(This is tangentially related to other topics and is here for completeness.)
Two Storey, Large, Conventional Design
Downstairs Upstairs
+----------------------- ---+---------+ +-----------------------------+---------+
| | | | | | |
| | | | | | |
| Kitchen | Heating | | | Bedroom | |
| and | and | | Bedroom | | Bedroom |
| Dining Storage | | | | |
| | | | +------- ---+ |
| | | | |
+------------- ---+------ +---------+ +---------------+ + +---------+
| | | | | | | |
| | | | | |
| | | | | | | Bath |
| | | Office | | | | and |
| | Hall | | | | Hall | Shower |
| Living Room | and | | | Bedroom | and | |
| | Stairs | | | | Stairs | |
| | +---------+ | | +---------+
| | | | | | | |
| Toilet | | | Toilet |
| | | | | | | |
+-------------------+--- ---+---------+ +-------------------+---------+---------+
Two Storey, Medium, Conventional Design
Downstairs Upstairs
+---------+---------+--- ---+ +---------+---------+---------+
| | | | | | | |
| | | | | | Heating | |
| | Toilet | | | | and | Bath |
| Office | | Kitchen | | Bedroom | Storage | and |
| | | | | | | Toilet |
| +--- ---+ | | +---+--- ---+ |
| | | |
+---------+ +--- ---+ +-----+ + +---------+
| | | | | | | |
| | Hall | | | | Hall | |
| Living | and | | | | and | |
| Room | Stairs | Dining | | Bedroom | Stairs | Bedroom |
| | | | | | | |
| | | | |
| | | | | | | |
+---------+--- ---+---------+ +---------+---------+---------+
Other designs pending.