Flush Casement Windows

The flush casement is designed along simple lines, intended to replicate the earliest glazed timber windows from centuries past. Characterised by a simple clarity of design and geometry, the casement’s opening lights do not sit proud of the outer frame. Envisage Windows brings the traditional timbered style of the late middle ages in line with rigour of the 21st century, offering exceptional security, performance and insulation.

Because it maintains the original proportions used by carpenters for hundreds of years, the flush casement can be easily adapted to accommodate a wide variety of period and contemporary hardware or colours, which means that it can give you the finish that suits you best. An adaptable design means casement windows will suit any home, whether it’s a new build, or a heritage property.

Our flush casement windows guarantee excellent quality, the same easy care as our uPVC frames, and robust durability as standard. Because we know the importance of security, we only ever use multipoint locking systems of the highest calibre. Nobody wants draughts around their window frames, leading to unnecessary fuel bills, so insulation is a priority. We utilise smart design and high-end double glazing to guarantee warmth and comfort. The rest of the window is up to you.


Our Service

  • Lincolnshire & East Midlands
  • Quick, no obligation quotes
  • No-pressure sales team
  • Expert design support
  • Top quality products
  • The latest technology
  • Helpful, friendly support team
  • Top after-sales support

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Lines and proportions

Whether you want to keep it simple or add astragal bars for detail, you can always manage the precise look you want for your casement windows. Every component is constructed to authentic proportions, custom-made for style and elegance.

Handles and stays

It’s the little details that matter. Your new window will look its best when your complement it with the right hardware. We have a wide choice of handles and stays in designs that range from the traditional to the contemporary, and we will help you choose ones that best work with your windows and the rest of your home.

Shades and textures

The flat white standard of uPVC has been and gone. Modern finishes are both soft and subtle, capable of mimicking the grain effect in many different timbers. Period shades are also available, as are dual-coloured options that blend so well with line-wash, brickwork, stone and, of course, your interior décor.

Our ‘Secure It’ locking system provides you with peace of mind.

With all our casement windows featuring our ‘Secure It’ window locking system, you can rest safe in the knowledge that your home and family are protected from break ins. The lock runs the whole length of the window and has been tested over 30,000 times for durability. Our system boasts the ‘Secured by Design’ marking, as approved by the police, and exceeds the current industry demands for security features. Envisage Windows promise the ultimate in home security.

Finishing Touches

What makes a perfect finish? Every aspect of your windows working in unison. This includes handles and hinges, and we’re not just talking functionality, here. Appearances are important and the right hardware can transform a window into something truly beautiful.

In a modern home, simple hardware with striking lines will often have the best effect. A more traditional home may well want more detailing. In either case, you need hardware that has been built to last, constructed from hardy materials, and with a first class finish. You’ll want handles and locks that combine aesthetics with ease of use, and which match your lifestyle. Finally, your choice of colours is important, so that they work with your frames, or your door – be that as a contrast, or a complement.


We include a full range of accessories, developed to fit perfectly with our windows, in the correct proportions. Astragal bars mean you can recreate a small-paned window without going through the hassle of separate glazing, or having to paint around window beads. A single astragal bar dramatically changes the appearance of a window, or forms an interesting accent within a larger plane of glass.

Arched-head inserts can soften the exterior lines of your casement windows. Trickle vents allow for secure night-time ventilation – and, don’t forget about the window sills, to finish off any installation in style.

There’s more to the glass than meets the eye.

The glass used in our casement windows has a near invisible coating that helps keep your home warm. Sealed pane units are filled with inert gases, forming a barrier between the outdoor chill and the warm inside your house. Picking the right glass leads to a more comfortable home, and our team of advisors will be happy to steer you in the right direction.

An impressive range of colours, suitable for every kind of home.

We’ll admit it – we don’t quite have every colour of the rainbow, but we’re pretty close, having a plentiful range of textures and wood effects in a host of shades that are sure to meet your needs. If you wish, you can choose different colours and finishes for outdoor and indoor use. Whether it’s your intention to stand out from the crowd or blend in to your surroundings, we can help you fulfil your vision, finding the finish for your home or work site.

