Summer 2026: Replace old windows now. New double glazing keeps your home cool in summer and warm in winter.
Get Window QuotesA window fitter supplies and installs replacement windows and doors. Replacement glazing is notifiable under the Building Regulations, so it must be either self-certified by a FENSA or CERTASS registered installer or signed off by the council. The certificate is one a buyer’s solicitor will ask for, and obtaining a retrospective one is slower and dearer than getting it at the time.
Double glazing, window replacement and door installation. Compare quotes from vetted window fitter professionals across the UK. Typical cost: £400–£1,500.
Searching for double glazing installer or glazier? That is the same work — every window fitter listed here covers it.

Quick answer
A window fitter measures, supplies and installs replacement double or triple-glazed windows and external doors, then self-certifies under FENSA or CERTASS. UK 2026 cost: £350–£600 per uPVC window, £700–£1,200 aluminium, £600–£1,000 timber. Whole-house uPVC for 10 windows runs £3,500–£6,000. FENSA registration is mandatory for selling on.
| Job | Window fitter | Handyman | Glazier |
|---|---|---|---|
| Replace whole window | ✅ Recommended | ❌ Not legal (FENSA) | ⚠️ Glass-only |
| Replace cracked pane | ✅ Yes | ⚠️ Limited | ✅ Recommended |
| Adjust hinges / replace handle | ✅ Yes | ✅ Yes | ⚠️ Possible |
| Bi-fold doors | ✅ Recommended | ❌ Not legal | ❌ Not glass-only |
| FENSA certificate | ✅ Issued | ❌ No | ❌ No |
Replacement windows are notifiable building work. A FENSA or CERTASS-registered fitter saves you the £200–£400 Building Control fee and issues the certificate at the end.
A window fitter provides double glazing, window replacement and door installation. Whether you need routine maintenance, emergency repairs, or a major installation project, a qualified window fitter has the skills, tools and experience to complete the work safely and to a high standard. On TradeMatch, every window fitter is vetted, background-checked, and holds verified public liability insurance — giving you peace of mind that your project is in safe hands.
When hiring a window fitter, always verify their qualifications. The following are the key credentials and trade body memberships regulated by FENSA / CERTASS:
On TradeMatch, we verify all of these credentials before any window fitter can quote on jobs.
Every tradesperson is verified against the UK accreditation bodies that matter for the work — before they can quote.

Use this checklist before hiring a window fitter to ensure you get quality work at a fair price:
Watch out for these warning signs when getting quotes for window fitter work:
TradeMatch eliminates these risks — every window fitter is vetted, insured, and payments are escrow-protected.
You can hire a window fitter at any time of year, but planning ahead and booking during off-peak months (typically late autumn to early spring) can help you get better availability and potentially lower prices. For emergency work, TradeMatch has professionals available for same-day callouts.
Browse vetted window fitter professionals across 200 UK cities.
UPVC, aluminium and timber double glazed window supply and installation
£300–£800Triple glazed window installation for superior insulation and noise reduction
£500–£1,200Composite, UPVC and aluminium front, back and patio door fitting
£500–£2,500Conservatory window replacement, roof glazing and bi-fold door installation
£1,000–£5,000Tell us what window fitter work you need — it only takes 2 minutes.
Receive up to 3 quotes from vetted window fitter professionals near you.
Compare reviews, choose the best quote, and leave a review when the job is done.
Browse questions from homeowners about hiring a window fitter, costs, and what to expect.
Side-by-side with the four most-searched UK trade platforms. No subscription fees, up to 5 competing quotes, escrow-protected payments — three things every other platform misses.
| Feature | TradeMatch | Checkatrade | MyBuilder | Bark | Rated People |
|---|---|---|---|---|---|
| Up to 5 quotes | ✓ | Browse | Up to 5 | Varies | Up to 3 |
| Escrow payment protection | ✓ | ✗ | ✗ | ✗ | ✗ |
| No tradesperson subscription | ✓ | £50+/mo | ✓ | Credits | £15+/mo |
| Verified reviews (live) | ✓ | 5-day delay | ✓ | Mixed | ✓ |
| Background + qualification checks | ✓ | ✓ | Light | Basic ID | ✓ |
| Dispute resolution team | ✓ | ✗ | ✗ | ✗ | ✗ |