Black Knight Secondary Glazing
Black Knight Secondary Glazing

Secondary Glazing Windows & Doors

We install high quality aluminium secondary glazing windows in all types of properties in the UK. We cover the major cities of London, Birmingham, Bristol, Manchester, Leeds and Liverpool together with many other areas.  

About our secondary glazing windows

We are specialist suppliers and installers of aluminium secondary glazing windows with over 30 years' experience of this product. Unlike many companies we do not just do secondary glazing as a sideline to other glazing products.


Our extensive range of systems has been developed over many years and is designed to achieve:


  • good thermal insulation


  • optimum noise reduction


  • additional security


  • condensation control


  • discreet appearance


  • maintenance-free product


Secondary glazing windows - prices and costs

Secondary glazing windows are the most cost-effective way of achieving maximum thermal insulation of your existing windows and doors and, when installed with high performance acoustic glass, will provide optimum soundproofing.


Our products are all bespoke and measured to exactly fit your particular situation. We ensure that whether you are trying to combat draughts, heat loss, noise or security problems our products will always perform to the highest levels.


If you would like to discuss your requirements in more detail then please either ring us on 0808 168 5208 or contact us by clicking here.

How to order our secondary glazing windows

We will visit you to assess the best options for your particular situation and provide you with a tailored quotation for the required work. If you decide to accept our quotation for secondary glazing windows we will then arrange for our technical surveyor to take exact measurements for manufacture.


As part of our survey we will ensure that:


  • the designs allow escape in the event of fire
  • safety glass is installed where required by legislation
  • windows can be cleaned easily
  • visual site lines are matched to your existing windows
  • fixings are designed to be concealed
  • we use a variety of matching finishing trims to ensure a neat installation


When your new secondary glazing windows are completed they will be inspected prior to despatch and wrapped in protective heavy-duty polythene during transport. 


We will agree an installation date with you and arrive on time to complete the fitting. On completion, our installer will demonstrate how the windows work and leave you with maintenance instructions to ensure your product remains in prime condition for many years. 


Finally we will send your no-quibble guarantee paperwork a few days after installation. 

For more information

We are always happy to give you unbiased advice on the best solutions available. Whether you are trying to stop draughts on poorly fitting existing windows, reduce heat loss through current thin single glazing, combat excessive noise from traffic, aircraft, a busy street or noisy neighbours or deal with potential security issues caused by insecure primary glazing we will be sure to have a solution.


We also supply and install commercial secondary glazing in offices, schools, hotels


Please call 0808 168 5208 or click here to contact us

We're on the leading double glazing directory.

It is likely that Secondary glazing sash windows is within your budget so if you are in Haringey Hounslow Hackney Plymouth Rotherham Milton Keynes Hull Wolverhampton Derby Stoke on Trent Harrow Havering Southampton Salford Bexley Barnsley Camden Westmonster Trafford Oldham Islington or Tameside then contact Black Knight for friendly informed advice