Casement Window Installers In Essex
Casement Windows By Greenoaks
At Greenoak Concept & Design, we believe in offering the best possible windows for your home, and that includes our top-of-the-line casement windows. Casement windows are hinged on the side and open outward using a crank or handle. This design allows for excellent ventilation and unobstructed views when open. We use Liniar’s industry-leading window extrusions, crafted from 100% lead-free PVCu. Their innovative chamber systems provide superior insulation, strength, and acoustics, while the bubble gasket creates an enhanced weather seal. This means you’ll enjoy a quieter, more comfortable home with less energy wasted.
Market-Leading Energy Efficiency
With the introduction of our new casement windows, we are offering superior energy efficiency, market-leading U-values and a drive towards sustainability.
As the Future homes standard are introduced, the energy efficiency of a home and U-Values for windows will become more important. Greenoak Concept & design Double Glazed and Triple glazed Casement windows have an ultra-low U-value. Our Liniar frames are made with recycled uPVC and the window can be recycled at the end of life to reduce the impact on the environment.
Greenoak Concept & Design
Casement Window Gallery














Choose the perfect finish from our wide array of combinations
We understand that your windows should complement your unique style, which is why we offer a wide range of colour options and combinations for your Greenoak casement windows. From classic neutrals to bold modern tones, with the option for a different colour on the interior and exterior, there’s a perfect combination to suit any space in your home.
Casement Window Furniture
Frequently Asked
Questions
If you have any questions in relation to our casement windows, then look no further. This FAQ section answers some of the most common questions we come across. If what you had in mind is not mentioned here, please don’t hesitate to contact us and we will be happy to answer any question you may have.
Side-Hung: The most popular type, these windows boast hinges on one side and open outwards.
Single Casement: This basic style features a single frame, typically side-hung for classic functionality.
Double Casement (French Casement): Featuring two side-hung frames with central mullions, these windows open outwards on both sides for a wider opening.
Awning Window: Hinged at the top, awning windows swing outwards from the bottom, ideal for deflecting rain.
Hopper Window: Hinged at the bottom, these windows open inwards at the top, offering ventilation and security for upper floors.
Greenoak Concept & Design uses Liniar’s industry-leading window extrusions, specifically designed for exceptional thermal performance. The chamber systems and 100% lead-free PVCu construction provide excellent insulation, reducing heat loss in winter and heat gain in summer. This translates to lower energy bills and a more comfortable living environment.
Window Frame – holds the casement window in place.
Window Sill (or cill) – forms the bottom of the window frame and directs water away from the frame.
Casement – is the part of the window that opens, securing the glazing in place.
Mullion – is the vertical strip that divides separate window units.
Transom – is the horizontal strip that divides separate window units.
Lock Handle – the window’s locking mechanism is located on the casement jamb.
Trickle Vent – at the top of the window, trickle vents consist of a grill on the outside and a closing vent on the inside.
The flush casement window offers a sleek upgrade to the traditional casement. Unlike standard designs that protrude from the frame, the flush casement sits seamlessly within it. This creates a modern aesthetic and boasts improved weatherproofing and draft resistance. Combined with a slim aluminium frame, it’s the perfect choice for a contemporary look.
Casement windows shine with their versatility. From classic styles to contemporary looks, their material options make them suitable for any property.
However, it’s important to note their size limitation. The weight of the glass panel dictates the maximum size a single hinge can support. This is why casement windows often come with various sized panels in a single frame.
We are confident in the quality and durability of our Greenoak casement windows. That’s why we offer a comprehensive warranty on both the Liniar profiles and the manufacturing process. The exact terms of the warranty will vary depending on the specific product, so don’t hesitate to contact our team for detailed information.
Casement windows are generally considered a cost-effective option, with white uPVC being the most affordable choice. Prices typically range from £600 to £2,000 per window, depending on size, glazing design, and the number of windows replaced at once. While the average cost for new windows falls between £600 and £3,600 per window, remember, the final price depends on your specific customisations.
The world of window glass extends far beyond a basic pane! Here’s a breakdown of popular options to help you pick the best fit for your needs:
Low-E Glass: This “all-rounder” delivers impressive energy efficiency, making it a popular choice.
Low-Iron Glass: Offering superior clarity and maintaining energy efficiency, this glass allows for a more natural view.
Toughened Glass: Boasting five times the strength of standard glass, it prioritises safety.
Laminated Glass: Featuring a plastic interlayer, this glass enhances insulation and provides increased resistance to damage.
Exceptional from start to finish. From the initial quotation with Dale, to the exceptional installation team. along with regular communication from the team to let us know what was going on with our job, all the way through to completion. The install team were polite and the work was delivered to a very high standard. We are very happy with our conservatory conversion. Allowing is to get so much more from the room. It already feels so much cooler and will be a different room in the winter. Thanks to Dale and the team for your great work. I wouldn’t hesitate to recommend GreenOak and will definitely use them in the future!!!
Hardie Plank Fitted. I cannot recommend this company enough. From the start of the process to the end they have been nothing but professional. Dale explained everything & we have been kept informed throughout the whole process. We are extremely pleased with the outcome & are glad we choose Greenoaks to carry out the work.
