As long as genuine part's are used then you can have it done anywhere. Though just be prepared if you ever do need to make a warrenty claim as from experience Renault will drag there heels and demand to see proof of everything.

As an example at work to validate a warrenty claim to get some rear door hinges done on a van, renault had us fax over copies of every invoice for every service carried out by the independant garage we use, at one stage they were going to throw out the warrent claim as one invoice didn't state what oil was used!!!