Double Glazed Sash Windows in London

We offer wooden sash window restoration, sash window installation, double glazing, maintenance, refurbishment and replace old sash windows.

Arthur East

Arthur is a hardworking and dedicated Glazing specialist, with over 10 years trades experience


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What is a double-glazed sash window?


Double glazed sash windows are made using two panes of glass. A heat-insulating filler material is sandwiched between the glass panes, which reduces the transfer of energy from one side to another. A double glazed sash window is the most traditional and popular type of window in the UK – specifically the type that we at Trade Timber Windows and Doors stock. Double glazing sash windows have two wooden frames called sashes, all of which slide up and down on their own individual hinge within a single frame.

How do double glazing sash windows work?


Double glazing sash windows work by having two sets of glass panes, which are generally separated by an insulating material such as argon gas or krypton gas. The first pane can be opened and moved within the window frame to provide ventilation. The second pane remains closed and in position unless opened for cleaning. Double glazing sash windows are similar to traditional sash windows in that they have two sashes which fit into notches cut into the frame at the top and bottom.

Sashes are made from a myriad of materials: hardwood, softwood, engineered wood, PVCu, timber lookalike etc – with a natural finish or painted to any colour you desire. Inside the frame is wooden or metal mullions which hold the glass in place. At Trade Timber Windows and Doors , we know that the design of original wooden sash windows can be improved upon.

Our windows involve a lot more than just glazing. We have been improving the quality of old sash windows for over 10 years and are based in London. We can replace and repair your old windows with energy-efficient double glazed ones along with maximising the aesthetic appeal by adding to the timber and maintaining its natural beauty.

What makes our double glazed sash windows unique?


Authentic period design

Our authentic period design double glazed sash windows make the building stand out and are available in a choice of colours to match your building’s original features and paintwork. Besides being strong, durable and beautiful, our sash windows carry no conservation restrictions. Our authentic period design double glazed sash windows are much slimmer than most double glazing and are fitted outside the window opening.

Smooth running mechanisms

The smooth-running mechanisms of Ace double glazing windows will ensure that you can open and close your window whenever you require. Our sash window’s smooth-running mechanism, timber framework and standard size frame make it a great choice for any project. A traditional favourite with a modern twist, this window does not compromise on the quality of traditional wooden windows whilst ensuring your home is draught-proof, thermally insulated and UV protected.

Enhanced draught-proofing technology

Our double glazing sash windows are equipped with technology that is best in the business when it comes to draught-proofing. Draught proofing is never on people’s minds until the pitter-patter begins. Then they start searching for help. Be a step ahead by choosing our double glazed sash windows equipped with enhanced draught-proofing technology.

Current Building Regulation Compliant

With so many homeowners unaware of the existing regulations for sash windows, they have to spend thousands on new windows in order to comply with current regulations. Fortunately, with Trade Timber Windows and Doors, there is a better way. Our double glazed sash windows are fully compliant with the latest Building Regulations, helping homeowners keep their initial costs low while meeting all of today’s requirements.

Get in touch with us today on 020 452 51669 or for quality double glazing windows that stand out.

Improved thermal efficiency

Wouldn’t you like to lower your energy bills? Reducing the amount of heat lost from your home could help you save on heating bills. If you’re looking for a means of improving the thermal efficiency in your home, then you may want to consider replacing your sash windows. Our replacement sash windows will enable you to not only reduce your energy bills but also give you and your family a healthier indoor environment to live in.

Our Guarantee

  • Unrivalled Expertise in Door & Window Glazing
  • Industry-approved Door & Window Glazing
  • High-quality Door & Window Glazing
  • Unbeatable Value for Money
  • 100% Safety and Satisfaction
  • Checkatrade Registered
  • Homepro Insured
  • CERTAS Guarantee

What are the types of double glazed sash windows we offer?


Double Glazed Timber Sash Windows

Timber is luxurious, timeless, and always aesthetically pleasing. Our double glazed timber sash windows offer many benefits; providing an authentic traditional style and superior acoustic performance; as well as being cost-effective and easy to install. Contact us today on 020 452 51669 and find out how you can enjoy all of these benefits with double glazed timber sash windows that fully comply with building regulations.

UPVC Double Glazed Sash Windows

We make certain that your house reflects your identity, which is why we bring you an assortment of eco-friendly and stunning uPVC double glazing sash windows, from traditional single-glazed sash to contemporary sliding windows for the kitchen. We make certain that your house reflects your identity, which is why we bring you an assortment of eco-friendly and stunning uPVC double glazing sash windows, from traditional single-glazed sash to contemporary sliding windows for the kitchen.

Double Glazed Box Sash Windows

Are you looking for double glazed box sash windows in London? We have a wide range of window types and designs and even more materials to help you create the perfect look. With our double glazed box sash windows, all you have to do is sit back and enjoy. If you’re thinking about what box sash window is ideal for your home, we are here to help!

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To find out more about our services, get free quotations, or arrange an appointment, call this number 020 452 51669.

What are the features of Ace double glazed sash windows?

  • Easy Glide Vertical Track
  • Laminated Glass
  • Improved Security Locking
  • Storm-Proof Frames
  • Choice of Colours
  • Option for Tilt and Turn Sashes
  • Patterned Glass
  • Low- e Glass
  • Warm edge spacer bars
  • Plant-on sash horns

What are the benefits of Ace double glazed sash windows?


Highly Energy efficient – A-rated

Ace double Glazed Sash Windows provide an A-rated Level of Heat Loss and therefore form part of a Carbon Reduction Strategy. Our sash windows can help to increase your home’s energy efficiency. It is a great option for homeowners that want to reduce their energy bills during the summer and winter months.

