1. What all problems will arise if there is no OC/CC cert. ?
The authorities may not sanction OC hence the property is liable to legal action namely demolition etc.,
2. Approved plan is to have 4 floors and the builder has built an extra 5th floor which deviates from the approved plan, if I buy a flat in 3rd floor, will it be a problem?
Once there is a deviation, the authorities will decide to demolish and in that action if your third floor is also damaged what is your claim it against the authorities irresponsible attitude.
3. Most of the PS banks including SBI is issuing Loans on the property, I beileve this rules out the litigations involved in the site, please correct me if I am wrong.
The bankers go by the documents produced before it and not the physical verification to confirm deviation if any (owing to the gratitude received)
4. Why hasn't govt. made OC/CC cert. mandatory for registration, as its not mandatory for registration why will it be a problem to sell a flat without oc/cc?
Registration is different department and granting OC is by some other department which do not have any interconnection.
5. Flat's which obtain OC/CC cert. are being sold at higher price, close to 20lacs more than the one which doesn't possess Oc/CC, which I am not able to afford. Please advise.
If there is a risk involved give a second thought of buying it.
6. Builder has clearly told that if akrama-sakrama law to be enforced, All residents should pay the fines and get it regularised, and he is not responsible for it.
Now itself the builder is washing away his responsibilities then in the event of demolition by the competent authorities in the later stage the builder will not be available to give any answer or compensation to the loss suffered.
7.How problem is it to sell/mortgage such a flat in future? if banks are giving loans why cant they mortgage the same property?
It is the discretion of bank and it differs from one bank to another.
8. how to calculate the % deviation from the approved plan
Consult a local architect and get the details.