Dear agarawal,
If your parents had left a will in favour of you then you have to apply in civil court for succesion certificate on the basis of will. After getting succession cetificate apply in muncipal corporation and other revenue authorities where property is listed for mutation.
1.In Nagar Nigam you have to pay no amount for mutation in UP.
2.some developing houses charges mutation charge @1% of property,s market value., but not in case of blood relation mutation.
3. In UP it is not mandatory to apply for probate but if your will is not registered then it will be a problematic situation for you to get asuccesion certificate.
4. In Some part of UP nagar nigam directly mutatae the property in your name on the basis of registered will.
5.If you will apply for succesiobn certificate there will be a nomonal court feees fro the procedure.
it will be better you go and enquire the bodies where your fathers property is registered.