Never had to buy one mate, cost would be mega high

Not into it myself but could come useful if into a bit of file sharing

Funny enough we did do fibre termination when I was at brunel / city of bristol college.

 

The lecturers had a lucrative sideline training Avonline staff (at that time the business

division of the local cable TV co) so all the gear was already lying about.

 

Easy enough but does need a lot of practice and specialist test kit.

 

Deffo get someone else in job, but not rocket science all the same.

Avigalon do some decent Analog to IP converters but i think your trouble is going to be where are you going to pull all of the old camera cable to in order for them not to be disrupted by the demolition?

Fibre is definitely worth considering but if you've no experience I would also recommend getting a third party in to install,terminate and commission it for you.A fluid Mesh wireless network could also be of some use too,both pretty future proof.

Like Lwillis said , I would fit a cabinet and cat5 links to the new building . Video balun panels for rg59. It should be easy serviceable in case other CCTV technicians will come to look after in the future. And when the building is coming down you won't need a mains socket to be kept live.