This is a description of the house we used to design and build.
The revised plan is a 16 X 24 timberframe plus loft, a 12 x 24 attachment on the north, a greywater greenhouse on the southeast corner and an upperdeck on the west with ramp down, if feasible. The north, underground walls are ICFs and the timberframe is closed in with framed and insulated 6" walls. Exterior finish is 2" foam with acrilic stucco and a standing seam metal roof for maximum fire protection and longevity. The frame sits on an insulated concrete slab with thickened edge with shallow frost protection. Pex for in-floor heating is in the slab, with a separate zone for the bath/utility area which contains all the water; interior walls are insulated so that in the case of long absence the rest of the house could be left to passive solar heating, only; in the first winter, this space kept above freezing in single digit weather for at least 10 days, the longest measured period. The exterior finish is stucco, with a metal roof, both for fire retardation.
The design maximizes passive solar and uses salvaged, but completely usable high-grade, low E windows and doors. The "front", south-facing wall has five 4'x7'windows on the main level and a 4' x 8' upper window to create a "mini great room," Many large windows give an outside feeling to the inside and maximize being in the woods. Work areas face outward. Awnings shade windows in summer, not winter.
A masonry heater is center-west on the main level, facing the "mini great room." The kitchen area is on the north/inside of this space. The west side is an office/lounge area looking out west and warmed by the back of the masonry heater. Ceilings (subfloor for upper levels) are aspen from trees on land.
The loft covers all but a few feet above the great room, and has gliding patio doors on the east and west. The east portion is sleeping area and looks out three ways. The western portion is for study, storage, dressing. The door opens onto a screened deck for viewing /being outdoors during bug season, with ramp down, if feasible. Inside walls between timbers are pine paneling except for sheetrock/tile in the bath.
The western portion of the attachment contains the stairs up and the walls are lined with shelves for books. The door on lower west side opens below deck to storage area / airlock. Wood storage/drying is in wood shop, a separate structure to the north which serves as a solar kiln and woodwork space. Some thought has gone into a barn that could hold an observatory.
The main, east door opens to an entryway / mud room in the greywater greenhouse, and will have solar heating. Heat storage is a large, black water bag on the north wall and by hot air blown from the peak through the insulated gravel layer below the growing/treatment beds. Some additional heat is provided by pex from the solar collectors that runs behind the water bag and under the growing beds; this is secondary to residential hot water storage in the utility room. The greywater greenhouse design uses the growing beds to treat domestic grey water from the house that runs to a 300 gallon tank below the greenhouse; the daily grey water--perhaps 30 gallons per day on average--is pumped into the root level of the growing beds. An additional 700 gallons--the second portion of the tank-- from cistern overflow is available if needed. Composting toilets keep septic materials separate.
Water for the house is collected from the roof into a 1500 gallon underground tank abutting the north wall. A pump and pressure tank from the cistern is in the utility room. The cistern includes a settlement tank, and water can be further filtered. Water is very adequate with mindful use. Overflow supplements the greenhouse cistern until full, or is diverted to drainage area.
Garden space is terraced north up from the entryway and may be fenced in. Minimal grassy areas are maintained around the house for fire protection. Bird feeding area and birdbath is south and viewable from most parts of the house.