Most timber and aluminium windows can be changed from single to double glazed with the minimal amount of disruption to the existing joinery. We will call out discuss your needs and advise as to the best approach to obtain the desired outcome, so there is usually no need to remove your existing frames. There are literally hundreds of formats to make up a double glazed unit so it is not a one size fits all application. What we do is install the same insulated glass units that new homes have and not the inferior clip on secondary glazing systems that are out there.
Check out the FAQ section for more info on the types of Double Glazed Units available.
Firstly lets get one thing clear.
Retrofitting your existing windows is not as expensive as
you may be led to believe. But in saying that every house is
different and every persons requirements are different. One
thing is for sure, you WILL add massive value to your home, and
the basic industry figures are approximately 80-90% return on
your investment whilst all the time enjoying the benefits of a
warmer, dryer and more healthy home.