Lower heating bills

Save money on your heating bills with our double glazing sash windows. The energy efficiency of modern glass helps lower the temperature of your home, even in very cold weather. Our double glazed sashes will help you save on heating bills by keeping out heat loss.

Enhanced security that meets BM Trada Q-Mark

Security is as important in a family house as it is in a commercial building, that’s why at Trade Timber Windows and Doors, we offer a far superior level of security than a standard sash window. Our double glazed sash windows are fitted with multi-point locking bars to all sashes and an anti-lift bar to the lower section of each left-hand window. They have a readily accessible latch mechanism that ensures that you get out in case of fire fast. They are also far more secure against burglary compared to timber panes.

Less carbon footprint

Are you thinking about ways to combat global warming? Installing double-glazed sash windows is one of the easiest and most effective measures you can take. Ace Double Glazed Sash Windows makes for a smaller carbon footprint.

Reduced condensation on the glass

Our double glazed sash windows are more efficient than traditional single glazed designs because they significantly reduce the amount of moisture that condenses on the glass. This means you’re far less likely to experience damp problems such as mould and rotting, particularly if you live in a particularly cold area.

Airborne noise, dust, and other pollutants are reduced

Improve the appearance of buildings with our quality double glazing windows which are able to protect from dirt, moisture, frost, and relieve pressure on wall timbers. The acoustic performance of double glazing reduces outside noise by 12 dB. You can concentrate on work, enjoy the sounds of nature, or simply relax easier in your own home. This can also reduce the need for air conditioning and ventilation systems.


Double glazed sash windows styles we install


Edwardian Double Glazed Sash Windows

Our Edwardian Double Glazed Sash Windows are a traditional favourite, with their decorative frames and elegant detail. The uPVC glazing on our Edwardian Double Glazed Sash Windows has been specifically designed to be draught-proof. A combination of sophisticated detailing and high-quality uPVC glazing makes these Edwardian Double Glazed Sash Windows an excellent choice for your home.

Victorian Double Glazed Sash Windows

Our Victorian style double glazed sash windows will create an elegant, traditional look. They come in classic styles with contemporary benefits. The quality and performance of our double glazing are perfectly matched to the traditional beauty of your home.

Georgian Double Glazed Sash Windows

Our Georgian Double Glazed Sash Windows are designed for both traditional and contemporary homes. The classic profile of the Georgian Collection is complemented by a range of subtle details that add maximum design flexibility. Your windows can be customised with a selection of apertures to suit your style and space while also offering UV protection to help prevent fading.

Why choose Ace double glazed sash windows?


Flexible finance

We’ll help you find the right finance solution for your needs, so you can get double glazing on the right terms. For full terms see our website or call us on 020 452 51669 for more information.

Quality guaranteed

Our windows are crafted with precision and pride. We only use the finest materials to make your home sparkle with double glazed and high-quality wood (grade A softwood) or UPVC. Trade Timber Windows and Doors London offer high-quality services across the whole of the United Kingdom. We provide traditional sash windows to the highest possible standards using only top quality British made materials.

Warranties and guarantees

We offer a 10-year guarantee against defects on all of our installations. Feel free to contact us if you would like more information.

Professional installers

Trade Timber Windows and Doors London have a team of experienced installers based in London who will install or repair your windows to the very high standards expected of our products. Our company can adapt to any property and ensure we give an efficient service throughout the installation of your replacement sash windows. We offer a broad range of high-quality sash windows across London, so please do not hesitate to get in touch for any queries you may have. Our professional glazing team is experienced, which means that when you choose us for your double glazing, we’ll be up to the task and exceed your expectations. Guaranteed.

Price-match promise

We have a long-term business relationship with wholesalers that enables us to supply your double glazed sash windows at the lowest possible prices. We never compromise on quality and take extra care of your double glazed sash windows from storage to transportation and delivery. We are not happy with our services unless you are satisfied with them.

Double glazed sash windows colour options


  • White
  • Anthracite Grey
  • Cream
  • Black Brown
  • Golden Oak
  • Rosewood
  • Chartwell Green
  • Agate Grey
  • Irish Oak
  • English Oak
  • Nut tree
  • Anthracite smooth grey

Bespoke Double Glazed Sash Windows


We have double glazed sash windows custom-manufactured to fit the style of your home. This elegant window is crafted from high-quality materials available in a choice of colours and finishes, offering unbeatable value for money.Visit us at LOCATIONXX UK to see our range of sash double glazed windows or visit our gallery on our website to see our exciting range of double glazed sash window options to make your perfect choice today!


Frequently Asked Questions

What kind of energy efficiency can I expect from my double glazed sash windows?

Double glazed sash windows will help you reduce the amount of heat lost through your windows. An increase in temperature difference between the inside and outside of a building leads to increased air infiltration, draughts, and condensation. With double glazing, this effect will be significantly reduced, resulting in improved thermal performance.

What about planning permission? Will I be allowed to install double glazed sash windows?

As double glazed sash windows are often installed on the interior of a house, they are generally not subject to planning permission in the UK.

Can timber sash windows be double-glazed?

Yes, timber sash windows can be double glazed. In fact, most of the timber sash windows we install are fitted with double glazing.

Can I add double glazing to my original sash windows?

You can add any type of double glazing to your existing sash windows, whether it’s timber or UPVC. The installation process will differ slightly between the two. If you need this service, please feel free to contact us directly for a consultation.



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