Slimline Stormproof Casement uPVC Windows

Our exclusive Slimline uPVC Windows

The perfect compliment to any style home

Our Slimline uPVC Window is available in a wide range of designs to suit every style and period of property. Slimline Windows are one of the most popular uPVC products we have to offer.

Our Slimline Stormproof Casement uPVC Window combines excellent functionality with a wide range of quality styles and colours. Slimline Windows from Sheerwater Glass are guaranteed to compliment your home.

The lower proportion of frame to glass results in an extremely slender window. By increasing the area of glass in the window, up to 12% more glass can be achieved over many other leading brands of uPVC windows. This allows light to flood into your home.

If you unsure what type of Windows would be right for your property, our friendly team can help. You can email us, call us on 01932 344 415 or contact us via the contact page.


  • Excellent functionality
  • Wide range of quality styles and colours
  • The perfect fit for any style property

Fensa Registered Company

FENSA is an acronym for the ‘Fenestration Self-Assessment Scheme’. Set up by the Glass and Glazing Federation, it allows double glazing companies to self-certify compliance with Building Regulations. There are several reasons why you should check for the FENSA logo when looking to have new windows and doors fitted in your home.

BSI Kitemark - Window Installation

Sheerwater Glass is one of only a handful of companies that has achieved the industry’s highest standard, BS 8213 for the survey and installation of windows and external door sets.

QA National Warranties

The insurance intermediary company QANW is responsible for protecting consumers through insurance policies. QANW has been in the business for over 25 years and has formed close associations with various building contractors and trade associations throughout the UK.

City & Guilds - Level 3 Qualified

The educational organisation City & Guilds are known for their vast levels of assessment, offering employees and workforces with the skills they require for many years. This seal of approval provided through their accreditation gives customers the confidence they require. Two of our employees, one in management and the other in our service department are qualified to City & Guilds level 3. This level of accreditation is highly sought after, with City & Guilds working with some of the leading brands of various sectors to offer the highest standard of training. The accreditation offered by City & Guilds is valued significantly, showcasing a business’s expertise, dedication and knowledge. In achieving this level of qualification, customers can feel assured that they are receiving the highest standard of work and customer service. City & Guilds and the City & Guilds logo are trademarks of the City and Guilds of London Institute and used under licence.

Checkatrade - Proud Members

Finding a tradesman is not always an easy task, especially when you’re unsure whether he or she is trustworthy. After all, you’ll be inviting this person into your private home, so you need make sure that they are reliable.

GQA Qualified

GQA Qualifications is an Awarding Organisation for specialist sectors and occupational roles. Qualifications cover the Glass, Construction, Coating and Print industries.

PASMA Tower Trained

Our team are fully trained in the assembling, dismantling, moving and inspecting mobile access towers and working at height.

BFRC Rated

Our products are BFRC rated, an independent verification of the energy efficiency of our windows and doors. BFRC rated energy efficient windows and energy efficient doors carry a ‘rainbow’ label.

  • energy-efficient

    Energy Efficiency

    Proudly awarded an energy Index rating of A+, the Sheerwater Glass slimline stormproof casement uPVC window is amazingly efficient in comparison to other leading brands. By improving your home’s energy efficiency our slimline windows ensure your home stays warm, dry and secure. Not only does their slender frame compliment any style property, but their impressive energy efficiency will help cut the cost of your household bills too.

  • Security

    Security

    Rest safe in the knowledge that your home and family are safe with Trojan multi-point, shootbolt locking mechanisms fitted in our Slimline windows. We don’t believe in cutting corners, which is why we source and install only the highest quality products and materials that we believe are built to last. Using the latest innovative window technology, our Slimline stormproof casement uPVC windows are guaranteed to continue to perform well for years to come. 

  • custom design

    Colour and Finish

    Available in a vast range of colours, our Slimline stormproof casement uPVC windows are a flawless addition to any style property. We understand that every home is unique, which is why our team of expert window designers are on hand to help you find the perfect window solution to suit your design preferences and budget. Our incredible slimline windows have a low proportion of frame to glass, resulting in up to 12% more glass for a better view and greater light.  

  • EXCLUSIVE

    Exclusive to SWG

    You won’t find our Slimline UPVC Windows anywhere else. With an outstanding finish, variety of colours, fantastic security and energy efficiency, they are unparalleled. Get in touch with our friendly team today for a free no-obligation quote! We look forward to getting your project underway.

Browse our range by material or by style...

We have a wide variety of colours available to choose from.


Available Colours

  • Agate Grey
    Agate Grey
  • AnTeak
    Anteak
  • Anthracite Grey
    Anthracite Grey
  • Basalt Grey
    Basalt Grey
  • Black Brown
    Black Brown
  • Brilliant Blue
    Brilliant Blue
  • Chartwell Green
    Chartwell Green
  • Cream
    Cream
  • Dark Green
    Dark Green
  • Dark Oak
    Dark Oak
  • Dark Red
    Dark Red
  • Golden Oak
    Golden Oak
  • Hazey Grey
    Hazey Grey
  • Irish Oak
    Irish Oak
  • Light Oak
    Light Oak
  • Mahogany
    Mahogany
  • Natural Oak
    Natural Oak
  • Rosewood
    Rosewood
  • Rustic Oak
    Rustic Oak
  • Sienna
    Sienna
  • Signal Grey
    Signal Grey
  • Slate Grey
    Slate Grey
  • Slate Grey Finesse
    Slate Grey Finesse
  • Steel Blue
    Steel Blue
  • Walnut
    Walnut
  • Swamp Oak
    Swamp Oak
  • White
    White
Click to view additional information

Technical details of our Slimline uPVC Casement Windows

  • With windows accounting for up to 30% of total heat loss and ever increasing energy fuel costs, it is important for you to choose an energy-efficient double glazed window.
  • The minimum “Window Energy Rating” (WER) required of all windows, in accordance with current legislation, at this time is a ‘C’. All professional window installers should be complying with this requirement at the very least.
  • The minimum “Window Energy Rating” (WER) required of all windows, in accordance with current legislation, at this time is a ‘C’. All professional window installers should be complying with this requirement at the very least. However, unbeknown to many people, it is a fact that each WER rating (A, B & C) has varying degrees of standards. These variances are highlighted by testing authorities providing tested windows with an Energy Index. The higher the Energy Index number, the more efficient the window is at retaining generated heat.
  • The Sheerwater Glass Slimline Window has undergone vigorous testing by ‘BFRC’. They have awarded our window with an Energy Index of +11, which proves how energy efficient the Sheerwater Glass Slimline Window is in comparison to other leading brands.
  • Security is of great importance to you, your home and your family. So rest assured in the knowledge that Sheerwater Glass Slimline Windows are fitted with Trojan multi-point, shootbolt locking mechanisms. We are very proud to announce that this locking mechanism has achieved a BS7950 status.
  • Our Slimline Windows are also fitted with security glazing to prevent the intact removal of glass units, along with hinge protection, as standard features of the product. Nothing is impregnable but our Slimline Window has foiled all attempts of forced entry (excluding the breakage of glass) that we are aware of to date.
Get a Free Quote