Double glazing window renovation price: cost, estimate and advice

Do you want to turn to the renovation of double glazed windows for your home? An ingenious solution to save energy and gain in comfort! Our experts guide you step by step towards the realization of your project.

Double-glazed window renovation: what are the possibilities?

The renovation of double-glazed windows consists of replacing a single-glazed window with a joinery with double glazing. This type of renovation makes it possible to provide better thermal and sound insulation to a home and thus to save energy while being much less disturbed by outside noise.

Currently the standard double glazing is said to be 4/16/4. This means that the two glass plates are 4mm thick and the space between the two is 16mm. Contrary to popular belief, this space is not empty; it contains air, or more often a gas, argon, which contributes to sound and thermal insulation of the glazing.

There are several possibilities for renovating double-glazed windows: the installation of oversight, replacement of the window with a new one or the installation of double-glazing.

The installation of a glazing

Over-glazing is a simple technique that consists of adding a glazed part to the existing glazing, which allows you to go from single to double glazing without any real work. However, this practice is only possible on wooden windows. Fast and inexpensive, it nevertheless remains the least effective technique in terms of insulation. Additionally, oversized glazing requires more maintenance than other devices due to the unsightly whitish haze that forms between the panes over time.

For the installation of an extra glazing, count on average 100 euros to 180 euros, the material and the installation included.

Replacing the window with a new one

The straightforward replacement of an old window model with a more efficient one is the most obvious solution. To gain not only in glazing, but also in insulation and comfort, you can opt for a completely new joinery in PVC, aluminum or wood. If you don’t want to bother every year with maintaining your windows, PVC and aluminum are the most recommended materials; the new models even know how to imitate wood for those who love the natural and the authentic.

However, it is unfortunately frequent to observe losses of opening dimension. You should know that the new window is placed where the old one was and is therefore fixed on the previous joinery. To avoid damage and limit heat loss, it is recommended to have your new windows installed by a competent and qualified carpenter, and to carefully check the site.

For the replacement of a window by a new one more efficient, count on average between 70 euros and 1,200 euros, costs of material and installation included.

The installation of double glazing during renovation

Only a qualified and competent carpenter will be able to carry out this type of service, and only on the condition that your joinery is sound and in good condition. Indeed, your carpentry must be able to withstand the installation of new glazing.

Be aware, however, that the aesthetics of your window may be compromised by this type of device. Indeed, it is frequent that the glazing is slightly too large and that it protrudes from the rebate.

For the installation of double glazing in renovation, count between 350 euros and 600 euros on average, material and installation included.

The different types of glazing

There are several types of glazing, from the most simple and classic to the most sophisticated.

  • 4/16/4 double glazing: this is the classic type of double glazing installed in most homes. It combines two 4mm thick glass plates with a 16mm thick intermediate space filled with air or argon gas.
  • Double glazing 4/20/4: this form of glazing is more recent. It is not systematically advised nor more efficient; its creation responds more to the democratization of thicker glazing intended for burglar-proof security. There are now many such products on the market.
  • Burglar-proof glass: this type of glazing is very resistant and therefore acts as a real retarder in the event of an attempted break-in. It is generally recommended for all glazed openings which cannot be protected by a shutter or grid.
  • Safety glass: this type of glazing has no anti-burglary specificity; it is a glazing which limits the risk of injury in the event of breakage. Indeed, if the glass is broken, it will split into large pieces instead of shattering and scattering into smaller more dangerous fragments.

How to choose your new windows? Advice from our experts!

Faced with the many possibilities available to you, it is not always easy to make a choice. Our experts provide you with all their advice to better guide you towards the solution that suits you.

Tip n ° 1: the technical characteristics of the glazing

There are several criteria:

  • Uw: this is the thermal transmittance coefficient of the entire window, that is to say the joinery and the glazing. The lower the Uw, the more insulating the window. In other words, a window with a Uw of 1.1 will perform very well in terms of insulation; a window with a Uw of 1.3 will perform well, etc.
  • Sw: this is the solar factor. The greater the solar gain, the less it is necessary to heat in cold weather and the more it is recommended to close the shutters in hot weather. The Sw evolves between 0 and 1. Ideally, a good window cannot display a Sw less than 0.3 and includes an excellent solar gain starting at 0.6.
  • AEV:
  • The A refers to the level of airtightness of the glazing. A4 is the most efficient in waterproofing. It is not recommended to choose a model lower than A3.
  • The E refers to the resistance of the glazing to water, in other words rain. The classification of the glazing evolves from mediocre (E1A) to excellent (E9A).
  • The V refers to the level of resistance of the glazing to wind. If you live by the sea or in the south of France, opt for very resistant glazing, you will find more comfort. The ranking ranges from poor (1) to excellent (5) and from A to C.

Tip 2: vigilance! vigilance! vigilance!

The renovation of double-glazed windows is a project that needs to be reflected and prepared. Here are the tips of our specialists in the field:

  • Replace your windows in winter: avoid the summer, because in the event of faulty workmanship, you will no longer be able to act. By changing your windows in winter, you will feel more of any heat loss and the passage of cold air that infiltrates the home, synonymous with poor workmanship. Likewise, pay the bill only after making sure that the new window is perfectly waterproof. Do not be rushed by the craftsman, you have a legal period of several days to pay the balance of the invoice after completion of the work.
  • Have a CMV installed: if your home is not equipped with a CMV, you will need to install one. Indeed, your home will be much better insulated after the installation of your new windows and the CMV will allow the air to circulate better and thus evacuate the natural humidity so as not to allow time for mold to form.
  • Think about the acoustics: thermal insulation is not the only one that matters. If you live on a busy street, near a road or a busy site, be sure to install high-performance glazing for sound insulation.

Double-glazed window renovation: what price?

The price of the renovation of double-glazed windows can vary greatly depending on the glazing formula chosen, the type of joinery and the prices charged by the service provider responsible for the installation.

  • A standard double glazing model can cost between 55 euros and 120 euros per m². The thicker the glazing, the more the price increases.
  • A glazing model with enhanced sound insulation can be billed between 140 euros and 200 euros per m².
  • Burglar-proof self-timer glazing will cost you between 100 euros and 250 euros per m².
  • Finally, for a luxury heated model, count between 800 euros and 1000 euros per m².

If the investment is significant, you will quickly see an improvement in your comfort and a reduction in your consumption – and therefore your bill – of energy. Indeed, between 5 and 30% of heat loss occurs through the windows!

Finally, unfortunately, be aware that it is no longer possible to take advantage of the tax credit for the replacement of windows since July 1, 2018.

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