Staff housing loan from private company 80c and 24(b)

Yes interest is deductible u/s 24b

Under section 24, one can claim the interest payments for the home loans taken from his company subject to the condition that one must submit the interest payment certificate. Without the certificate, income tax department will not accept the tax claim.
 

There is no deduction allowed under section 80C for the principal repayment to your company. Only interest repayment can be claimed fro the tax deduction. As far as the principal payments are concerned, they would not qualify for tax benefit as loans only from notified institutions and banks are eligible for such deductions.