Double glazing is a popular investment for homeowners and businesses across the UK, offering improved energy efficiency, noise reduction, and security. However, the cost of double glazed windows can vary significantly depending on the material, style, size, number of windows, and installation complexities. Below is a full list of prices and considerations for both residential and commercial properties.
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Average cost of double glazed windows in the UK
The typical cost for a standard double glazed window in the UK ranges between £250 and £750 per window, including supply and installation. However, prices can differ based on frame material and window type.
| Frame material | Average cost per window (supply and fit) |
|---|---|
| uPVC | £250–£500 |
| Aluminium | £400–£650 |
| Timber | £600–£750 |
Note: These prices are per window and based on a standard casement design. Bespoke or larger windows will cost more.
Example total project costs for homes and businesses
| Property type | Project details | Estimated total cost (including supply, fit, and basic extras) |
|---|---|---|
| 2-bed flat (home) | 6 uPVC casement windows | £1,800–£3,000 |
| 3-bed semi-detached house (home) | 8 uPVC casement windows + 1 uPVC front door | £3,000–£5,000 |
| 4-bed detached house (home) | 12 mixed windows (casement, bay, tilt and turn) + 2 doors | £5,000–£9,000 |
| Small retail shopfront (business) | 2 large aluminium display windows + 1 glass door | £4,500–£7,500 |
| Medium-sized office block (business) | 25 aluminium windows, standard safety glazing | £20,000–£30,000 |
| Warehouse or industrial unit (business) | 10 toughened windows + fire doors | £7,000–£12,000 |
Notes:
- These ranges include basic installation, disposal of old windows, and standard double glazing, but excludemajor structural works or highly bespoke designs.
- Triple glazing, coloured frames, or high-security upgrades would add typically 10–30% to these totals.
- Businesses needing out-of-hours fitting or specialist access equipment (e.g. cherry pickers for high façades) should budget extra, typically £1,000–£3,000 depending on complexity.
Price breakdown by window style
The style of window has a notable impact on cost:
| Window style | Average cost per window |
|---|---|
| Casement window | £250–£500 |
| Sash window | £550–£900 |
| Tilt and turn window | £400–£650 |
| Bay window | £1,200–£2,400 (for 3–5 sections) |
Additional fees to consider
When budgeting for double glazing, it is important to factor in potential additional costs:
| Fee type | Typical cost |
|---|---|
| Survey fee | £100–£250 (sometimes waived if proceeding with installation) |
| Installation labour (if separate) | £150–£250 per day, per fitter |
| Removal and disposal of old windows | £50–£100 per window |
| Structural modifications (e.g. enlarging window openings) | £200–£600+ depending on complexity |
| Upgraded locking systems | £30–£100 per window |
| Coloured or wood-effect frames | 10–20% premium on standard frame prices |
| Triple glazing upgrade | Additional £100–£200 per window |
Some suppliers will include many of these extras within their quoted price, so it is important to check exactly what is covered.
Commercial double glazing costs
For businesses, the cost of double glazing is generally higher due to larger windows, specialised safety glass requirements, or commercial-grade frames.
| Commercial window type | Average cost per unit (supply and fit) |
|---|---|
| Standard commercial uPVC | £400–£600 per window |
| Aluminium shopfront windows | £800–£1,500 per window |
| Glass curtain walling | £500–£1,000 per square metre |
| Safety or toughened double glazing | £100–£150 per square metre extra |
Business installations often also require:
- Health and safety assessments: £200–£500
- Out-of-hours installation (to minimise disruption): additional 10–20% surcharge
- Access equipment (e.g. scaffolding, cherry pickers): £500–£2,000, depending on site complexity
Factors affecting the price of double glazed windows
Several variables will impact the total price you pay:
- Size and quantity: Larger windows and more units naturally increase costs.
- Glazing options: Low-E coatings, acoustic glazing, or toughened glass add to the price.
- Energy efficiency ratings: Higher-rated windows (A or A++) usually cost more upfront but offer better long-term savings.
- Location: Costs in London and the South East tend to be 10–20% higher than in other regions.
- Installer choice: National companies often charge more than local independent installers, though guarantees and aftercare may vary.
Ongoing costs and maintenance
Double glazed windows are relatively low maintenance, but you should budget for:
- Cleaning: Regular cleaning recommended (DIY or professional service at approx. £30–£60 per visit for homes, £50–£200 for commercial premises).
- Repairs: Sealed unit replacements (if condensation builds inside the glass) cost £100–£250 per unit.
- Repainting or refinishing (for timber frames): every 5–8 years, costing around £300–£600 for a full house.
Final tips for getting the best value
- Always obtain at least three quotes and ensure they are like-for-like.
- Check certifications such as FENSA or CERTASS to ensure compliance with building regulations.
- Ask about guarantees – reputable installers offer 10–20 year guarantees on frames and glazing units.
- Negotiate – larger projects, particularly commercial ones, often allow room for discounts.