Trade Advice Archives - Dempsey Dyer
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UPVC, aluminium and timber manufacturers

Operating since 1977

Full range of Deceuninck, Reynaers and Accoya systems

Manufactured in the UK

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Timber Bifold Doors or Aluminium?

Since modern housing design began back in the late 1960s, homeowners have always been looking for a way to connect the outside of their properties to the inside. Whether that be with a balcony that overlooks a busy city street or a garden that is home to plenty of social gatherings over the summer months. Whatever it may be the homeowner has on the outside, having a large opening out back really helps with providing the illusion of more space within the home and giving the home lots of airflow. The sliding door was previously the best choice, and for many people, that still is the case. The sliding door takes up very little extra space when it’s open and gives the household wonderful views of the outside when it is closed. 

However, for those with the space, the modern bifold door has started to take the market by storm as the preferred option. Whilst the bifold door may not provide the completely clear view that the sliding door does when it is closed, the sheer breadth of the opening is unmatched. Essentially acting like opening the entire wall, the bifold door is just superb as a modern innovation. 

Here at Dempsey Dyer, we provide modern bifold doors in both aluminium and timber variants, each with its own unique benefits and stylistic appeal. Both are excellent choices, but it depends on what the homeowner is after when choosing between them.

What is a Bifold Door

In truth, the folding door has been a part of homes since ancient times. Their first recorded use seems to date back to the ancient Romans in various building types and applications. The concertina design (as it is otherwise known) gives the building a difficult entranceway that can take up a lot of space and provide a large opening, likely perfect for merchants and the like. 

The bifold door fell out of fashion somewhat over the centuries until very recently, when the double glazed concertina door came back into style. Before this innovation, bifold doors acted as folding walls of a sort, but their lack of structural integrity compared with an actual wall left a lot to be desired. However, when compared to a window, the structure is not massively affected, especially with a back door into the garden. 

Bifold doors operate on a rail system on the top and bottom with hinges between each panel. The door has one ‘master door’ at the end on either side or in the middle that can open independently of the others. The rest can then be folded into starting from the master door across the length of the installation. If the master door is in the middle, then the door opens both ways towards the edges.

The design has recently taken the British home design market by storm due to its modern finish and superior ability to provide the illusion of space over the sliding door. Here at Dempsey Dyer, we provide bi-fold doors to trade customers and homeowners in timber or aluminium. 


The timber bifold door combines contemporary design with traditional materials. With the advent of modern resin and varnishing, timber no longer degrades in the weather in the same way that it used to. There was a time when purchasing a new timber installation came with a caveat of constant maintenance to keep it from rotting in the humid British weather. Luckily this is no longer the case. You can enjoy the thermal insulating properties of timber as a material with no concern of degradation or deterioration over the years!

We provide three timber species for our bifold doors:

  • Accoya
  • Sapele
  • European Oak

Accoya is the high-performance species that we provide and is made from sustainably sourced softwood. With class 1 durability, you’ll struggle to find better on the market for longevity alone.

Sapele is a common hardwood used for both windows and bifold doors with a class 3 durability classification qualifying it as moderately durable. Don’t let the term fool you, though. This wood species is still able to achieve many years of service in the home.

Our final option is the European Oak that we source through an FSC (Forest Stewardship Council). European Oak has a class 2 durability classification and is excellent for the homeowner looking for an authentic and sustainable bifold door. 


Aluminium bifold doors are likely the reason that the bifold door has really taken off in the last ten years. With slim frames, occupants can enjoy exceptional views of the garden whilst also having the option of opening up the door and potentially providing an opening as large as the wall. 

Our aluminium doors are able to circumnavigate the issues that once came with aluminium thermal efficiency. We use modern thermal break technology to stop aluminium elements from coming into contact with each other. In doing this, we prevent global cooling of the whole installation and affect your home’s thermal efficiency. With aluminium bifold doors, you can enjoy modern levels of comfort with modern design styles too.

