Building A: parlour and hall - changes to house layout?

By looking at the cornice and doorframe (the architrave surrounds only the righthand side and top of the door), it appears that the hall of this property was a later addition, although was probably done quite soon after the construction of the house - it may even reflect rectification of a mistake made by the builder, or changes to the syle of house undertaken during construction. Beacuse...


...The cornice of the adjoining room is of the period. The unusual shape of the hallway: look at the door of the back room as it turns inwards at an angle:

And of the skirting at the outside corner of the room, and architraving around the arch, also give away this modification:

Floorboards also run through the hall and into the frontroom (parlour) - we would expect longitudinal boards or tiles in the hall (note also the floorboard stain in the parlour, and buff-coloured semi-grained stain of the hall):


It might be conjectured that this change perhaps indicates the desire to assert status by having a seperate parlour and hall, rather than entrance straight into this room, as commonly found within terraced houses in this area. However, it may as easily represent changes to layout by the builder during construction.