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Full range of Deceuninck UPVC systems

Manufactured & tested in the UK

Premium colours available for great aesthetics

Quality build & finish

A timber door with highly secure locking system
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Range of timber species including Accoya

Intelligent design that prevents rot & warping

Stylish, protective translucent & opaque finishes

Perfect for conservation areas

Timber effect window with mechanical joint
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UPVC windows that look like timber

Robust mechanical joint developed internally

Choice of Fab & Fix hardware or 'From the Anvil' ironmongery

High quality woodgrain foil finish for great aesthetics

Quality windows and doors for the trade

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Since 1977, Dempsey Dyer have been offering a trade supply service of high quality windows and doors. We make it our aim to offer a comprehensive product range, all under one roof. With this as our priority, our trade supply service is one that you can rely on to help save time, money and hassle – and one that will therefore enhance your business.

Over the years, many businesses and individuals have chosen Dempsey Dyer for their trade supply service of windows and doors. Many of our customers return to us time and time again – and this is no coincidence. It is thanks to the quality of our products and the efficiency of our service. This combination makes us the trade supplier of choice for a range of different fenestration, installation and home improvement businesses – in many locations across the UK. We guarantee that your business could be the next one to benefit too!


II Windows

Here at Dempsey Dyer we have uPVC, timber and timber effect windows available via our reliable trade supply service. Benefit from the latest uPVC designs from Deceuninck, various timber species including Accoya and our in-house developed Beaumont timber look range.

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White Framed Window

II Doors

Dempsey Dyer’s trade supply of doors enables you to meet a host of specifications. Entrance, bi-fold, patio and French styles are all available with various configurations, ensuring you can offer highly bespoke solutions to your clients.

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Grey Entrance Door

II Conservatories

Choose from our in-house manufactured timber frames, or a range of conservatory systems from third part market leaders. Either choice use the same high performance ironmongery that is incorporated into our supply of windows and doors.

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Glass Conservatory Roof

II Orangeries

Offer your residential customers an inspirational living space with our range of uPVC and timber orangery solutions. Each can be designed to bespoke requirements and combines large glazed openings with solid brick pillars.

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Modern White Orangery


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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Become an Inspire installer

Inspire your customers with the Inspire range from Dempsey Dyer with a dedicated retail website.

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Download Centre

If you want to know more about our products, processes and accreditations, fortunately we offer a range of downloads. Download a range of literature free of charge, to refer to in your own time.

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The latest news from Dempsey Dyer

Dempsey Dyer strengthens door range with Invisifol...

Yorkshire’s Dempsey Dyer has added to its extensive offering with the innovative Invisifold slide and swing door. Renowned for its versatility, the Invisifold system converts a conventional patio or French door into a highly-flexible, sliding and folding solution, allowing homeowners to create large openings to outside spaces. The Invisifold system is quite unique, as every sash can be operated independently to create partial walkways and provide ventilation anywhere along the opening. “Whilst we are well-respected in the industry for our timber expertise, we are incredibly passionate ...

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BSI overhaul for one of Britain’s most accredite...

Dempsey Dyer, one of the UK’s most accredited, quality conscious fabricators, has adopted BSI standards across the board after a period of using several different schemes. The firm is now able to supply products that meet BS644 for enhanced security timber windows and doors, BS7412 for enhanced security uPVC windows and doors, and BS 8529 for enhanced security composite doors. Dempsey Dyer continues to comply with ISO 901:2008, which covers the manufacture of uPVC windows, doors and conservatories, and is registered with the British Fenestration Rating Council. “We’ve taken this deci...

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Dempsey Dyer takes Heritage Flush Sash to the next...

In late 2016 Yorkshire fabricator, Dempsey Dyer launched the Deceuninck Heritage Flush Sash window available with welded transoms, mullions and frames. The company is now delighted to offer the same window fully mechanically jointed. The Heritage Flush Sash is a uPVC sash window that balances modern performance with traditional design, boasting A+-rated thermal efficiency and PAS24-compliant security alongside excellent weather performance. By developing this product with convincing timber-style mechanical joints, Dempsey Dyer demonstrates their industry-renowned expertise in both uPVC and tra...

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Dempsey Dyer doors more durable thanks to Ultion l...

Respected Yorkshire fabricator Dempsey Dyer has strengthened its industry-leading door portfolio with the adoption of the much-celebrated Ultion lock. Achieving Secured by Design, BSi and Solid Secure Diamond status, the Ultion lock is one of the most highly accredited lock systems ever manufactured. The moment that it detects forced entry, the Ultion activates a specialised attack lock housed directly in the system’s central cam. Even if the intruder manages to get past its two sacrificial sections, they can’t get to the safety lock as it is embedded in molybdenum, a metal alloy 25% dense...

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