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Leading UPVC and timber manufacturers

Operating since 1977

Range of Deceuninck, Alunet and Accoya systems

Manufactured in the UK

An introduction to Dempsey Dyer

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Why Should You Choose a Flush Sash Window?

At Dempsey Dyer, we manufacture flush sash windows for end users. Flush sash windows come with a beautiful finish that is accepted in conservation areas. But what other benefits can you offer your customers? Read on to learn more.

Flush Sash Windows Are Customisable

Flush sash windows come in a wide range of styles, colours, and finishes. Our windows come in woodgrain finishes which are suitable for anyone who wants a natural look.

Our flush sash windows come in a range of powder-coated colours that can help withstand the worst weather conditions. With airtight and watertight seals, inform your customers that these windows can help prevent mould and draught spots.

A Timeless Aesthetic

Flush sash windows offer a timeless aesthetic that any homeowner will be proud of. Our flush sash windows are characterised by their unique design where the window sits flush in the frame. The design is reminiscent of timber joinery, resulting in a window that gives any home the wow factor.

As a result, their design compliments period properties, but if your customer is living in a modern property, they could feel equally at home thanks to the slim sightlines on offer. What’s more, this gives clear views,

Thermally Efficient

Our stunning sliding sash windows are crafted to modern standards, offering outstanding levels of thermal efficiency. The double glazing is designed to keep natural heat inside while cold air is left outside, which helps save on bothersome energy bills. What’s more, the tight weather seals will protect you from unpredictable weather conditions.

What’s more, inform your customers that the sliding sash windows are soundproof as well, which is ideal if they live in a loud neighbourhood or near a busy motorway.

Slim Sightlines Offer Outstanding Kerb Appeal

With frames that require the same width, inform your customers that our flush sash window gives outstanding kerb appeal. If your customer lives in a modern or traditional home, a saah window is suitable for your needs.

Outstanding Security

Our flush sash windows are perfect for customers who are conscious about security. Our modern sash windows offer outstanding double glazing, which helps ward off intruders easily, giving better safety over time.

But that’s not all. Our sash windows have built in multi point locking systems and firm handles. This could ensure that forced entry attempts could be easily repelled.

Get A Flush Sash Window Installed Today

If you want to learn more about our flush sash windows, get in touch with the friendly team at Dempsey Dyer. We have extensive knowledge on our products, so we are on hand to help you.

Speak to Dempsey Dyer today by filling out our online contact form. We will answer any questions you may have.

Timber Windows & Doors – Engineered for Energy Efficiency

At Dempsey Dyer, we supply wooden windows and doors for the trade. With winter coming up, it is essential that the windows give you outstanding energy efficiency for your home as it will be warmer in the winter. A unique selling point, this will save money on energy bills, which is imperative in a cost of living crisis.

We know how important it is to improve thermal efficiency, so in this article we will explain how thermally efficient wooden windows and doors will make homes warmer. Furthermore, the article will compare the thermal efficiency of wooden windows to aluminium and uPVC windows. To learn more, read on.

Timber Windows Offer More Energy Efficiency Than uPVC Windows

In comparison to uPVC windows, modern treated timber lasts longer because it keeps your home at a warm temperature. Combined with advanced double glazing, it offers a robust thermal barrier that boosts your natural heat intake. The base substrate of the window is naturally warm to the touch, preventing condensation build up. For homeowners who are concerned about their heating and cooling bills, this is an ideal design to suit their needs.

When choosing wood as a natural insulator, this minimises the effect on energy bills. Around 80% of energy you use on your home goes towards heating. By choosing a wooden window or door, this saves costs significantly.

Accoya Wood Offers a Stronger and Long Lasting Look

At Dempsey Dyer, we use Accoya wood to manufacturer timber doors. This is an eco friendly choice that uses a patented technology that stands firm against tough conditions. This process also removes water from the existing wood, allowing it to stay strong for many years to come. The design is Class 1, offering the highest level of durability and sustainability.

Accoya wood is available for a variety of styles such as Casement and Flush Sash Windows. Obtained from naturally renewable sources, the design is suitable for traditional properties. Accoya is a natural wood that ensures it weathers naturally. It is more stable in comparison to uPVC, which degrades over time. Accoya only uses timber from sustainable forests, which offer many benefits to the environment. In comparison to other materials, timber is a renewable source. This means it can always be replenished.

