IPMS 2023

Question 1

What is an External Wall?

Answer 1

The enclosing element of a Building, excluding appendages and ornamental features, which separates the interior area
from the exterior.

Question 2

What is an Internal Dominant Face?

Answer 2

The inside surface area comprising more than 50 per cent of the lowest 2.75 m measured vertically from the structural
floor surface, or to the ceiling if lower, for each Wall Section.

Question 3

What is an Internal Wall?

Answer 3

A full-height Wall within a Building that separates one interior area from another.

Question 4

What is IPMS 1?

Answer 4

The Floor Area measured to the external extent of the External Walls (and to any Notional Boundaries, External Floor Areas or Sheltered Areas.)

Question 5

What is a notional boundary?

Answer 5

A non-physical line that forms part or all of a Boundary and is typically agreed as part of the measurement instruction or
defined by a legal document.

Question 6

What is IPMS 2?

Answer 6

The Floor Area measured to the internal extent of the internal dominant face and to any Notional Boundaries and External Floor Areas.

Question 7

What is IPMS 3 for?

Answer 7

Exclusive Use Areas

Question 8

What is IPMS 3.1?

Answer 8

Exclusive Occupation External Measurement

The Floor Area available on an exclusive basis to an occupier measured externally to any Notional Boundaries , External Walls, Demising Walls and including any External Floor Areas,
Sheltered Areas and Secondary Areas.

Question 9

What is IPMS 3.2?

Answer 9

Exclusive Occupation Internal Measurement

The Floor Area available on an exclusive basis to an occupier measured internally to any Notional Boundaries, the Internal Dominant Face, Demising Walls and including any External Floor Areas , Sheltered Areas and Secondary Areas.

Question 10

Which are you using in practice?

Answer 10

IPMS 1 - Build Costs
IPMS 2 or 3.2 - Internal Dominant Face

Question 11

What is the difference between IPMS 1 and GEA?

Answer 11

Balconies and accessible rooftop terraces are included in IPMS 1 but excluded for GEA

Question 12

What is the difference between IPMS 2 and GIA?

Answer 12

IPMS 2 is measured to the internal extents of the internal dominant face (IDF) rather than to the internal face of the perimeter walls.

Question 13

What is the difference between IPMS 1&2 and IPMS 3?

Answer 13

IPMS 1 and IPMS 2 are external and internal measurements respectively for a whole or part of a building.

IPMS 3.1 and IPMS 3.2 are external and internal measurements respectively required for exclusive occupation.