Evaluate offer from solid builder

this refers to the connection of the rain downpipes?!
And since a house usually has 2 (or more) downpipes, the length would be more than 10 meters if a downpipe is located opposite the sewage shaft.
I can't say the price.

Yes, the rain downpipes connected to the transfer shaft and the sewage pipes connected to the transfer shaft. It was a mistake on my part. As you rightly say, there are more rain downpipes and thus the 10 meters will not be sufficient.