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Flush Sash Casement

Our timber flush sash casement windows are manufactured with a professional finish, making them suited to conservation projects – including the renovation of grade II listed buildings. The authenticity of flush sash wooden windows appeals to all homeowners, combined with their performance.
  • Traditional butt hinges and casement stays available
  • Security guarantee on products fitted with MACO locks
  • Range of cill, frame thickness, finish and ironmongery options
  • Choice of timber sashes and wood species
  • Highly resistant against corrosion
  • Endurance and salt spray tested
  • Full dry gasket glazing system

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Bespoke timber conservatory
Timber french doors available from Dempsey Dyer
White timber flush sash windows
Timber flush sash casement window
Flush sash window with translucent finish
Timber flush sash window supplied to installer
Traditional flush sash window for traditional property

Unique Specification

Our timber flush sash casement windows are manufactured with a professional finish, making them suited to conservation projects – including the renovation of grade II listed buildings. The authenticity and performance of flush casement timber windows appeals to all homeowners.

The aesthetics of traditional flush sash casement timber windows are highly sought-after for homeowners with traditional properties, as well as those looking to bring renewed charm and elegance to their more modern home. Wooden windows grant this stylish appearance with ease.

Our timber flush sash casement windows have been designed with a range of innovative design features, resulting in a combination of traditional aesthetics and modern technology. Flush sash casement timber windows are also complete with a fuss-free finish and replicate original 19th Century wooden windows.

Designed with Durability in Mind

  • Designed and manufactured in house allowing us to match your requirements
  • Traditional butt hinges, casement stays and astragal bars available
  • Choice of timber sashes and wood species
  • Full dry gasket glazed with sloped or concealed drainage system
  • Espagnolette locking systems featuring mushroom bolts and shootbolts
  • Locking systems achieve more than 7.4Kn (double requirements of BS7950)
  • Locking mechanism tested to 40,000 operations & salt spray tested for 500 hours
  • Choose from traditional or contemporary Fab & Fix hardware, Croft hardware or ‘From the Anvil’ ironmongery

Timber Species

Entice end users with options for timber species

Whichever species of timber you and your clients prefer for your wooden windows, we use only the most innovative materials – and those that offer style and function. For superior timber windows, you can rely on us.

Accoya flush sash casement timber windows species


Accoya is a high performance, modified timber made from sustainably sourced softwood. Its durability is labelled as ‘Class 1’, the highest level of durability for timber windows and other home improvements. This species is suitable for both windows and doors.
Read more about Accoya

Sapele flush sash casement wooden window species


Suitable for both wooden windows and doors, Sapele is a common hardwood sourced from West Africa and the Cameroon, Sapele achieves a ‘Class 3’ durability classification, making it ‘moderately durable’.

European Oak flush sash casement timber windows species

European Oak

European Oak features an attractive grain and we source this through an FSC (Forest Stewardship Council) This species has a ‘Class 2’ durability classification and is suitable for both timber windows and doors.

European redwood timber flush sash casement windows species

European Redwood

Sourced as engineered laminated stock to improve durability, this species is a cost-effective option for stylish new timber windows. We’re proud to work hard to make our wooden windows accessible

Sash Styles

Meet conservation requirements with four sash options

Not only do we offer one of the broadest timber product ranges in the industry, we also provide aesthetic choices in terms of sash design. With four unique and innovative sash options, clients are able to meet specifications and choose a design that also meets their personal needs.

They all are based around the traditional timber design of ‘putty-line’ external and ‘ovolo’ internal mouldings. This ensures that you can pass on flexibility with our timber casement supply.

To further replicate the appearance of traditional timber windows, we can fit astragal bars and leaded glass. We can match the leaded design to an existing pattern or provide a range of classic options such as the diamond style.

Mayfield flush sash timber windows

Mayfield: 24mm IGU

Mayfield’s modern design is available with or without astragal bars, and in conjunction with the astragal bar option an interbar creates the appearance of single glazing.

casement wooden window prices

Amberley: 20mm IGU

The moulding on Amberley is based on traditional timber putty-line external and internal moulding details. This style is available with or without astragal bars.

Petworth timber casement windows

Petworth: 16mm IGU

As energy efficient as a 24mm unit, Petworth is a double glazed sash which gives the appearance of single glazing within your wooden sash window.

Ebernoe flush sash wooden window profiles

Ebernoe: 4-10mm Single Glazed

Ebernoe is ideal for conservation areas where maintaining original timber flush sash window aesthetics is extremely important as it uses traditional putty glazing techniques.


Coloured wooden windows and doors Chartwell green colour timber flush sash casement windows conservatoryPreserve and protect with colour

Our flush sash casement timber windows and our wide range of stunning products are available in a range of translucent and opaque finishes. We offer most colour options but we have our own standard colour range, so you can customise your wooden window to meet your customers’ needs. Colours may appear slightly different on the various species of wood so we would recommend requesting a sample.

Translucent finishes preserve the natural beauty of your timber windows while opaque resembles the traditional colouring of the past. This is the ideal home improvement to bring highly desirable aesthetics to any property with the addition of our finely crafted flush sash wooden windows.

With opaque finishes, all RAL colours are available, giving an almost unlimited choice when it comes to personalising or matching to existing windows. You can heavily customise your desired timber window design to meet your needs.

Our paint system also protects the wood from harmful ultra-violet rays and from water ingress thanks to its microporous structure, which allows excess moisture to escape. Our paint is also flexible meaning it can expand and contract naturally with the timber. Our wooden window styles are high performance yet low maintenance for a superior product.


Thermal performance diagramEfficient and Effective Glazing

All of our flush sash casement timber windows come with high performance glazing that effectively prevents heat from leaving but also allows in a comfortable amount of natural light.

That way, when you invest in our wooden casement window styles, you won’t have to compromise on appearance over performance.

With a range of efficient glazing options, an existing pattern can be matched. Our timber window profiles can also be an attractive way to maintain privacy. With varying degrees of obscurity, natural light can still enter the room.


Traditional hardware

Our wide choice of hardware from the Anvil traditional ironmongery and Fab & Fix range allows you and the end user to achieve a completely custom look when refining the style of your flush sash casement timber windows. From PAS24 espagnolettes to shootbolts, all our locks offer security as well as style.

Design by Durability

flush casement timber windows manufacturing flush sash timber windows supplyProfessional design and finishing process

To ensure you’re getting the best products, including our high performance wooden flush sash windows, our timber range of windows and doors are designed with sustainability and durability in mind. We have full control from start to finish to create beautiful timber products every time. The materials we use in our wooden windows offer exceptional performance due to a minimum 7” slope which ensures water runs off easily. Any moisture easily drains out due to the ventilation and drainage beads present in all bottom glazing rebates.

We only source timber with a low moisture content which prevents movement and micro porous paint ensures a high-quality finish while still letting the timber breathe; ensuring the longevity of our timber products. All the critical joints have a v-joint sealant which ensures further protection from moisture. Rest assured that when you work with us, our timber flush sash windows will perform highly and reliably for your customers.

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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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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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