I had a similiar situation quite recently so this is from experience rather than being informed in HR matters. I did seek outside advice as I thought it was a bit sinister but it's quite common.

Is the only change to your job title?

From your description , it seems to me that you already look after server room(s).

Looking after an additional server room isn't a change to terms and conditions if you still recieve the same salary and benefits. However, if hours, shifts etc. change, then it would be a change to terms and conditions.

It would be worth checking your contract to see if there is any information about required duties etc. Most of them are quite broad and not too specific when it comes to actual duties. If it states something like: "you are employed as a XXXX to maintain equipment in server room 1" then looking after 2 rooms would be a change.


Shanny