If I forgot to take deduction for Home Improvement (replaced door and windows) in 2015, can I claim it on my 2016 taxes

[Howard1948]

No.  Assuming that what you want to deduct or get a credit for is actually deductible or creditable, you would need to file an amended return for 2015 using Form 1040X.  You cannot just include it on your 2016 return.