Internal space
Internal space is a generic phrase to describe the space within an enclosed boundary (as opposed to a space outside of that boundary).
It might be used in association with any kind of contained space - or a container, where in might be more specifically referred to as internal volume. Effectively the height, by the width by the depth.
In terms of buildings internal space may be more likely referred to as interior space (as opposed to exterior space) with the boundary being the building envelope.
The measures associated with internal space might be floor space, useful or total useful floor area (UFA/ TUFA), Total rentable area, treated floor area (TFA) etc - for more information see Floor area. The space would then be that area multiplied by the internal height but it may be used as quite a generic term and the specifics of what is included in different contexts should be defined. For example an unheated garage or cellar in a house might be considered an internal space but is not part of the treated floor area, because these spaces are usually uninsulated, unheated or untreated.
[edit] Related articles on Designing Buildings
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
CIOB celebrates positive Ofsted report.
The Building Safety Regulator announces a call for evidence.
Government approach could undermine delivery and regeneration.
World's first mass timber data centre.
The overlooked environmental aspect of data centre development.
Introduction to radon awareness
New technical information sheet published by CIOB.
Updated supplier guide can help electrical contractors engage with NHP.
CIAT confirm the winners of the 2026 architectural technology awards.
Government launches a one stop shop for flood preparedness.
Sir Edwin Lutyens: Britain's greatest architect? Book review.
CIOB publishes free template to help assess and manage risks.
ECA's reflections on Party Conference season
Burnham wants to be confident of winning before asking for a fresh mandate.
New Chief Construction and Scientific Adviser
Sergio Cavalaro, Professor of Infrastructure Systems at Loughborough University.