If you’re interested in a bifold door from Dempsey Dyer, whether you be a trade or homeowner, we provide quick quotes right here on our website with our online pricing tool! You can also contact us directly through our contact form with any specific questions you may have.

The Variety of Timber Casement Windows from Dempsey Dyer

Over the years, the casement window has become the standard window fixture, particularly in the last 20 years since uPVC took over the market. uPVC entered the market due to the lack of longevity that timber provided to homes back in the 1970s through to the 1990s. However, since the early 2000s, modern design innovations and technologies have allowed resins to be developed that allow for timber installations to make a return to modern UK homes without having to worry about rotting, warping or discolouration. As such, here at Dempsey Dyer, we have developed a range of timber casement windows that provide the home with the best in thermal efficiency, security and weather protection. uPVC still remains an excellent option for homeowners, but timber has finally made its full comeback to wonderful effect. 

Today we wanted to focus on the three variants of our timber casement windows that we provide to trade installers and to homeowners: Flush Sash, Mock Sash and Stormproof Casement. Each window has something slightly different to offer the UK home. All of them have excellent properties in retaining warmth in the home, providing exceptional and modern levels of security and protection from weather damage. 

Flush Sash

Our timber flush sash windows have the professional touch that homeowners of heritage properties are looking for. Since uPVC entered the market, we have seen modern homes built with uPVC double glazing and homes built in the 1970s and later having their single glazed windows upgraded to uPVC. However, there has been a spot missing for the heritage home that has no interest in providing the home with modern uPVC finishes. Fortunately, modern timber casement windows have arrived to fill this gap in the market! 

Flush sash windows are stylish and discreet due to their flush design against the wall. They provide the traditional home with a modern upgrade that holds true to their classical style. They also provide the modern home with a touch of grace that may be missing if they had their uPVC windows installed sometime ago!

All of our timber casement windows provide homes with exceptional thermal efficiency. In these modern times when energy prices are skyrocketing with no sign of slowing down, it has never been more important to ensure that the energy we are using is used to its best effect so that we’re not wasting our money on leaking heat! 

Mock Sash

The mock sash timber casement window provides the same visual effect as the flush sash casement window but uses modern opening and closing methods. From the outside, you wouldn’t know that this window actually opens and closes like a modern casement window as it looks identical to traditional timber sash styles. However, the homeowner can enjoy modern window design from the inside. If you’re looking to give your home the contemporary upgrade without sacrificing on the outward appearance of the home, then look no further than the mock sash timber casement window! 

Like with all of our timber casement windows, the mock sash provides exceptional safety using our top of the line high security locking system. With a modern timber casement window from Dempsey Dyer, you can ensure that your home is protected from potential intruders. It used to be that timber windows were inadequate security measures to the ease with which intruders could break through them after they had rotted or degraded through the weather over several years. However, due to the modern application of resins, we can assure you that your timber casement window will not degrade through the weather at all! 

Stormproof Casement

Our stormproof timber casement range provides the home with the absolute best in weather protection. These windows come in a vast range of styles, including the two mentioned previously, so that you can customise your windows to your exact specifications. Whether you’re looking to provide the home with a traditional sash style or something more modern, our stormproof timber casement windows will give your home all the weather protection it needs without any signs of degradation.

Modern Timber Casement Windows from Dempsey Dyer

Our timber casement windows are available for trade customers and homeowners alike. Whether your client is looking for that modern upgrade to their heritage home or you yourself are looking to give your home a touch of the classics, then you’ll find what you need with Dempsey Dyer. All of our windows provide the best in thermal efficiency, security and weather protection, and all are customisable with a variety of timber species so that you can get the exact effect with the exact colour you’re looking for.

If you’re interested, please use our free online quoting engine today to get a quick price for your project! You can also contact us directly if you have any questions or call us on 01977 649641!

