Double Glazed Windows: Improve Comfort & Energy Efficiency
At Eco Sash & Case, our double glazed windows service blends expert craftsmanship with modern energy efficiency. When you upgrade your windows to double glazing we will retain your original window frame and only replace the glass which will be fitted with your chosen double glazing option.
This approach allows you to maintain the authentic charm of your period property while enjoying the benefits of improved thermal performance, enhanced comfort, and greater energy efficiency.
Traditional Appearance, Advanced Double Glazing Technology
A typical double glazed sash and case window upgrade involves:
- Remove original window glass
- Replace any rotten timber and restore original sash casement
- Install slim argon gas filled double glazing
- 5-Coat Heritage Protection Paint System
- Replace external pointing with traditional sand mastic
- New sash ropes and pulley wheels
- Energy-efficient draught proofing
- Brighton sash locks and ironmongery
Benefits Of Double Glazed Windows
Increased Comfort
Stable indoor temperature year-round.
Lower Energy Bills
Cut your energy bills with year-round efficiency.
Noise reduction
Blocks out external noise for a quieter home.
Increased Property Value
A desirable upgrade for modern buyers.
Enhanced Security
Tougher glass for better protection.
Eco-Friendly Choice
Lower carbon footprint with less energy use.
Double Glazing Options:
4/4/4 Double Glazing (12mm)
This double glazing option features two 4mm glass panes separated by a 4mm argon gas cavity and a black warm-edge spacer.
4/6/4 Double Glazing (14mm)
If you are looking for greater comfort and energy efficiency. Choose our 4/6/4 double glazed unit, which features a 6mm argon gas cavity between two 4mm glass panes and a black warm-edge spacer.
4/8/4 Double Glazing (16mm)
For optimal energy efficiency, choose our 4/8/4 double glazed unit, featuring an 8mm argon gas cavity between two 4mm panes and a black warm-edge spacer.
Acoustic Glass
Experience superior sound reduction and thermal performance with acoustic glass. Featuring a 6.8mm acoustic laminate outer pane, a 4mm argon-filled cavity, and a 4mm glass inner pane.
Fineo Glass
Fineo glass is an advanced vacuum-insulated glass system, consisting of two glass panes separated by a vacuum. This vacuum acts as a highly effective insulating barrier, reducing heat loss and minimizing noise.
Book your free, no-obligation Eco Windows Survey.
Brochures and Listed Building Advice For Double Glazing
If you own a listed building, you will need to obtain listed building consent. You can download more information on obtaining planning permissions and listed building advice, or contact our office staff for step‐by‐step guidance on the process.
At Eco Sash & Case, we’ve been working on listed buildings for many years so are perfectly placed to provide you with advice.
Improve Your Home’s Efficiency with Double Glazed Windows
By installing double glazing you are guaranteed to notice a dramatic reduction in heat loss. Double glazing is know to eliminate draughts and improves your home’s insulation. As a result, your home stays warmer during the winter and becomes more energy efficient throughout the year—leading to lower heating bills overall.
Why Choose 'Eco' Sash & Case
We are proud to be one of the first companies in Scotland to offer a more sustainable and eco-friendly sash window repair and installation service.
What makes us different is the materials we use from paints, fillers, and wood, to draught proofing, and the energy-efficient double and secondary glazing. Our services are designed to restore your windows to add many more years to their lives, maintenance-free.
Window Warranty
We are proud to stand by the quality and durability of our work, which is why we offer a comprehensive guarantee on all glass installations and timber components. This ensures your investment is protected while reflecting our confidence in the craftsmanship and materials we use. With these guarantees in place, you can feel fully supported and reassured when choosing Eco Sash & Case.
Double Glazed Windows FAQs
Can my existing sash windows be upgraded to double glazing?
In most cases if your original windows are fitted with single glazing, a new sash will be required. This is because the existing single-glazed sash typically doesn’t have enough depth to accommodate a double-glazed unit. However, we will keep the original window casing.
Will upgrading to double-glazed sash windows improve energy efficiency?
Yes, double glazing will significantly reduce heat loss, helping to lower energy bills and maintain a more consistent indoor temperature, especially in older properties.
Do I need planning permission to install double-glazed sash windows?
How long does the upgrade process take?
The installation of your new double-glazed sash’s typically require one day for each window. However, this will be dependent on the work required on the refurbishment of the casement.
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The Future of Windows Is Sustainable
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Benefits of Energy-Efficient Windows
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Why Homeowners Choose Eco Sash & Case
At Eco Sash & Case, we’re proud to be recognised as one of the best window companies in Edinburgh, trusted by homeowners across the Lothians and Fife. Whether we’re restoring a listed Georgian townhouse or upgrading a Victorian flat with double glazing, our mission remains the same: to combine expert
How we offset our carbon footprint
Planting Scots Pine Trees
We’ll plant a Scots pine through Trees for Life for every completed sash window project over £5000.
Trees for Life is an award-winning Scottish charity working to restore Scotland’s Caledonian Forest.
