How long is a family reunification residence permit valid in Bulgaria?

Family members' permits are linked to the sponsor's status. The permit is granted to match the validity of your residence permit, but capped at a maximum of one year per issuance.

This means family permits are renewed in step with your own renewals. To avoid gaps, applications should be filed in good time; the official source notes that applications should be submitted not later than 14 days before the relevant term expires. Plan renewals early to keep the family's status continuous.