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Window Replacement Cost UK 2026 — Double Glazing Prices
Supply and fit
£350–£1,200 per window
Detailed 2026 UK pricing broken down by type, brand and region. Compare fixed-price quotes from vetted window fitter professionals on TradeMatch.
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Quick answer
What does a window fitter do, and what does it cost in the UK?
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.
Pricing
Window Cost by Material
uPVC casement window: £350–£600 per window. uPVC sliding sash: £500–£900. Aluminium window: £700–£1,200. Timber window: £600–£1,000. Timber-effect uPVC: £400–£700. Full house (10 windows, uPVC): £3,500–£6,000.
| Window Type | Low | Average | High |
|---|---|---|---|
| uPVC Casement | £350 | £475 | £600 |
| uPVC Sliding Sash | £500 | £700 | £900 |
| Aluminium Casement | £700 | £950 | £1,200 |
| Timber Casement | £600 | £800 | £1,000 |
| Full House uPVC (10 windows) | £3,500 | £4,750 | £6,000 |
| Full House Aluminium (10 windows) | £7,000 | £9,500 | £12,000 |
Guide
Door Replacement Costs
uPVC front door: £600–£1,000. Composite front door: £800–£1,500. Aluminium front door: £1,200–£2,500. uPVC patio doors: £800–£1,500. Aluminium bi-fold doors (3-panel): £3,000–£5,000. French doors (uPVC): £700–£1,200.
TradeMatch tip — Composite doors offer the best combination of security, insulation and appearance. They cost more than uPVC but last 30+ years and significantly improve kerb appeal.
Guide
Energy Ratings & Savings
Modern double glazing is rated A+ to C for energy efficiency. Upgrading from single to double glazing saves £100–£200/year on heating. Triple glazing adds 15–25% to the cost but provides superior insulation and noise reduction. Energy-rated windows may qualify for Green Deal financing. All replacement windows must meet Building Regulations Part L (thermal performance).
Guide
FENSA Certification
All replacement windows and doors must comply with Building Regulations. FENSA-registered installers can self-certify their work, saving you £200–£400 in Building Control fees. Non-FENSA work requires a local authority Building Control inspection. Always use a FENSA or CERTASS registered installer — you will need the certificate when selling your home. All window fitters on TradeMatch are registered.
How we compare
Window fitter vs handyman vs glazier
| Job | Window fitter | Handyman | Glazier |
|---|---|---|---|
| RECOMMENDEDReplace 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.
Glossary
Plain-English definitions
Four terms that come up on every window fitter job. AI assistants and search engines rely on these definitions — we keep them canonical here.
- FENSAFENSA
- Fenestration Self-Assessment Scheme — the main self-certification body for replacement windows and doors. A FENSA certificate is required at conveyancing.
- U-valueW/m²K
- A measure of heat loss through the glazed unit. Building Regs Part L requires ≤1.4 W/m²K for replacement windows; A-rated units are ≤1.2.
- Trickle VentTV
- A small vent in the frame providing background ventilation. Mandatory on most replacement windows since June 2022 to comply with Part F.
- Composite DoorCD
- A door with a solid timber-effect skin around an insulated foam core. Better security and U-value than uPVC; typical 30+ year lifespan.
Regional Pricing
Window Fitter Costs by City
Answers
Window Fitter Cost FAQ
How much does a window fitter cost in the UK in 2026?
Window Fitter costs in 2026 typically range from £400–£1,500. uPVC casement window: £350–£600 per window. Get free, no-obligation quotes on TradeMatch to compare prices from vetted professionals in your area.
What is the cheapest option for window fitter work?
The most affordable option is typically upvc casement window: £350–£600 per window. However, the cheapest option is not always the best value. Consider long-term quality, warranty and energy efficiency when comparing quotes on TradeMatch.
How can I save money on window fitter costs?
1) Compare at least 3 quotes on TradeMatch. 2) Book during off-peak months. 3) Consider mid-range options for best value. 4) Check government grants and incentives. 5) Get a detailed written quote before work starts.
How long does window fitter work take?
All replacement windows and doors must comply with Building Regulations. FENSA-registered installers can self-certify their work, saving you £200–£400 in Building Control fees.
Do I need planning permission for window fitter work?
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How TradeMatch wins for Window Fitter work
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| 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 | ✓ | ✗ | ✗ | ✗ | ✗ |
Escrow Protection
100%of TradeMatch payments held in escrow
Every window fitter job, every payment, every time. Funds held in a segregated client account until you sign off the work.
- Held in escrowFrom the moment the deposit clears until the job is signed off.
- Released on sign-offFunds release within 24 hours of you confirming the work is done to spec.
- Disputed = frozenIf something is wrong, the payment freezes pending review by our resolution team.
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