The Different Front Doors

Modern homeowners have never had more choice of materials and styles for their installations than they have today. Especially with the advent of modern technology in manufacturing, homeowners can now receive exceptional quality across the board no matter the material or style they choose. As a result, it is important as an installer that you are aware of the differences between the various products we sell here at Dempsey Dyer. If a customer asks, it is good to be well informed and aware of what each type of door provides for the home in contrast to the others. Homeowners will not be as well informed as you on the variety of doors they can choose from, so they’ll trust you to provide them with a thought out recommendation. Today, we wanted to break down the different doors that we provide so that you can be fully informed about the products that we sell.

Timber Doors

Timber doors have come a long way in the centuries they’ve been used across the UK. Long gone are the days of weather degradation and rotting front doors. Nowadays, modern coatings and manufacturing processes have provided timber front doors with the ability to withstand weeks of poor weather conditions without showing any sign of the degradation we might have come to expect some years ago. We use three different species of wood for our timber front doors. The Accoya range is a high performance, modified timber made from sustainably sourced softwood. It has ‘Class 1’ durability, which is the highest level of durability for timber. Our Accoya products are premium when it comes to timber installations. We also provide European Oak products, which would be one tier down. European Oak has a ‘Class 2’ durability rating and has the lightest colour of the three species we provide. We source this particular species through the Forest Stewardship Council to ensure that we are sourcing this species sustainably. Finally, the next tier down is the Sapele range, which has the darkest colour of the three species and has a ‘Class 3’ durability classification, making it moderately durable. This species comes from West Africa and Cameroon and is an attractive choice regardless of having the lowest durability rating. Timber doors are perfect for the homeowner who is looking to add a nostalgic and timeless look to the front of their home. Authenticity is a key selling point and an excellent reason for customers to purchase timber products.

uPVC Doors

Next up is our range of uPVC front doors. uPVC is one of the three most widely used synthetic materials on the planet because of its relatively low production cost and its exceptionally high durability, low maintenance and thermal efficiency. uPVC is also wonderfully customisable and can easily be given a woodgrain finish to look like a timber door. uPVC doors are perfect for the homeowner looking to make an affordable addition to their home that still provides excellent performance across the board. uPVC front doors are able to last anywhere between 20-30 years and will provide consistent protection from the outdoors throughout that entire life span. uPVC requires very little maintenance to remain in tip-top condition so your customers can rest easy with a ‘fit and forget’ front door. 

Aluminium Doors

Aluminium front doors provide the home with a truly modern entranceway that is particularly on-trend at the moment in home design circuits. Critall like design made to replicate the industrial art-deco look has shown an explosion in the demand for aluminium and aluminium looking products. Homeowners looking to give their home something new that makes a statement to passersby and visitors alike will absolutely love an aluminium front door. Aluminium also no longer has the issues of thermal efficiency that it once did. With the use of modern thermal break technology, the aluminium elements of the door are separated from each other so that heat does not pass easily from the inside to the outside. As a result, the aluminium door is just as thermally efficient as a modern timber door or a uPVC one. 

Composite Doors

Finally, we also provide composite doors, a completely modern innovation that combines many of the materials mentioned earlier into one outstanding product. We provide two types of composite doors. The first is the foam-filled variant. Foam-filled composite doors are the less strong of the two types, the other being the timber core variant. However, foam-filled composite doors are known to be more thermally efficient than the timber core.

On the other hand, Timber core is much stronger and able to withstand a lot more punishment. As a result, it is really up to the customer which element they would like to prioritise over the other. Composite doors are just as customisable as uPVC, meaning that they can be given a woodgrain finish should the customer wish it. 

So there you have it, our quick guide to the kinds of front doors we provide here at Dempsey Dyer! Our front doors all come with customisable hardware that is all of the highest quality. If you’re interested in any of the front door products for your customers, why not get a quote from us today with our easy to use online pricing tool? Furthermore, if you have any specific questions for us, please feel free to contact us using our online contact form or call us on 01977 649641.

We look forward to hearing from you!

uPVC Windows vs Aluminium Windows – Which is best for your customers?

