Is it allowed to construct an extra WC in an house? Do we need to have a permission from the gemeente? And lastly, any idea of the cost that one will incur if one plans to build an extra WC?
Yes, you can add a WC
No, you don't need permission, but a quick phone call to the gemeente is prudent.
Cost depends entirely on your house and the randomness of being able to actually find a plumber prepared to do the work. Don't expect miracles.
Getting water to it should be fairly straightforward. But does the location have easy access to a soil pipe? That could be a very high cost. If it is above or below an existing WC then you are ok.
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