
Flush casement windows on a Cotswold stone cottage
Flush casement windows in a heritage cream, specified to respect the character of a stone cottage in a Cotswold conservation area.

The sash sits flush within the frame, exactly as a traditional timber window does. The result is a calm, uninterrupted elevation with modern thermal performance behind it and no repainting to look forward to.
On a standard casement window the opening sash sits slightly proud of the frame. On a flush casement it closes into the frame so that the two surfaces sit level, giving the single clean plane that older timber windows have always had.
It sounds like a small distinction. On the elevation of a period house it is the difference between a window that looks right and one that very nearly does. Shadows fall evenly across a flush face, the frame reads as one uninterrupted line, and the eye is not drawn to a stepped edge running around every opening.
That is why flush casements have become our most requested range for older homes across the Cotswolds and the Thames Valley. On stone cottages, farmhouses, Georgian and Victorian properties and homes within conservation areas, they let us preserve the character of the elevation while quietly bringing the performance up to modern standards. They are equally at home on new build and contemporary properties, where the flat face suits a deliberately understated look.
Timber-look options are a large part of the appeal. Woodgrain finishes carry the grain and depth of painted or stained wood, and paired with slim sightlines, a cottage split and the right heritage colour, the result is convincing at the distance a window is actually seen from. What you avoid is the cycle of sanding, filling and repainting that timber demands, along with the swelling, sticking and rot that comes with it.
Behind the traditional appearance the window is thoroughly modern: A-rated glazing as standard, warm-edge spacer bars, multi-point locking and internally beaded sealed units. Every project is personally surveyed, manufactured to measure by an established British manufacturer, and fitted by our own directly employed installers. Work is registered under our Assure registration and covered by an insurance-backed guarantee alongside our 20 Year Guarantee.

Tap any of our 30 colours and woodgrains to see the windows change on a real house. Add the design to your survey request and we'll bring the matching samples.
Anthracite Grey outside with a white interior, a popular way to keep rooms light.
Everything about a flush casement is aimed at looking settled and unremarkable on the elevation, which is exactly what a period property needs.
The sash closes into the frame so both surfaces sit level, giving the clean single plane of a traditional timber window.
Woodgrain foils with the grain and depth of painted or stained wood, in heritage colours chosen against your stone or brick.
A-rated glazing as standard with warm-edge spacer bars, so a period home becomes genuinely comfortable rather than merely draught-free.
Multi-point locking, internally beaded units and laminated glass options, none of which is visible from the street.
The finish is part of the frame, so there is no sanding, filling or repainting cycle and no swelling or sticking in wet weather.
Tight seals and acoustic-grade glazing options reduce road and weather noise noticeably in older properties.
Flush casements are configured much like standard casements, with particular attention to the details that make a period elevation read correctly.
An unequal division with a smaller upper light, the arrangement found on most traditional cottage windows and the quickest way to a convincing period look.
Hinged at the side and opening outwards, handed at survey to suit prevailing wind, paths and neighbouring walls.
Hinged at the head for secure ventilation in poor weather, often sitting above a larger fixed light.
A non-opening pane where ventilation comes from elsewhere, giving the maximum glass area and the cleanest face.
Proportioned and detailed to read as a vertical sliding sash from the street, while operating as a flush casement.
Slim applied bars in traditional layouts, matched to the pattern and width of the windows being replaced.
Angled or curved arrangements for front rooms, with the flush face carried consistently around the whole bay.
Peg stays, casement fasteners and monkey-tail handles in finishes appropriate to the age of the property.
Arrange your free home survey, expert advice, accurate measuring and a fixed written quotation with no pressure.
Heritage colours are where flush casements earn their keep. We bring samples to the survey and hold them against the elevation in daylight before anything is decided.
Soft off-whites that sit gently against Cotswold stone, where bright white can look abrupt.
Muted sage and olive greens, long associated with cottage and farmhouse joinery.
From pale dove greys to deep anthracite, understated on older homes and crisp on contemporary ones.
Woodgrain foils in painted-timber shades, carrying the depth of joinery without the maintenance.
Warmer oak and walnut-toned grains for properties where stained rather than painted joinery is right.
A heritage colour outside for the elevation and a plain white or cream inside to keep rooms light.
Handles, stays and fasteners are available in understated finishes chosen to complement the frame and the age of the property.
Glass is specified alongside the frame: obscure patterns for bathrooms, acoustic units where traffic is a factor, and leaded or decorative detailing where the property already has it.
A heritage appearance should not mean a compromise in comfort. Flush casements are specified to the same standard as everything else we install.
A-rated glazing on every flush casement we install, with higher-performing options where a particular room justifies them.
Warm-edge spacer bars cut the cold bridge at the perimeter of the glass, the usual source of condensation in older homes.
Acoustic-grade sealed units for rooms facing a road or junction, specified where they will actually be noticed.
Multi-point locking and internally beaded units, with laminated glass options on accessible openings and nothing visible from outside.
Ventilation is planned properly so a tighter, warmer period house does not develop damp or stale air.
Deep reveals, arched heads, stone cills and out-of-square openings are surveyed individually and manufactured to suit.
A selection of flush casement installations across Wiltshire, Oxfordshire, Gloucestershire and Berkshire.

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Illustrative imageA selection of recent Thames Frames window projects completed across Wiltshire, Oxfordshire, Gloucestershire and Berkshire.

Flush casement windows in a heritage cream, specified to respect the character of a stone cottage in a Cotswold conservation area.

A whole-house renovation: every window replaced with white uPVC casements and a new Shadow Grey (RAL 7005) composite front door fitted beneath the porch.
View project
First-floor French doors behind a Juliet balcony replaced with a white tilt and turn window, for easy, secure ventilation without leaving doors ajar.
View project"Really happy with our new aluminium sliding doors and three windows for our extension. They look fantastic and have really finished the extension off. The quality is excellent and the fitting was done really well. Everything was straightforward from start to finish and we’re really pleased with the result. Would definitely recommend Thames Frames"
"Thames Frames provided a professional and reliable service from start to finish. The installation was completed to a high standard, the team was punctual and tidy, and the new windows and doors look excellent. I would happily recommend them."
"Fantastic service from Thames Frames. Our new flush windows look stunning and have completely transformed the house. Lee and Trevor were brilliant throughout the installation—friendly, professional and took real pride in their work. Everything was left clean and tidy. Highly recommend!"
Arrange a complimentary home survey with one of our window specialists. We'll bring finish samples, look at them against your elevation, measure each opening precisely and leave you with a fixed written quotation.
Share a few details and a window specialist will be in touch within one working day. No pressure, no pushy sales.
Arrange a complimentary home survey at a time that suits you. We listen carefully, measure precisely and recommend the products best suited to your property.