Net Internal Floor Area Definition

Floor areas in property development can often cause a fair bit of confusion when do you use gross internal area when does the net apply and what about gross external area.

Net internal floor area definition.

The net floor area nfa of the private units in a residential condo building is typically 60 of the gross floor area gfa. The area of building measured externally at each floor level. Net floor area is the sum of the horizontal areas of the several rooms measured from the interior faces of the walls of each room. Gross external area and gross internal area areas with a headroom of less than 1 5m are excluded rather than included.

Gross internal area gia the floor area contained within the building measured to the internal face of the external walls. Gross internal area gia. Net internal area covers all of those areas that can be used for a particular purpose. The net internal area nia of a building is the usable area measured to the internal finish of the perimeter or party walls ignoring skirting boards at each floor level.

The area of a building measured to the internal face of the perimeter walls at each floor level. Net internal area nia or usable floor area ufa the nia is the gia less the floor areas taken up by lobbies enclosed machinery rooms on the roof stairs and escalators mechanical and electrical services lifts. The main definitions used within the code are. Areas are the foundation of a development appraisal and using the wrong area can cause significant changes in the profitability of a scheme.

Taking measurements from the internal finished surfaces of permanent internal walls and the internal finished surfaces of dominant portions of the permanent outer building walls. Net floor area does not include parking garages basements for storage or utilities common elements and common hallways. Net internal area nia. The whole floor net lettable area is calculated by.

Definitions the net lettable area of a building is the sum of its whole floor lettable areas. The floor area within the inside perimeter of the exterior walls of the building under consideration exclusive of vent shafts and courts without deduction for corridors stairways closets the. Gross external area gea. Net internal area is used for the measurement of industrial and warehouse buildings in some parts of the country.

For accurate benchmarking purposes nfa must be calculated using a consistent methodology. The agency hopes to be able to complete the substantial work.