- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 30 Jan 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.
Featured articles and news
Seven steps to defining a digital twin.
Achieving air tightness in buildings.
What are the benefits of smart homes for Millennial end-users?
How dynamic briefing can result in an efficient project.
Achieving sustainable roads funding in England.
Your chance to comment on the draft BS 851188 - flood resistance products and flood protection products.
Rebuilding could take 20 to 40 years.
RSHP’s high-rise residential towers win a tall buildings award for excellence.
BSRIA study reveals strong growth in 2018.
Dame Judith Hackitt confirmed as keynote speaker – one year on from the Hackitt Report.
Save £100 on tickets.
Modern slavery in the construction sector.
What to bear in mind when claiming damages in construction.
How do we achieve sustainable clean-water infrastructure for all?