• Windows


    See our full range of attractive uPVC windows in Southend-On-Sea with high energy efficiency ratings and excellent Yale security locks to suit any property in Essex.

  • Doors


    Discover our fantastic range of uPVC, aluminium, timber and composite doors available for your home in Essex. High security as standard for your peace of mind.

  • Conservatories


    Increase your living space with a beautiful uPVC conservatory from Altex in Southend-on-Sea. Extend your home and enjoy plenty of natural sunlight and fresh air.

  • Aluminium windows and doors Southend-On-Sea


    Altex supply and install high quality, energy efficient, and durable aluminium products, from sleek and stylish aluminium windows to highly versatile aluminium bi-fold doors.

We Manufacture, Survey and Install Aluminium Windows and Doors


Double Glazing Southend-On-Sea, Essex

Altex are suppliers and installers of bespoke windows, doors and conservatories. Having been established for over 25 years, we have built an exceptional reputation in the South East, including Essex and the surrounding areas.

  • We pride ourselves on being professional, honest and offering high quality work in the region. We offer a wide range of superior quality, A+ rated uPVC double glazing from Liniar as well as aluminium manufactured by Schuco and Smart Systems and timber windows and doors.

    We are Certass and FENSA registered and all of our products are CE marked, ensuring the very highest level of service, safety and security for your new installation. All of our double glazing installations come with a 10 year insurance backed guarantee, because we know how important peace of mind is for our customers. Find your free and instant quotation today by using our online quoting engine and see why over 80% of all our work comes through recommendations from satisfied customers.

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  • The Perfect uPVC Profile

    The Perfect Profile

    Liniar have designed the perfect uPVC profile which is why we are confident you will love your new installation by Altex. It offers superior design features and a technically advanced uPVC window system that is unrivalled by any competitor.

    What Makes Our uPVC So Special?

    There are six key features that make a Liniar profile stand out from the crowd. Flipper gaskets are in place to effectively reduce the amount of cold and damp entering your property. Each profile has six-chambers in order to lock in additional pockets of warm air. Double action ‘bubble’ gaskets make sure each window and door in Essex is tightly weather sealed. The uPVC material used is particularly rigid in order to cut out the use of steel reinforcements.

    Hand Finished uPVC Products

    All our Liniar products are lovingly crafted and finished by hand to ensure complete perfection in every order. There are four steps to the hand finishing process.

    1. Using precision chisels for a completely smooth finish, all the corner contours are meticulously checked for appearance and detail.
    2. Using engineered contour blocks the outside edges can be levelled at the corners which create a beautifully square silhouette when hung.
    3. For exactitude and uniformity every corner groove is looked over to ensure an even depth is in place which can be manually deepened if found too shallow.
    4. All apertures are examined for weld build-up in the corners and carefully removed to guarantee a tight weather seal.


    lead-freeA Liniar uPVC profile is exceptionally environmentally friendly and highly energy efficient. You will be contributing to a greener environment by simply having beautiful new uPVC double glazing in Essex installed. Fully committed to recycling, our uPVC windows, doors and conservatories are all extremely strong and therefore do not need any steel reinforcements, making them 100% recyclable and much better for the environment.

    There are many dangers to using lead products so you’ll be please to know all of our uPVC double glazing in Southend-On-Sea is 100% lead free, something many of our competitors are not. Reducing your Carbon Footprint can also be achieved throughout your property with the installation of our stunning double glazed products. Visibly notice the reduction in your fuel costs and CO2 emissions almost instantly after your new windows are in place.