Timber casements © Harrow Windows Ltd
Timber sashes © Harrow Windows Ltd
Aluminium casements © Harrow Windows Ltd
uPVC casements © Harrow Windows Ltd
Kömmerling French doors and windows
Kömmerling French doors and windows


Advances in the development of replacement window systems means that the ability to retain the character of your home is much easier to achieve than it ever was previously. Period properties can now enjoy the benefits of modern replacement windows that are hard to differentiate from the originals. Woodgrain effect foils look just like painted wood and are available in an infinite number of colours.

We specialise in Conservation Areas and install only top quality products from trusted names such as Interfusion Timber, Smarts Aluminium, AluK, Kömmerling and Rehau uPVC,  ECOSlide by Victorian Sliders and our premium Residence Collection. Windows from across our collections combine good looks with enhanced security features and are thermally efficient, usually attaining at least an A rating.


We install a comprehensive range of door systems that offer outstanding performance and expert design. Choosing only top quality products from trusted names, our doors come in a full range of styles, options and finishes, allowing you to create the perfect door to complement your home. Enhanced security with high performance locking features will keep your home safe and secure. And, with minimal maintenance, an unending selection of colours and all fully guaranteed, you can rest assured that you are installing some of  the most reliable doors available on the market today.

  • Front doors: available in composite, timber, aluminium and uPVC
  • Back doors: available in composite, timber, aluminium and uPVC
  • Sliding and bifolding doors in aluminium
  • French doors: available in composite, timber, aluminium and uPVC
  • Patio doors (sliding): available in aluminium and uPVC
Bereco, Smarts, Residence Collection, Aluk, Kommerling, Rehau


Long gone are those sliding patio doors of the past! The elegantly stylish contemporary lines from the Smarts Aluminium range are our chosen bifolds and sliders now, including the Visoglide premium range with slim interlockers. With over 35 years' of experience, Smarts are one of the UK's leading suppliers of aluminium door and window systems, combining stunning good looks with minimum heat loss, great thermal efficiency and robust secure design. We regularly fit sliders and bifolds, with the bifolds being a particularly popular choice in our conservatories.