If it is your residence, it is not deductible. It is also not depreciated . The cost is added to your cost basis, for when the property is sold in the future.
If it's a house you rent out, the cost is depreciated, not expensed (deducted). But there are two exceptions:
1. If the total cost was less than $2500
2. the cost plus all your other expenses, for the year, was less than $10,000 and less than 2% of the depreciable basis of the existing structure.
Reference: https://www.biggerpockets.com/blogs/6032/41669-understanding-the-safe-harbor-rules-and-keeping-money...
