Double Glazed Sash Windows
If you’re in the market for new sash windows, you’ve come to the right place. Sliding Sash windows are a classic and elegant choice for any home, and they can add a touch of traditional charm to any room. Whether you’re looking for a modern twist on this timeless design or you want to stick to the traditional style, there are plenty of options to choose from. From materials to colours to hardware, you can customise your sash windows to perfectly fit your home’s aesthetic. Plus, with their energy-efficient design, sash windows can help you save on your energy bills while still enjoying plenty of natural light. So if you’re considering sash windows for your home, be sure to explore all the options available to find the perfect fit for your home.
At Colin’s Sash Windows, we are committed to help you with the best suitable windows to give your house a new look. Our original double glazed windows are manufactured in the UK, supplied nationwide and exported worldwide. Unlike many suppliers, we always give the best price possible to all customers first time – homeowners or trade.
Designed to replicate old timber sash windows whilst incorporating the benefits of uPVC. Our sash windows operate like box sash windows – both the top and bottom sashes slide up and down as standard, and most of them tilt inwards for easy cleaning. They are also double glazed, A energy rated. All our sliding sash windows are made to measure and delivered to your property ‘ready to fit’. Since they come with a 10-years warranty, you don’t have to worry about your investment.
Why Choose uPVC Sash Windows?
Sash windows are a timeless and elegant choice for any home. Their classic design adds charm and character, while their functionality allows for easy ventilation and cleaning. With their traditional look and modern features, our sash windows are a perfect blend of designs and practicality for any homeowner.
Since 2014 we’ve become the market leaders for uPVC Sliding Sash Windows! You won’t be disappointed by our competitive prices. Check our measuring guide, get your sizes and ask for your sash windows online quote!
Tradition With Technology
Our sliding sash windows are manufactured using the SPECTUS uPVC profile designed to truly emulate traditional heritage frames. Featuring woolpile strips that provide an excellent seal against weather, air and debris infiltration. ‘Low E’ glass together with a warm edge spacer bar provide exceptional heat retention, and a superior ‘A’ energy rating. Our innovative dedicated weather bar add another level of defense against rainwater – an extra feature unique to this type of window. Designed with not only elegance and authenticity in mind, but security too. The sliding double glazed sash windows are multi-chambered and reinforced to prevent deflection through different climates. Our vertical sliding sash windows ensure that your home retains its character and charm. You can choose from a wide range of styles (including the vertical sash windows style) features and hardware options to complement your home.
- Custom made
- Low maintenance – no sanding or painting
- Easy clean facility
- Safe and secure
- Weather resistant
- Energy efficiency – A rated
- Authentic woodgrain effect available
- 10-year guarantee
- Multiple Glass Options
- Made in UK, delivered nationwide
How to order? Check our blog here.
Design & Order Your Bespoke Sash Windows Online
Create made-to-measure sliding sash windows for your home using our easy online designer. Choose your preferred frame colour, glazing, hardware finish and practical window accessories before placing your custom order with Colin’s Sash Windows.
White uPVC
UPVC SASH WINDOWS COST – SUPPLY ONLY FROM £270 + VAT
- Double glazed – argon gas filled, Low E glass
- White furniture
- ‘A’ energy rated, 1.4 U-Value
- Warm edge spacer bars
- No sash horns
- Trickle vents
- Toughened glass on the bottom sash
- 150mm stub cill
- Fast UK delivery from 3 weeks
- Small delivery charge applicable for orders less than 4 windows or if you are based in Ireland
Woodgrain uPVC
Add any of the below features for more authentic heritage look:
Standard Woodgrain Collection
White- Anthracite Grey
- Cream
Dual Foils Collection
- Agate Grey / Heritage White
- Anthracite Grey / Heritage White
Special Woodgrain Collection
- Chartwell Green
- Agate Grey
- Irish Oak
- Black Brown
- Golden Oak
- Rosewood
- Non Bars
- Three Light
- Three Offset Light
- 2/5 x 3/5
- Asymmetric
- Margin
- Half Georgian
- Georgian
- Georgian Variant
- Fire Egress A
- 1/3 x 2/3
- Swept Head
- True Arch
Spectus uPVC Profile
| Frame Depth | 128mm |
| Corner Detail | Welded |
| Meeting Rail | 50mm |
| Run-through Sash Horns | Optional Extra |
| Woodgrain | Optional Extra |
| Seamless Welds | Optional Extra |
| Deep Bottom Rail | Optional Extra |
| 20mm Astragal Bar/s | Optional Extra |
Integral blinds for your sash windows
We’re pleased to offer our sash windows with built in blinds. The double glazing has venetian blinds in between the 2 panes of glass with a magnetic slider control on the left or right side to move them up and down and open/close. They’re available in white, silver and cream colours. Integral blinds are more expensive than traditional blinds, but they offer several advantages. They have no unsightly cords to get tangled and require no cleaning. With our climate becoming hotter and sunnier, they are perfect for deflecting sunlight during the hottest part of the day. Integral blinds cost around £440 per sash window, which includes one blind in the top sash and one in the bottom. We offer a bigger range of colours for our normal uPVC windows including blackout blinds which are very popular in children’s bedroom windows and cinema rooms. Please take a look at our Integral Blinds page for more information.
