Stunning and versatile range
Replacement Doors Essex

Create the perfect entrance to your home, with our stunning and versatile range of doors.

We’re proud to showcase a wide range of styles and colours that will suit both your home and your needs – whether you’re looking for increased security, improved energy-efficiency, or a simple injection of elegance.

Whether you want a stylish new composite front door or a new entrance to your garden via bi-folding door, we have the right door for you! Our low maintenance uPVC doors offer the latest in energy efficiency technology and achieve Secured by Design security accreditation.

From entrance doors to cottage doors; patio doors to French doors; the choices may seem endless but our complete end-to-end service has been designed to help you achieve the exact results you are looking for.

Our experienced team will work with you to understand your needs and the look you’re aspiring to before guiding you through the available options at our showroom in Westcliff-on-Sea, Essex. We will take you through the many factors to base your decision on – style, performance, energy-efficiency, security, value-for-money – and answer any questions you may have.

Once you have made your choice, Greenoak Concept & Design Ltd provides a full delivery and installation service – and we’ll protect your new composite doors under our 10-year guarantee.

Door Co & Rockdoor Composite Doors

The woodgrain finish, GRP composite door is developed from oak tree grain, creating a beautifully authentic appearance and superior performance. Plus, thanks to its rigid polymer subframe, high density or timber insulated core, high impact resistant GRP skin, in our range of composite doors have exceptional durability.

What’s more the UK’s favourite entrance doors comes with a 10-year warranty and is available in over a variety of different styles, colours and glass designs.

When it comes to thermally efficient doors, a Door Co and Rockdoor composite doors are the best choice you can make.

With a weighted noise reduction of 31 decibels, it means you can be sure your new door will keep outside noise to a minimum, helping to make your home the haven you want it to be.

Everything about a Greenoak Concept & Design composite door choice is designed to be easy to maintain, including the triple glazed insulated glass unit which encapsulates the decorative glazing between two panes of clear glass, protecting it and making it easy to keep clean.

Water resistant polymer composite rails that protect its core. This means it won’t suffer from water absorption which can lead to skin de-lamination. Your door will keep the weather at bay and stay looking good for longer.

So, when making your choice of new composite Door Greenoak Concept & Design has all your needs covered.


Rockdoor Composite Door is a combination of traditional looks and unique manufacturing techniques. Our doors are available in a range of standard colour and woodgrain finishes, but with our state-of-the-art paint plant, we can now provide a wide range of specialist colours and a colour matching service. Rockdoor composite door are also the most robust doors on the market, with their inner frame aluminium box section for added strength and their unique steel security mesh giving all customers the added protection from intruders who wish to cut through the door slab.

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Rockdoor traditional door range is designed with aesthetics in mind, with 12 styles to choose from this is one of our most popular ranges. Of the traditional styles Jacobean and Lllinois are unique to Rockdoor, whilst the Newark and English Cottage styles are aesthetically superior to other composite door suppliers. Again, all Rockdoor composite door are also the most robust doors on the market, with their inner frame aluminium box section for added strength and their unique steel security mesh giving all customers the added protection from intruders who wish to cut through the door slab.

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Door Stop Modern Composite Door range is a combination of traditional looks and advanced manufacturing techniques. All doors are available in a range of standard colour and woodgrain finishes. View website here:

Door Stop traditional door range is designed with aesthetics in mind, with 13 styles to choose from making this is one of our most popular ranges. Of the traditional styles from Diamond Cottage to our 4 Square design, whilst the Curve for the more adventures and the Cottage Long are becoming the most sort after door in the market and to Greenoak Concept & Design.

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Finding the right door

We understand how important finding the right door can be. Much more than simply a method of transitioning in and out of the home, doors have been known to greatly contribute to a property’s overall character and aesthetic, reflecting on your own. To accommodate these factors, doors from our range allow for a great deal of customisation and design flexibility, always offering some of the very best thermal retention, protection, and style possible.

The Greenoak Concept & Design Installations team actively work with some of the best systems companies and industry innovators to guarantee an impressive finished result every time. These include household names like Door stop, Rockdoor and Smarts, each offering their own unique benefits which when combined with our quality installation techniques, results in an entranceway that stands the test of time.

We are proud that our GRP composite doors meet or exceed regulatory requirements.

What is a
composite door?

