Design for an expandable 20' wide Cottage

floor plan

20' Wide by 30' long This simple house is easy to build yet flexible enough to meet the needs of many owners for a one to three bedroom house. Read on...

Floorplan Notes:

  • 1. Refrigerator location - for a loft in the area over the bedroom and bath move the refrigerator towards the stove and install a ladder stair.

  • 2. Window wall - face this wall south for maximum solar gain. If the floor is slab on grade you can add up to 65SF of glass for a bright open interior and good use of passive solar heating. Windows can be ganged with transoms over standard height windows and sliding or french doors.

  • 3. Saddlebag closet - This hangs off the wall without any foundation. It has a simple shed roof and a 4' wide framed opening. Shelves are installed on the south wall of this mini dressing area.

  • 4. Storage - build in additional storage as needed.

  • 5. Porch - This wood decked and covered porch has a hip roof for use when the house has a steep gable roof and a wood floor raised a couple of steps above ground level. For a slab on grade house this could be a concrete patio with or without a roof over it.

Alternative Cross sections

These are only two of the several ways the house can be constructed by combining foundation and roof/upper floor choices.

Cross Section Notes:

  • A. This section represents the easiest to build version of the house. It has a single story. The south wall is 10' high allowing transom windows over standard windows and doors below. The north wall is 8' high. Perfect for a solar heated home or studio.

  • B. The roof can easily be built using lightweight 12" I-joists that have plenty of depth for good insulation. 2x6 extensions are added for rain and sun control (adjust overhang for climate and size windows to your solar mass using the Sunkit).

  • C. An insulated slab on grade floor provides for solar mass. This can be dyed and sealed for an inexpensive finished floor surface.

  • D. For more of a cottage look and a usable upper level loft, the house can be built with 10' sidewalls and a steep gable roof. This will give a very open and dramatic Great Room below. Another alternative is to built the cottage with 8' sidewalls and the site built truss roof  I diagrammed on the discussion board. This version would be another inexpensive one level house.

  • E. Floor and Foundation choices: - slab on grade can be built with either a turned down edge (for mild climates) or a floating slab inside a perimeter concrete foundation (for cold climates). For a wood floor you could use full-span 12" deep I-joists over a post and pier foundation or a perimeter concrete or pressure treated wood stem wall foundation.

Well, that's where the design is at for now. Expanded a bit the house also works with a full sized stair and a full 2nd story. With a couple of dormers above there is room for two bedrooms and a second bath. A three bedroom 2 bath farm house! But that project is for another day.


John Raabe, Country Plans LLC

email me: jraabe@whidbey.com

Visit my small home site: Countryplans.com

Discuss this house: CountryPlans discussion board

"Well building hath three conditions: commodity, firmness and delight"
Sir Henry Wooten, 17th Century English designer