Large Window Cost / Picture Window Cost
Large picture windows can transform the look and feel of your property - the average project costs around £3,000 to £5,000, although that could be considerably higher if you want a full-width reinforced glass wall across your property!
This guide explains some of the most relevant cost factors, additional expenses you may need to factor in, and the advantages of investing in a professionally installed picture window.
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The size of your window will be the primary cost - picture windows can be slim, tall glazing panels fitted into hallways or huge expansive windows that replace a brick wall on one aspect of your home. It's tricky to give an accurate price indication since there are so many variables involved, so below, we've included the average prices for the three most popular window frame materials - UPVC, aluminium and timber, depending on the size of the frame.
| Frame type | 60 cm x 90 cm | 90 cm x 120 cm | 120 cm x 120 cm |
| UPVC | £250 - £400 | £400 - £600 | £650 - £900 |
| Timber | £850 - £1,000 | £1,200 - £1,400 | £1,350 - £1,500 |
| Aluminium | £550 - £700 | £650 - £800 | £750 - £1,000 |
UPVC frames are the most affordable option. It normally costs between £3,000 and £5,000 to replace the windows in a three-bedroom house - but without checking the style, style and window type you'd like for your picture window, it's impossible to give a definitive price. We'll talk about glazing shortly, but note that large windows will usually require laminated glass that is tough enough to withstand impacts.
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Additional Considerations in Fitting Large Windows
If you decide to replace an existing picture window with a new frame and glazing, the costs will be lower than cutting through the brickwork.
Costs may include:
- Lintels or support beams to bear the weight of the large sheets of glazing.
- Planning permission where required.
- Waste removal to dispose of the old window and brickwork.
- Electrical or plumbing costs if you have wiring running through the wall cavity.
- Scaffolding if your window fitters cannot easily access the wall.
- Plastering and redecorating to make good the finish around the frame.
Another big factor is the type of window you have - you might go for a solid glass wall without any moving parts. The glass is likely to be more expensive (very large panes may be custom-made), but you won't need to pay for security locks.
You could also opt for a moving window that you can open in smaller panels or a large window that functions as a conventional model.
Below, we've collated average prices for different window styles and sizes, depending on your preferred opening functionality.
Average Large Casement Window Prices
| Window style | Window size | Price (excluding installation) |
| Fixed | 50 cm x 50 cm | £150 - £200 |
| Fixed | 100 cm x 100 cm | £200 - £250 |
| Fixed | 120 cm x 120 cm | £250 - £300 |
| One opening panel | 50 cm x 50 cm | £250 - £300 |
| One opening panel | 100 cm x 100 cm | £275 - £325 |
| One opening panel | 120 cm x 120 cm | £350 - £400 |
| French doors | 50 cm x 50 cm | £450 - £500 |
| French doors | 100 cm x 100 cm | £500 - £550 |
| French doors | 120 cm x 120 cm | £525 - £575 |
Average Large Sash Window Prices
| Window size | Price (excluding installation) |
| 50 cm x 50 cm | £550 - £625 |
| 100 cm x 100 cm | £650 - £725 |
| 120 cm x 120 cm | £750 - £850 |
Average Large Tilt and Turn Window Prices
| Window size | Price (excluding installation) |
| 80 cm x 80 cm | £450 - £500 |
| 100 cm x 100 cm | £500 - £550 |
| 120 cm x 120 cm | £550 - £600 |
Average Large Bay Window Prices
| Window style | Window size | Price (excluding installation) |
| Three sections | 240 cm x 120 cm | £1,000 - £1,200 |
| Three sections | 300 cm x 130 cm | £1,200 - £1,300 |
| Three sections | 300 cm x 150 cm | £1,300 - £1,400 |
| Four sections | 300 cm x 120 cm | £1,500 - £1,600 |
| Four sections | 360 cm x 120 cm | £1,600 - £1,700 |
| Four sections | 360 cm x 150 cm | £1,700 - £1,800 |
| Five sections | 360 cm x 120 cm | £1,900 - £2,200 |
| Five sections | 400 cm x 120 cm | £2,000 - £2,300 |
| Five sections | 400 cm x 150 cm | £2,100 - £2,400 |
Average Large Bow Window Prices
| Window style | Window size | Price (excluding installation) |
| Three sections | 240 cm x 120 cm | £1,100 - £1,200 |
| Three sections | 300 cm x 120 cm | £1,200 - £1,300 |
| Three sections | 300 cm x 150 cm | £1,300 - £1,400 |
| Four sections | 300 cm x 120 cm | £1,500 - £1,600 |
| Four sections | 360 cm x 120 cm | £1,600 - £1,700 |
| Four sections | 360 cm x 150 cm | £1,700 - £1,800 |
| Five sections | 360 cm x 120 cm | £1,900 - £2,100 |
| Five sections | 400 cm x 120 cm | £2,000 - £2,200 |
| Five sections | 400 cm x 150 cm | £2,100 - £2,300 |
Picture Window Glazing Types Average Large Casement Window Prices
| Window style | Window size | Price (excluding installation) |
| Fixed | 50 cm x 50 cm | £150 - £200 |
| Fixed | 100 cm x 100 cm | £200 - £250 |
| Fixed | 120 cm x 120 cm | £250 - £300 |
| One opening panel | 50 cm x 50 cm | £250 - £300 |
| One opening panel | 100 cm x 100 cm | £275 - £325 |
| One opening panel | 120 cm x 120 cm | £350 - £400 |
| French doors | 50 cm x 50 cm | £450 - £500 |
| French doors | 100 cm x 100 cm | £500 - £550 |
| French doors | 120 cm x 120 cm | £525 - £575 |
Average Large Sash Window Prices
| Window size | Price (excluding installation) |
| 50 cm x 50 cm | £550 - £625 |
| 100 cm x 100 cm | £650 - £725 |
| 120 cm x 120 cm | £750 - £850 |
Average Large Tilt and Turn Window Prices
| Window size | Price (excluding installation) |
| 80 cm x 80 cm | £450 - £500 |
| 100 cm x 100 cm | £500 - £550 |
| 120 cm x 120 cm | £550 - £600 |