Timber Windows Contain Polymer Weather Seals

Timber windows offer  better heat retention. polymer seals, vinyl perimeter seals, and rubber capillary seals protect against draughts and cold spots. This is ideal if you are choosing a tilt and turn window, as it is connected to the grooves so cold air won’t be able to enter.

Save Money on the Long Run by Upgrading from Double Glazing to Triple Glazing

One option to improve your wooden windows energy efficiency is to upgrade from double glazing to triple glazing. This will add an extra layer of protection and warmth. Triple glazing ensures your home is up to 40% more energy efficient. With exceptionally low U values, homeowners can expect to save over ÂŁ160 on their bills, making it easy for them to spend on the things that matter.

Check the Locks to Ensure the Windows Are Sealed

It is important to check that the windows are sealed, as they will keep warm air in your home. If gaps are left in the windows, cold air will enter easily. Furthermore, timber windows can also be made warmer by repairing the frames individually. As a result, save plenty f money on costly repairs!

Prevent Warping on Your Timber Door

Timber doors are prone to warping easily. Warping is when a door twists and contorts in toughened conditions, and is caused by the door twisting in toughened conditions.

It is essential to take care of the door properly by preventing it from warping and regularly checking it so it doesn’t absorb water. Choosing a strong finish is ideal because it prevents moisture from entering the door. As a result, homeowners won’t need to worry about mould and draught spots.

Secure the Glazing Properly

Double glazing is a great way of increasing your thermal efficiency. However, having the glazing properly secured and in good condition. This way, natural heat will be retained indoors, lasting for a long time.

For extremely cold conditions, adding wood framed glass to the door will help buffer the weather and prevent any further damage.

Timber Windows & Doors from Dempsey Dyer

We hope that this article has helped you understand how timber windows will keep your home energy efficient. Timber windows offer plenty of protection against tough conditions, alongside draught seals which stop water ingress from entering your home.

If you have any questions about our timber windows, our team will be on hand to help you. Contact us on 01977 653002 and we will answer any questions you may have.

How To Look After Timber Windows?

At Dempsey Dyer, we supply and install a variety of timber windows for the trade.  When we supply wooden windows for the trade, it is imperative to keep them clean. You can ensure that it will last for many years to come. Timber windows stand out from the competition because they look fantastic.

Location is an essential thing to consider when you are installing wooden windows for your customer. If the window is facing south, this will benefit from more natural light, however they will be more vulnerable to the harsher elements. As a result, this results in more maintenance.

Let your customer know that there are methods they can use to look after their windows. In this article, we will go through some of these methods, so you get a clearer view. Read on to learn more.

Remove Dust From the Window

The first thing your customer should do when cleaning the window is to look out for extra dust on the top layer. This will remove the first layer of dust, saving a lot of issues in the long term.

Furthermore, you will need to keep an eye out for cracked spots and mildew, as this makes your home look unsightly in the long term. This could expose cracks in the paint that expose natural wood, being a heaven for all kinds of insects. It s imperative to treat these areas straight away.

Wash the Frame and Glass

Let your customer know that they should wash the timber windows thoroughly to get rid of mould and damp spots. This can be treated through a damp cloth or soapy water, ensuring that it will look in pristine condition. Ensure that the water is replaced when it gets dirty, and then give it a few strokes with a cloth to remove the residue.

Cleaning the glass is also easy because all you need to do is wipe it with a microfibre cloth and a combination of vinegar and water, and then it will gain a streak free shine. Another simple option your customer can use is washing up liquid with water to create a mixture, then use fresh water to rinse it off.  Wood is not immune to warping, but with this treatment, it will last for a long time.

Treating the Wood

Treating the wood is an essential component for your aluminium windows because you will want to make sure that it looks in pristine condition. If the area is rough, use sandpaper to smooth the edges alongside a putty knife. Then, leave it overnight to dry, and then trap moisture that decays the window.

