Repair leaking wooden windows or install new plastic windows

Hello dear people,

we have 9 windows in our house, 5 of them are floor-to-ceiling windows.
The windows are 36 years old.
The windows are made of wood, are partially very drafty and the paint has not been refreshed for years.
The wooden windows have a U-value of 3.1
The new double glazing has a U-value of 1.1
You can currently hear the cars on the street side.
The cost to renew the window seals and repaint is about 2000 EUR
New plastic windows with window sills including installation about 13000 EUR
In my opinion, renovating the windows is not worthwhile; new glazing, seals, fittings cost about 4000-5000 EUR
My gut feeling says new windows...

What do you recommend?
The carpenter does not give a guarantee that the seals will be 99% airtight if they are renewed.

Thank you very much

If it fits within the budget, I would install new windows. Then you will have peace of mind for a while and the maintenance effort is lower. Better insulation comes with it as well.

If the budget allows, I would install new windows. Then you'll have peace of mind for starters and less maintenance. Better insulation comes with it as well.

Thank you. Our house is not insulated. Double or triple glazing? Because of the risk of mold.

Best regards

Our house is not insulated.
2 or 3 pane glazing?
Because of mold risk.

Definitely triple glazing. It doesn't cost much more but feels better or not as cold on the glass. Mold has nothing to do with the number of panes. Both are airtight. The windows are also installed airtight.
==> always heat all rooms properly and ventilate thoroughly

Quiet triple glazing. Doesn’t cost much more, but feels better or not so cold on the glass.
The mold has nothing to do with the number of panes. Both are sealed. The windows are also installed tightly.
==> always heat properly in all rooms and ventilate properly

Is that really the case? We recently replaced our windows and asked ourselves the same question. The result after research and confirmed by our energy consultant (which doesn’t necessarily mean anything):
The windows are still supposed to be the component with the worst U-value, so that condensation always forms there and not on the wall... With an uninsulated wall and triple glazing, that might no longer be true...
According to the energy consultant (which again doesn’t necessarily mean anything), however, a thin insulation is already enough (I think he said just 1 cm) so the wall insulates better than a triple-glazed window...

By the way, we are happy with our new windows. To my surprise, it is not the reduced draft feeling (which is definitely noticeable) that is the greatest benefit for us, but the significantly better sound insulation... at least here in the city

Is that really the case? We recently replaced windows and asked ourselves the same question. Result after research and confirmed by our energy consultant (which doesn't have to mean anything):
The windows are still supposed to be the part with the worst U-value, so that condensation always forms there and not on the wall... With an uninsulated wall and triple glazing, this can no longer be the case...
According to the energy consultant (which also doesn't have to mean anything), however, even a thin insulation (I believe he said just 1 cm) is enough for the wall to insulate better than a triple-glazed window...

By the way, we are happy with our new windows. To my surprise, it's not the reduced draft feeling (which is definitely noticeable) that is the biggest benefit for us, but the significantly better sound insulation... at least here in the city

Do you have triple glazing?
Do you have external insulation on the house?
Three companies came here, none recommended triple glazing because there is no insulation and mold can form.

And then one company from Weru said if the masonry is thicker than 30cm, there is no mold with triple glazing. Of course, you still have to ventilate properly.
And the best part, triple glazing is subsidized by the KFW, so you get 20% of the total amount reimbursed.

Best regards