A composite door is made up of a combination of materials. This means it can improve on the performance of standard uPVC and timber doors. With a rigid polymer frame and insulating foam core, the multi-layers provide barriers against the cold and severe weather. As well as their unique interior, their exterior also makes them stand out. Doors have a woodgrain effect GRP (glass reinforced plastic) skin that’s damage and impact resistant. This lets them fit in perfectly in traditional as well as modern homes.

Benefits of a composite door

The aesthetic appeal is what first draws people to composite doors. Your front door is often one of the first elements of your home a guest will see. It’s important that it impresses, and composite doors certainly do that. With a resistant GRP skin, the colour will never fade. These doors have the timber look with modern performance. Fine detailing adds to the authentic look.

The thermal performance of our composite doors is second to none. With a highly insulating core, your home will no longer suffer from cold spots or draughts. Whatever the weather’s doing outside, you’ll be comfortable inside with A energy rating’s achievable. This will lower your energy bills and the superb insulation will keep unwanted sound out too. Our supply of composite doors is 17% more efficient than other solid timber core composites and timber panelled doors.

With secure locks and a strong and thick door, your home is protected. Security is always a key consideration and our composite doors are both secured by design and PAS24 accredited.

These doors are extremely durable and rigid so provide more than enough protection against intrusion, the elements as well as regular wear and tear.

Composite doors don’t need repainting and the GRP skin keeps it protected against bumps and scratches. This durability will ensure that your new door stays looking good for years to come.
Style is prioritised as much as performance with our composite doors, so they will always make sure your home stands out for the right reasons.
With a beautiful range of colours including Turquoise Blue and Ruby Red, make your door perfectly fit your home and style. You can still enjoy glazed sections which will fill your home with light and thermal glass ensures the cold can’t come in.
With a 25-year structural warranty and 10-year surface warranty, Distinction composite doors will protect your home and look pristine for many years beyond this. No wrapping, no gaps, and no Manufactures trying to get out of faulty doors after they have wrapped with tolerance levels. Our are doors you can rely on.

Door Designer

Create your perfect door in just a few clicks!
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UPVC Patio Doors

Like all Deceuninck products, this patio door comes with all the latest design features as standard.

Manufactured from sculptured, ultra slim profiles, you’re guaranteed to generate the maximum amount of natural light.

‘Crash’ stops are hidden into the operating mechanism, and a bespoke wrap over threshold prevents scuff marks from day to day use. The appearance of a Patio Plus sliding door will be just as good years later.

With the new Patio Plus making a real impact on keeping energy usage down, and being a 100% lead free PVCu extrusion, it is very much an environmentally friendly product. All elements of the door are designed to be easily re-cycled at the end of their lifetime.

Smart Bi-Folding Doors:

These doors add a new dimension to any room, sliding smoothly and folding effortlessly to allow the outdoors in.

A mixture of hinged and folding doors enables you to design the door to suit individual requirements. The choice is from two to seven panes, open in or open out, with left or right sliding options.

You can also choose to have a hinged swing door, or a slide only format – 36 different opening configurations are available, so there’s sure to be a solution to every situation.

White Framed Bi-Folding Doors

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Based on 56 Reviews

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.

Kitty Heyns

Amazing service from start to finish. Wouldn't go anywhere else, highly recommend to anyone.

Danny Clark

5 * very helpful and professional great service 👍 👏 👌 highly recommended.

Roman Clark

This my second time using Greenoaks Conecept and design , I cannot vouch for them enough ! Dale and the team completed a very a high standard of work throughout on a few properties for me and would highly recommend to anyone looking .


Dale and his team are amazing! I will use them again!

Mary Dean

Highly recommend this company. Had our conservatory roof done and they did a fantastic job. They kept us informed every step of the way of what would be happening. Cleaned up at the end of each day and was very hardworking, polite and friendly.

Dale has been a star. From his first visit to give me a price, to completion of the works. Punctuality and communication of the Greenoak team (Dave/Ray/Callum) was excellent.I am so pleased with the job that Green Oak have completed for me. They were professional, tidy and worked so hard. The job is finished to a high standard and I will 100% use them again. Would highly recommend.

Maria Howe

Job was done in the hours I was told. Very efficient and happy with my new conservatory roof. Thank you and would happily recommend Greenoak

alan shinn

We recently had relacement windows and doors by Greenoak Concept. Many thanks to Dale and all the team,they are very professional, punctual, polite and leave the job in a clean and tidy condition. Very pleased with the outcome, many thanks to all at Greenoak.