If your customer is wondering how to protect their window, inform them that they will need a semi transparant strain that guards against sun and moisture. This results in a natural look that blends in with the wood and your customers’ property. To do this, apply one thick paint of coat, wait for it to dry for a couple of hours, and then apply the second paint coat.

Recoating the Paint

It is important to apply paint to the wood once a year which will help it look its best for longer. To recoat the paint, wipe it down with silicone abrasive paper to remove grease and dirt, then allow it to dry. Next, apply a microporous finish carefully without using it on the weather seals. This will cause damage and render them ineffective. Leave to dry for a couple of hours and it will look pristine.

 Dealing With Scratches and Chips

If the timber in your home is damaged, it is an idea to repaint it immediately, which will help keep it together. It can be susceptible to damage and chips easily, so the first thing to do is use a light abrasive to  lessen some of the damage, then remove it with a damp cloth.

Then, a timber filler should be used to make the surface smoother, giving you space to reapply the damaged area straight away. Wood is also susceptible to knots and grains, which rot over time. This can cause the wood to expand, so inform your customer that it is important to treat the wood regularly to maintain it.


We hope that this article has helped you understand how to look after your timber windows. Relaying these points to your customer will give them a better idea of keeping them pristine. Additionally, point your customer in the direction of  our online quoting engine. Here, they can design a wooden window that suits their needs.

If you want to learn more about our windows, get in touch with us today. Give us a call on 01977 649641 and we will answer any questions you might have.



Window & Door Colour Trends

Create a stunning first impression for any customer’s home with a new window and door installation. Simply changing a window and door profile changes the way a home looks and performs.

Although brightly coloured front doors or bold window frames are not new, colour technology has come a long way since the limited range of shades previously offered to homeowners. Because we manufacture many of our products and work with leaders in the industry, we offer bespoke colours and styles to our customers. This helps reflect your unique style.

We’re proud to offer a wide range of windows, doors and conservatories created bespoke for your specifications. Whether you’re looking for timber, uPVC or composite, our products lead the way in aesthetics and performance.


White windows and doors

White windows and doors are timeless and will never go out of style. They are one of the most popular choices in your local area because they are cost-effective and won’t become dated.

White is versatile and can suit almost every style of home. They can match any colour interior design and curtains, delivering a clean look every time. Avoid combining white windows with white render because they will likely weather at different rates. We recommend pairing white windows with cream and off-greys.


Cream windows and doors

Although white windows and doors are popular, the cream is a softer version that feels less clinical. Some people feel like white lacks personality, whereas ivory or cream maintains that clean aesthetic with a more heritage finish.

Cream uPVC windows and doors are a fantastic option for most UK homeowners, as they can fit well into most house styles and even add to the kerb appeal of a property.


Grey for windows and doors

For many modern interior designers grey is the new black when it comes to windows and doors. Grey windows and doors break away from traditional white, black or brown to set a property apart. Grey will allow customers to enjoy a modern twist on a traditional profile.

Grey is a complementary colour to raw stone or reclaimed building materials. Grey profiles will also seamlessly blend into more subtle and bolder colour-coordinated designs. We offer Anthracite Grey, which is a dark grey hue named after the coal it resembles.


Black windows and doors

If your customers enjoy a more contemporary and minimalistic style, black doors and windows can elevate the look of a building. Black profiles will create a dramatic statement that suits all home styles in your area.

Black windows can accentuate the external views, as the light that floods into them wash out the darker profile. They don’t need curtains to look good, perfect if your customer has a minimalist interior design.

If your customers are interested in a darker profile but are concerned about having pitch-black profiles,  choose darker shades like grey, plum and navy blue.


Natural wood effect windows and doors

Our windows and doors are available in stunning woodgrain finishes. These finishes mimic the look of traditional timber only have none of the durability issues. If you are looking for a low maintenance replacement for a wooden door, our woodgrain foil uPVC profiles won’t rot, warp or split over time and with wear.

Your customers will enjoy a window or door which mimics the look and texture of timber, with all the performance benefits of modern uPVC. Black and grey windows and doors are low maintenance because their darker shade will hide grime and dirt, making them look cleaner for longer.

If you are looking for a deep and rich tone, Rosewood is an extremely popular shade and looks good when paired with classic red brick architecture. Light oak is a more neutral wood tone that is more versatile.


