Like all areas, every immigration seem to have different requirements, the below might be of use.
I renewed mine last year for the 10 year issue and although it can be done 'DIY', I always use a legal rep to make sure it is all done right on first visit, took us 1/2 an hour
[You must be registered and logged in to see this link.]Below answer to my question regarding residency
Q6: What changes have been made in regulations regarding application for long term residency? What Documents are now required for renewal?
There were no changes made to the European Union Citizens and Members of Their Families Entry and Residence in and Departure from the Republic of Bulgaria Act from March 2012.
Documents required by the migration department for the renewal of the residency card are:
- Your passport (original document + a copy) and you present residency card (original document + a copy)
- EHIC card OR a certificate from the Bulgarian National Health Insurance fund
- A receipt for the government tax