Three synagogue congregations will be bought under one roof once a new development is completed.
Work has started building nine apartments in Stanmore Hill, along with a communal facility on the ground floor.
The ground floor will become the new home for Mosaic Reform, previously based in central Harrow, together with Mosaic Liberal and Mosaic Masorti.
Two of the community leaders, Rabbi Kathleen de Magtige Middleton from Mosaic Reform and Rabbi Rachel Benjamin from Mosaic Liberal, recently took part in a ceremony laying the first three bricks engraved with the words torah, service and good deeds, signifying the fundamentals upon which the principles of Judaism are built.
Mosaic Jewish Community was formed in 2014 and brought together three synagogues in northwest London.
Mosaic Reform, formerly Middlesex New Synagogue, built its previous home in Bessborough Road Harrow nearly 50 years ago, and Mosaic Liberal, formerly Harrow and Wembley Progressive Synagogue, moved in to share that building in 2010.
Mosaic Masorti, previously Hatch End Masorti Synagogue, operated out of the guide hut in Hatch End, and now looks forward to joining the rest of the Mosaic Jewish Community permanently under one roof.
Talking about the new development in Stanmore, Mosaic Reform chairman Harry Grant said: "This is a very exciting step forward for the whole Mosaic community and a really positive journey that we have set out upon. We have been looking for a new home for some time and our partnership with GRIGGS is making our dream to have a permanent home housing all three congregations become a reality.
"The new space in Stanmore, with sophisticated and complex sound-proof partitioning systems throughout, allows us to hold several services or other activities simultaneously, supported by very latest IT and other technology.
"The creation of Mosaic in 2014 was a unique step forward for Anglo Jewry, and building this new home is the next exciting step in servicing the needs of the local Jewish population, helping them ‘choose their Jewish life', and at the same time building ever closer links with the wider community in which we live."
James Craig, director of Radlett and Borehamwood-based property developer Griggs, said: "This is the first time we have ever worked on a project like this; it is completely unique.
"We know that Mosaic had been looking for a new home to accommodate all of their activities in one space for some time, and we are really pleased to be working with them to create this permanent home for them that will bring their community together."
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