Dale and the Greenoak team are fantastic; having delivered 2 large projects on our house, both on-time and on-budget (and with a laugh & smile!) we can’t recommend them enough! Thank you!

Professional job.

Nick Brennan

So far very happy with the installation . Our tired old conservatory has been totally transformed by the team at Greenoaks. They worked cleanly and efficiently whilst navigating our day today running if the house. We’re actually looking forward to the heat of summer and cold of winter!!

Dale, you and your team, thank you so much for your time and dedication. Our new composite Rock door looks and feels fantastic. It feels really good using a local company that cares about their customer from start to finish. Thank you

We have had a solid roof put on our conservatory by Green Oak. We were very impressed from the outset. Dale took time to explain every aspect of the build bringing a model of the roof so we could see the construction. Then he left us think about it and there was no hard sell. The workmen were very pleasant, friendly and worked extremely hard. Despite being one man down the other chap worked late into the evening to make sure the construction was finished on time ( rather than have to come back for a couple of hours the following day), as did the man doing the plaster boarding. Every evening the site was left tidy and all rubbish taken away once the work was finished. The plasterer and electrician also did a brilliant job and all works was finished on time. We are really happy with the end result and couldn’t recommend the firm more highly. John & Rita Dobinson

Nicky Boosey

Dale was very professional in giving us sound advice and explained the whole process from start to finish. The job commenced on time, Mike and Mark treated our home with respect and were very knowledgeable and kept us informed all the way along. The quality of work is excellent and we would recommend them.

Ian Creek

We needed 11 new windows of various sizes so we spent some time searching reviews for a highly rated but local Double Glazing window installer. Greenoak came out top of our search results, We reached out and Dale responded quickly followed by a visit a few days after. The resultant quote was very competitive versus other quotes we had received. It was an easy decision to go with Greenoak. Dale came across as very knowledgeable, friendly and genuinely customer focussed. He invited us to the showroom in Leigh where he took us through the detail to ensure we were fully aligned on requirements and expectations. We were very impressed with him and his business and by his overall professionalism. The installation took place on 20th Feb 2023 and took 4 days in total. The whole process was exemplary, we could not fault the team in any way. They were tidy, considerate and very thorough. We have had windows fitted before by various other company's but the quality of fit and finish from the Greenoak fitters was far superior. The guys worked solidly and clearly did not skimp on anything, ensuring that the windows were not only properly fitted but sealed professionally too. They did an outstanding job including clearing all of the old windows and rubbish Overall we'd rate Greenoak at 10/10. We felt reassured by their high standards of work ethics, integrity and customer satisfaction. We honestly doubt there is anyone better out there for this type of work. We therefore wholeheartedly recommend them Ian and Jenny

Fantastic job done by Greenoak, the guys were professional, friendly and a pleasure to have in my home. I couldn’t be happier with the job they did. Highly recommended.

Brilliant company, very friendly and easy to work with. Very pleased with the finished cladding on our office wall - excellent quality and good value


Replacement Conservatory Roof. Fantastic company and service from the whole team! Dale is great and gave me a quote for my new lightweight roof, great bloke and not pushy, loved the fact he gave a all in price rather than start low and add extras. The fitting team are fantastic!, Mike, Mark and Casper treated my home like their own, , great attention to detail and did everything I asked to get the perfect finish, I honestly cant find 1 fault and I am fussy! I could not be more happier with my roof!! Take my advice, Don't look anywhere else ,I cant rate them highly enough. Greenoak are the BEST!

Following our initial discussions with Dale, our expectations were already set high when it came around to installation. Some truly awful weather right at the start of the installation virtually wiped out the first two days work, and the anticipated seven day build seemed to be in jeopardy right from the start. But Mike and his crew - supplemented by two and sometimes three others, working in still inclement weather, brought the build back on schedule by the end of day five, and the plastering and electrical second fix over days six and seven meant the whole project was delivered to time, and budget meaning that our initial high expectations had even been exceeded. I have nothing but the highest regard for their workmanship and scheduling - and not forgetting Dione in the office who kept me informed throughout and efficiently managed the stage payments. In my experience it is unusual to receive a great sales pitch and then to have that exceeded by the installation teams - I couldn't recommend Greenoak's services more highly.

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Greenoak Concept & Design have been raising the standards for more than 10 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.


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