Flush casement windows have become one of the most requested styles for homeowners who want a clean, traditional look. But what actually makes a casement flush, and why do people go for them over a standard casement? This guide explains flush casement windows in plain terms, covering the style, the benefits and roughly what they cost.
What are flush casement windows?
Flush casement windows are casement windows where the opening sash sits flush within the frame when closed, so the face of the sash and the face of the frame line up in the same plane. Instead of the sash sitting proud and overlapping the frame, everything is level, giving a smooth, flat appearance from the outside.
Compare that to a standard (or "stormproof") casement, where the sash overlaps the frame and sits slightly forward, creating a stepped, layered look. Both open on hinges, but the flush version has that clean, even face that suits period homes so well.
The flush look copies the traditional timber joinery you see on older properties, which is exactly why flush casement windows are popular on the period terraces and cottages around York and North Yorkshire.
What makes a casement "flush"?
The word flush simply describes how the parts sit together. On a flush casement:
- The sash and frame line up so the outer face is smooth and level all round.
- There is no overhanging lip where the sash meets the frame.
- The shadow lines are neat and even, mimicking old timber windows.
Achieving that flat face takes a slightly different frame design and, on uPVC and timber, careful engineering to keep the seal weathertight while sitting flush. On aluminium and timber it comes fairly naturally; on uPVC it takes a well-made flush system to get the look right.
Why choose flush casement windows?
There are a few good reasons homeowners pick the flush style:
- Period-friendly looks. The flat face and slim sightlines echo traditional joinery, so they suit older and heritage homes without looking out of place.
- Clean, modern appeal too. The smooth face also works on contemporary homes, where a crisp, uncluttered window suits the style.
- Versatile finishes. Flush casements come in heritage colours, woodgrain effects and dual colours (one shade outside, another in).
- Fewer ledges to gather dirt. The flat face has less of a lip for muck and rainwater to sit on.
They are one of those styles that manages to look right on almost any age of property, which is a big part of their appeal.
Flush casement materials
Flush casements are made in the main window materials, and the choice affects both look and upkeep:
- uPVC is warm, low maintenance and good value. A quality flush uPVC window gives the traditional look without the painting and care that timber needs.
- Timber offers the most authentic period appearance and is often specified in conservation settings, but it needs regular upkeep.
- Aluminium gives the slimmest frames and a sharp, modern edge. For period properties where you want authentic detailing in a low-maintenance material, our heritage aluminium windows and doors are a strong option.
In a conservation area or on a listed building there may be rules about materials and style, so check the current guidance with your local authority before ordering.
Are flush casements good for period and conservation homes?
Yes, and that is a big part of why they exist. Many older homes originally had flush timber casements, so a like-for-like flush replacement keeps the character intact. In conservation areas, planners often prefer a flush profile because it matches the original look far better than a chunky stormproof casement.
That said, rules vary from area to area and change over time, so never assume. Always check what is allowed with your local authority, and if the property is listed you may need consent before making changes.
Flush casement vs stormproof casement
The two main casement styles are worth comparing directly:
- Flush casement: sash sits level with the frame, smooth flat face, traditional look, great for period and heritage homes.
- Stormproof casement: sash overlaps and sits proud of the frame, stepped profile, with an extra weather lip that some argue helps in very exposed spots.
Both are weathertight when well made and fitted. The choice mostly comes down to the look you want. Given Yorkshire weather, a good flush system is perfectly capable of keeping the wind and rain out, so you rarely have to sacrifice looks for performance.
How much do flush casement windows cost?
Flush casements typically sit a little above a basic stormproof casement, because of the frame design and finish, though the gap is not huge on uPVC. As a rough UK guide, a supplied-and-fitted flush casement window falls in the region of several hundred pounds per window, rising with size, material, glazing and colour. Timber and aluminium usually cost more than uPVC. Treat any online figure as a ballpark only, because the real price depends on your home. For an accurate number, have them measured. You can request a free quote and we will give you an honest price.
FAQs
What is the difference between a flush and a standard casement window?
On a flush casement the sash sits level with the frame for a smooth, flat face. On a standard (stormproof) casement the sash overlaps and sits slightly proud, giving a stepped profile. Both open on hinges; the difference is mainly in the look.
Are flush casement windows more expensive?
They usually cost a little more than a basic stormproof casement because of the frame design and finish, but on uPVC the difference is modest. Material, size, glazing and colour make more difference to the final price than the flush style itself.
Are flush casement windows suitable for conservation areas?
Often yes, because the flush profile matches traditional joinery that planners tend to prefer. Rules vary and change, though, so always check the current requirements with your local authority, and get consent first if the property is listed.
Do flush casement windows come in uPVC?
Yes. Modern flush uPVC systems give the traditional flat-faced look with the warmth and low maintenance of uPVC, and they come in heritage colours and woodgrain finishes that suit older homes.
Rounding up
Flush casement windows sit level with the frame for a smooth, traditional face that suits period and modern homes alike. They come in uPVC, timber and aluminium, work well in conservation settings, and cost a touch more than a basic casement for the look. Want to see the finishes and colours in full? Download our latest brochure, or book a free quote and we will come and measure up.