Building

The body.

Back door = rectum
Back garden = colon
Bathroom = liver, kidneys
Bedroom = reproductive system
Box at end of hallway = Uterus
Central Heating = heart, circulatory system
Cooker = stomach
Expel-air system = lungs
Fireplace = heart, circulatory system
Fridge = stomach
Front door = vagina
Garden path = colon
Garden shed = colon
Hallway = Uterus
Kitchen = digestion
Lawn = blood
Microwave = uterus
Oven = uterus
Roof, attic = brain
Room (small room at end of hallway) = Uterus
Sink unit = liver, kidneys
Stairs = spine
Toilet = elimination
Vacuum cleaner = lungs
Wash basin = liver, kidneys
Washing machine = stomach
Windows = eyes
Wiring = nervous system

If the dream draws attention to a physical structure or device the subject matter is an aspect of physical functioning. For example, a dream showing a fridge in bad repair indicates that the dreamer's stomach is in need of healing.