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Europe’s No. 1 window brand-87 years Established

From the birth of the UPVC window to the production of timber/aluminium windows and to the high-tech and high-design innovations nowadays, Internorm windows is setting standards Europe-wide. Continuous technological further development and continual new innovations make Internorm pioneer in the brand.

High-quality windows and doors from Austria

Internorm windows UK products stand for excellent quality, innovative technologies and market leading thermal performance. As an Austrian business Internorm are continuously setting new standards in the window and door market.

Internorm’s range of products includes; windows, front doors, patio doors, sliding doors and back doors, all available in 4 different design styles.

Internorm’s strengths

  • Leading expertise in highly thermally insulating window systems for passive houses
  • Pioneer in UPVC windows
  • Total window system concept
  • Leaders in innovative technologies
  • Security of an internationally leading market brand

Internorm by Cherwell

Internorm by Cherwell is proud to have been awarded an Internorm 1st Window Partner. Our range includes the best performing thermally efficient windows on the market that are beautifully made and engineered to your specifications. Each product is available in a choice of three materials; timber/aluminium, uPVC aluminium and uPVC, allowing you to customise your windows to your home.

Find out more about what it means to be an Internorm 1st Window Partner

Internorm windows also benefits from the following key features:

  • Passive House
  • Triple glazing
  • Thermally broken windows
  • Integrated blinds – controlled via remote and iPad.
  • Noise Reduction
  • In-frame ventilation systems providing you with a climate controlled system whatever the weather.

PassivHaus or Passive House

A passive house provides consistent, comfortable temperatures throughout the year, without using conventional heating or air conditioning systems. Using the existing temperature provided via solar radiation through the windows as well as the heat from appliances and inhabitants is sufficient.

The required heating energy for a passive house is only 10% of that needed for a conventional house. These extraordinary savings are rooted in the two basic principles of minimising thermal loss and optimising thermal gain.

For further information, see our page – What is a Passive House? 

Importance of PassivHaus windows

The window in a passive house plays a prominent role in two ways – firstly, the heat loss despite large glass surfaces can be reduced and secondly, windows increase the possibility for heat gain through solar energy. Internorm‘s highly thermally insulated windows do this exceptionally well: thermal insulation glazing as used in passive houses achieves Ug values of up to 0.4 W/m2K.

  • Essential principles for the construction of passive house windows:
  • Highly thermally insulated glazing
  • Highly thermally insulated frame
  • Thermally optimised edge seal


For over eight decades, Internorm have gained a reputation for their iconic design and their products ability to integrate with almost any architectural styles, whether it be classic, contemporary or minimalistic.

Though their Studio, Home Pure, Home Soft and Ambiente ranges, Internorm’s windows offer both frameless and classic styles. When combined with their premium materials, including timber, aluminium and UPVC, this leaves you with a solution that matches you and your home perfectly.

Your ability to get a truly bespoke window does not end there, however. Internorm also offer many different styles of handles. What’s more, Cherwell and Internorm have come together to also offer a vast array of colour options for both the inside and outside view of your Internorm windows.

We invite you to visit one our showrooms, to see and feel the product for yourself. They are located in;

  • Banbury, Oxfordshire. Easily accessible for Oxford, Northampton, Milton Keynes, Brackley, Towcester, Bicester, Thame, Kidlington, Witney, The Cotswolds, Chipping Norton
  • Henley-on-Thames, Oxfordshire. Easily accessible for Maidenhead, Reading, Marlow, Shiplake, Sonning Common, Sonning Eye
  • Beaconsfield, Buckinghamshire. Easily accessible for High Wycombe, Chalfont St Giles, Chalfont St Peter, Gerrards Cross, Amersham, Great Missenden

Contact us using the make an enquiry button and we will be in touch shortly or call 01295 270938 to speak with a member of our team.

Click here for further information on the Internorm brand.


Through their innovative I-tec glazing, Internorm windows offer maximum thermal and noise insulation throughout the year. When combined with all round fitted glass panes, which leave as fewer gapes as possible between your glazing and window frames, you can be assured of a warm and efficient home wherever you live.

Internorm’s aluminium and UPVC windows also feature I-tec insulation, which introduces granular insulation to the chambers throughout the window frames to offer gapless insulation. This helps towards stopping any unnecessary loss of heat through the metal frame of your windows.

Visit the I-tec page


To keep your family and home secure, Internorm have integrated patented I-tec locking technology into each of their aluminium and UPVC windows. Through this technology, you can enjoy RC2 level security that is almost entirely integrated within your frame, making it easy to clean and considerably sturdier.

When combined with their I-tec core, which uses several high-quality timber layers to offer a sturdy and resilient frame, your property is in safe hands with Internorm. Lastly, their I-tec glazing’s fix-o-round technology ensures no spaces exist between the glass pane and window frames.

Visit the I-tec page

Smart Technology and Shading

With patented I-tec SmartWindows integrated into your windows, you can indulge in the most technologically advanced windows available on the market today through Internorm’s free smartphone and tablet application.

I-tec SmartWindows work with your newly installed windows to allow for convenient opening and closing of individual windows throughout your home. Should your windows feature Internom’s I-tec shading, which uses a self-sufficient built in motor, you can use the I-tec SmartWindows to open your blinds or automate them through the detection of daylight.

Visit the I-tec page