Construction phase - what should be better avoided during the construction phase

Where from: Often recommendation otherwise search engine. Prices: very different. There are daily flat rates or hourly billing. The hour should be between 50 and 80 EUR net. It should include [BER] travel, phone, and other expenses. And he should not charge for every little cough.

How did you measure? Which laser measuring device is recommended?

What should be avoided? Pedantically measuring the last millimeter. Millimeter is a foreign word in construction. (Regarding the question: Buy the cheapest one available)

What should be avoided? Pedantically measuring the last millimeter. Millimeter is a foreign word in construction.

He is right! If the mason has found the right plot, that is already enough

He's right! If the mason has hit the right plot, that's already enough

With boundary construction, it’s not even that trivial

(independent) construction supervisor had been present throughout the entire construction period and the planning was also subjected to an inspection by an expert.

I understand the part about the construction supervisor; it is supposed to be an "Independent Expert for Construction Supervision (IHK), publicly appointed and sworn in."

the planning was also subjected to an inspection by an expert

I have two questions regarding this: What kind of expert?
Second question: Would you have liked the -->planning by an expert<-- to be subjected to an inspection
OR
should an expert have subjected the -->planning<-- to an inspection.

I hope I was able to clarify the difference.

I understand the thing with the construction supervisor, it is supposed to be an "Independent Expert for Construction Supervision (IHK), publicly appointed and sworn in." I have two questions about this: What kind of expert? Second question: Would you have liked the -->planning by an expert <-- to be subjected to a review OR should an expert have subjected the -->planning<-- to a review? I hope I was able to make the difference clear.

Ok, let me elaborate! Our planning (i.e., floor plan, submission plan, etc.) was done by the general contractor. Unfortunately, it was very "poor," which might have been noticed by an expert (someone who knows about it). The bigger issues that caused us sleepless nights were: - House too low - Controlled residential ventilation does not fit in the house - Therefore, no gas heating but air-water heat pump - Wooden staircase does not fit in