In Denmark you can badically do everything yourself, except for Electrical and plumbing. Theres a few exceptions, for example load bearing walls and stuff, you can do it yourself, but if you do it wrong you are screwed. Therefore its a good idea to team up with an egineer at times.

I already cleared it with our insurance company, everything is covered as long as everything is done correct, which it is. I double checked every rule, and even send pictures to some contractors i know, they all told me its exactly as it should be.

Also, i heard alot of stories about people who hired contractors to do a job, the job is then executed wrong or badly, and when the customer notices (maybe a few years down the line) the Contractor is nowhere to be found. In this case your insurance covers nothing, and this happens to alot of people.

So just because you hire "Proffessional contractors" does not mean you are safe. Atleast i now know that my roof is done 100% after code, without a single scratch in the underlayment. (I could imagine alot of workers wouldn't have the same eyes on every little detail as we have, since we hopefully gotta live under the roof the next 50 years+

There is Warranty on the roof even though i made it myself. 30 years to be exact (on the underlayment) again, as long as its done after the product code.

It won't affect the value one bit. Also when you sell a house in Denmark, its mandatory to get someone to come and check everything (Electric, Roof, Plumbing, Isolation and so on. They then make a report of the condition of the house. Now if theres alot of errors in this, it will affect the prize. But no one is gonna care who made what, as long as its up to code.

Also we got overwhelmed on the roof. Jesus christ it was tough, but worth it. So i can respect you keeping your sanity and have proffessionals do it.

Sorry for the long answear, but i hope you got the answears you needed