See main article: 2018 Fed Cup Europe/Africa Zone. The play-offs of the 2018 Fed Cup Europe/Africa Zone Group I were the final stages of the Group I zonal competition involving teams from Europe and Africa. Using the positions determined in their pools, the fourteen teams faced off to determine their placing in the 2018 Fed Cup Europe/Africa Zone Group I. The top two teams advanced to World Group II play-offs, and the bottom two teams were relegated to the Europe/Africa Zone Group II.
| Placing | Pool A | Pool B | Pool C | Pool D |
|---|---|---|---|---|
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
The first placed teams of each pool were drawn in head-to-head rounds. The winner of each round advanced to the World Group II play-offs.
The runner-up teams from pools A and D, and B and C competed in order to establish which two teams would place joint fifth in the final standings and which two would place joint seventh.
The teams placing last in each pool competed to keep their place in the Europe/Africa Zone Group I. The bottom-placed team from group A faced the bottom-placed team from Group D, whilst Group B's and Group C's bottom-placed teams faced off. The losers were relegated to the 2019 Europe/Africa Zone Group II.
| Placing | Teams | ||
| Promoted/First | |||
| Third | |||
| Fifth | |||
| Seventh | |||
| Ninth | |||
| Eleventh | |||
| Relegated/Thirteenth | |||