A window style, not a material

FlushCasementWindowsinPoole&Bournemouth

A flush casement is a style of window, where the opening sash sits flat within the frame instead of sitting proud of it. Here's what makes that different, and how we deliver it.

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What 'flush casement' actually means

A flush casement window is one where the opening sash sits completely flat within the frame, with no lip and no step. That gives one unbroken face from the outside, exactly like the flush-fitting sashes that were standard in timber joinery before the 1930s. A standard, or lipped, casement is built the opposite way round: the sash sits proud of the frame and oversails it, which is what most people mean when they say a uPVC window looks plastic from the street.

Flush casement describes the STYLE, not the material. It's the same distinction as asking for a bay window or a sliding sash: the answer to "what does it look like" is separate from the answer to "what's it made of". We fit the flush casement style through our Timberlook range, a woodgrain-finish uPVC product built specifically to reproduce that traditional sightline and joinery detail.

The look, explained

Why it suits period and conservation-area homes

Most Victorian, Edwardian and 1930s houses were originally built with flush-fitting timber sashes, so a flush casement keeps the sightline the house was designed with. A standard lipped uPVC casement breaks that line: the sash oversailing the frame is usually what gives a replacement window away from the street, even on a house that's otherwise well kept. That's why flush casement is the style most often specified where a house's original character matters, rather than a plain like-for-like swap.

Keeps the unbroken sightline a period elevation was built with
The corner joint is usually the tell: a flush casement avoids the visible welded mitre a standard uPVC casement carries
Our own installations are in Smooth Anthracite; twelve more finishes are available on the Timberlook range

The front of a house fitted with Smooth Anthracite flush casement windows, our van parked on the drive, one of our own installations

Still deciding on the material itself?

Flush casement is one style, and we deliver it through Timberlook specifically. If you're not sure that's the material for you, here's the full range we fit.

Conservation areas & listed buildings

Will the council let you fit these?

Conservation area consent was abolished back in 2013, so the route now is ordinary planning permission. A lot of like-for-like replacement counts as permitted development and needs no consent at all, though an Article 4 direction can remove that right in a specific area, and listed buildings are always assessed individually. What a planning officer actually looks at is appearance, not material: the profile dimensions, the sightline widths, the joint finish and the glazing. Whether your own project gets a straightforward answer is always down to your local planning authority.

Permitted development often covers like-for-like replacement, so no separate consent is needed
An Article 4 direction can remove that right in specific areas, so it's always worth checking first
Our Timberlook range has been recognised elsewhere as a genuine match for traditional flush casements, including by name from a Cotswold Council heritage officer — see the full detail on our Timberlook page

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A full house elevation fitted with Smooth Anthracite flush casement windows, one of our own installations

The bits people worry about

What if flush casement isn't actually the right style for my house?
That's what the free survey's for. Josh brings physical swatches and talks you through the look on your own elevation before you commit to anything.
Will it end up looking plastic, like a cheap replacement?
No. The flush sightline is the detail that stops that happening, and it's the whole reason the style exists as an option.
Is there building-regs hassle I have to sort myself?
No. As an Assure-registered installer, we self-certify the work against Building Regulations ourselves, so there's no separate council application for you to arrange.

How it works, start to finish

No salesman, just Josh.

The survey

Josh surveys every job himself and brings the physical colour swatches, so you see the finish before deciding.

The quote

You get a written quote back, with everything it covers set out clearly and no hidden extras.

The fit

Your new windows are fitted by Wilshaw, with the site left as tidy as we found it.

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What customers say

See the live reviews on our Google Business Profile.

5.025 reviews on Google

Natasha Evans

Josh and his team worked incredibly hard replacing all of the windows and doors in our house, including fitting a beautiful bifold door in place of our old French doors. We could not be happier with the results. The quality of the workmanship was excellent, and Josh was fantastic with communication throughout the whole process. He was reliable, professional, and kept us updated every step of the way. We would highly recommend him to anyone looking for high-quality work and great service.

Andy

Bournemouth

Josh installed our new windows, triple track doors, roof lights and front door at our house in Bournemouth. A very professional, tidy and efficient service from beginning to end. Would highly recommend Wilshaw Glazing.

Connor McKay

Had new windows fitted throughout the house. Josh and the team were brilliant - turned up when they said they would, worked quickly, and left everything spotless. Really happy with how they look. Definitely recommend.

What's the difference between flush casement and standard casement windows?

A flush casement sash sits flat within the frame, with no lip and no step, giving one unbroken face from the outside. A standard, or lipped, casement has the sash sitting proud of the frame, which is usually what makes a replacement window read as plastic from the street.

Do you fit flush casement in plain uPVC or aluminium?

We fit the flush casement style through our Timberlook range, which is a woodgrain-finish uPVC product built specifically for it. If you want a different material, our standard uPVC and aluminium ranges are both available in a standard casement style, and Josh can talk you through which suits your house at survey.

Will the council let me have flush casement windows in a conservation area?

Often, yes. A lot of like-for-like replacement counts as permitted development and needs no separate consent, though an Article 4 direction can remove that right locally, and it's always your council's final call. See the section above, or our Timberlook page for the full detail including a named heritage officer's acceptance.

How much do flush casement windows cost?

We don't publish set prices, because every job is different: the number of openings, the finish you choose and the glazing spec all change the cost. Josh surveys your job in person, so you get an accurate written quote rather than a guess.

What is Timberlook?

Timberlook is the flush casement range we fit, and the line Josh is actively growing because he rates it above anything else on the market for a period property. See our Timberlook page for the full range of finishes, hardware and specification.

What happens next if I want a quote?

Josh surveys every job himself, brings the physical colour swatches so you can see the finish, and measures up while he's there. You'll get a written quote back with everything it covers set out clearly.