What is the Cost of Double Glazed Sash Windows?
Double glazed sash windows remain one of the most popular window styles for homeowners in Leicester and across the UK.
Their timeless design makes them ideal for period properties, Victorian terraces, and traditional homes. However, modern uPVC and aluminium sash options also make them a fantastic choice for new builds and contemporary properties.
If your existing sash windows are draughty, difficult to open, or suffering from rot or condensation, replacing them can:
- Improve energy efficiency
- Reduce outside noise
- Increase security
- Add value to your home
- Enhance kerb appeal
So, how much do double glazed sash windows cost in 2026?
Average Cost of Double Glazed Sash Windows UK
The average cost of double glazed sash windows in the UK is around £1,300 per window.
However, the final price depends heavily on material choice.
Typical Price Ranges:
- uPVC sash windows: £600 – £800 per window
- Aluminium sash windows: £900 – £1,400 per window
- Timber sash windows: £1,500+ per window
These figures include supply and installation but are only ballpark estimates.
For an accurate quote, it’s always best to speak to a trusted local installer in Leicester who can assess your property properly.
You may also find our guide helpful: Cost of Double Glazing a 3 Bed House UK.
What Affects the Cost of Double Glazed Sash Windows?
Several factors influence the final price of replacing sash windows.
1. Frame Material (Profile)
The biggest pricing factor is material choice.
uPVC Sash Windows
- Most cost-effective option
- Low maintenance
- Energy efficient
- Available in woodgrain finishes
- No repainting required
Many Leicester homeowners choose woodgrain uPVC to replicate traditional timber at a lower cost.
Timber Sash Windows
- Traditional and authentic appearance
- Often required for listed buildings
- Higher maintenance
- Most expensive option
Aluminium Sash Windows
- Slim, modern aesthetic
- Strong and durable
- Mid-to-high price range
2. Colour & Finish
White uPVC is the most affordable option.
Coloured frames or woodgrain finishes typically cost 30–40% more than standard white.
Special finishes, heritage colours, or dual-colour frames (different inside and outside) also increase cost.
3. Size & Number of Windows
Naturally, larger windows cost more.
Replacing a full house of sash windows in Leicester will cost significantly more than replacing one or two units.
However, installing multiple windows at once can often reduce labour costs per window.
4. Glazing Specification
Most homeowners choose double glazing, but you can upgrade to:
- Acoustic glass (for noise reduction)
- Low-E energy efficient glass
- Triple glazing
- Decorative or frosted glass
Upgraded glass units increase cost but improve comfort and performance.
5. Installation Complexity
Installation costs vary depending on:
- Whether you’re replacing like-for-like
- Structural alterations required
- Access to upper floors
- Condition of existing frames
Removing old timber sash windows can be more labour-intensive than replacing modern uPVC units.
Always choose an accredited installer – cheaper quotes don’t always mean better quality workmanship.
Are Sash Windows More Expensive Than Casement Windows?
Yes, generally sash windows cost more than standard casement windows.
This is due to:
- More complex opening mechanisms
- Additional moving components
- Traditional styling features
However, they often add greater character and value to period homes.
Can Old Sash Windows Be Double Glazed?
Yes , in many cases, original sash windows can be retrofitted with double glazing. This may require modifications to accommodate thicker glazing units.
If your property is listed or in a conservation area in Leicester, you may need planning approval before carrying out work. Always consult a professional installer before proceeding.
How Long Do Double Glazed Sash Windows Last?
Modern double glazed sash windows can last 20–30 years or more, depending on the material and maintenance.
- uPVC: 25–30 years
- Aluminium: 30+ years
- Timber: 20–30 years with proper care
High-quality installation plays a major role in the lifespan.
Are Double-Glazed Sash Windows Worth It?
Yes, especially for older Leicester homes where appearance and energy efficiency are both important.
Benefits include:
- Lower heating bills
- Reduced condensation
- Improved security
- Less external noise
- Increased property value
- Enhanced kerb appeal
For many homeowners, they strike the perfect balance between traditional aesthetics and modern performance.
Cost of Double Glazed Sash Windows in Leicester
While national averages are helpful, pricing in Leicester and Leicestershire can vary depending on:
- Property age
- Installation access
- Window size
- Specification level
The best way to get an accurate price is through a local survey.
Get a Quote From Phair Windows
At Phair Windows, we’ve been supplying and installing double glazed windows in Leicester for over 25 years.
We help homeowners across:
- Leicester
- Oadby
- Wigston
- Hinckley
- Loughborough
- And the wider Leicestershire area
Our experienced team can advise you on the best material, style and glazing option for your property, with a free, no-obligation quote.
Call us on 0116 456 0242 or request a quote online today.
Related Guides:
- How Much Does a uPVC Window Cost in Leicestershire?
- Cost of Double Glazed Sash Windows
- Aluminium vs uPVC Windows: Which is Better?
Frequently Asked Questions
Are sash windows more expensive than normal windows?
Yes. Sash windows are generally more expensive than standard casement windows due to their traditional design and mechanical components.
Yes, in many cases they can be upgraded or replaced with modern double glazed units. Professional assessment is recommended, particularly for listed buildings.
Timber sash windows typically cost £1,500 or more per window, depending on size and finish.
They are more expensive than standard uPVC casement windows, but the long-term energy savings, improved comfort, and added property value often justify the investment.