Glazing Options for uPVC Sash Windows
Standard Double Glazing
Advanced 24mm double glazing is standard on our sash windows. This system has two glass panes separated by an argon-filled spacer. This setup reduces heat transfer, keeping your home warmer in winter and cooler in summer. Windows have 4mm clear glass on the outside and 4mm Low E glass on the inside to improve thermal efficiency and lower energy expenses.
Laminated Glass
This solution uses two 3mm glass panes bonded with a special noise-reducing interlayer, improving sound insulation and strength. Even if the glass breaks, the interlayer holds the pieces together, keeping your property safe.
Obscure Glass
We offer obscure glass for sash windows that adds flair and utility. We offer patterns ranging from minimal to extreme hiding. This lets you customise privacy and light diffusion.
Spacer Bars
Warm edge spacer bars around the glass panes keep our double-glazed units structurally sound. These bars maintain pane spacing and improve window longevity and efficiency. We offer three treatments to match your window colour.
Bark
Level 5
Contour
Level 3
Leaf
Level 3
Stain
Level 5
Stipple
Level 4
Westminster
Level 2
See Our Catalogue
- Sage Green uPVC Sliding Sash Windows
- Grey Upvc Sliding Sash Windows
- Black Upvc Sliding Sash Windows
- Golden Oak uPVC Sliding Sash Windows
- Green uPVC Sliding Sash Windows
- Cream uPVC Sliding Sash Windows
- Rosewood Upvc Sliding Sash Windows
- Light Grey uPVC Sliding Sash Windows
- Agate Grey Upvc Sliding Sash Windows
- All Products
Features of Our uPVC Sash Windows
Click below, or on a highlighted feature on the window, to learn more
Corner Joints
Run-through Sash Horns
Tilt Knobs
Astragal Bars
Slim Midrail
Sash Lock and Keep
Trickle Vent
Deep Bottom Rail
Weatherbar
Slide & Tilt Facility
Integrated Cill
Corner Joints
Standard Miter Welds
Our standard welding process guarantees tight, durable corner connections, resulting in a smooth, robust frame. The 45° corner welds are meticulously cleaned with advanced machinery, ensuring a polished finish.
Timber-Style Mechanical Joints
Our mechanical joints offer a higher level of authenticity by replacing the standard 45° uPVC welds with 90° mechanical joints. This technique mirrors the craftsmanship found in traditional timber windows, enhancing both style and durability.
Run-through Sash Horns
Eliminating the lip on the sash horn edge allows for a more refined design, enabling the integration of a woodgrain foiled end cap that blends smoothly with the horn’s shape. Instead of being welded, the sash horn features mechanical joints, ensuring it remains a continuous component of the sash for a more authentic appearance. This updated horn design is only available when a slim midrail is included. On windows with a standard midrail, the run-through horn will have a slightly different appearance.
Tilt Knobs
The tilt knobs are designed to open and tilt the sashes, making it easier to clean the outside frame and glass from inside your home. These knobs come in two styles, which you can explore in the hardware section for available finishes and options.
Astragal Bars
Add a bar layout to your new made to measure windows for extra character. Astragal bars are applied to the surface of the glass, while back-to-back spacer bars are placed inside the double-glazed unit to create the look of individual panes.
