Why 120 years?
This plumber is looking for (work only) a bit over 8k for a couple days work. It is crazy considering the work isn't overly challenging and is basic pipe and drain installation for a bathroom. We have two more plumbers coming in over the next few days to make offers so we can see what is the average.
30 halvenings left. One halvening every four years.
That sounds insane. Are you sure that guy is not a Laestadian? We have a bathroom upstairs that is about 5-8 sq.m in floor area and has about a 25 sq.m total wall area. It's got a shower enclosed by walls, a toilet seat and the usual bathroom furniture. We asked one company for how much they'd charge for a total renovation of the space. A young fellow about 20 years of age came in. He talked about the company for a quarter of an hour after taking the measurements and calculated an offer. €23,000. I got off my chair in the kitchen right away and came close to telling him to GTFO right away.
We had the main bathroom including the floor of the sauna totally renovated in an apartment in 2008 and the total size of that job was about one and a half to twice that one we asked an offer for ten years later. The entire cost, materials and all was €6000. Accounting for an average rate of inflation of about 2-3%, €10,000 would've been a reasonable estimate for that bathroom+sauna job this year. Given that this job was half the size and complexity, the company tried to rip us off at a rate 2-3 times the going rate.
I checked and the company was owned by Laestadians. They'd been reported about on the media for ripping off pensioners.
It's a given that one should always ask several tradespeople for competing offers.
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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.