If your living comfort is constantly affected by defects, the situation clouds your quality of life. A scratch on the front door, loose wallpaper, a dripping faucet, mold on the walls... Even if it's just a visual defect, you keep looking and
...
feeling annoyed. The house is not in order.
Hidden defects can cloud your enjoyment of the property, after initial harmony, even years later. Do you know this... "no sooner has the warranty expired than the thing goes haywire"?
Many a builder acquires or builds a property under the delusion that his financial reserves, and perhaps also the overly optimistic assumption of his own performance possibilities, will suffice. Thus it pays a far exaggerated purchase price in the comparison to the actual financial/refurbishment need. The inspiration of the price-hungry salesmen and brokers, often with favorable appraisers in the hand luggage, credit-maximizing bank advisors, order-hungry craftsmen and planners or other careless guarantee people overlook substantial, somewhat more hidden, but to each specialist immediately obvious lacks and nourish so the Utopie of the favorable reorganizing/building, mostly to the own advantage.
Do not push your luck!
With expert support, you reduce the probability of unpleasant surprises to a minimum. And your monetary advantage is, in the truest sense of the word, subsequently obvious.
Real estate + expertise = joie de vivre
Comment from Sachverständigenbüro Manfred Girth®: 
Sincere thanks