They can be a great investment for those who desire a practical layout, and access to natural light from the east side of the house. For a compact family home, a plot area of 30 x 40 feet yields approximately 1200 square feet of plot area. For a 30 x 40 house plan facing east, the number of bedrooms, a living room, kitchen, bathrooms, dining area and parking can vary depending on setbacks and the design requirements. Well-designed windows can also enhance the air flow and illumination of the house. The design concept should be based on the actual size and regulations in the site. Future extension, location of stairs, storage and circulation should also be taken into account in planning the house. A professional architect can help balance function, comfort, structure and homeowner's tastes in the available space.