We discovered that a double recliner sofa could be taken apart with a circular saw.
When we moved in the sofa was a bear to move because it was so heavy, but standing it on an end, we could snake it through the back door (after unsuccessfully attempting to take it through the front door, which is the same width as the garage door).
Over the years the back door got a screen door and the porch itself got screened with screen doors. The back door and porch screen doors are smaller even than the front door so we faced removing an entire window and then putting it back in. We decided to leave the sofa inside the house until one day my son flipped it on its face and it was pretty obvious how it could be cut into sections that were manageable through the doors and also light enough to carry fairly easily.