Average Large Bay Window Prices
| Window style | Window size | Price (excluding installation) |
| Three sections | 240 cm x 120 cm | £1,000 - £1,200 |
| Three sections | 300 cm x 130 cm | £1,200 - £1,300 |
| Three sections | 300 cm x 150 cm | £1,300 - £1,400 |
| Four sections | 300 cm x 120 cm | £1,500 - £1,600 |
| Four sections | 360 cm x 120 cm | £1,600 - £1,700 |
| Four sections | 360 cm x 150 cm | £1,700 - £1,800 |
| Five sections | 360 cm x 120 cm | £1,900 - £2,200 |
| Five sections | 400 cm x 120 cm | £2,000 - £2,300 |
| Five sections | 400 cm x 150 cm | £2,100 - £2,400 |
Average Large Bow Window Prices
| Window style | Window size | Price (excluding installation) |
| Three sections | 240 cm x 120 cm | £1,100 - £1,200 |
| Three sections | 300 cm x 120 cm | £1,200 - £1,300 |
| Three sections | 300 cm x 150 cm | £1,300 - £1,400 |
| Four sections | 300 cm x 120 cm | £1,500 - £1,600 |
| Four sections | 360 cm x 120 cm | £1,600 - £1,700 |
| Four sections | 360 cm x 150 cm | £1,700 - £1,800 |
| Five sections | 360 cm x 120 cm | £1,900 - £2,100 |
| Five sections | 400 cm x 120 cm | £2,000 - £2,200 |
| Five sections | 400 cm x 150 cm | £2,100 - £2,300 |
Picture Window Glazing Types
Most large windows will require reinforced glass - regulations dictate the acceptable glazing standards when the glass is within a certain distance of floor level.
It's also advisable since you need a tough glass wall that isn't a safety or security risk and can withstand impacts and poor weather conditions for the years to come.
Double-glazing is the standard, but an installer will usually quote for laminated glass since it's extremely tough and well suited to picture window projects.
Other options include acoustic glass to redirect external noise away from your home, secondary glazing (if you're upgrading an existing picture window) or eco-friendly films that help preserve energy and avoid UV damage.
Different treatments, films or glazing add to your cost, but the essential requirement is that your glass fits the compliance requirements and is suitable for a large-scale glazing space.
Comparing Picture Window Quotations
Given that a large window is an investment in your property, you should check that each short-listed installer has provided a comprehensive quotation with an itemised breakdown, so you know exactly what's included in the price.
Examples include:
- A survey of your property to establish any necessary preparatory works.
- Supply of your window frames and the windowsill to sit underneath.
- Energy-efficiency rating certifications or testing.
- Security features - including locks and bolts.
- Glass to your specification, whether obscured, toughened, standard or triple-glazed.
- Handles and trim accessories.
- Installation and labour costs - for the total number of fitters required.
- Registration with FENSA or CERTASS with the appropriate certificates.
- Removing the old windows and disposing of the glass and frame safely.
- Cutting through brickwork as required to extend the size of the opening.
- Building regulation compliance or self-certification.
It's usually best to review at least three quotations to be sure you're paying a reasonable price for your picture window installation.
Benefits of Choosing Picture Windows for Your Home
Large windows open up amazing views, flood your home with natural light, and can be a statement focal point to make your property stand out.
Although this size of window is more expensive than standard double-glazing, it provides several extra benefits:
- Picture windows make narrow spaces look significantly larger. A large glazing panel makes a cramped space feel more generous, and you can take advantage of this design perk by fitting slimline curtains to avoid eating into the view.
- The more glazing you have, the more natural light you invite in - proven to be an important factor in health and wellbeing! You can choose from a huge range of glass options to boost energy efficiency while enhancing ventilation and ensuring your property remains warm and comfortable.
- Design flexibility is key, and huge windows can be created with a bespoke design to fit your home perfectly. Removing blocky walls and brickwork ensures you reimagine the feeling of your property, with multiple upgrades and finishes available.
Some popular options include adding awning windows around the outside of the picture window frame, using classic timber (or wood grain UPVC) for a heritage look, or building sleek aluminium picture windows for an ultra-modern property renovation.
This video shows you a few of the different types of large windows available:
Frequently Asked Questions - Large Window / Picture Window Cost
Below we run through the answers to some frequently asked questions about installing a picture window, or a large window, within your property.
Are Picture Windows Affordable?
Large windows can be surprisingly affordable - and sometimes a similar price to replacing a hung window or a casement window unit of a similar size.
Although the glass is more expensive, you're not paying for all the moving parts and the extra components - such as locks, hinges and window sills.
The highest costs come with the glass - if you have a huge oversized window beyond any standard glazing dimensions, your fitter may need to import the glass or have it custom made.
Can I Get a Picture Window That Opens?
Yes, you can! Many homeowners like the idea of expansive glass and natural light but don't want to sacrifice ventilation or have rooms with poor air quality that overheat in the summer.
Although not technically a picture window, you can fit large glazing within a bigger frame, with some moving panels and some static.
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