We can divide doors in period houses into three categories; front doors, panelled doors and planked doors (which are typically ledged or ledged and braced).
Whereas the front door to the house was usually elaborate, the most basic doors were found outside at the rear of the house; the outdoor toilet (lavatory), entrance to the coal store, and out-buildings would have a simple door made from wooden planks joined with horizontal planks only (a 'ledged' door), or perhaps with diagonal braces as well (a 'ledged and braced' door).
These doors would normally be painted the same colour as the back door to the house.
The door furniture would also be basic - typically a black metal latch, and iron hinges.