I am about to buy a house in Santa Clara, CA county that has an ADU. As of today ADU has guest house and an operational garage.
Seller is convinced that 990 sqft guest house in the ADU was built legally together with the main house under the same permit. Hence seller is counting guest house square footage in legal livable area.
However, I called county assessor and he told me that total living area for the property is only 4,180 sqft. This number exactly matches the main house and nothing else. Assessor also told me that property has 1,976 sqft garage. He said that they receive information from building department and permits while possible get seldom lost.
So, seller agent sent me this permit back from 1985, which I believe was issued at the time main house was built. He claims that this permit proves that 990 sqft guest house is permitted, because
- "residence" in "residence+att garage" in his opinion refers to guest house and not to the main home.
- seller claims that bathroom in ADU shows up on blueprints. And there would not be sole bathroom without guesthouse.
However, I am still unconvinced that guest house was introduced under this permit, because:
- "residence" on this permit could actually still refer to the main home.
- assessor does not have any information about this guest house at all.
- it feels strange that guest house was introduced together with the main house but assessor did not know anything about living area beyond the 4,180 sqft.
- if guest house is permitted then on this permit I expected to see number ~990 sq ft. OR
- if I would subtract garage size (1,976 sqft as per assessor) from what I believe is the total ADU size (2,683 sqft), then I am left with only 707 sqft. So how could 990 sqft guest house be squeezed in a 707 sqft area?
How can I make sure that guest house is permitted? Does this permit in any way prove whether guest house was built with permit?
Update #1: Saw blueprints and it clearly shows that what they call as "Guest house" is actually labeled as "Work shop". If my understanding is correct, then Workshop does not count towards "legal livable area", but yet they still included it.
