Accurate pricing for every window dimension in your home
Window size is the primary cost factor for secondary glazing. Larger windows require more material and labour, significantly impacting the final price. This guide provides detailed pricing for all common window sizes.
| Size | Area | Acrylic | 4mm Glass | 6mm Glass |
|---|---|---|---|---|
| Small Window | 0.54 m² | £80-£135 | £110-£190 | £135-£215 |
| Standard Window | 1.08 m² | £160-£270 | £215-£380 | £270-£430 |
| Large Window | 1.80 m² | £270-£450 | £360-£630 | £450-£720 |
| Patio Door | 3.78 m² | £565-£945 | £755-£1,320 | £945-£1,510 |
| Bay Window (3-panel) | 4.50 m² | £675-£1,125 | £900-£1,575 | £1,125-£1,800 |
* Prices exclude installation. Add installation costs shown in detailed breakdown below.
Typical location: Small bathroom, toilet
Acrylic
£80-£135
4mm Glass
£110-£190
6mm Glass
£135-£215
Installation: £50-£80 per window
Total installed cost: £160 - £295
Typical location: Bedroom, kitchen
Acrylic
£160-£270
4mm Glass
£215-£380
6mm Glass
£270-£430
Installation: £80-£120 per window
Total installed cost: £295 - £550
Typical location: Living room, dining room
Acrylic
£270-£450
4mm Glass
£360-£630
6mm Glass
£450-£720
Installation: £120-£180 per window
Total installed cost: £480 - £900
Typical location: Garden access
Acrylic
£565-£945
4mm Glass
£755-£1,320
6mm Glass
£945-£1,510
Installation: £200-£300 per window
Total installed cost: £955 - £301
Typical location: Traditional living rooms
Acrylic
£675-£1,125
4mm Glass
£900-£1,575
6mm Glass
£1,125-£1,800
Installation: £300-£450 per window
Total installed cost: £1200 - £451
Complex window shapes require custom manufacturing and installation, adding premium costs to standard pricing.
Custom curved glazing required
Example: Standard £300 window becomes £360-£390
Specialist manufacturing needed
Example: Standard £300 window becomes £390-£420
Custom frame angles
Example: Standard £300 window becomes £375-£405
Complex multi-panel system
Example: 3-panel £1,200 becomes £1,680-£1,800
• Consider DIY for small bathrooms and toilets
• Magnetic systems ideal for £80-£150 range
• Bundle multiple small windows for bulk discount
• Acrylic performs well at this size
• Always use professional installation for safety
• 6mm glass justified for acoustic performance
• Sliding systems more cost-effective than hinged
• Consider phasing if budget limited
Measure width and height of the reveal (recess) in millimetres. Take measurements at top, middle, and bottom for width; left, center, and right for height.
Windows are rarely perfectly square. Always use the smallest width and smallest height measurement to ensure the secondary glazing fits.
Multiply width x height (in metres) to get square metres. Example: 1.2m x 1.5m = 1.8m². This determines material cost.
For non-rectangular windows, calculate as if they were rectangular (use maximum dimensions) and add the shape premium (20-40%).