4 Bedroomed house plan types usually fall in the range of 150 to 200m2 in plinth built up floor area. With average sized bedrooms, the floor plan will be in the 150m2 area range.
Laundry room.
Once a design moves past the 3 bedroomed floor plan range, the owner/developer usually also requires for other auxiliary rooms such as laundry rooms , TV rooms, 2nd living rooms and self contained bedrooms. Sometimes only the master bedroom has a bathroom, while other times all bedrooms are self contained depending on the needs and budget of the house owner.
Room sizes.
Once a house bedroom number increases past 3, this necessitates for larger room sizes since the house will most likely host many people inside. Thi living room size moves from the standard sizes to a minimum of 30m2 to accommodate. Same for kitchen and dining size. With the master bedroom en suite, this helps to offer use and assist the visitor toilet to ease the pressure in case several occupants want to use the toilet at the same time.
Roof.
The 4 bedroomed house plinth built up area of at least 200m2 for a bungalow is somehow wide. This makes the roof span quite wide, lifting the roof tip to ceiling height high enough to accommodate an attic space for extra room if need be. If there is no need for the attic room , the roof pitch can be designed to be less steep, say between 20 to 25 degrees, so that the roof tip to ceiling height is kept to at least 1.8meters high hence lower cost of roof trusses and roof surface cover.
Architect Francis Gichuhi Kamau.
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