Thanks to your engineer for fitting the new window into our office room. we are very pleased with the end result and would recommend your services again
I can’t praise the work carried out on my property. It transformed a very tired and scruffy frontage to a very modern looking property. The work was carried out on time by professionals who were very helpful. When completed all rubbish was removed and the surrounding area swept and cleaned. I have had several compliments from family and neighbours.
I recently had a window looking out into the garden converted into an external door with Greenoak Concept and Design. The customer service I found to be excellent throughout the process and the installation was incredibly professional with a great final product, finished to a high standard. Would happily and already have recommended this company.
I walked in to the showroom in January and was immediately helped by Dale. Information was supported by documents I could take away and peruse and questions answered on subsequent visits. There was no pressure to sign up and I appreciated Dales honesty and business values. The procedure from start to finish was clearly outlined and ran like clockwork. My conservatory roof was replaced to plan and the interaction of the team working together was exceptional. I have already benefited from the changes with this recent heatwave! So much cooler and to have additional space that is usable all year can only be a bonus and add value to my property. Its a technical and involved process, and the guarantees standing behind the completed product are reassuring. I cannot recommend Greenoak and their team highly enough (in fact my neighbours have already signed up on my recommendation!!)
I recently had new windows, a front door, and Hardie Plank cladding installed by Greenoak Concept & Design. From the outset, communication was clear and professional, and the whole process felt well-organised and stress-free. A big shout-out to Ed and Stewart, the team who carried out the work—they were not only skilled and efficient, but also incredibly polite, friendly, and considerate throughout. They took great care to ensure everything was completed to a high standard, and I really appreciated their patience and understanding whenever I had questions or needed time to make decisions. Greenoak weren’t the cheapest quote I received, but I believe the quality of service and workmanship absolutely justified the price—plus, I was given a fair discount for having all the work done together. Highly recommend if you're looking for a reliable company that genuinely cares about doing a great job!
We recently have had a new super lite roof completed on our conservatory after it being a room we couldn’t use as was either too hot or too cold. It is amazing. The difference it has made is unbelievable. The team at Greenoaks were all so efficient, punctual and hardworking. We couldn’t find fault in the service and work carried out and would highly recommend them to anyone.
We approached Greenoaks for their help in fully cladding our bungalow, from the very start Dale eased all of our concerns regarding the project. All of the reviews we had previously read were 5 star, so we were confident we had chosen the best company. Dale and his office team along with Stu and Ed our installers fully matched up to all the outstanding reviews, and we are exceptionally pleased with the finished work. They were professional and knowledgeable throughout the process and we would not hesitate to recommend this company for any home improvement you may have.
We had Greenoak Concept & Design carry out installation of Hardie Plank cladding to the front of our house and the renewal of our front door recently. From the initial visit right through to the completion of the work, Dale and his team were fantastic. They told us exactly what was going to happen, and when. Everything ran as Dale advised. Communication is key work like this and Greenoak were exemplary. As well as Dale, Mark their surveyor and the fitters Ed and Stu all did fantastic jobs. We are so pleased with the finished works. We would definitely recommend.
Really happy with the service from Greenoaks and great value for money. Wonderful communication and the quality of work. They installed three windows and a door to the garage.
Greenoak replaced some old timber cladding for us on the top part of the house and dormer windows with HardiePlank. They didn't try and push us into anything we didn't want, and did a great job. The work is fantastic, and the people were friendly and professional. I'm sure it's possible to find cheaper work if you want cowboys and squeaky plastic cladding, but we'd rather have someone who knows what they are doing.
Highly professional company. Contractors arrived on time, great workmanship, and left the site perfectly clean on leaving. From placing order to completion, amazing - well done !
We had our conservatory roof removed and a tiled roof added. The whole job was done very professionally. All trades persons arrived when they were supposed to and were very clean.Highly recommend this company
Very professional, very high standard of work. Really please from the first meeting to the final sign off of the extension. Would highly recommend.
If any company deserves a 5 star review it’s Greenoaks, from the first visit from Dale, to the installation of our fascias and soffits and the fantastic silicon render job done by Dave, Ray and Harry. Everyone at Greenoaks should be proud of what they do and I highly recommend this company to anyone looking to transform their home.
So pleased with our new front & back doors. Excellent communication throughout the whole process of design, survey and installation. Cannot recommend enough 👍👍
Good original consultation with Dale, general advice without being pushy. Survey efficient and quote broken down and understandable. Very good team from Greenoak, work done as per schedule, clean and tidy. Very considerate when one of us was unwell, kept the noise down. Problem with garage door investigated and rectified very quickly. Really pleased with final result, completely transformed external appearance of house. Thanks to whole team inc Tom Jay Mike Dave Callum Ed and esp Mark and Tegan.
Amazing service from start to finish. Wouldn't go anywhere else, highly recommend to anyone.
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Greenoak Concept & Design have been raising the standards for more than 14 years.
More about us: We’re an independent Essex-based specialists in high quality UPVC Windows, Doors, Tiled Conservatory Roofing, Wall Cladding, and Fascias, Soffits and Guttering.


















