Since 01/02/2016 (feb, 1), the indication of the counterparty’s BIC is no longer mandatory.

Here the list of IBAN prefixes (countries) of the SEPA zone:
AT
BE
BG
CH
CY
CZ
DE
DK
EE
ES
FI
FR
GB
GI
GR
HR
HU
IE
IS
IT
LI
LT
LU
LV
MC
MT
NL
NO
PL
PT
RO
SE
SI
SK
SM

Each transfer between those countries and with Euro as currency is processed as a SEPA transaction.
For the direct debits, it’s still recommended to use the BIC for countries outside the EEA (for instance, Switzerland).