Hendon Reform Synagogue has postponed a vote on a merger with Edgware and District Reform Synagogue.
The shul's council had recommended union with the larger congregation as a "wonderful prospect" for the community, established in 1949. The vote was due to have taken place this Sunday.
But more time is being given to a group of Hendon members to explore the possibility of relocation further north-west, believed to be in the Mill Hill area.
The shul said the vote would now be held "after the summer".