Flush casement windows: the traditional look, done properly

The sash closes level with the frame rather than standing proud of it — the detail that makes a modern window read as period joinery.

Flat face and crisp shadow lines, like a timber window
Georgian bar, leaded and diamond leaded options
Modern sealed units, seals and multi-point locking

Get a free quote 01342 410079

East Grinstead showroom · covering Sussex, Surrey and Kent

Flush casement windows with Georgian bars set into a brick elevation

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10 year guarantee

On every product we supply and install

Family run since 2007

Our own fitters — never subcontracted out

The difference

One detail, and you can see it from the pavement

It sounds like a small thing. In practice it’s the main reason a replacement window looks right on an older house — or doesn’t.

On a traditional timber casement the sash sits inside the frame and finishes flush with it. That flat plane catches light evenly and throws one clean shadow line around the opening.

A standard modern casement overlaps the frame and projects forward instead — barely noticeable on a 1970s house, the first thing that looks wrong on a cottage.

Flush casements bring that profile back, with a sealed unit, compression seals and multi-point locking behind it.

Rendered and brick home fitted with a full set of white replacement windows

White bay window with leaded glass beneath a mock Tudor gable

Compare

Flush casement or standard casement?

Both are excellent windows. The choice is mostly about the property and where the window is going.

Feature	Flush casement	Standard casement
How the sash closes	Level with the frame, one flat face	Slightly proud of the frame, with a visible step
Best suited to	Period homes, cottages, conservation areas, front elevations	Most modern homes, rear elevations, budget-conscious projects
Thermal and acoustic performance	Comparable — both compress onto seals	Comparable — both compress onto seals
Georgian bars and leaded glass
Multi-point locking
Relative cost	Higher	Lower

Not sure which way to go? We’ll show you both at survey with your elevation in front of us.

Benefits

Why people choose flush casements

Period-correct lines
The flat face and shadow line of a traditional joinery-made window.
Conservation friendly
Often the style accepted where a standard casement would be refused.
Modern performance
Sealed units, compression seals and thermally efficient frames throughout.
Heritage colours
Cream, Chartwell green, greys and woodgrains that suit older properties.
Secure
The same multi-point locking as the rest of our range.
Low upkeep
In uPVC or aluminium, the look of timber without the repainting.

Materials

Available in each material

Flush casements work in all three — timber for authenticity, uPVC for value, aluminium for slimmer frames.

White uPVC casement windows fitted to a rendered house

uPVC Windows

The most popular choice: warm, secure and virtually maintenance free, in a wide range of colours and woodgrain finishes.

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Cream framed windows in a traditional cottage looking onto the garden

Wooden Windows

Real timber for period and conservation properties, engineered and factory-finished so it stands up to the weather.

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Aluminium Windows

Slim, strong frames that carry more glass and less frame — ideal for extensions, large openings and contemporary homes.

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Buying online? Our shop is on its way

Flush casements are made to measure for each opening. Send us your sizes and we’ll put a price together.

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Questions

Flush casement questions

Can’t see what you need? Call 01342 410079 and we’ll answer it properly.

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What makes a casement “flush”?

On a standard casement the opening sash sits slightly proud of the outer frame, so you can see and feel a step when it’s closed. On a flush casement the sash closes level with the frame, giving one continuous flat face — the way a traditional joinery-made timber window sits.

Are flush casements worth the extra cost?

On a period property or anywhere the elevation is on show, usually yes. The flat face and the shadow line it creates is the detail that stops a modern window looking obviously modern. On a rear elevation nobody sees, a standard casement may be the better use of the budget.

Can I have Georgian bars or leaded glass?

Yes — Georgian bars, leaded and diamond leaded designs all work with flush casements, and it’s a common combination on cottages and older houses. We’ll show you the options at survey.

Do flush casements perform as well as standard ones?

Yes. The sash still compresses onto seals all the way round when it shuts, so thermal and acoustic performance is comparable. The difference is in how it looks, not how it works.

Will a flush casement suit a conservation area?

It’s often the compromise that gets accepted where full timber isn’t required — but conservation areas vary and listed buildings have their own rules. Check with your local authority, and we’ll advise on what we’ve seen approved locally.

Where we work

Flush casement windows in East Grinstead and across Sussex, Surrey and Kent

We’re based on Station Road in East Grinstead, where West Sussex meets Surrey and Kent, and our own team works throughout all three counties.

Check we cover your area

Towns we cover include

East Grinstead
Crawley
Horley
Haywards Heath
Burgess Hill
Horsham
Crowborough
Tunbridge Wells
Tonbridge
Sevenoaks
Redhill
Reigate
Caterham

…and the villages in between. If you’re in Sussex, Surrey and Kent, the answer is almost certainly yes.

Free quotations

Get a price for flush casement windows

Book a free survey and we’ll bring samples so you can see the flush profile against your existing windows.

Request a free quote 01342 410079

Mon–Fri 9am–5pm · Sat 10am–1pm