Windows done differently for the East Midlands

We have a 30 year heritage in home improvements, including windows, so we know what we’re doing. We’re very proud of the quality of our products which are designed and manufactured using the latest technology, but that isn’t what makes us different. What makes us even prouder is the service we provide to our customers. Our number one objective is to make home improvements, such as a new orangery, an enjoyable experience. Deciding to invest in new windows can be a daunting task, so we’re here to make the whole journey easier. Take a look below for more reasons why James Oliver are the right company for you.

No Pressure Sales

The windows, conservatories and orangeries market is tarnished by a reputation for aggressive sales techniques, which can include pushy salesmen, guilt tripping techniques and dynamic pricing. You will never get that from James Oliver. Our sales teamed are trained and motivated to be not only fully transparent, but to make  our customers at ease with the options available to them. They won’t stay any longer than they need to and won’t force you into decisions that you’re not comfortable with – guaranteed!

Designed for you

A really important ethos of our business is to make the customer feel comfortable with their home improvement decisions. Our experts are there to help you make great decisions from all the options available to you, whether that be shape, style, colour, material or finishes. This is a big investment, you need to be sure that everything is right for your personality and the character of your home. We’ll provide you with all the options and give you our expert advice, but will never force decisions that aren’t right.

Hassle Free

Our services and installations teams are driven by the same objectives to make the experience an enjoyable one, which comes from a number of important considerations. Firstly, we ensure that the plans and schedules for your conservatory installation are fully communicated and in line with your own needs and requirements. Secondly, we always ensure that our installations are completed swiftly and efficiently. Nobody wants a project that lasts for weeks or months without signs of completion. Finally, our teams always clear up after themselves ensuring that no mess is left behind, meaning that all you’re left with is a new conservatory that you and your family can enjoy for years to come.

Free Tailor Made Designs

For further information on the fabulous range of home improvement products available, simply request your free brochure online today!

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Our Windows Range

Flush Casement Windows

With a similar look to timber windows, flush casement windows are the ideal way to get a traditional look with a modern feel.

Replacement Windows

If you need replacement windows to match the rest in your home then never fear; we have a range of styles and sizes for you to choose from.

Windows & Doors

For the perfect finishing touches to the outside of your home our ranges of windows and doors have everything you could need.

Thermal Windows

To help keep the heat inside your home thermal windows are a must, ensuring you stay energy efficient and comfortable all year.

Georgian Windows

Naturally elegant with their clean simple lines, our Georgian windows are designed to add durability without sacrificing on style.

Bay Windows

A bay window is a lovely addition to your home and with our selection you’re bound to find the right one to install

Triple Glazing

With three panes of glass our triple glazed windows are extremely capable at reducing external noise and insulating your home.

Energy Efficient Windows

Being energy efficient in your home can help to save costs in the long run, which is why our energy efficient windows are a must have.

Coloured Windows

For something a little different our colour window frames are the ideal choice, helping to create an eyecatching look.

Woodgrain Windows

For a traditional look our woodgrain windows are the obvious choice, combining traditional looks with modern technology.

Aluminium Windows

Incredibly attractive looking and strong too, our aluminium windows are suitable for all homes and can endure all types of weather.

UPVC Windows

Strong and durable, our UPVC windows are designed to last for years to come all whilst looking exceptionally neat and stylish.

Heritage Windows

If you want to add that final elegant touch to your home then our heritage range of windows is the ideal solution for you.

Sash Windows

Easy to operate and attractive to look at both inside and out, sash windows are a popular choice for a wide range of reasons.

Tilt & Turn Windows

Able to allow fresh air into your home without sacrificing on safety, tilt & turn windows are ideal if you like your home to feel fresh.

Casement Windows

Casement windows are ideal for period properties, designed with simple lines so as not to interrupt the look of your property.

Double Glazing

Double glazing is a must for any home, providing substantial insulation and protection against the elements all year long.