Gable roof is not centered - any experiences?

Unfortunately, the new roof is not centered; the ridge has shifted 15-20 cm to the left. Consequently, the overhang on the left is 20 cm longer than on the right. A correction is not possible without a complete dismantling. The construction company suggests either extending the right roof overhang or shortening the left roof transition. The question is: does the proposal make sense?

No, these proposals do not make sense. The fault lies with the executing company. No reasonable bricklayer checks plumb and angles only in the last course; this should apply to carpenters as well. Do you have a completion guarantee? if yes) dismantling is not your problem and the cleanest solution. if no) I would prefer a shifted roof installation—at least if it does not affect the statics—still sealed, to the "alternative" of having it dismantled, the company then going bankrupt, and rain coming in. However, the price reduction should be a solid five-figure amount, and the company should additionally cover all costs for approval corrections.

Deconstruction is always a matter of proportionality, but I see the financial limit of not doing it here as extremely high, so I would demand that first. However, prepare yourself for a longer process.

Who would even notice something like that only when the roof is completely on? That is not acceptable. The carpenter should have noticed that at the latest with the first rafter.

Request the contractor to rectify the defect.

Did you do individual contracting? Or is the renovation handled by one party?

I also cannot understand how this can happen. Drawing a perfect circle freehand is likely difficult for most people. But here we are talking about supposed professionals who should be able to easily place a triangle centered on a rectangle. Unbelievable. I would not accept that.

My carpenter measured all bearing points before he approved the workshop planning for the timber framing.

When I asked why, he said he had often experienced that the supports were not executed according to the plan.

Dismantling is always a question of proportionality,

That is why I also find it absolutely disproportionate to keep measuring instruments in your pocket until five to twelve. Such errors do not magically occur in the last meters before the finish line of the marathon.