The layout of your home should acknowledge natural light, morning sun in your kitchen or your master bedroom, afternoon sun in your family room - whatever suits your preferences.
Your furniture and their preferred location have to be part of your design process, not just something you work out later.
Re-working the existing layout of your home and room use may allow for a more efficient layout without the need for costly additions or major alterations.
Your house doesn't need to be large in size. Comfort, function and character are often sacrificed with an oversized house, not to mention unnecessary cost.
Open plan design is currently very popular, however it should be balanced with the need for temperature control, acoustic and visual privacy. When these are important, closed in areas are more beneficial.
Spaces will generally feel more open and pleasant when you have windows on more than just one wall.