Unplasticised Polyvinyl Chloride, otherwise known as uPVC, is a low maintenance alternative building material that can substitute for timber or aluminium. uPVC has become a popular choice for homeowners looking for effective thermal insulation and noise reduction and is considered a more cost-effective alternative to more traditional materials due to its lower initial price point. The material is made from vinyl polymer bound to chlorine atoms and boasts very high strength. uPVC is among the top three most popular (by usage) synthesised plastics in production worldwide!

Aluminium is a traditional, high-price point material for windows and doors. Aluminium has often been considered the best material for windows because of its longevity, durability, and providing a distinctive, high-quality look to a building. However, it has been criticised over the years for its poorer thermal performance compared to other materials, although this can be circumvented with modern innovations. As uPVC begins to take over as the most popular material on the market, is it time to say that uPVC is now the more attractive option. Or is aluminium still the ultimate choice?

Durability and Installation

uPVC windows are exceptionally durable for the low price point at installation. Highly resistant to wind and rain, uPVC is an incredibly strong material, proved by its popularity across many industries. Due to its composition, uPVC will not rust or rot and is resistant to chemical erosion. The overall low maintenance of uPVC is an incredibly important part of why they are so attractive to homeowners. The composition is designed to be a ‘fit and forget’ installation that does not require any special coating to ward off dirt, dust and bacteria.

On the other hand, aluminium has a much longer lifespan than the uPVC at around 45 years! Therefore, the higher price point of aluminium windows is reflected in them is a long-term investment for homeowners looking to increase the value of their homes. However, the low price point of uPVC means it could be a much more cost-effective solution for the modern homeowner.

Both uPVC and aluminium are lightweight materials that are easily manipulated. As a result, installation is considered an easy process with both materials. In terms of production, aluminium requires large amounts of energy for the binding process in creating the alloy. Therefore, whilst the installation process can be relatively simple, aluminium production is complex. uPVC, on the other hand, is very easily produced and sourced. As it is among the top three synthetic plastics, a consistent supply of uPVC is available for installations, which is reflected in its low price point.

Heat Insulation

Aluminium as a material has taken steps to become a better heat insulator. Through a thermal break, aluminium elements of the installation are separated to prevent global cooling of the whole installation. The material itself has been called a poor insulator, and homeowners may have cold window sills in the winter. However, the modern innovation of thermal breaks ensures that aluminium is a high-performance thermal insulator. uPVC, on the other hand, is an exceptional heat insulator. The material does not conduct heat, preventing temperature shifts over the year. Therefore, whilst also being a cheaper alternative to aluminium, the energy efficiency of uPVC is relatively the same, if not better. Homeowners can be sold on much lower energy costs over the course of the year due to not needing to regulate the temperatures of their homes with fans or heating with both uPVC and aluminium windows.

Aluminium has a sleeker and higher quality ‘look’ to it. Traditionally, aluminium has been considered the premium material when it comes to windows. The lower price point of uPVC, however, coupled with its various benefits, is extremely significant for potential customers compared to aluminium. When coupled with the potential for lower energy costs is similarly significant to potential customers, particularly as prices for a lot of materials and energy are currently going up.

Which is best?

There is no definitive answer when it comes to deciding which is better. Aluminium is more expensive but has a much longer life span and provides an ultra-modern aesthetic to the home, potentially raising its value. On the other hand, uPVC has a lower life span but is an exceptional thermal insulator requiring low maintenance with a much lower price point. 

Here at Dempsey Dyer, we offer both aluminium and uPVC windows in various styles and colours. Using our online quoting engine, you can design the window that you need in the material you desire to receive a free quote today! Furthermore, don’t hesitate to contact us with any specific questions or join our free newsletter to receive updates on everything happening here at Dempsey Dyer.

Is Double Glazing Sustainable?

Is double glazing sustainable? At Dempsey Dyer, we’ve been helping businesses and companies across the UK realise how much double glazing can help them. Double glazing makes windows, doors and even conservatories more durable, efficient and comfortable for your customers. As a result, it’s a dramatic improvement for most homes and commercial buildings.

