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Flush Casement Windows

Windows, redefined.

Traditional Aesthetics Without Traditional Pitfalls

Flush casements windows are a timeless, elegant window solution, characterised by sleek window lines that fit flush into the window frame, unlike stormproof windows that overlap in the frame. This gives the Flush window a simple and elegant aesthetic.

The Flush casement window is a superb addition to the Evolution collection, designed to create a stunning focal point and featuring traditional aesthetics. This timber alternative flush-fitting window is ideal for properties that are replacing original flush timber windows and for those wanting authentic looks, who wish to take advantage of modern window technology.

These virtually maintenance–free windows have been developed based on authentic, traditional design and are very popular in period homes and cottages, however we are seeing increasing demand for their use in contemporary new homes and minimalist conversion properties due to their clean, sharp lines. If you want modern features, yet either need or want a timber look flush window, then our modern alternative could be the solution for you.

Clean & SleekMinimalist Design

Why compromise beauty for functionality? Our Flush Window systems bring beautiful timber styling throughout with handcrafted joints and exquisite wood effect detailing across the whole frame. The cool, sleek lines of the Flush casement window are a minimalist’s dream. The greater glazed area allows more light into your home, without sacrificing the energy efficiency.

Whilst this style of window has been traditionally used in older, cottage style properties, the latest trend is that owners and developers of more contemporary properties are turning to flush style windows as it helps maintain the simplistic, architectural outlook they are striving for.

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flush casement windows

Exceptional PerformanceEnergy Efficiency

With a 1.4 or better U value as standard, the heat generated in your home will not be able to escape with the highly energy efficient Flush window. Your bills will reduce in cost and your house will stay warm and cosy for years to come. You can even opt for the ultimate energy saving triple glazing to further reduce noise and conserve heat.

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flush windows

Evolution FlushThe Modern Traditional Window

A classic flush-fitting appearance on the exterior, combined with sumptuous textured detail on the interior make this a truly breathtaking window solution. To personalise your flush windows, you can choose to add Georgian bars, decorative glass or detailed leading to compliment your property.

There are over 200 RAL colour options to available in addition to our standard colour finishes and a high quality range of handles and working peg stays available, all designed and manufactured in the UK.

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flush windows casement

Breath-taking Natural LightInvisiline

All Evolution Storm & Flush windows are available as an Invisiline option. Invisiline windows are constructed with a 127mm sightline across mullions, which compared to the standard 162mm, creates an incredibly sleek window design. The thinner frame and larger glazing area really deliver when it comes to improving the natural light inside your home.

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stormproof windows

Exquisite & Authentic Wood Detailing

With the Evolution Flush window, you can achieve the authentic look of wood, but without the laborious sanding and painting every 5 years. Our innovative woodgrain effect finish, with handcrafted timber look joints, ensures a stunning flawless finish and a virtually maintenance free window.

Our unique technology marries beautiful wooden aesthetics, from an authentic grained finish with beautiful timber styling throughout and the highest performing energy efficiency and technology. It’s not timber. It’s something better!

Evolution Flush Windows Technical Features





Item Specification
  • 70mm or 82mm system
  • Flush sash options
  • Internally glazed
  • Fully integrated dual weather seals
  • Galvanised steel reinforcing built in where necessary
  • A range of deep, timber look sills available
  • Timber style mechanical transom and mullion joints
  • Low E float glass sealed units including 20mm air gap all manufactured to kite mark standard BS5713 Fire Exit/Easy Clean hinge Toughened glass to BS6262 Class A
Glass Options:
  • Double or triple glazing available
  • Various patterned glass for varying degrees of obscurity
  • Laminated glass, acoustic glass and solar control glass options
  • Square and diamond leads and coloured glass options
Window Finish Options:
  • Gloss White
  • White Wood
  • Cream Wood
  • Tudor Effect Wood
  • Black Wood
  • Natural Wood
  • Rosewood
  • Evolution Oak Wood
  • Anthracite Grey Wood
  • Agate Grey Wood
  • Olive Grey Wood
  • Windows painted to one of over 200 custom RAL colours
Locking and Hardware:
  • Multipoint locking with shoot bolts
  • Key locking push button handle
  • Night vent positions available
  • Traditional wrought iron handles and peg stays (working and decorative), standard cranked handles and contemporary Ventiss handles and
  • Peg stay (working and decorative) range available
  • Traditional range colours – Black and Pewter
  • Standard range colours – White, Black, Bright Chrome, Satin Chrome, Bronze, Gold
  • Ventiss range colours – White, Black, Gold, Gunmetal, Chrome, Satin Chrome
  • Ventiss Designer range colours - Chrome & White, Chrome & Black, Chrome & Gold, Chrome & Gunmetal, Chrome & Satin Chrome
Hinge Options:
  • Fire Exit/Easy Clean Hinge
  • Security claws
  • Child Restrictors
Internal Bead Finish:
  • Ovolo beads
Georgian Bar Detail Options:
  • Putty outside, Ovolo inside
  • 20mm Bar and 36mm Cottage style bar internal and external available
  • All Georgian astragal bars match the colour of the window, with a wood grain finish
Internal Bead Finish:
  • Ovolo beads









Committed To Quality10 Year Guarantee

Renowned for exceptional service at every stage of the design, manufacture and installation process; our customer care team ensure each customer receives the very best experience. We’re so confident of the enduring quality of the windows and doors we produce, we give a 10 Year guarantee on all Evolution products, providing each customer with the ultimate peace of mind.

Like to know more? Get in Touch

To request your free brochure, free no-obligation quotation, or to request a call back from one of our advisors, please complete your details below. Alternatively call us 01767 821548.


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Your next steps

Request a brochure

If you can’t visit your local Evolution showroom but still want to find out more about our beautiful handcrafted windows and doors then simply order a brochure today and be inspired.


Request a quotation

Speak to one of our friendly, experienced designers to discuss your requirements and individual project needs. We will provide you with advice and a detailed, no-obligation quotation.

Get a quote

Visit a showroom

To truly explore Evolution, why not visit your local showroom where you can see the Evolution difference for yourself. We are also always happy to welcome visitors to our Bedfordshire head office.

Visit today

The UK's finest timber alternative windows and doors.