or large vehicle is essential for transporting windows. Total tool investment is typically £2,000-£4,000 for a complete kit.
Is window fitting physical work?▼
Yes, it involves lifting and maneuvering heavy windows and doors, often on ladders or scaffolding. Large windows require two-person teams. However, modern installation techniques and equipment have reduced the physical demands compared to older methods.
What's the career progression for window fitters?▼
Experienced fitters can become team leaders, estimators (surveying and measuring), or start their own installation companies. Some specialize in commercial glazing, heritage windows, or move into window manufacturing and design roles.
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