It does not look like the Causeway to me. At the time of the photos, 1898, this road was fully populated with the exception of the Vicarage Garden. The photo shows open field so is perhaps one of the lanes leading up to Denne Park, beyond the Causeway or Denne Road.
This view has changed little over the intervening years. The church, St Mary's, at the foot of the Causeway is Horsham's only grade I listed building. In the background there was a multistorey office block which has now been removed to be replaced with modern but fitting office blocks occupied by Royal & Sun Alliance.
Most of the church was demolished to make way for Royal & Sun Alliance to put up their offices. The church was 'relocated' to a site further out of town near Holbrook Primary School. This is the view from the Carfax.