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Internorm Windows

– Europe’s No. 1 window brand – Established since 1931


From the birth of the UPVC window to the production of timber/aluminium windows and to the high-tech and high-end design innovations nowadays, Internorm windows have been setting standards Europe-wide. Continuous technological developments and new innovations make them the pioneer in the high performance windows and doors sector.

Austria’s premier high-performance windows and doors

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

Cherwell have been awarded 1st Window Partner Gold status

Internorm’s high-performance range of windows are available in 4 different design styles:

Timber/Aluminium or uPVC/Aluminium – the choice is yours

Timber windows bring a warmth to any home. They are natural and cosy. Cladding the outside with aluminium protects them from weathering. Special foam situated between the timber and aluminium additionally ensures perfect thermal insulation and excellent U-values.

Our HF210, HF310 and HV350 windows are available in spruce, whereas our HF410 window is available in larch, oak, ash and walnut, allowing you to choose different colours.

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Internorm Windows 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

  • Can be made Smart Home ready

Internorm by Cherwell

We are proud to have been awarded 1st Window Partner Gold status. 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 how Internorm by Cherwell achieved 1st Window Partner status

High performance windows key features:

  • Passive House certified
  • 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.

Iconic Design

For over eight decades, Internorm has gained a reputation for their iconic design. Their products can integrate with almost any architectural styles; classic, contemporary or minimalistic.

Through their Studio, Home Pure, Home Soft and Ambiente styles, Internorm windows offer both frameless and classic options. When combined with their premium materials of 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. There are many different handles and a vast array of colour options on offer for both the inside and outside view of your windows.

Smart Home

Our Internorm window products can also be made Smart Home ready. If you are thinking about your new build, consider how you can integrate Smart Home technology into your windows, doors and light solutions.


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

  • Banbury, Oxfordshire. Easily accessible throughout Oxfordshire, Warwickshire, Northamptonshire and Buckinghamshire
  • Beaconsfield, Buckinghamshire. Easily accessible for throughout Oxfordshire, London, Buckinghamshire, Berkshire and Hertfordshire.

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 leaves as fewer gaps 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. This 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, the Austrian manufacturer has integrated patented I-tec locking technology into each of their aluminium and UPVC windows. This technology gives you 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. 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 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, you can use the I-tec SmartWindows to open your blinds or automate them through the detection of daylight. This is all controlled by a self-sufficient built-in motor.

Visit the I-tec page

What is a 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.

If you’d like to know more, please visit our page – What is a Passive House?

The Importance of Passive House 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.

Our 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