Area Measurement Services (RICS Compliant)

Accurate RICS-compliant area measurement surveys for valuation, lease negotiation, development and asset management

Accurate area measurement is a vital step in the valuation, rating, leasing and marketing of property. At Technics, we provide professional gross internal area (GIA), net internal area (NIA) and gross external area surveys in accordance with the RICS Code of Measuring Practice.

Whether you require a net internal area survey for commercial leasing or a gross internal area measurement for development appraisal, our surveyors deliver precise, defensible data aligned to current RICS standards.

To find out more about how Technics can support your next project, call our team of experts on 01483 230 080 or email enquiries@technicsgroup.com

What is area measurement?

Area measurement is the means of determining the size of a building or plot of land, and is the starting point for any property negotiation.

It is essential for both parties to reach an agreement in advance on the basis for which the property in question will be measured. The Royal Institution of Chartered Surveyors (RICS) Code for Measurement Practice sets out a system of guidelines for area measurement to remove the potential for disputes at this important stage.

Two standard metrics are used in the measurement of area: gross internal area and net internal area.

RICS Code of Measuring Practice Explained

The RICS Code of Measuring Practice provides a standardised methodology for measuring floor areas across commercial and residential property. It defines: 

  • Gross Internal Area (GIA) 
  • Net Internal Area (NIA) 
  • Gross External Area (GEA) 

Using the RICS measurement code ensures that area calculations are transparent, consistent and defensible in legal, valuation and lease negotiations. 

Technics’ area measurement surveys follow current RICS guidance to ensure compliance and accuracy. 

What is gross internal area?

To calculate the gross internal area of a property, measurements are taken on each floor level, up to the internal perimeter walls. This can include:

  • Areas occupied by internal walls and partitions
  • Columns
  • Piers
  • Chimney breasts
  • Stairwells
  • Lift-wells
  • Vertical ducts
  • Other internal projections

Common exclusions to gross internal area include:

  • Open balconies and fire escapes
  • Minor canopies
  • Areas with less than 1.5m of headroom (other than underneath stairs)

Gross internal area measurement is commonly used for development appraisals and construction planning. 

What is Net Internal area?

Net internal area is the useable space within a building. Measurements are taken up to the internal face of the perimeter walls on each floor level – but crucially, only areas that can be used for a specific purpose are taken into account. Net internal area can include:

  • Perimeter skirting, moulding, or trunking
  • Built-in units or cupboards in useable areas
  • Kitchens
  • Entrance halls and corridors

Several factors are excluded from net internal area surveys, including:

  • Toilets
  • Plant rooms
  • Stair and lift wells
  • Any areas controlled by external authorities
  • Internal structural walls
  • Spaces occupied by permanent air conditioning, heating or cooling apparatus
  • Areas with less than 1.5m of head room (should be excluded and shown separately)

Why Choose Technics for Area Measurement?

  • RICS-compliant methodology 
  • Experienced surveyors 
  • Clear defensible reporting 
  • Commercial property expertise 
  • Nationwide service 
  • Integrated land and building survey capability 

Whether you require a gross internal area survey, net internal area measurement, or full building measurement services, Technics provides reliable and defensible results. 

Area Measurement Services Offered at Technics

If you require an accurate area measurement survey for valuation, leasing, planning or development purposes, speak to our surveying team today. At Technics, we offer a range of services around land, building and utility surveying. 

To find out more about our services and to discuss your requirements, please call our team of experts on 01483 230 080 or email enquiries@technicsgroup.com.