In most cases, there are house plans, but these are usually kept with the other house-related documents at a notary’s office or in a safety deposit box at a bank.
The owners themselves seldom have a copy of the house plans. This might seem odd from a European perspective, but here in Uruguay, buying real estate is basically a matter of “what you see is what you get”, and the plans are normally handed over with the other documents when the sales contract is signed.
If you are seriously interested in a particular property after an initial visit and want to look at the house plans, we will gladly try to arrange if for you.