The traditional flush sash look in modern materials
Flush casement windows are the modern version of traditional timber flush sashes. The sash sits level with the frame when closed, rather than sitting proud of it like a standard casement design. The smooth, understated appearance reproduces the look of original timber flush sashes in modern uPVC, aluminium or contemporary timber construction.
We supply and fit this style within an 50 miles radius of our Rushden showroom, with uPVC, aluminium and timber options available in a wide range of colours and finishes, including popular anthracite grey, matt black and heritage colours.
A flush casement is a side-hinged design where the sash closes level with the frame, creating a flat surface across the front. Standard casements have a sash that sits slightly proud of the frame when closed, creating a small stepped profile around the perimeter. Flush designs remove that step.
The visual effect is significant. Whereas standard casements feature visible sash-on-frame detailing, the flush design creates a flatter, more continuous appearance from the outside, closer to the look of traditional timber flush sashes.
The operating mechanism is similar to a standard casement. Multi-point locking engages around the frame when closed. A handle on the inside releases the locks, and the sash swings outwards on side hinges. The flush appearance is defined by the way the sash sits within the frame.
Flush casement windows suit several specific situations particularly well.
For period properties where the original frames would have been timber flush sash, a flush design in uPVC or modern timber maintains the traditional appearance while delivering current thermal performance and security. This style may also be more appropriate for properties in conservation areas, depending on the building and local planning requirements.
For contemporary properties wanting a minimalist, clean aesthetic, the flush appearance avoids the busy sash-on-frame detailing of standard casements. The flatter profile delivers a more architectural, design-led look, especially when finished in matt black or anthracite grey on modern new builds.
For homeowners replacing older windows on properties from the 1920s through 1960s, flush casements can provide a closer visual match to the original style than standard designs, especially when paired with authentic wood-grain foil finishes on uPVC frames.
uPVC flush casement windows are a popular choice in the UK. The Profile 22 system from Emplas and similar multi-chamber uPVC profiles deliver the flush appearance with multi-chamber construction for thermal performance, multi-point locking for security, and the low-maintenance benefits of modern uPVC.
Our uPVC range comes with internally-beaded double glazing as standard, multi-point locking, and a wide range of colours and finishes available. Authentic wood-grain foils give the timber appearance without the maintenance demands of real wood, with golden oak, Irish Oak and rosewood among the popular heritage finishes.
Typical fitted prices range from £500 to £900 depending on size, glazing spec and colour. The price sits slightly above standard uPVC casement designs because of the more complex frame engineering needed to deliver the flush appearance.
The refined appearance of a flush design is easier to appreciate when viewed in person. Our Rushden showroom has full-size samples alongside standard casements for direct visual comparison, with uPVC, aluminium and timber options available in popular colours and finishes.
Free no-obligation quotes and free home surveys within the 50 miles installation area.
They are side-hinged designs where the opening sash sits level with the outer frame when closed. This creates a flat, clean appearance inspired by traditional timber flush sashes. Modern versions are available in uPVC, aluminium and timber, making them suitable for both period properties and contemporary homes.
The main difference is the way the sash sits against the frame. On a standard casement, it usually sits slightly proud of the frame when closed. With a flush design, the sash sits level with the frame, giving a smoother and more traditional-looking finish.
Prices depend on the material, size, glazing specification, colour and hardware options. As a guide, fitted uPVC versions often cost around £500 to £900, aluminium around £800 to £1,400, and timber around £1,000 to £2,000. They usually cost slightly more than standard casements because of the more detailed frame design.
Yes. Modern designs can be highly energy efficient when fitted with quality double or triple glazing, Low-E glass, effective weather seals and insulated frame profiles. The tight closing design helps reduce draughts and heat loss, improving comfort throughout the home.
Yes. Black finishes are available across uPVC, aluminium and timber options. They work well on contemporary new builds and extensions, and can also create a strong contrast against light render, stone or red brick on older properties. Other colours and wood-grain finishes may also be available depending on the chosen material.
Often, yes. Their flat sash design is closer to the appearance of traditional timber frames than many standard casement styles. They can work well on Victorian, Edwardian, 1930s and cottage-style homes, although local planning or heritage requirements should be considered where applicable.
They can provide good security when manufactured with multi-point locking, robust hinges, secure handles and internally beaded glazing. Additional security options may also be available for ground-floor openings or more exposed areas of the property.
Homeefe supplies and installs flush casement windows from our Rushden showroom for homeowners across Northamptonshire and nearby areas. Our installation area covers approximately 80 km, including Wellingborough, Northampton, Bedford, Kettering, Cambridge, Peterborough, Corby, Milton Keynes, Rugby and surrounding towns. We offer home surveys and itemised quotes for replacement and new installation projects.
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Aluminium works well where slim sightlines and a contemporary finish are important. Its strength can support larger sashes while keeping the visible frame relatively slim. Powder-coated surfaces are durable and need little routine maintenance.
It is a good fit for modern new builds and contemporary renovations, particularly where a larger glass area and clean architectural lines are part of the design. Anthracite grey, matt black and warm white are popular colour choices.
Fitted prices are typically between £800 and £1,400.
Timber is often chosen for period properties, listed buildings and homes in conservation areas where natural wood forms part of the character of the building. Engineered timber offers better dimensional stability than traditional solid sections and can be stained, oiled or painted.
It also gives a close visual match to traditional flush sashes. Some maintenance is still needed, particularly on exposed elevations, with the timing depending on the finish and local conditions.
Expect fitted prices of around £1,000 to £2,000.
There is a good choice of finishes across uPVC, aluminium and timber. Popular options include anthracite grey, matt black, classic white, traditional cream and Chartwell Green.
Black can create a strong contrast against light render or red brick and also works well on modern new builds. Anthracite and agate grey suit a more contemporary look, while white remains a straightforward choice for traditional properties.
Dual-colour finishes allow the outside and inside to be specified differently, so the exterior can suit the elevation while the interior works with the room. Wood-grain foils are also available on uPVC where a timber-style appearance is wanted without the same maintenance.
Double-glazed sealed units come as standard. They provide good thermal performance, help reduce outside noise and can also reduce condensation compared with single glazing.
Triple glazing is available where additional insulation is needed, for example on exposed elevations or properties close to busy roads. The extra pane and sealed cavity can reduce heat loss further.
Low-E glass is used with both double and triple-glazed units. Its thin metallic coating helps reflect heat back into the room while still allowing natural light through.
For heritage properties, slim-profile double glazing may be available where a standard sealed unit would look too heavy. Acoustic laminated glass can also be specified where outside noise is a concern.
The exact security specification depends on the system. Features can include multi-point locking, internally-beaded glazing and additional locking points around the sash.
PAS 24 certification is available on selected configurations. Secured by Design accredited options may also be available on certain systems where an enhanced security specification is required.
We install flush casement windows in Northamptonshire within an 50 miles radius of our Rushden showroom, covering Northampton, Bedford, Milton Keynes, Kettering, Cambridge, Peterborough, Rugby, Hemel Hempstead, Wellingborough, Corby and surrounding towns.
Eligible replacement installations are registered through FENSA. The certificate is issued after completion and stays with the property, which can be useful when the house is sold.
Lead times for installation
uPVC usually takes around 5 to 7 weeks for delivery and fitting. Aluminium is typically 7 to 9 weeks, while timber is usually 8 to 10 weeks because of the additional finishing process.
A full-house replacement is normally a one- or two-day job, depending on the number of openings and whether any additional structural work is needed.
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