The only time I have seen an increase in property tax was when some one added on more sq. footage to the home. People think that just because you pull a permit the tax office is ready to attack when that is not always the case. But in any case you at the same time can remind the HO that if they proceed with unpermitted work and something happens they run the risk of there home owners insurance not paying off due to unpermitted, uninspected work.
In the case of a basement (non-finished habitable space) - finishing it and making some extra 'bonus' rooms out of it - will in many communities have the tax man sitting at the permit counter helping to determine the new habitable sq' of the building, and shortly after - its value, which may or may not be based on size, but still market value - and yes - nailing you for every dime. Why - that's their job, and they need to fill the bank accounts of the AHJ aka city or town. Most places are a little more subtle - they wont sit at the counter, they get a list from the permit office, then show up later to reassess you.
Example: We got reassessed for repairs to a deck -
because we pulled a permit. Why they have bills to pay... Why did I pull a permit, because down the line I want a record of repairs to it, and it's existence over a retaining wall.... Did it increase my taxes - no - they went down slightly...
(like $25...)
Now closer to the tread - I have a finished -completely unpermitted unit with kit and bath in my basement - that we bought with the house... But is not connected to the living space above... We call it "storage"... (And that pretty much what we use it for too...) - Since it did not have permits - it does not exist! I once had some gas repairs, and the plumbing inspector was looking to give me grief about it - talked him into allowing me to remove the gas line to the "storage' areas stove... To limit the scope of the permit... So I still have 2 stoves in the house, only one is connected in my kitchen - only one is assessable...
The Assessor came right away (two weeks or so) - 'whats back there?' - storage... 'No operational appliances?' - nope... Result - up slightly. (like $25...) But if I pull permits for putting a piece of sheetrock in my garage that would tie the 'storage area' to the rest of the habitable space above - you can guarantee my taxes are going up substantially... Because the value as a storage area is one thing, the value of the house as a whole is another -
which is what it would be based on... But the value of the construction is based seperately depending on what it is... My property is a 1300sq' home to the assessor, the little bit of sheetrock would make it 2000sq' in the eyes of the assessor - then I would have to argue its total value. Which may or may not change...
In todays market...
So - I can see the worry some people might have with permits, but permitting a basement remodel 'right now' in this market may serve them better in the long run. But I doubt anyone will take any advise on that. Because of fear of the tax man...
For the record though - I have had customers
complain -
to me after the fact - that they did not know the permit I pulled for thier 'service upgrade' would trigger a reassesment. As if I lead them down a dark path... Then I ask - well how much did it change? And it's peanuts... (Because they are new homeowners.) But there would be no other way for me to do it.... If you owned a home for 30-40 years - it might be a much bigger shock... (IMO suck it up - you haven't paid your fair share in a long time...
) Another example - And a company I used to work for bid on the electrical and landscape lighting there. (didn't get it.)
Larry Ellison Reassessed -
$3M refund - because there is little market for his palace....
It sent a wave of people begging to be reassessed - and many of them - lower taxes...