Retrofitting is an effective solution worth considering when you’re looking to upgrade your windows, especially from single to double glazing. However, several drawbacks must be weighed up to determine whether it’s the best option over a full window replacement. We’ve broken down exactly what retrofitting entails, the costs, pros and cons, and how it compares to an entire window replacement.
What is retrofitting?
Retrofitting partially replaces windows with the existing frame left in place, the window sash and glass panels removed, and new models fitted. Retrofitting can be a fantastic idea for people looking to replace single-pane glass with double glazing to improve their home’s energy efficiency, improve their window’s safety features, or if you have a cracked window pane that needs replacing. It’s a budget-friendly solution to upgrading your home.
How much does retrofit double glazing cost in NZ?
Due to retrofitting being a less complicated job, it is cheaper than replacing your entire window. It comes in at about half the cost of a full window replacement, as labour hours are reduced, and the cost of a new frame doesn’t have to be factored in. Depending on what exactly you’re looking to do when retrofitting, here’s a rough cost breakdown of the work:
- Installing double glazing – depending on the size and shape of the window, this will likely cost around $300-$600, with custom or extra large windows costing up to $1000.
- If you’re looking for a budget solution to improving your home’s energy efficiency, adding weatherstripping and resealing your windows could help reduce drafts for as little as $100.
- Window films are a cost-effective way to add UV protection and reduce heat in summer for a couple of hundred dollars per window.
How does retrofit double glazing work?
You can opt for an interior or exterior retrofit when retrofitting double glazing. In the latter, an extra layer of glass or plastic is installed to reduce heat loss. The extra pane is installed with an air gap between the two, which reduces heat transfer between the two layers, reducing the heat lost to the outside and cold or hot air transferred into the property.
Depending on what type of double glazing you opt for and the quality of the existing glass pane, another option would be to completely remove it and reinstall a full double-glazed unit if the existing one isn’t in a state to be restored.
Can you fit double glazing into existing windows?
Absolutely! This is the process of retrofitting and requires less time, effort, and cost than a full window replacement. You can salvage the existing frames if they’re in good condition and fit the double glazing for around half the price. Fitting double glazing is a fantastic option to help reduce heat loss, improve your home’s sound barrier from the outside world, and improve the look of your home with a modern refresh.
Is it worth retrofitting double glazing?
When considering retrofitting double glazing onto your existing windows, there are a few factors to consider. The main one is the condition of your existing window frames. Despite retrofitting being significantly cheaper than a full window replacement, if your existing window frames are old and will need replacing eventually, it might be worth considering getting new frames at the same time so that you’re not investing in double glazing that will need to be replaced in a few years’ time.
In addition, while retrofitting is the cheaper solution, a fresh, factory-installed double-glazed window will be more energy-efficient, with more heat transfer reduction capacity and less likelihood of drafts. A new window replacement is also a great time to improve your home’s safety with new window lock features that may not have been available on older models.
Should I retrofit or replace my windows and doors?
Whether you should retrofit or replace your windows and doors depends on your budget, goals, desired level of energy efficiency, and longevity.
- Budget – retrofitting is the budget alternative to a full replacement, generally coming in at half the cost.
- Aesthetics—If you have an old property and want to maintain the original style, retrofitting is a less invasive solution to preserve the original windows. However, a full window replacement will give your property a fresher feel if you want to upgrade it to a modern style.
- Energy efficiency – while you will see an improvement with retrofitting, a full window replacement is likely to increase your energy efficiency with the opportunity to weather-seal your frames and install factory-grade double glazing with a much lower risk of drafts and heat loss.
- Longevity – if you’re retrofitting onto existing timber frames, it’s important to remember that those frames may need replacing soon anyway, so you may lose money on retrofitting if you need to replace the entire unit soon. A full window replacement can last anywhere from 20-60+ years, depending on your new frame material.
Retrofitting could be the perfect option if you’re looking for a budget-friendly solution to improve your home’s efficiency and your current window frames are in good condition. If your existing window frames need replacing soon, or you’re looking for the most energy-efficient solution, a complete window replacement could be the avenue.
Still have questions? Get in touch with us today and we can help.