When house designs are priced they are calculated on the amount of exterior cladding, interior wall area, window area, structural support (beams), etc required. This means that a house design may have the same floor area as another but will be more expensive to build. For example, the modern monopitch roof style house design requires more exterior cladding on the higher parts of the walls, and the trusses are more expensive making this a more expensive look to build than a traditional hip roof house. Similarly, houses with numerous storage areas would be more expensive to build because each cupboard is made up of a number of components, such as framing, plastering, painting, doors, shelving, door handles and door stops.