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.'
However, in may countries gross floor area is taken to be the total enclosed space including 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 external area.
- Gross internal 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.
Featured articles and news
What is Modernism?
Modernist architecture and its many international variations explained.
BRE support Europe-wide strategic heating plans for local and national authorities.
Work set to begin on 'one of America's greatest parks', which will be 10 times bigger than Central Park.
One of our most popular articles - RSHP's Mike Davies writes about the concept design process.
As Cuba mourn the death of Castro, major renovation of this symbolic landmark may be a reflection of the country's fresh start.
How cannabis plants are used to create an alternative building material with plenty of advantages.
What does Mayor Sadiq Khan's first policy statement mean for London's infrastructure?
Bjarke Ingels Group announced as winners of design competition for new residential landmark in Amsterdam.
Designing Buildings Wiki has reviewed a well-designed and researched set of architecture city maps.
Designing Buildings Wiki attended the second annual Building Live conference, tackling the challenges facing construction.