The area is located east of Sandvika, west of Høvikodden and southwest of the population centre Blommenholm.
[1] In medieval times, Sjøholmen belonged to the farm Blommenholm, which in turn was a part of the estate Nesøygodset.
Jurist Carl Herman Halvorsen bought Blommenholm in the same year, and from 1876 he partitioned and sold parcels, mostly to town dwellers.
Halvorsen—who also served as mayor of Bærum—then sold the entire Blommenholm farm in 1898, except for Sjøholmen, where he moved into a newly erected Swiss-style villa.
[3] Sjøholmen is associated with boat transport, and the area is accessible by foot as a part of the so-called coastal pathway.