However, is it a sustainable one? With energy bills rising more than ever and the climate situation feeling more precipitous, now is the time to make sustainable decisions for your company. Fortunately, modern double glazing is already paving the way for homes and businesses to become more eco friendly. Today, you can now offer uPVC, aluminium and timber windows and doors that are recyclable, sustainably sourced, and efficient enough to reduce energy usage.

With Dempsey Dyer, you can invest in double glazing that is sustainable for your business. We make sure our full range of double glazing products won’t harm the environment, and they can help your customers make savings for their homes as well. Because of this, anybody looking to make their home more sustainable will look to you. And, with us as your trade supplier, you can get fast turnaround times and the capability of custom orders to help you provide the answers.

Is Double Glazing Efficient?

One of the main questions about double glazing is how efficient it is. With Dempsey Dyer, you can invest in windows and doors for your business that can dramatically improve the insulation of homes and commercial buildings. Our designs can come with uPVC, aluminium or timber profiles, which are resilient, durable and air and water-tight. Because of this, there will be no room at all for cold air to get through, helping your customers keep warm throughout the year.

Double glazing uses two panes of glass, as well, providing more insulation. The two panes of glass can trap heat inside while keeping cold air outside, meaning energy escapes less as well. As a result, double glazing can improve the effectiveness of the energy your customers will use, meaning they’ll be able to stay warm while relying less on their central heating. Because of this, they’ll reduce their energy bills and their carbon footprint, and they’ll have your company to thank.

Is Double Glazing Sustainable Long-Term?

Double glazing is also a long-term, sustainable investment for your customers. When they choose one of our windows and doors through your business, they’ll be able to get a design that will stand the test of time. Our double glazing products are highly durable, and they’re fully weatherproof to make sure the profiles won’t crack, twist or warp out of shape. As a result, some of our windows and doors can perform for decades to come, and they don’t need regular maintenance.

Even when they wear down, our double glazing remains sustainable. It’s because Dempsey Dyer’s range of windows and doors is all fully recyclable, and it’s sustainably sourced as well. Because of this, none of the products you order from us will ever end up in a landfill, giving your eco-conscious customers peace of mind. And, for your business, you can reduce your carbon footprint by needing to order fewer windows and doors and choosing sustainable options for your company.

Double Glazing with Sustainable Materials


We only install double glazing that has sustainable materials in its design. Because of this, we’ve made sure that uPVC is a key part of our range. uPVC windows and doors are more versatile than old steel or timber designs, as the material is fully weatherproof and can perform capably in even the worst conditions. Not only that, uPVC windows and doors are more thermally efficient than those old designs, helping your customers save on energy bills and decrease their carbon footprint.


Aluminium double glazing is just as sustainable as our uPVC double glazing range. With aluminium profiles, the double glazing you can offer to your customers will be strong and resilient, making it more secure and able to last longer. Your customers won’t have to maintain aluminium windows and doors regularly, and they can still last for nearly half a century. The profiles won’t warp, crack or even discolour, meaning they won’t need replacing or repairs to reduce the materials used and emissions created.


At Dempsey Dyer, we can also supply engineered timber double glazing to your business that is sustainable. It’s because we use Accoya wood across our range, a specialised timber product that is manufactured sustainably. We put the wood through a process that strengthens it and makes it more resistant to wind and rain, but the process produces no harmful toxins. And, because our timber windows and doors are fully recyclable, you can let your customers know it will never end up in a landfill.

Double Glazing at Sustainable Trade Prices

With Dempsey Dyer, you can invest in sustainable double glazing at sustainable prices for your business. To find out more about adding our products to your range, get in touch with our friendly team using our online contact form. Alternatively, start your trade quote today to start your journey with us as your trade supplier.


Installers and other businesses can only work effectively if they have a reliable trade supply service – offering the highest performing products. Luckily, here at Dempsey Dyer we only supply the latest options from market leaders. This guarantees quality, performance and durability – regardless of the product choice.

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