poor quality window install

[Balou]

hello all. We moved into our new build home 3 years ago. It was a single build with a builder we trusted.  There have been substantial problems with the windows that were installed by a local installer who was brought in by the builder. In those 3 years, weve had 6 sealed window units and a bifold door unit fail and have to be replaced. Weve had a 4.5 m bank of balcony doors and windows had to be removed because rain water  had got in around the frame and damaged the ceiling below it(in about 12 places). The frames had also cracked through in two corners. The replacements were fitted, but still draughty. A 4.5m set of bifold doors has had ongoing problems with rain and draughts getting in, despite numerous visits by the installation company and are still a problem (draughts will easily blow a candle out on a windy day). Weve got 3 top hinged ground floor windows that if we open them in the summer on hot sunny days, they warp and we cant shut them again for several hours. We also have several sealed units in a double height staircase window, where the upvc frame has cracked through in 2 corner joints, which im wondering if its structural with the weight of 2 sealed units above it pressing down. On top of that, numerous visits and repairs by the installers where locking mechanisms on the windows have failed (taking months to replace) etc. Ive honestly never come across so many problems with windows before. On top of this, we have a huge amount of air getting past the cavities and wall insulation to the point that air coming from behind a wall mounted stat ( located about 3 feet from the bifolds) will blow a candle out and cause the stat to be permanantly calling for heat. With that in mind, and with all the other quality issues, im wondering if the windows have been fitted without cavity closers being present- Is that possible? Really not sure what our best course of action is now. We havent paid the installers direct as they were brought in by the builder, who's not being particularly helpful. Thinking of getting an independent surveyor to do a report, but not sure where to find one ? Sorry for the long spiel, but its been a long three years. Any suggestions would be appreciated.

[Nickfromwales]

What make are the units?

[craig]

1: Location.

2: Window manufacturer/brand

3: Bought by installer or made by them?

4: photos/videos?

 

Let us know and we can assist if we can.

[Balou]

I believe the units are made by Sternfenster, in Lincoln (although the installer is rather guarded about this for reasons unknown)and bought in by the installer . We are located near Wisbech, Cambs. I’ll sort some photos out tomorrow hopefully. Many thanks. 

[Nickfromwales]

Just now, Balou said:

I believe the units are made by Sternfenster, in Lincoln

Guess who you're ringing tomorrow for a chat about this installation!!

[Mr Punter]

It sounds like a combination of poor fabrication, poor install and poor quality sealed units.  I don't know how the profiles perform.  I think they are Deceuninck.