Call: (04) 494 7230 or Email:

Address: 21 Lower Tyers Road, Ngauranga

Retrofit Double Glazing

Retrofitting double glazing into timber joinery is a complex and specialist job that requires the expertise of qualified joiners experienced in double glazing timber windows and doors. At Well Hung Joinery you get just that.

We believe that the best way to retrofit double glazing is to replace your tired and worn out timber sashes and doors with new custom made ones that are built to carry the additional weight of double glazing. As the original sash or door was not made to carry the weight of double glazing, simply replacing the glass for new double glazing will often mean the door or sash is weakened and over time will eventually fail.

All our new doors and sashes are made using premium grade Cedar and glazed using the latest in glazing design and technology. New doors and sashes are fully primed, and can be topcoated in our factory if you request this. New heavy duty draught seals are fitted during our installation, and new stainless steel hinges are fitted.

The following information is the process you get using Well Hung Joinery.


(Click here for FAQ's on Double Glazing)

Initial Consultation:

The first step to double glazing your home is to provide you with a quote. One of our sales team will visit your home and discuss your requirements. During this visit, your windows and doors are measured to ensure an accurate quote can be given. The existing frames are inspected to check for suitability for new double glazed sashes. A written quote is then given which itemises out each individual room with its cost. Once the quote is accepted, we then begin making the new double glazed sashes at our Wellington Factory.


Once the quote is accepted, your new window sashes and door leaves are scheduled in to be made. Premium grade cedar is used for all external joinery, as it is a stable and weather resistant timber, ideally suited for exterior use. Once the doors and sashes are made, the double glazing units are ordered from our glass supplier, and delivered to our factory where they are glazed by our professional team of glaziers. Different glass types, such as Low E glass or Argon Gas infill are possible options and these are discussed at our initial consultation.



Once made, the new sashes and doors are ready to be installed into your existing window and door frames. We get in contact with you at this point to arrange for a suitable time to carry out this work. We typically use the same joiners who made the sashes and doors to carry out the installation as this ensures a smoother installation. Each individual sash and door leaf is removed from your existing frames one at a time and the new double glazed sash or door is then installed back into its place. The old hinges are replaced with new stainless steel hinges at the same time, and new or existing hardware is fitted back on. The new sash or door is altered if necessary to fit tightly into your existing frames. The installation process can take several days, depending on the size of the order. The sashes and doors are now ready to be painted or stained.

Now you can sit back and enjoy the huge benefits of your new double glazed sashes and doors, knowing they have been made and installed to the best possible standards.

Causes of Condensation.

Condensation is generally recognised as being caused by the moisture in our homes and the difference in temperature between the outside and the inside of your home. The air inside your home contains moisture from your day to day activities. Showers, cooking and even breathing will add moisture inside your home. When the inside temperature cools down, the air cannot hold as much water vapour. The result is that the water vapour condenses as a liquid and becomes visible particularly on cold surfaces such as windows. By insulating your windows with double glazing you reduce the likelihood of condensation forming on the inside surface of the glass. The moisture is still present in your home though, which is why it is important to also have a well ventilated house.


Adding in Planitherm Low E glass, which is a superior, high performance double glazing, will help retain the heat inside your home even more than standard double glazing will. Planitherm Low E glass works by reflecting the inside warmth back inside the room. Because of the nature of this high performing glass, the outside pane of glass can get cold overnight, and in certain extreme situations, the outside pane of glass can have condensation forming on it. This is not considered a defect of the glass, but is actually a sign that this high performing glass is doing its job by keeping the warmth inside the room. As the exterior temperatures rise, this condensation should clear up.

Custom Timber Joinery and Kitchens Wellington - Well Hung Joinery | � Well Hung Joinery 2015