Slim Midrail
The design elements of our sliding sash upvc windows are now more historically inspired than ever. The new 37mm slim midrail strengthens the Legacy’s reputation as one of the most authentic sash windows available, making it perfect for period properties or homes in conservation areas. Please note, the slim midrail is only available with run-through sash horns and on windows with a minimum width of 436mm. Certain colour options may be limited; please inquire for details.
Sash Lock and Keep
Our locking system secures the sash window by fastening the mid-rails together. It is available in two styles, with various finishes. For more options, please refer to the hardware section.
Trickle Vent
We provide two vent solutions that comply with Document F of the building regulations. Both options are colour-matched to complement the design of our Legacy sash windows. The modular vent offers 2000EA per module, while the Link Vent is available in two sizes: 2500EA and 5000EA.
Deep Bottom Rail
Opt for a deep bottom rail if you want your box sash windows to closely resemble the original timber sash style. The fully mechanical deep bottom rail closely mimics the bottom sash of Victorian-era timber windows and pairs beautifully with run-through sash horns.
Weatherbar
The modern sash window offers an optional ovolo-shaped weather bar, a recent addition to our heritage design features, crafted to enhance the authentic appearance of the sash window.
Slide & Tilt Facility
Both the top and bottom sashes can be moved up and down for ventilation. Our Legacy sash windows include an easy-clean tilt feature, allowing you to clean the exterior of the windows from inside your home. Please note, for windows with a woodgrain finish on the exterior and a smooth finish on the interior, the top sash tilt feature is not available.
Integrated Cill
The integrated cill on upvc sliding windows combines visual appeal with practical benefits. It smoothly blends with the bottom section of the window, enhancing its look while protecting against moisture damage by directing water away from the frame. We offer two sizes: 150mm for windows installed on an existing cill, and 210mm for installations where a projecting cill is needed.
UPVC Sash Window Hardware Options
When it comes to UPVC sash windows, the quality and functionality of the hardware play a crucial role in ensuring smooth operation and lasting performance. Our range of hardware components is designed to enhance the usability, security, and maintenance of your sash windows.
Here’s an overview of the key hardware elements:
Lift Hooks
The lift hooks, fitted on the inside of the bottom sash, enhance convenience and reliability for daily use. They ensure a smooth and consistent opening experience for both residential and commercial properties.
Pole Eyes
For high-positioned windows, the pole eye is a crucial accessory. Located on the underside of the top sash, it enables operation with a pole and hook (not supplied), allowing easy access to hard-to-reach windows without extra tools.
Locking Systems
Our UPVC sash windows feature a robust locking system that secures the window by locking the middle sections together. We offer two lock styles, both enhancing security and ensuring a snug, safe fit to protect your home from unauthorized access.
Tilt Mechanism
Cleaning your windows is easy with the tilt mechanism, which allows you to tilt the sashes inward for easy access to the outer frame and glass. This feature lets you clean from inside without ladders or special tools, simplifying maintenance.
Travel Restrictors
To improve safety, our UPVC sash windows feature travel restrictors that limit the opening to 100mm, reducing the risk of accidents and keeping the window securely in place.
D handle
This sash window handle is designed to be attached to the bottom sash on the window’s exterior, enhancing functionality and ease of operation
SASH KNOB
You can use these to open and tilt the sashes, so you can clean the outside frame and glass from inside your home.
Mid-Rail Locking System
Our sash window locking system securely fastens the mid-rails together, ensuring the window remains shut. We offer this system in two different styles.
Hardware Colour
Explore our range of hardware colours. Our window restrictors and safety locks are highly recommended for their ideal balance of safety, security, and ventilation. They facilitate air circulation while reducing the risks associated with fully opening windows, making them a practical choice for various living environments.
Our hardware is available in eight different finishes.
Please note that our travel restrictors are only available in white, chrome, gold, and satin chrome.
Antique Black
Black
Bronze
Chrome
Gold
Graphite
Satin Chrome
White
FAQ’s
Can I Replace Timber Windows with uPVC Sash Windows in a Conservation Area?
How Much Do uPVC Sash Windows Cost?
Are uPVC Sash Windows Energy Efficient?
Can I Install Sash Windows in Any Property?
How are uPVC Sash Windows Installed?
Are uPVC Sash Windows Secure?
How Do Sash Windows Work?
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Can they be painted?
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