Green windows and doors

Green hues like Sage Green and Chartwell Green are elegant choices when installing windows and doors. This traditional tone has been popular for styles and is often found in country homes.

Chartwell green is a more pastel tone that particularly works well as a front door colour. It is often paired with sophisticated silver or gold door handles and hardware to create a stunning first impression.



We hope that this article has helped you choose which colour is the best for your window and door installation project. Whether you are working on a modern apartment, a traditional cottage or a heritage home we will have the right tone for you.

If you want to find out more about our windows and doors, please get in touch with our friendly team and we will be on hand to help you. Fill out our online contact form or call us on 01977649641 and we will give you advice bespoke to your home improvement project.


How Timber Windows Are Affected By Weather Conditions



At Dempsey Dyer, we install plenty of timber windows for your customer. One of the main benefits of our timber windows is that they are extremely thermally efficient, meaning they will keep warm air inside your property.

With the summer upon us, it is important to understand how timber windows are affected in hot climates. This article will explain everything you need to know. In addition to this, the article will help you understand how your customers’ timber windows can be protected from excessive damage.

How Does Timber Contract Heat?

Once timber reacts to heat, it expands and gets bigger, which is called thermal expansion. Whereas timber from the past would have discoloured and warped easier, our modern variations are built to resist any heat or weatherproof effect. Our wood, made from Accoya, is built to resist this easily as wood is a stronger material than it’s given credit for. In comparison, steel and aluminium aren’t as good at withstanding heat. This helps the windows take the temperature in their stride.

If your customer has some wooden windows, the windows will retain moisture, especially in unpredictable weather conditions. In some cases, this affects how the wood performs because if it is exposed to too much water, this causes it to shrink and get damaged easily. This means that wood expands because of changes in humidity.

If the weather is hot, the pores of the wood will expand, causing them to release water.  This shows that wood will be able to contract heat easier.

How Does Sunlight Affect Wooden Windows?

It is important to understand how wooden windows are affected by the sunlight. If you are looking to prevent sunlight from coming into the window, use blinds or colourful curtains. This will give your customers home privacy and stop the glare from the sunlight, which can discolour and damage furniture.

What’s more, humidity and moisture are some of the main culprits that damage wooden windows, so it is ideal to store them in a cool and dry place to stop it from warping. One of the main things you should do is to check If the area around the wood is dry and ensure that the window is sealed and maintained. That way, the window won’t crack, warp, or fade, lasting a long time.

Cold Weather Has An Impact on Timber Windows

At Dempsey Dyer, we understand that timber windows are prone to moisture from cold weather. This is because timber is sensitive to moisture as the wood warps in wet conditions. Inform your customer that it is essential for wood to be kept out of wet weather. However, over drying should be avoided because this will result in cracks and splits.

Insulate the Window With Double Glazing

Double glazing is beneficial to your home as it will make sure it is thermally efficient, so heat can be retained. As a result of this, the cold air won’t be able to enter your building easily, which cuts out energy bills significantly. Inform your customer that upgrading their windows to double glazing will result in an immediate impact on how they save money.

Seal Around the Windows With Caulk

Inform your customer that caulking their wooden windows this will act as a moisturiser to seal the windows from warping. It is important to choose a caulk that is flexible and doesn’t harden in winter.

Sealing the gaps will do two things. First of all, it stops water from entering your property, saving money on repairs. Secondly, the window will stay warmer, so your customer will save money on their energy bills. It is important to inspect the windows regularly in case more caulk needs to be applied.

Regularly Inspect Moisture From the Windows

Inform your customer that mould is a common problem, especially with wood. As a result, inspecting moisture frequently is vital so it doesn’t become an issue. All it needs is a combination of soapy water and a damp cloth, then the mould will be removed. Then, the windows will look as good as new.


We hope that this article has helped you understand how timber windows get affected in tough conditions, and how to look after and maintain them. It is important because that way, they will last for many years to come.

If you want to find out more about our timber windows, get in touch with our friendly team and we will be on hand to help you. Fill out our online contact form or call us on 01977649641 and we will give you tailored advice bespoke to you.






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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