In my case, i live in a gated society which has 1300 flats. So BSNL approached the RWA to install fiber to all the houses. So they laid down their fiber cable to all the flats and they linked the society's intercom and CCTV on their network setup. No installation charge and monthly rental was charged to the residents only the basic broadband bill is charged+gst. So won't be able to advise you on installation charges. But i am sure there are people on this forum who have installed it via the normal process so they might be able to guide you. I would also suggest you to tweet them regarding the installation charges in your area, i am sure they will respond.