How to report casualty loss to the house

[zfyang]

The turbotax ask 4 questions:
(1) the cost basis, I assume that is the price when I purchased the house
(2) insurance payment
(3) FMV before loss, I assume I can get this value from Redfin estimate, I assume this number is $N
(4) FMV after loss, I don't know how to get this number

There are multiple damage to the house, the fence, the roof and the patio. The insurance company pay part of the fence and patio, but don't pay the roof.

The quote is around $X, the total money I've spent so far is $Y, $X > $Y because I did some tasks myself, and some tasks are not done yet.
May I get the (4) by $N - $X or $N - $Y, or hire some expert to evaluate the house?

[Bsch4477]

There is no casualty loss tax deduction unless due to a federally declared disaster. Is that your situation?

[zfyang]

I live in north California, there is  a federally declared disaster in 2023, and my house was damaged by that disaster.

[xmasbaby0]

Are you in a federally declared disaster area?   If not, then casualty losses are not deductible on your federal tax return.   You have not mentioned the cause of the damage.