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Last edited 16 Dec 2019
Gross floor area GFA
The area of a building can be measured in a number of different ways, and it is very important to be clear about which measure is being used, for example in property sales, planning applications, building regulations applications, lease negotiations, rating valuations and so on.
The term 'gross floor area' (GFA) is a very confusing one that has different meanings around the world, and even within some countries.
Part L of the UK building regulations suggest that it is equivalent to the total useful floor area (TUFA), which is the '...total area of all enclosed spaces measured to the internal face of the external walls.'
For this reason it is clearer to use the terms:
- Gross internal area: The enclosed area of a building within the external walls taking each floor into account but excluding the thickness of the external walls.
- Gross external area: The whole area of the building, including external walls.
 Related articles on Designing Buildings Wiki
- Beneficial occupation.
- Case notes for rating valuation (Garton V Hunter).
- Choice of method for rating valuation.
- Contractor’s basis for rating valuation.
- Gross development area.
- Gross external area.
- Gross internal area.
- Gross site area.
- New rules of measurement.
- Net internal area.
- Profits method of rating valuation.
- Rating valuation.
- Rental method of rating valuation.
- Statutory formulae for rating valuation.
- Total useful floor area.
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