Renewing Windows - Checklist

Renewing Windows - Checklist


Renewing windows has far-reaching consequences for the home and heating costs. But when is the measure really worthwhile?

Windows are part of the outer shell of the house. This should optimally have a uniform thermal insulation. If there are areas that are significantly poorly insulated, the air will cool down at these spots. Since cool air can absorb less moisture than warm, condensate accumulates. Mold threatens. On the other hand, good insulation is important to avoid heat loss. The U-value indicates how much heat per square meter of window area is lost.

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Checking whether the replacement is worthwhile

The desire to save heating costs can not always be realized by installing new windows. If there is triple heat-shielded glass with coating and gas filling, the savings from renewing the windows are low. It is worth replacing if one of the following criteria is met:

  • A single-pane glazing is installed and the walls are insulated promptly for replacement (U value above 5.8).
  • The window surfaces consist of multi-pane glass without inert gas filling and the walls are insulated (U-value between 1.9 and 2.7).
  • There are windows of this kind in the house and the house is supposed to be insulated in the next three years.

The effort of exchanging windows

The cost of the exchange is manageable, home improvement should better keep away from it. Craftsmen do the exchange quickly and cleanly. So that no cold bridges arise and the windows are tightly connected to the masonry after installation, it requires anyway a professional. This procedure is usual:

  • Talk to an energy consultant to select the best windows for the house.
  • Use this to check whether further modernization is absolutely necessary.
  • Dimensioning of the windows by the specialist company.
  • Before the installation, empty the sills and create a space of about two meters in front of the window.
  • Installation of a window by a specialist takes about two hours.
  • Then decorate the sills and put the furniture back in place.

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Costs of the measure

The costs, of course, depend on the type of windows and of their size decreases. For the advice of the expert and the renewal of the windows, homeowners can get funding from the KfW. The following costs are rough guidelines. For example, if you have the windows of an entire house renewed, you will have to pay much less for the installation per window. Overall, the installation costs are low compared to the material costs.

  • Advice on thermography by an energy consultant costs about 800 euros for a single-family home.
  • The cost of one square meter window area is between 300 and 800 euros.
  • Installation of a window costs between 100 and 150 euros.

When renewing the Be sure to consult an energy consultant

It is important to plan the renewal of the windows with an energy consultant and to transfer the installation to a specialist garage.

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