Sealtight Windows | UPVC, Windows, Doors, Conservatories, Middlesbrough, Cleveland, Stockton on Tees
Sealtight Windows | UPVC, Windows, Doors, Conservatories, Middlesbrough, Cleveland, Stockton on Tees


Here at Sealtight Windows NE Ltd, we manufacture and install Kommerling windows, in a wide choice of frames, in a number of different colour finishes. This combined with a range of glazing options, allows us to help you get the right finished product your home deserves.

Who Are Kommerling?

windows_picKommerling are Europe’s No.1. Established in Germany in 1897, and with operations in 21 different countries across the globe, Kommerling is not only a leading player in the UK, but throughout Europe. The company has been designing UPVC window and door systems for over 40 years and have led the way in innovation, quality and environmental awareness.

Kommerling are one of only a handful of companies that have removed lead additives from all of their products, and are now focused on using recycled materials in as many of their products as possible. This commitment to providing an environmentally friendly product combined with their knowledge and expertise, allows us to give our customers one of the most energy efficient windows available.

Kommerling UPVC profile has a patented 5 chamber profile, for increased thermal performance, unlike many of their competitors who are still using outdated 3 chamber profiles. Kommerling C70 also utilises soft sculptured lines in both the frame and sash, and the low line gaskets give a much slimmer sightline. As standard, all of our Kommerling windows and doors, are supplied and installed with…

  • 70mm Profile Depth
  • Patented 5 Chamber Profile for Improved Thermal Performance
  • Reinforced Profiles
  • A Choice of 44 Unique Colours and Finishes
  • Internal Beading For Enhanced Security
  • Comprehensive 25-year colourfast guarantee.

Through our partnership with Kommerling, we have been able to invest in products that can be individually tailored to your needs. We can work with you to achieve the look and finish for your home, be that for one window or a full house of windows. We have seen a surge in demand for windows in new colours such as Anthracite Grey, Black and Traditional Cream, all of which allow you the customer to make your investment all the more individual.

To complement our Kommerling window frames, all of our glazing is supplied by Pilkington glass. Pilkington are unrivalled in their field in terms of product development, innovation, and product quality. Our partnership with Pilkington glass allows us to offer the latest products to our customers and superior quality double-glazed units to those offered by our competitors. Along with a range of energy efficient glass such as Pilkington K OW, we are also able to offer a range of textured glass for those areas where privacy is of the utmost importance.

Make cost savings, and be energy efficient!

Energy efficiency is one of the buzz terms for the 21st Century and quite rightly so. We’ll eventually run out of natural resources and so that’s why governments across the globe are looking at ways in which to cut their respective carbon footprints. We can do our bit by using less in the home and by investing in more energy efficient products.

The five chambered design

KÖMMERLING’s O70 Gold system has 5 chambers, unlike the dated 3 chambered designs of many of their competitors. This means that the products we install are more energy efficient and that’s a fact. We can also offer energy rated products as seen on white goods on the high street, while others can offer low U-values, which help keep the warmth in.

The thermal image of the house above, shows the green areas (top left) where old windows have been replaced with modern energy efficient ones, in contrast to the old existing windows shown in magenta, which let considerable heat out of the home.


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