Double Glazed Sash Windows
We are Sash Windows London, a family-run window company. We provide all our customers with a friendly and reliable approach to customer service, helping you find the perfect windows for your home.

The Benefits of Double-Glazed Sash Windows

The benefits of having double glazed windows in your home is huge both thermally and acoustically.
Around 25% of the heat loss in an average property is through the windows and doors, so by simply having new windows and doors fitted you can dramatically improve the energy efficiency and EPC rating of your property.
At SWL our mission is to create high performing windows which replicate the profiles Traditionally used across London properties.
All of our windows exceed current building regulations with a range of solutions offering U Values as low as 1.2W/m2K.

Our Range of Double Glazed Sash Windows

UPVC Double Glazed Sash Windows
Here at Sash Windows London, we are passionate about making our products available to everyone. That’s why we work hard to provide affordable sash window materials, like UPVC.
Our double glazed UPVC sash windows are made to mimic the look, style, and quality of timber as much as possible. Our UPVC windows are some of our most affordable products and provide quality, durability, and security for all our customers – making them a popular choice. If you would like to discuss UPVC double glazed sash windows price, please do not hesitate to get in touch with our team today.

Double Glazed Timber Sash Windows
If you want authentic and high-quality double glazed timber sash windows, you’ve come to the right place. Timber has been used as a building material for hundreds of years. It is well-known for its functionality, pleasing aesthetics, and durability.
The timber sash windows we sell and install are all double glazed, long-lasting, and energy efficient. What’s more, we protect all our timber sash windows from rot, decay, and weathering. Our wooden sash windows are definitely for you! If you would like to find out our double glazed timber sash windows cost, please do not hesitate to get in touch with our team today. We would be more than happy to answer any questions you may have!

Double Glazed Box Sash Windows
Box sash windows are a beautiful addition to any property. The box sash windows we sell and install at Sash Windows London are specifically designed to ensure they mimic the traditional sash window as closely as possible. Choose from traditional double glazed timber sash windows or double glazed UPVC sash widows, the choice is yours. At Sash Windows London, we cater to your requirements. So, if you’re looking for box sash windows double glazed, contact us today.

How Double Glazing Works
Our glazing units are built to the highest standards using the best quality products.
The most efficient type of glass for double glazing is low emissivity (Low-E) glass. Low-E glass contains a special coating of metal oxide which is invisible and lets in light, but is excellent at preventing heat from escaping. This is used in conjunction with spacing between each pane of glass which can be filled with different types of gas. The gas is used for replacing dehydrated air in the gaps and has a much lower thermal conductivity than air. There are different types of gas such as argon, xenon or krypton, and argon in particular has a 34% lower thermal conductivity, so is extremely effective when it comes to preventing heat loss.
The pane spacers themselves, which are used to separate the glass are warm edge spacers and contain very little metal. We’ve found these to be the most energy efficient and can really maximise the amount of heat kept inside your property.
Protecting Your Property’s Heritage
Our heritage range is perfect for classical buildings and modern homes seeking a vintage look.
When installing double-glazed sash windows for listed buildings, we will work to install a window that fits seamlessly with your property’s design. If you live in a heritage property, we provide double-glazed sash windows in grade 2 listed buildings and other period properties. We know that maintaining the look and style of your home is extremely important, and that’s why we work hard to provide windows that complement your property’s heritage.
We are the window company for you if you want a double-glazed sash window conservation area.
At Sash Windows London, we share your passion for preserving the original heritage of your home. Whether your property is a heritage building, located in a conservation area, or boasts traditional detailing, we are dedicated to finding the perfect windows that uphold its unique
character.
10-year warranty on upvc windows
10-year warranty on glazing
5-year warranty on ironmongery & seals
Double Glazed Sash Window Costs
The cost of double-glazed sash windows can vary depending on the materials, size and quantity. For example, wooden double glazed sash windows may be more expensive than uPVC or aluminium. Here at Sash Windows London we constantly strive to keep our prices at a minimum, so give us a call today to discuss your requirements.
Our double glazed UPVC sash windows cost depends on the size and number of windows you want to have installed. This is the same for timber materials and the style of window you are opting for. If you would like to discuss window cost, please do not hesitate to get in contact with us today. We would be more than happy to discuss your requirements.

Order Stunning Double Glazed Sash Windows
We offer a stunning range of bespoke double glazed sash windows.
Get vintage looks and modern energy performance, saving you money on heating bills and keeping you warm through the winter.
Explore our brochure to learn more about our fantastic range and service, or speak to a member of our team about your needs to get started.
