Are you sure that guy is not a Laestadian?
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€10,000 would've been a reasonable estimate for that bathroom+sauna job this year.
That sounds about right to me. We had estimated 12 total for the upstairs bathroom, and we got one estimate in at 25+electricity - we said no. The variance between estimates is very large.
For example, we are heating the attics and the first estimate we got was 40K (1000€ a m2) - the next was 15K - the next 7K. Quite a difference - material costs are 34€ a m2.
You definitely have to invest some time in the negotiations and check out the companies. It can save you a ton of money and spare of you a world of pain.