Slim Frame Windows – Exclusive to Sheerwater Glass

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 which also looks the part.

Combining the performance of casement windows with spectacular design, our Slimline range has a low proportion of frame to glass which allows up to 12% more glass. This results in a sleek and impressive window, which is ideal for both modern and traditional properties that allows light to flood into your home. Use our interactive window display to explore the benefits of our slimline windows.

To learn what you should be looking for when sourcing your next set of windows, download our Slimline windows brochure. From what energy ratings are, to how you can personalise your new windows, this brochure has all information about our Slimline windows!

Download Slimline Brochure

Our friendly team are available to answer any queries you have. Call us today on 01932 344 415 visit our contact page or get a free online quote today!

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Slimline White Inside

Top Grade uPVC

The highest category (CAT A) outside wall thickness is 2.8mm – our Slimline system is 3mm.

Weather Resistant

Entirely drought proof and watertight, the purposely built drainage system further enhances its weather resistance.

Bespoke Frames

The Slimline window frames are tailored to you. You will have a selection of colours, finishes and woodgrain foils to choose from.

Thermal Enhancement

With a multi-chambered system, our Slimline windows are manufactured for increased thermal efficiency.

Custom Handles

You will have a choice of elegant window handles for an espagnolette window lock, available in an array of colours.

Easy Operation

Our Slimline windows can open to a 90º angle (conforming to the current British Standards & FENSA requirements), and provides thumb catches; which allow you to open and close the window easily.

Slender Design

With a lower proportion of frame to glass, our Slimline windows eliminate bulkiness and welcome more light into your home.

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    Bespoke Design

    Tailor your new Slimline windows to create a flawless and contemporary look. Our exclusive Slimline windows are available in a range of colours to suit any property, whether it’s modern or traditional.

    We currently offer our slimline windows in a casement style.

  • energy

    Energy Efficiency

    Our Slimline windows were awarded with a Window Rating” (WER) of A+. This impressive energy rating ensures that your home stays warm & dry and helps cut the cost of your household bills.

    Our range has also been tested by BFRC and has been awarded an energy rating of +11.

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    Exclusive Range

    You won’t find our Slimline uPVC Windows anywhere else in the UK!

    Our friendly team are just a phone call away to help you find the perfect Slimline window solution for your home, contact us today!

Tailored Slimline Windows to fit your home

Our team of experts are available to help you design and install a bespoke window that looks great and effortlessly complements your home. The opportunity to tailor your windows to suit your home has never been easier than it is with our exclusive Slimline range which is available in a range of colours and materials.

The design and installation of your Slimline window is always carried out by qualified members of our team – they guarantee years of experience and a willingness to provide you with the perfect window design and fitting.

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.

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.


Security is of great importance to you, your home and your family, and you can be confident that our Slimline products offer maximum security.

Our Slimline Windows are fitted with:

  • A Shootbolt locking system, which utilises a Shootbolt Espagnolette gearbox that is manufactured from ferritic stainless steel.
  • Security glazing to prevent the removal of the glass units.
  • Hinge protection to improve anti-thrust (anti-jemmy) protection.
mila lock 2

Design Your Slimline Windows Here:

  • Agate Grey

    Agate Grey

  • AnTeak


  • Anthracite Grey

    Anthracite Grey

  • Basalt Grey

    Basalt Grey

  • Black Brown

    Black Brown

  • Brilliant Blue

    Brilliant Blue

  • Chartwell Green

    Chartwell Green

  • Cream


  • Dark Green

    Dark Green

  • Dark Red

    Dark Red

  • Golden Oak

    Golden Oak

  • Hazey Grey

    Haze Grey

  • Irish Oak

    Irish Oak

  • Light Oak

    Light Oak

  • Mahogany


  • Natural Oak

    Natural Oak

  • Rosewood


  • Signal Grey

    Signal Grey

  • Slate Grey

    Slate Grey

  • Slate Grey Finesse

    Slate Grey Finesse

  • Steel Blue

    Steel Blue

  • Sienna


  • Swamp Oak

    Swamp Oak

  • Walnut


  • White

  • White Woodgrain

3 Aperture Slimline Agate Grey
AnTeak copy
3 Aperture Slimline Anthracite Grey (RAL 7016)
3 Aperture Slimline Basalt Grey
3 Aperture Slimline Black Brown
3 Aperture Slimline Brilliant Blue
3 Aperture Slimline Chartwell Green
3 Aperture Slimline Cream
3 Aperture Slimline Dark Green
3 Aperture Slimline Dark Red
3 Aperture Slimline Golden Oak
3 Aperture Slimline Haze Grey
3 Aperture Slimline Irish Oak
light oak
3 Aperture Slimline Mahogany
natural oak
3 Aperture Slimline Rosewood
3 Aperture Slimline Signal Grey
3 Aperture Slimline Slate Grey
slate grey finesse
3 Aperture Slimline Steel Blue
sienna copy 1
swampoak 1
walnut copy
white window

Get a quote or find out more about our range of Slimline Windows

Contact our team today or get a quote using the links below.

Get a Free Quote